I Made This for a Truck. It’s for Emergencies.

in this video i'm going to attempt to build the most complicated over engineered jack ever made welcome back guys today is going to be really interesting because i have an engineering challenge and i need to select a jack for this service truck a hydraulic jack a scissor jack a trailer jack or a high lift jack this one uses a hydraulic ram to raise the arm you get a lot of power it's low profile works pretty good and then you have a scissor which uses the mechanical advantage of a screw turn the screw lifting action goes up pretty versatile you find them in just about every back seat of every vehicle then you have the straight push force screw style where you turn the handle and then you have a extension of two components this is for a trailer jack and then you have a high lift jack this uses a mechanical pin switching mechanism this is to grab underneath a bumper of a large vehicle you can pick something up that's sitting pretty high off the ground that's a big advantage to these and you can lift a long ways from floor all the way up to the top so i actually don't want to use any of these and i have my own idea on what i want to build for a jack so let me show you what i want to build how cool would it be if we added all the best features from these jacks and combined it into one i know i want the jack to lift really high so i'm going to be robbing parts from the high lift jack i really like the simplicity from the hydraulic lifting arm so let's add that into the mix too the trailer jack has a really cool telescopic feature that definitely has to be added in and i really like the handle style which makes it easy to use and operate so we'll incorporate that i also like the low profile of the scissor jack along with the screw design so let's add that into the pot and just in case there is an emergency on the side of the road it'd be nice to have a vise so we're gonna have to find some way to incorporate that and then to make the jack more useful i'd like to find a way to mount it to the back of a pickup truck this is going to make the vise way more usable and keeps it off the ground so now that we've talked about the design of the frankenstein jack what do i actually want it to do so here's my design parameters the jack has to be strong enough to lift a one-ton pickup truck to change its tires i'd like the overall weight of this jack to be around 40 pounds this is going to make it easy to move and store behind the seat of the truck the jack also has to be corrosion resistant because it might be out in the rain in the weather i'd like to set a target goal of 10 000 pounds for the crushing strength of the vice this is going to give me adequate clamping force on anything i want to put in the jaws on most pickup trucks i need 20 inches of height to change the tire so that's gonna set how high the jack can lift i have no idea if any of this is actually possible but there's only one way to find out and that's to actually build the thing to get started let's rob the feature from the trailer jack where it has two sliding components that go in and out this is going to make up the main body of the whole jack so everything is going to be built off that so let's get some parts cut for the main body i'm going to be using 3 by 3 square tubing and of course to keep it corrosion resistant i'm using stainless steel this is going to add some major problems a little bit later on that we're going to talk about we've got our two main body components of what's going to make up this jack of all trades four-part jack jack vice thing i don't know what this thing's called and remember this is the inspiration is this trailer jack where we want one tube slipping inside of the other and on our stainless steel tubing we have one problem we have a weld seam that is in our way yes i could source stainless steel seamless tubing in this diameter in this size but it's going to be really hard to get and very very very expensive the solution that i have i think we should cut a groove in the center of this to clear that ugly seam weld so let's go over to the acer mill and cut a groove in that okay test fit number one oh yes now that we have our tube sliding together nicely it's time to add some wheels which is a feature of the hydraulic jack now you're probably wondering why in the heck does a jack need wheels well let me show you it's pretty obvious that the wheels help slide the jack underneath the vehicle but that's not its main purpose when lifting from one side of the truck the truck rotates on an arc and in this case it's rotating counterclockwise which is exactly the opposite direction of the hydraulic jack arm which is rotating clockwise if the jack didn't have wheels the contact points where the truck and the jack meet they would slide and separate and the truck would fall down the wheels allow the jack to float with these opposing forces and stay in contact with the vehicle so without the wheels the swingarm design just wouldn't work for this project i'm choosing to use quarter inch stainless steel plate i'm going to be using this for all the tabs and brackets hopefully this keeps the weight down and is strong at the same time got my wheel brackets all cut out on the water jet but there's a huge problem with these the water jet does such a fantastic job of cutting them that it leaves a razor sharp edge on it i honestly think i could whittle wood with them that's just straight off the water jet that is so sharp so in order to solve that i'm going to chamfer every edge even the inside of this hole with this little tiny tool i know a lot of you guys asked me about it uses carbide inserts and it's basically a little router and we're going to put a nice smooth to the touch little chamfer on the edge of all the pieces and get with these things welded on i'll leave a link in the description below so i have these little tabs these are going to be holding the wheel in place since this whole system is stainless steel i'm going to be using some 308 tig wire these tabs are going to want to lift up just like that when i weld it so i have to make sure i clamp them down really well i'm going to be fighting distortion this whole time on this whole project so i have to keep the welds to a minimum so you're probably asking yourself what is weld distortion well in simple terms it's the force that the weld applies to the material when it cools and when a hot weld cools it shrinks and unfortunately i'm using stainless steel for this project and it is the worst with weld distortion the welds really like to pull causing my parts to go out of alignment wow look at it lift up already so let me flip it over see if i can get to come back i get asked a lot when i made these squares why did i make it have a complete 90 degree corner when i know people want to weld in a corner and this is interfering i'm gonna use it as a reference point to transfer this tab down to the bottom so if i butt this square right into that corner then this tab should theoretically be in the exact same spot and that's the beauty of this tool is that you can put 90 degree corners and have a room to weld right there or use it as a reference much like this no measuring required that looks nice nice it's now time to put some wheels on this frame but normal off-the-shelf wheels just won't work so we're going to have to make some that can stand up to the weight that we want to lift with this jack so let's go make some i'm choosing to use inch and a half solid stainless steel for the wheels this will also keep the wheel strong and keep the ground pressure to a minimum did a good job of getting our tabs welded on nice and straight our pin to hold the wheels in goes right through yes fred flintstone wheels the next feature we need to fabricate is the heavy duty lifting arm taken from the hydraulic jack it's going to rotate from the same hole that the wheel is mounted to i think making the arm out of the stainless steel plate is a great choice because stainless steel is pretty tough to bend a lot harder to bend than mild steel is i like water jet cutting the holes in stainless steel because drilling them out can be quite tricky every hole has a purpose and we'll talk about those as we move through the build so here's my arms i'm going to make that lifting jack with fresh off the water jet and all deburred and chamfered and in order to get these things lined up i've given myself little indicator tabs so these things should click together with a little bit of force and that will take some of the fixturing out for me when it doesn't fit get a bigger hammer we have to make sure it's welded strong enough to hold all the weight of a vehicle the other hard part if this bracket warps and the legs start to come in it will no longer saddle the tube so this thing has to stay pretty straight already warped it that looks good let's do a test fit this goes in there like that this pin look at that the holes line up that is so cool making a robot here well not really so now that this plate is captured with the pin it really can't push left can't push right so the body's adding the extra strength into this arm that it needs to add even more strength we need to make a lifting pad out here the lifting pad of the jack is a really important component it's what comes in contact with the vehicle distributing the pressure load across a much wider surface and preventing frame damage as you can tell it doesn't have any way to attach to the arm here so we're gonna have to fold it to get it to reach around the sides any steel that i want to keep strong i try to bend cold it just takes a lot more force to bend it does it line up look at that i want this lifting foot to remain parallel with the ground so i'm going to need to fabricate some sort of strut to keep it level this is where the weight gets tricky i really want it to be strong but i also want it to be lightweight so i'm going to push the limits here and try to make everything as light as possible we might have some bending when we go to try to pick the truck up take it look at what the water jet cut us some really cool control arms so it goes point up i hope these things are strong enough my calculations are correct it should just slide through now when we lift up this thing should stay flat look at that it's doing it hopefully they're strong enough we're gonna find out i'm going to lift the truck this jack is turning out awesome but i'd also like it to be a clamp so here's my plans on making that happen i'd like this clamp to look more like a vise so we need to fabricate some jaws that are offset from the main tube body i'd also like to incorporate some way to hold something round like a drive line or a drive shaft so we need to put some jaws in there for that too i'd like the jaws to be strong enough to maybe pull a bead off of a wheel putting something in the jaws and hitting it with a hammer and when i switch the jack to a high lift configuration they're going to be a really important component i need to weld these right there on the side and it's going to go and i also need to weld the dynamic jaw onto this side right there so let's work on the main body first get this sucker welded on we have our lifting arm here we've got our vise jaws here this is our sliding tube and it also needs a matching set of jaws which we have to weld on to this receiver tube so everything's turning out wonderful now it's time to work on the jaws and there's a problem with them is that they're smooth so let me show you my idea on how we can give these things some serious grip the obvious solution to get some more grip out of the jaws is to put a knurl in it a neural is basically a raised pattern in the metal making a tooth like structure and it can come in many forms you can get diagonal cross hatch but this time i'm going to try something original and do a spiral so i'd like to use this big gigantic washon lathe to make the spiral cut in this vise jaw i'm going to chuck it up in the four jaw chuck and hopefully i'm going to be able to cut some sort of spiral pattern into this block i'm not gonna be able to use any power feeds on this lathe to get the perfect spiral i'm gonna have to do it all by hand [Music] this is basically a interrupted cut and it's helping me get my timing right to turn the handle as the tool cuts the machine makes this really cool rhythm helping me advance the tool with every rotation it's kind of a feel thing that pattern is pretty wild i like the handmade rings you can tell they're not quite perfect but that just adds to the overall art of the knurl i like trying something new let's get our jaws fixtured and welded in i'm gonna use the shop shims the shims help me keep the distance between the two jaws perfect because i'm going to be adding something in between there later here's the pipe jaws that i talked about earlier grip a number of things these points in here these vise jaws and this lifting mechanism has no way of working without some sort of power transmission so let me show you my idea for that to lift a car and to operate the vise jaws i'm going to be using a screw this is the key component to the whole jack it has to work in compression and tension so selecting the right screw is really important if i choose the wrong thread pitch here this whole machine will not work so here's my choices these are off the shelf all thread this one is a one inch 14 threads per inch this is considered a fine thread which means i have to turn the handle 14 times to move one inch this is a coarse thread one inch this is an eight threads per inch and this is its stainless steel counterpart this is a acme thread five threads per inch this one's gonna move our mechanisms the fastest but we're going to lose some power this one's going to rotate way too many times but we're going to have the most power because the whole construction of this vise is stainless steel the obvious choice is to use the stainless steel thread when the threads interfere with each other when they get tight they can generate a lot of heat and creates what i call a galling effect i'm just asking for a disaster by using stainless steel i'm going to choose the steel one inch eight threads per inch if i get this wrong well we'll have to do it all over again but that's my pick so we know we're going to put a screw through the center of this tubing but we don't have any way to hold the screw on each end so i've watered it out some caps and pieces these are going to be what's going to hold this whole assembly together and make it to where i can repair the screw if need be what we got to do is drill and tap all the holes and then we'll come back when we go to weld them in this is the champion xlt tapper you can find it in the link in the description this flange has to be inside of this tube but it won't fit because of the weld so i got to make a little groove there so it'll go inside of there and then we'll weld it in place there we go with the back of the tube capped off with some nice mounting locations it's now time to look at the nut body every screw needs a nut and its position is really critical its location determines how far the vise can open up the nut needs to be positioned as close to the jaws as possible if it's too short this is really going to limit the travel the device can open up so the nut body and the screw need to match and be the same length so i'm going to be using just a regular heavy duty hex nut this is a grade eight and i'm going to extend it out from the back with this inch and a half piece of square tubing i've used round in the past but this time i'm going to use square because that's what i have this nut needs to be very square in line with this tube also we're gonna get some binding action so i'm just gonna square up the end with the belt grinder i'm gonna use it with these two pegs on the table and i know this is 90 degrees i know these pegs are 90 degrees so we have a quick milling operation that looks really square so let's weld it on there this nut is mild steel this tubing is stainless steel can you weld mild steel to stainless steel and the answer is yes but you have to make sure you use stainless steel wire if you tried to use mild steel to stainless steel you're gambling so this is the tube nut and this is going to slip inside of this piece of three inch but as you can tell it's floating in here there's nothing to attach it to i need to put something on the back like this flange and weld the end of that tubing to it and that way this tube nut is serviceable and we can replace it fix it do whatever we need to do this will also be a nice seal we could put some silicone around this and cap the end so moisture can't get in if this flange isn't welded absolutely perfect it will guide this tube in a weird direction therefore the screw won't be able to align properly i'm going to be fighting distortion and i have to weld this all the way around for strength i'm a little worried about this problem but we're gonna see how it fits i think the mega square here is gonna give me my best chance at success these two little tabs on the end here are going to help me hold this thing perfectly square in both directions that allows me to center up this tubing and then i can weld all the way around it while it still stays in the fixture these are the mantis grip pliers they have a short side and a long side keep this out of my way so i'm going to put the long side over there it gives me room to weld i'll leave a link in the description below where you guys can find these pliers now i have a little control of where this goes how am i going to get this flange in the center of this well i don't even need a measuring tape you can just use something like this three quarter three quarter on this side and i know it's three quarter on this side and just line it up with my finger just like that that is exactly in the center this is the swivel base plier as you can see it rotates around the hole giving me two inches of adjustment or this style i only have one point of contact to choose from see how it fits does it look like drum roll please [Music] that looks really really really centered by my eyeball and i had it calibrated last week look at that boom this is the part i tapped earlier and i need to get that welded right there so we've chosen the one inch eight threads per inch screw now i need to get it installed and find a way to turn it on the end so we need to make a handle that we can replace the screw on it later if necessary so for this screw i would like everything to be replaceable on it so just in case the threads wear out we can put a new one on so here's my idea on how we're going to do this i'm going to use a stainless steel nut this nut is going to be able to hold all the weight we want to transfer to it but we need a way to turn it with a handle so i'm going to add this piece onto the threads just like that and then i will weld the nut to this knob this gives me the option to grip onto this nut with a wrench or turn the screw with a handle now it's time to get the energy to transfer into the vise and i'd like to use a thrust bearing for that i would like to avoid metal to metal contact two metal parts that come together under pressure generate a lot of heat therefore friction and i'd like to avoid that so the best way to do that is to add a thrust bearing thrust bearings have balls that roll instead of metal to metal that slide reducing the friction and making it easier to turn and it just slips over the screw and butts up against that nut then we have a water jet cut plate steel that goes over the top of this and that's what that whole assembly pushes on but there's one problem to this when we turn the handle the side load of the screw is going to be touching this piece of plate steel so to prevent that extra friction we need to make a little machined pocket for this bearing to sit into i'm going to bore this out on the lathe and we're going to hold this square with the four jaw chuck so fast way to get center on this is we're just going to use the tail stock so let's start putting this together thrust bearing cap thrust bearings on the back side and then to hold that all together we need another nut spins good but we don't want this nut to back off so i'm going to add another one a jam nut let's get it installed and see how it looks look at that but this is completely inefficient we need to make ourselves a handle because this is a jack i'd like to put a jack handle on it instead of the traditional vise handle the vise handle would typically just be a straight rod we cut it off whatever length we want but the problem with this style handle is that when we go to store the vise behind the seat of a pickup truck this handle just always sticks out and it's in the way the jack handle is kind of unique it has a 90 degree turn on it so that when you go to store it look at that the handle kind of stores to the side and i'd like to copy this element and put it on this tool so for the handle on the jack i would like to use some wood instead of aluminum or steel and i have a pretty good assortment of hardwood here we could choose something like this purple heart maybe some marble wood if you guys remember this piece this is the red burl from big vice project could use some of that but i've been chomping at the bit to try out this this is a piece of snake wood one of the hardest woods i know of this thing's a tank i think it's gonna make a great handle if you've never seen snake wood before it has a really unique grain pattern i see it a lot in high-end knives so i know it's going to make a really good handle never drilled this wood before oh man it drills like steel so how hard is this snake wood let's compare it to some wood you're probably familiar with like red cedar it lands at 350 on the janka scale which is quite low black walnut falls at 1 000 on the janka scale and they use walnut and high-end furniture and snake wood has an impressive 3 800 janka rating that is really hard i didn't have a stainless steel nut to fasten the knob so i just turned one down on the lathe domed the top of it and cut some flats on the milling machine this way i can put a wrench on it [Music] that looks good i'm going all out on the handle and even the shaft is made out of stainless steel but i want to put that 90 degree bend in it just like the trailer jack has so i'm using my press because stainless steel is really hard to bend i'm gonna try to get to ten thousand pounds with this handle and i really hope that this doesn't bend back straight again i'm also pinning it in place that way the handle can never fall out or get lost if this bent handle doesn't work i'll definitely go back to the traditional straight vice handle so i have one more problem i like to solve and that is to get all the possible combinations of this jack to work so let me show you the solution i'd like to try to get every one of these vise styles or configurations to work i'm gonna need a key component and i'm gonna call it the drag link so when this link is added it transmits the vice movement into the lifting arm movement this is what makes lifting with a vise possible i'm choosing to make the drag link out of 2 by 2 square tube that's the same exact size we need to go into the trailer hitch got the drag link all drilled up and beveled for our clearance now i want to add a little gripper tab that's going to sit right here that i need to weld in next and this sucker will be done and we can try it out and i can show you how this drag link actually really works this is looking pretty epic i want to try it out but before i do i want to clean it all up i want to sand blast it get it looking pretty and then we can test it with the probe and see how this thing lifts in all the configurations [Music] [Music] this thing has turned out even more amazing than i can imagined i just love that satin finish on the stainless steel it rolls really really nice the handle is stored away perfect that way it's out of the way from behind the seat of a pickup truck but the next thing i want to do i tried to make this around 40 pounds so let's see if i came close we got a scale over here oh what she weigh 73 pounds oh i missed that one by a long shot we'll call this one the heavy duty model this jack is in the neutral or stored position let's pull the handle out now if we pull this pin and this pin what comes out is this drag link it looks like a two inch receiver tube that goes right here boom and now boom look at that got a vice on a truck there's a couple negatives i'm worried about is how well this handle holds its shape will it stay bent on me maybe you're probably wondering how in the heck are you going to open and close this vise fast well if you notice if you just make a circular motion around the pin that the handle opens this opens really fast vice versa remember we put the swivel on the handle so i can just grip it with my fingers it actually works really well it's a pretty good compromise from a traditional handle and then we want power we can come closer to 90 degrees and it's very unconventional but i think it's going to work how strong is it oh pretty strong will the tailgate open and not interfere yes works just like i planned it next thing i'd like to test are these serrated pipe jaws i want to see how well they hold this would simulate maybe needing to repair an axle hold your drive shaft i have no idea what you need this for i just thought i'd include it because well i can if anything one inch in smaller diameter the jaws will hold i might have to go back and revise that so it'll hold a one inch somewhere in there jaws hold that pretty good let's try something a little bit bigger let's try this piece of exhaust tubing it grips that good gotta be careful i'll just crush it so let's put a meter in between these jaws and see if it can make ten thousand pounds just to remember that this is kind of like the worst case scenario you might need a vice strain it on the side of the road somewhere at least you got it if you need it two thousand really easy to turn four thousand five thousand seven thousand am i gonna make it almost that's a lot yes i did it i met my goal ten thousand pounds is a lot for a vice that is really good news just with some of that quarter inch plate the jaws are strong enough my handle did not bend yes oh that makes me happy all right let's take it apart and let's try to lift the pickup truck over here and see if we can change a tire so this lifting arm has no way to move up and down by itself so let's put the drag link in now it's attached to the moving jaw put the wheels in because we know this thing has to roll all right so we know we have 10 000 pounds of screw force with this handle we're not gonna get that with this lifting arm so what i mean by that is look at this from this pin to this pin is only six inches and then from here to here it's a lot longer so we are losing force it's going to be close this may not lift the rear end of this one ton these little arms also might bend when we start pushing down on this pad so cross our fingers that these hold up so let's pretend i need to change this inside tire on the dually and i need to pick just these two wheels up so i'm going to pick up right on that chalk perch see if i can get them off the ground now remember i got to loosen the vise to go up okay i'm gonna go a little bit more but yes the tires are off the ground a lot of force that's probably the maximum i tried to lift in this configuration what surprised me was how much force and effort it took to lift just one tire up with this lifting arm i would probably save this feature for something or a car lightweight but what happens if we needed to pick up the whole rear end of this thing so let's convert it over to a hijack scenario and try to pick it up by this trailer hitch i think that's a good test so in order to get this to happen let's pull it all apart we're gonna stand it up this lifting arm which i'm surprised hasn't failed yet is gonna be the stabilization foot and it goes right there now this drag link is our lifting arm and it goes right here just like that and these little grippies give you an option not to slide off so you could use them to put on the bottom of the metal or come back over here and it kind of gives you a little bit of a stop as you can see in this configuration if the jack were to tilt or tip a little bit that this foot is going to stay in contact with the ground it's virtually a couple inches back from the end of the lifting arm but if you flip it this way now it binds up and now it's further past the end of this lifting arm basically extending out another three inches or so let's see if we can pick it up right through the receiver tube there we go oh this is really easy a lot of weight on there it looks like it's staying straight yes all four tires off the ground it's pretty stable though remember all that weight is on that one inch screw inside there and that's a long screw so this configuration worked wonderful except for this truck has a lot of suspension travel and i had to lift it quite a bit higher than i was expecting the ratio of the screw it was much easier to turn it felt like the jack was pretty stable and wasn't going to slip out the foot tilted a little bit which was good followed the path of the truck the curve would i want to use this jack in this configuration all the time no way but in a pinch it would absolutely work what i'd like to try next is to lift the front end up of this pickup truck it is much heavier than the back if we wanted to change a front wheel and tire i'm going to need a configuration of this jack that's going to give us the maximum lifting capacity so let's move it to a scissor jack configuration and let's try to lift the front end up the next thing we want to do is flip it over onto its top open up the vise all the way up put a wheel on the end just like that that pin there and these two arms go back here this pad goes here and now we have a lifting jack come on little jackie poo so let me explain to you how this scissor configuration actually works as you can see i have a roller wheel on this end and what happens is when i turn the jack in everything starts to erect up and then stays anchored on this jaw in the front and this allows this whole assembly to slide and glide easily up now as you can notice this is not fixed in one position and what happens is this is going to find a neutral position on the mounting point on the frame of the pickup truck let's cross our fingers we have enough power to lift the whole front end of this truck up yes we did it it's up now that is just cool everything looks okay except for my little control arms here they are bending quite a bit there's a lot of weight on those arms so this might be a potential design flaw but we don't know until we test it so let's bring it back down and check out the damage definitely bent it so i have two solutions to solve this bending arm problem the first one is i've made this new foot this new foot now puts this arm in tension instead of compression by swiveling it around this pin so when the load gets pushed down over here it pulls these rods tight we lose a little bit of reach but i think it's a great solution to the problem i don't really like the way it looks i like the way this one looks better but it compromises the other way we could fix it is just by going with shear mass this is two arms doubled up with a spacer in the middle of it this is basically going to double the capacity this thing can hold it's now three quarters of an inch thick this is heavy and especially when you add two on each side you're just making this thing even heavier than already is but those are two solutions to this problem what do you guys think we should name this thing please leave that in the comments below also i'd like to know your ideas if you'd like to build your own jack vice i'm going to leave the plans and the dxf files on the fireball tool website so find them there and i will see you guys on the next one so thanks for watching

Channel: Fireball Tool

Views: 2,554,795

Keywords: fireball, tool, Fireball tool, Welding, scissor jack, hydraulic jack, high lift jack, trailer jack, vise, hardtail, lathe, hwacheon, TIG, 308 wire, knurl, stainless steel, animation, frankenstein, drag link, waterjet, mach 500, prototype, CAD, dodge ram, truck hitch, vise for truck, best jack for truck, slow motion, phantom camera

Id: p36lgh073OQ

Length: 34min 27sec (2067 seconds)

Published: Sat Mar 26 2022

Reddit Comments

[u/SnakeBeardTheGreat]

What I want to know is where are you supposed to store this big hunk of metal in your truck?

How is my 5" 115 lb> wife going to use it?

[u/sturmey]

wouldn't it be safer to use the jack that came with the truck? Also, wouldn't mounting a vise on a receiver be faster, cheaper, and better? For what he spent in materials he could buy a hi-lift farm jack, a vise, and still have money left over for a keg to celebrate the fact that he has a vise and a jack.

This is a solution that isn't needed.

[u/forkandbowl]

He does some good shit. I bought the Allen wrench set and holder from him and they are fucking fantastic and cheap considering the Allen wrenches you get with them.

[u/sharpened_]

Brilliant bit of design work to get it to perform all of those functions as one unit. I wish he had an extension to drive the main screw, that way he's not under the vehicle trying to raise and lower it.

To echo someone else, I wish that he had shown more of the design and layout process, that's what I really want to learn more about! Damn cool project though.

[u/Potatobobthecat]

It’s a cool concept but……70lbs and being that bulky isn’t gonna work. I think the Hilift jack and vise hitch mounted could work.

[u/MickRaider]

Honestly this thing terrifies me. It's a cool concept but he didn't appear to do any engineering calculation or simulations to verify the rating on the equipment. It clearly works but who knows what the safety factor is.

[u/paul_miner]

Fireball Tool designs and builds a vise that mounts into a trailer hitch receiver, and can also be used as a floor jack, a hi-lift jack, or a scissor jack by moving a few key pins around.