Marvel Band Saw: Replacing Worn Out Feed Worm Gears

[Music] hello keith rock here at vince machinery.org guys uh today back to working on my new marvel saw i probably saw a little video we did earlier where i had brought this into shop and we did some rewiring of the motor to get it where it would switch over from 440 volts to 220 volts three-phase which is what i have here had to move some wiring around and so forth to do that since then i did kind of off camera come in here and take some of this stuff apart to try to figure out a problem that we were having so basically the way this saw works is when you turn it on the blade turns and basically the whole carriage will feed across the work that you're doing you'll clamp the work to the table there's some vices that go on here i've got them off right now i do have those pieces and the blade just moves across and and cuts your your metal it's a really really handy tool i'm really excited to have this in the shop but my feed mechanism wasn't working there's a basically a power takeoff shaft that comes from the back of the machine from the motor see if i keep from throwing it on the floor and it engages into a little worm gear setup up here in the front and that is basically what drives and pulls that into the saw and we had multiple issues going on up here that we had to resolve so let me show you what the problems were and we're going to put this thing back together and hopefully get her back to work and so up in the front of the saw there's the shaft that comes out and when this shaft turns basically it feeds that whole bandsaw head across there's a chain in there that's on track and and again as it turns it it moves across and there's a worm gear and a worm so there's a gear and a worm that mount on this and and that goes to this uh power takeoff shaft we were talking about a minute ago and that's what basically turns all that so we had two two big problems so first off on the power takeoff shaft we had this piece here on the front that basically this shaft just turns in this is a a bearing surface and this thing was froze up i mean it would not turn it was it took a good bit of force for me to get it free it was just rust and crud up in there once i got it out and cleaned it up it's fine but that thing was just froze solid looks like someone had not been oiling it along the way and then the other problem that we had let me get that out of the way is the worm the worm gear itself so this is the original one and this is a new one that i got and you can see this is just worn out let me zoom in a little bit closer so you can see that so this is the one that was on here originally and this is the new one and over half of these teeth were just they've been stripped out and the worm that was driving it it also had some wear in it as well it just i mean it just it wouldn't hardly grab this new one that we've got i mean it is a positive engagement in there so undoubtedly this thing was really slipping a lot and probably why they had disconnected uh the belt back there and weren't even using this and probably why that front part froze up but we got a new worm and worm gear i was able to order these parts they were expensive i think the two pieces here about 350 which is about what i got in the whole saw but this is what we need to get it fixed so i was glad to be able to find those parts and be able to do them so we're gonna put all this back together and hopefully get this thing back up and going so while i had all these parts off i cleaned everything up real good this stuff was full of gunk and grime and what have you first thing i'm going to do is put the little counterweight back on this just swings on here and uh there's a weight kind of like an old scale and when the more you put on here that's the pounds of force that is footing and basically it's just a it's a lever and it's pushing up on this piece down here which engages that worm into it and when you go down the other end it basically takes all the pressure off of that shaft so get that back on there i'm gonna get me a little drop of oil and put down in there make sure that thing stays oiled real good here we go the next thing i need to do is get our worm gear back on and i know this thing's going to be a little bit aggravating this uh shaft has a little bit of a bend in it i actually straightened it out it looks like someone had bumped this thing with a forklift or something and i'd straightened it out before i pulled it off it's not perfectly straight and it's probably going to give me a little bit of a trouble going back on but i think we can get it slides on to about right there and there's a flat in there that a set screw tightens on i'm going to get a little something over there that i can slide over that shaft to see if i can just bump that right up on there let me see if i can find something well i was looking for a piece of thick wall tubing or something but i couldn't find anything but um i've got this little uh tap driver i think this will work and see we can just knock that right on there it's going without too much force and once it gets over that little notch it just goes right on there so that's good and let me get that set screw and tighten that back in there see i think that was the one that was in there i'm gonna go see if i got a fresh one that one's just full of gunk and make sure i got good threads here's the original set screw i just went over and got a brand new one that same size go ahead and swap them out i'm sure that old one would work fine but i got a new one this one's got nice clean good threads on it might as well um put it in there that's going to tighten up on that flat this milled in that shaft and that should be perfect all right so this is the new worm this is the old one and um i honestly probably could have gotten by with the original one you can tell there's a little bit of wear on the leading edge of that word engaged in that in the worm gear down there but hey we're just going to go ahead and swap them out put a fresh one in there while we're doing this also you could you probably can't see it on video but it's actually you can see that radius in there where it's kind of worn in the center to match that gear down below but this is still the the actual worm gear down there is bronze the worm gear is designed to wear before this does but uh yeah we're just going to go ahead and swap them out since i've got the parts so this just goes up on the shaft and you can see there's a hole there for the set screw to go into and again i have got a new set screw here making sure we got good fresh stuff get the right allen wrench here and we'll drop that right down into that hole and that'll lock that into place very good on the other end of the machine now this is uh where the belt will power this power take off and there's a pulley here that mounts to that it's kind of interesting there's little wooden dowels in here that come in contact with this plate here that's just a friction and there's a bushing that fits up inside of here so we're gonna go ahead and put this on the uh belt's kind of got to go all on it here at one time all right that's better let me get a couple of get my bolts and put that in there weren't any uh lock washers or anything like that under these these in fact you can see up here there wasn't any on that either you can actually see the impression from the hex head coming in contact in there so i'm just going to put it on the same way it came out somebody'll probably say oh you need a lock washer in there but that's not the way it came from the factory so we're just going to put it back together this way there we go i think that's back together so back on the other end now you can see the worm and the gear meshing with one another we're also tied into this little weight system here and next part is we need to put the little piece in the front that basically just moves this shaft up and down to engage and disengage the worm i'll show you how that works up here on the very front we got a little piece that fits in here this is actually the shaft or the the bearing that supports this piece here there's a little order on there this is the part that was frozen up there's a shoulder bolt that goes in right here that it pivots on but on the back side of this there's a linkage that goes between this pin in the machine and this little pin here notice we got a little cam shaped uh our cam operation on that on the front right here and when you turn this handle basically what it's going to do is it's going to cause us to pivot up and down and move that worm in or out disengage and engage it there so that's how this all works so first things first i'm going to really put some oil on that right there make sure we got good lubrication in there and i'm going to put my pin on this one we'll slide that in there put our pin on the back side here at the same time and get our shoulder bolt aligned that feels like it's going right there and you can see the action all right let me tighten this shoulder bolt up so now there's a cover that goes over all this just to protect stuff like such and uh got some socket cap screws that go in to fit this to i was going to replace these cap screws i went over there and got new ones but look the heads are bigger on the new ones they won't quite go down in there i noticed these heads were a little bit smaller ah we'll just use the old ones there's nothing really wrong with them uh let's see now this cover serves a couple rolls number one is to protect that gear keep your fingers out of it make sure no trash gets in there but there's also a little well down here in the bottom there's an oil cup here on the side and what that does is that allow that basically keeps all this lubricated so when that gear comes around to the bottom it dips into that and keeps everything lubricated so we're going to start by just kind of filling that reservoir up down in the bottom and i'm just bypassing the cup here but uh that should be a good start and next we have a hand wheel that fits up on the shaft that allows you to turn this by hand but uh when i got this this saw notice this little knob it was laying over in the in the front of the machine like i said i think someone bumped this with a forklift they bent this shaft which i straightened out earlier off camera but the knob was gone i was fortunately able to get a pair of pliers and pull that little stub out that was in there just pressed in and uh thanks to my good friends of my master car one new handle made in usa this is a type that turns it's got bearings in it and it just presses in that hole i'm gonna go over to the arbor press press that in and we'll be ready to put this back on all right our knobs pressed in there just went over the arbor press push it in real easy and we're ready to install this so there's a woodruff key slot right here that we're going to put on first we will slide our handle up onto that slot like such roll it over 180 degrees and on the other side there's a slot in that shaft just like before for a set screw and i got a brand new set screw we're going to put in here and tighten that on there all right and look at there slick a snot all right so now we can easily move our head back and forth with the crank on the side still got just a little bit of wobble in it from where that shaft was being i can feel it but it's not near as bad as it was that's that worm gear catching that's how deep this saw will cut all the way up there and when this machine is running and you engage the worm it's going to automatically feed that across all right let's uh get our vice put on here and uh we'll be ready to try this thing out there are two clamps that mount on the table that the uh that actually holds that vice in place where you can move it around and i noticed when i was taken apart that they were really stiff getting the the screws out so i'm just running a tap down i'm gonna run down both of these just to clean those threads out make sure we got good threads and i felt it cutting a little bit i think it was mostly just chips and trash and i think some of those threads might have been just slightly deformed so that should freshen up it's three-quarter inch tin the other thing i'm going to look for here is there's an oil cap right here the oil caps are gone let me see i may have a couple of oil caps that i can press in there let me look and see let's start by seeing that we can get this old cap out i believe that's just to press in may be threaded no it's a press in and i have an assortment of little oil caps over here and look there that one fits just fine tap that down in there problem is i've only got one of those i'm gonna need two of them i'll have to order one but you can get a master car i'll order a couple of spares while i'm getting them and i like to keep some of these on hand because you run into those all the time and like i said you can pick them up at my master car so next up we need to get our uh vice mounted on here this has an adjustable vise that you can basically set anywhere up on here you want to it's got a front and a back that adjusts in the slot or you can take it completely off you can use these slots as t-slots and just bolt something straight down the table so you got a big plate or something you need to put on here no big deal so this is the piece that goes down into the t-slot there's actually on either side of this there's little notches in here that a little square diamond shaped piece clicks into and uh there's this little spring-loaded piece on the back that you can push down on and when you do it allows you to kind of adjust this wherever you want it uh once the springs kind of get in there it um it just kind of you can move it by pushing down that spring so anyway we're going to set this we'll go ahead and set that on top of it and you know that's about where i want it right there kind of at the back end of that stroke tell you what to get the maximum depth of cut here we're going to clamp it right there okay and then i just take this set screw on the front and it just clamps down onto this and basically sandwiches it all together so we're going to put it right there this side is what you would consider the fixed side and when i say fixed side i mean basically it's going to stay fixed most of the time but you can move it if you need to you just come in here and adjust it but this one requires a set screw to do that and let's get ahead and get it clamped down it's moving forward a little bit i see what's going to happen it's going to jam between the back and the front here so before it does i want to kind of move this thing back again that appears to be clamping down it has this miter on this side you can put these these uh device on the other side if you want to when i got this they were actually on the other side but this is the side that they should be on and it should be square based on the t-slot so i'll probably get a a square or something coming here and just make sure those are exactly square i'll do that a little bit i'm just want to get it on here and try it out right now we'll check all that stuff out in a little bit all right back when it's on let's put the front one on the same thing here we'll come in with our [Applause] little clamp piece and we will put our jaw on here and on this side instead of having a set screw it actually has a crank that uh you can easily adjust without having to get a set screw out i'll put a little drop of oil on that [Music] and i think what i want to do is get a piece of metal and uh let's see if this will cut i've got the blade that was on it when i got it i don't know how good this blade is but it looks like it's all right so we'll try it out let me get a piece of metal seam 32 all right we've got a little block of just going to cut a little disk off of that tighten this up let's uh see what happens moment of truth i did move my guides up here just a little bit to clear one thing i will notice you can flip these around put the front jaw on the back and the back on the front and at that 45 degree angle and be able to lower your guides down a little bit lower or if you move the vise on this side you want the 45s on there because the whole head will tilt back to 45 degrees so that gives you the clearance there but anyway let's try this thing out there it goes look at it slice and we're coming out the other side here there we go there is some stops over there on the other side that uh you cannot do it where it will automatically uh shut the saw off when it gets to a certain point i don't have them adjusted out right now but if you're doing a bunch of repetitive cutting you can make it soon as it comes through there just shuts the saw off but there you go made easy work out of that next thing i need to do is this machine does have coolant in it i need to see if that coolant pump's working and maybe see if we can get all that going as well but good news is we got her fixed we got her working well there we go one more job checked off the list and with that i have another new tool that we can use in the shop this is a machine i think i've said this already this is a machine that i've been wanting for a really long time really like these uh these these marble saws i know several people that have them i've been on the lookout one for one for quite some time i saw this one come up in an auction up in tennessee a couple weeks ago and i bid on it won it got a pretty good deal and uh real happy to have it in the shop uh and you know anytime you buy something at auction you're always you know am i buying a piece of junk is it gonna work is you know there any problems with it and yes we did have a few problems with it when we got it but nothing that couldn't be fixed with just a few little mechanical things and yeah it cost me a little bit extra money but when all is said and done when i look at the auction price the auction fees the tax the puc the parts that i had to buy to put on this thing i've got less than 800 dollars in this thing that's a steal any day of the week and again it adds a lot of capability to my shop this has been something i've been needing for a long time so glad to have it and now the big question is is do i keep my do all bandsaw and this one or do i get rid of the do-all now that i have this one really the do-all is more for free hand cutting than cross cutting yeah i'd really like to put this saw there where the duals at and save the room but at the same time that do-all is just a handy thing i got to think about that got to think about that might have to rearrange back there again see if i can make room for both but there we go check that off the list repair is done tool's ready to go uh the saw blade that was on here appears to be cutting good uh i'm gonna go ahead and order me an extra blade or two just so that i have some when they uh when i need them i leaned over and hit my emergency stop button i thought i'd go ahead and click that off i didn't wonder why it wasn't turning on next time i went to use it but um all's good and with that that'll be a wrap as always guys thanks for watching please uh subscribe to the channel if you haven't already thumbs up comments are appreciated uh hit that bell icon to get notifications and i'll catch you on the next video again thanks for watching [Music] you

Channel: Keith Rucker - VintageMachinery.org

Views: 48,421

Rating: 4.9765625 out of 5

Keywords: Machine Shop, Machinist, Restoration, Vintage Machinery, Georgia Museum of Agriculture, Metalworking, Keith Rucker, VintageMachinery.org, band saw, marvel saw, armstrong and blum, worm gear

Id: eXY8qNN80lU

Length: 24min 41sec (1481 seconds)

Published: Fri Sep 03 2021