Knurling and a Few Things you Should Know

hey guys go find here advance innovations welcome back to the shop you know I have to start this video by saying congratulations to my youngest daughter Victoria who just made first lieutenant in the United States Air Force way to go baby I am very proud of you anyway today's topic is going to be gnarly gnarly not an insulated to something that I've never really enjoyed it's not like you're going to stand in one spot for your whole career and just run URLs and get so good at it that you can find it you're a wizard I personally am NOT but I do know a lot about it and what I know I will share with you a neural is a cold form high-pressure operation of putting a pattern on a piece of round stock you can have a cut knurl like a CNC we use and they produce a fantastic almost meticulously perfect neural every time or scissor type clamp type straddle type swivel head type knurling tool holders for an insulated operation to do it the old-fashioned way like most of us are going to do there are two types of knurls that i've come across what is called a DP neural which is a diametral pitch neural and those DP neurons are specifically engineered to give you a repeatable track on a diameter that's fractionally divisible and if you look up DP nose I can stay in here Clark for 15 minutes about VP girls but look them up and it will give you the number of the neural versus how many or what the diameter is supposed to be in order to get a successful try for a DP neural ok another neural type is called a TPI and that's T per inch it's just like threads per inch teeth per inch so if it's a 16 TPI neural you're going to get 16 teeth per circumferential inch and if you don't know how to figure out the circumference of your workpiece zoom in on this sometime and check that out so its diameter times pi equals or circumference that's no big deal the types of knurling profiles that there are you have a square wheel which just like a tired it's just there's no there's no crown to it there's no beat to it it's square and a square profile neural is good for a single location crushing operation it is not good for a traversing operation where you need to run a long neural on like a hammer handle or screwdriver Handler or some other feature anyway don't use a square corner if you have to do that if you do have to do it you can get a beveled edge knurl which looks exactly the same as the square corner but it's got a little 45 degree chamfer on either side or a 60 degree chamfer and that takes some of the load off of the toothed edge now does it take the load off the knurl it actually increases the moving pressure because now it's a blood base instead of a square base but the chances of chipping the edges of the wheel off are reduced now the ideal neural to use if you're going to traverse a long piece is called a convex neural and it looks just like a tire so you can imagine that the round profile allows the knurled material to enter a light and then increase the pressure because of the crowd with neural and exit however a convex neural will not give you a nice sharp to the edge neural if you're knowing between two very specific points you're going to get a little bit of a run-out and if you can deal with that then by all means get yourself a convex neural it is absolutely by far the premier choice for running a traversing girl on on anything holders you have a multiple of different holders or sub holders that actually hold six wheels so you can have a fine medium and of course set up at all times and I believe that's called a swivel head neural some swivel head nurdles also only have two wheels so they're self aligning they do pivot and you just run it up against your part when the top wheel hits the bottom wheel comes and kicks and everything is good but it's a straight in kind of neuron there's substantial pressure on your part to deflect there are other neural holders that don't do that and one of them is called a scissor neuro which is awesome and it's a it's a gnarly tool that looks like this and here's the wheels and as you tighten down the adjuster it squeezes the poor nice and tight and you can adjust where the wheels hit so you're not pushing the part away from you the operator you're more like squeezing it from the top and the bottom and that's what I'm going to run for you today out of the shop I'm going to give you a practical demonstration on a scissor girl with a 16 TPI unfortunately it's a square corner I don't like square corner girls but I'm just going to start lighting some diameters and let's see what happens okay the swivel head normal is the one that bounces around and finds its own Center the scissor girl you can adjust the height of it and you can adjust the projection of it the wheels you do not want the wheels to be beyond Center when you set your knurling up let's say we're looking down from the tailstock that you're part here's your part you want your wheels to be somewhat behind center of the part you don't want it to be too far behind because then it has a tendency to reject the part squeeze it out you want it to be as close to the center as you can get without being beyond Center because then when you apply the pressure to it it just wants to walk away so when you position your neural keep the axles or the actives of the knurling wheels behind the center of the park it's going to serve you well and it won't give you much eggs a straddle barrel is just like a vise it's just like a little miniature vise it's very linear the wheels are in line choosing on a much more stout block and as you tighten down under the wheels just come together hopefully at the same time I don't know how to use too many strapping girls but I know they exist and they're bar popular so if you have one auto means the types of wheels that they have left and right if you're running a diamond pattern narrow and work you want a diamond pattern neural on your part you're going to have to have a less than or running wheel if you're using a two-wheel knurl they do actually sell one wheel knurls that have the whole diamond pattern right in it and they do not recommend using two of those if you have or a straddle type holder patterns straight tooth pattern like a letter diamond tooth pattern simple actually there's one other pattern that I recently saw on a channel click spring click spring and it was a rope knurl so it looked like a piece of rope that was bent around a part it was done on a positive protrusion in brass I believe it was and the guy actually made the neuro before he ran the neural on the part so go check out clique spring this guy's making a brass clock it's about yo big amazing craftsman this guy so go check out his channel oh so that's about it you can have diamond straight and rope knurl base for the hook spring left and right wheels you have a full pattern wheel pressure of the wheels but wider the wheel is the more pressure is going to take to penetrate your material so if you're running up neuro on a harder material you might consider a thinner wheel or definitely a convex wheel to run that neural they have internal normals if you've blown the boron hole or you want to resize something that stands for a press fit or a new bearing or whatever they have internal neural summer real small somewhere on the end of a boring bar and you just run it in and press it up against your board down you go and it just displaces material now you have something to work with one of the techniques that I use when I run a neural is I bite the material real hard on the very first initial contact run it real slow in one revolution and look for my repeatable pattern if you have a cross tracking pattern or a double tracking pattern you're going to find people that fall at 99 different things I know spotty because I just watched a video recently of a guy with over a million subscribers and I'm not going to use this that's as much information I'm going to give you and I was watching and wrote a neural and it was a very coarse neural I like coarse neural for demonstrations because they're easier to see and you're they're easier to tell if you have a mistake and on the part when he got his neural powder back he had twice as many peed on the part as he did on the knurl you know if that was the desired effect and you're okay with that I mean it's a good way to get a medium grade knurl out of a very coarse wheel or under a lot of obedient wheel whatever but you want to see the exact same pattern on your part as you do on your wheel if not that just means as the diameter of the material comes back around the groove is in between the teeth of the roller that's forming the grooves so it's they're just not timed correctly they're not hitting in the right in the right spot and I would have to think as well if you're using a scissor type knurl the timing of the top and bottom wheel and I never really gave us much thought until just this moment the timing of the top and bottom wheel is the top roof now it's because one's the left and ones are right right just check okay ultra you don't want to see this if you see this chances are the diameter of your material is not sized correctly and I'm not a big fan of this hole sizing the diameter correctly but there is some validity to it and that's where this little equation up here comes in if you look at it should a quarter diameter material times the mathematical PI value of 3.14159 and it goes on forever but 3.1415 is fun you come up with a specific circumference measurement if you're using a specific PPI knurl and you know 16 TPI would be Oh 60 to five per tooth if you can't divide your tooth value into your circumference evenly the chances of you having a successful neural not going to say it's impossible but it's going to be greatly reduced so for an issue the core material you're going to have 62.83 teeth per diameter now how sensitive is it if you take 7 thousandths of an inch off that 1.25 Oh take it down to one point 243 you'll have the exactly 63 so 7 thousandths of an inch difference in diameter just saying if you take that good strong button penetrate those teeth you're probably into that material set it down so the chances are they're running a good track on the first try are pretty good and we're going to we are going to find out because I'm going to do this in stages on the way that I'm going to prove whether or not this works and how many times it works repeatedly or not it probably won't be my luck it probably won't okay if you run a long neural on a part don't sit at the end of the neural because the more the neural goes around the deeper it's going to go you're going to end up with a track that you probably can't wire wheel out or file out or anything else once you get to where you're going give it a second or two to sit there and then get off if you run it to the end and go okay well this is what we look how nice that looks while this is tracking it's going to go deeper and deeper deeper the longer it sits there so don't let it sit there that's about the extent of what I have to offer here you've got the formula for finding out how long the circumference is whether or not we'll go evenly into your parts with three types of wheels the scissor the rotary and the straddle type holder the TPI the DP knurls always like the TPI narrow better personally and actually the 60 you believe it's a 64 DP neural has actually any industry been recommended as a stay away from neural so 264 DP neural is a pain in the neck to get to run true so I'll mess with it alright guys let's take a walk out of the shop set up the neuro I will show you the position the type of knurling tool holders that I have here and then we're going to step turn a piece of aluminum in specific diameter to go with this equation up here and we're going to see if it works like they say it does I let's take a look this is the straddle knurl that I had mentioned in the opening dialogue [Applause] adjustable this right this one is actually part of this tool holder which is very nice just some really super fine wheels on this you can almost not even see the teeth on those but you do position this so that your material is straight in the center and then you come down on it so there you go this is the straddle narrow this is the bevel edge style wheel and ship I can get that to show up on a macro you can see the chamfer on the side of the wheel so this would be a bevel edge this is not a sharp corner wheel this one is acceptable for traversing a piece of material and you can see the difference in the teeth ones left ones right so this will give you a diamond pattern neural I'm going to use for this demonstration is a scissor neural and you can see why they call it a scissor narrow materials on this side as you squeeze down on this particular adjuster nut the wheels come closed on the end and deliver it to you hopefully what you're looking for this is a 16 TPI diamond neural and this is a sharp corner so there is no no bevel like there was on the other one one left one right and since it does swivel this is a little more forgiving as far as centering it up is concerned but my good rule of thumb is I'll run this into the diameter of material that I'm cutting and I'll visually align this Center lug right here to the center of the material and I know that I'm fairly well where I want to be so let's set up the Chuck set up the material and turn a few diameters see what happens [Applause] this material is 1 inch to 52 in diameter 6061 aluminum using a 16 TPI diamond neural and just for sake of let's see if it works I'm going to move these wheels into location in several different spots and I'm going to come down to the same pressure and let's see how repeatable the process is giving no consideration whatsoever to the nominal diameter every time I shift my wheels I'm going to come back to the same reading on my cross slide so I know the orientation of the scissor neural is true to the diameter right now I'm going to look for a full footprint on the diameter the same spacing as I have on my wheels I'm going to give it a good heavy bite on the first try that's a pretty good crunch right there 175 rpm wd-40 has lubricated [Applause] now I have to say that I am very pleased with that I think we've got a good pattern both wheels appear to be tracking in a similar orientation which is good nice and wide so the perpendicular relationship of the tool to the part is good let's go a little bit deeper and see if we can get some points on these diamonds [Applause] [Applause] a little more pressure [Applause] [Applause] okay that is a visually appealing neural if you try to bring it to a diamond tip you may cause more damage than good so if you have a jeweler's loupe or a magnifying glass and you want to blow this up and watch for points on your diamonds naturally a dead sharp diamond is the way to go but you're also risk displacing too much material and introducing a lot of debris into your part so don't do it I'm going to mark my adjuster with a silver sharpie marker and I'm going to open it up we're going to shift over and see if it works twice [Applause] [Applause] same setting on the compound let's try not so good a heavy bite on the front the first try let's see if it tracks properly this is a real gentle contact very slight pressure still 175 barb again 1 HQ 52 [Applause] all right well that's exactly what I wanted to see happen you can see it's an exceptionally fine pattern right here and that's because these wheels are definitely not falling back into the same track so by penetrating the material you get closer to the diameter that you'll derive and your formula let's see if we can get away from this by just crunching down on it real hard right now okay well that's an awful lot of pressure see what we get [Applause] [Applause] [Music] [Applause] [Music] now it is entirely possible to have one wheel tracking back in the same groove and the other wheel cross-tracking so watch for that if you have dominant lines going in one direction and the other way looks all scattered and fragmented that's the problem you're having one of the two wheels is tracking true and the other one is not so whatever the fix is for that well we're going to turn down a couple of diameters here and see exactly what happened so this was one inch two fifty two with a 16 pitch knurl and it's a lot more successful when the penetration gets deeper and that's got to be because the contact point of the wheel is closer to the suggested diameter I'm going to turn this down to one inch to 45 and we're going to get a better look at light pressure see if the light pressure gives us a better track [Applause] you one inch 246 this is about six and a half thousand smaller than the previous stock size he'll let you get your teeth drill done take that sack [Applause] let's move back to where I believe we should be [Applause] now if there's any credibility to the formula the gentle contact should give us a nice X let's see if that's any any possibility of that happening it's real gentle pressure right now just enough to fight the part here we go [Applause] I'm going to zoom in on this for you and hopefully it stays in focus come on that's a little better okay now you can see how we're cutting substantially more teeth than the profile on that neural it just means this neural is going wherever it wants to go regardless is the nominal diameter that I just turned this to is almost chart perfect for 63 teeth per inch so let's get back to my philosophy of just crushing down on it and see if there's any truth to that heavy pressure [Music] [Applause] [Music] [Applause] okay I think the heavy pressures probably got a got a lot of credibility you can see if you take a nice big bite that you're going to get good results I also notice that the tips of these diamonds are a little bit flatter than the tips to the screen right naturally that's because it's a smaller diameter part so you'll have to go deeper with the part or excuse me deeper with the knurling wheels in order to get the desired result let's cut this down to the next half size actually I'm going to run one more track right alongside this one with a super deep bite right initially and let's see what happens [Applause] okay I'm going to go full pressure actually I'm going to go deeper than the setting on this one from the very start probably about a eighth of a turn [Applause] all right you can see by the left and right lines that everything is tracking right where it should the tip of the diamond is getting a little bit smaller because the depth of the cut I don't know if this camera will pick up the surface displacement or not it does a little bit as you can see that this diameter here is getting a little bit bigger than this one got a real nice pattern going there let's turn one more diameter a little bit smaller than the one we're using and see if this still holds true even had it completely off size [Applause] you okay if you were to do the math this is one inch to 37 and there's nothing good about this diameter this neural is not supposed to track a good diameter cut a repeatable cut on this diameter but let's get back to that nice deep bite to see if that works I'll do a Lightwood first and then I'll do a deep one over here if it works I'll run it I'll run the distance [Applause] [Applause] nice light contact to start she was kind of towner we get I'll be really shocked if it's anything close to good be honest we didn't but you never know [Applause] this is a outstanding example of what I was trying to point out before you have one wheel that you're tracking very well repeatable and the other wheel is cross tracking that's why you have such a horrible uneven pattern I'm going to crunch down on it right now and see if it erases that I'm approximately one-quarter turn deeper then I was set here and as you lubricate a neural be very careful about this pinch point right here whatever enters this area while this is spinning is going to go around fingers brushes rags tips and air nozzles anything that gets close to that pinch point right there is going in there's a tremendous amount of potential for injury and damage right there so stay away from it if you're going to put lubrication on your knurls do it on top of the knurling wheel and brush it diagonally so not only are you lubricating it but you're brushing away debris in the neural itself heavy pressure [Applause] [Music] [Applause] [Music] [Applause] well I got to say that that heavy pressure technique is really good now that I have a pattern that I'm pleased with I'm going to back off on this pressure as not to stress this wheel out and let's run it back and forth on the left it might take a minute I might have to speed the film up for this but let's see if we can make a decent patter for about an inch on this diameter I'll be feeding this by hand [Applause] factors pressure off approximately a quarter of a turn [Music] [Applause] when you give it a little bit more pressure come back the other way and intentionally I will stop and dwell on this end to illustrate how the knurl will continue to migrate as it displaces the material and it will end up with a line in the part so it will be intentional what I do I have to believe that the amount of debris this is producing an indicator that it's too deep I would normally pull it out right here we're going to let it sit for a second [Applause] proves my point [Applause] I would say that's a favorable diamond knurl and I don't know if your eyes or the camera sense it enough to pick this up but there is a definite line in this part right about here where I had anticipated the wheel would cause one and it certainly did best way to clean up the knurl is with a wire brush and not just brush it like you're brushing paint but brush with the direction of the knurl me go grab one will clean this [Applause] I am very pleased with that although is not the type of neural you should be using to traverse a part because the edges are sharp the chances of displacing material bulldozing material and snapping the edges off of your neural are greatly increased so if you're going to run a long narrow use a bevel edge or a convex neural you can see that on this particular example regardless of what the diameter was and the diameter is varied substantially from neural to neural taking a good deep bite on the first try it's probably going to yield better results every time so give it a go guys okay well I hope that practical demonstration showed you exactly how delicate knurling is and possibly how unpredictable knurling can be and the one thing that I failed to tell you about initially was how critical the perpendicular alignment of your tool is to the workpiece if the perpendicular alignment is not almost dead on you're going to have a neural that's heavier on one side and later on the other side and you'll see this when you look at the profile boundary of your wheel if you're cutting more on the right hand side than the left hand side deeper and it will be very obvious that just tweak your tool a little bit until that neural tracks same depth across the width of your part if you do have a critical part that you need to know that you have a neural that's going to repeat perfectly on the first try set it up offline do a test piece come up with your numbers come up with your settings on your wheels and everything and then just hope that it works out the same on your part anyway I hope you enjoyed what you saw thanks for hanging in right here in the USA it is a fourth of July weekend so happy fourth of July to all my neighbors here in the US don't blow up anything that's important and drop it next time I post another video until then don't buy advance innovations Austin Texas you

Channel: Joe Pieczynski

Views: 400,665

Rating: 4.8759303 out of 5

Keywords: joe pie, joe pieczynski, advanced innovations, advanced innovations llc, lathe, lathe tutorials, shop tricks, shop hacks, knurling, how to knurl, knurling wheels, types of knurls, diamond knurls, straight knurls, machining

Id: 9Zwi0ZAUCUc

Length: 35min 36sec (2136 seconds)

Published: Sun Jul 02 2017

Reddit Comments

[u/texastoasty]

I want a lathe

[u/grauenwolf]

Not as funny as AvE, but I always learn something from him.