Nova chuck, Cole jaws and grippers

today I want to talk a little bit about the Nova Chuck and cold jaws and the grippers that I make and how to use all them combined this all came about when I bought another set of cold jaws for my Nova chucks I have for them I have them from the very standard units to the Titan which you see on the lathe right now and I have one of the previous models here and here's the Cole jaws that I purchased several years ago these cold jaws that are on this Chuck came in yesterday and I've noticed a few changes and most of them are rather minor changes for instance you'll see the resolution of holes here is greater than here and by that I mean they've just sprinkled in more holes so you have smaller steps between the holes and that's actually kind of nice because sometimes when you were trying to place things you put on one set of holes and maybe it was not quite tight enough in the other set you couldn't quite get the ball in there so I think that will help now you see that I have the steel jaws on here I think they're like the standard ones and they're mounted on top of the cold jaws that came about because they now package the current set of cold jaws with longer screws you have to use steel jaws on top of them I don't really know why they did that you can kind of surmise that maybe they thought that you're getting more support here and therefore more strength and I guess there's some merit to that although the attachment point stays the same underneath this so fundamentally I don't know how much a change that really makes the previous ones came with just the standard leg screws and that's all I've been using for many years and I've never had a problem so I think I'll go back to just the standard size screws or standard length screws and forget about trying to stack these up because it's kind of cumbersome to put them all on at once like that you have to get everything lined up you'll see that I have these on here now and this was intended to be for a bowl that I'm going to turn the foot out and this bowl is kind of large let's see in fact let me get a scale it's right out near the limits of what I can grab it's just about 10 and 1/16 inch and I'm going to grab it on the outside so that means that I had to put the cold jaws on my tighten Chuck if I put them on a standard Chuck and try and open it up as far as that will go this this bowl here will not actually fit so I have it on the tighten Chuck and that's fine now the grippers I make are just like this and if you go to my website or if you've seen them being used here before you'll see they're a bit different from the grippers that they give you with the Chuck they're made with a aluminum core here and then there's a slide on sleeve which is pressed on actually it doesn't slide out and off you can't just slide this off and that is the part that grips the wood I initially made these four bowls that have a lip that is unlike this one it would fold over in other words they would round over and drop down so when you want to put on the Chuck that the outer edge was rolled down and it would actually be above the gripper so I made these and that solve that problem but as a consequence of how I made them they're much more round than the rubber that they give you and by that I mean they're just a lot more accurate another thing about these is that because of the aluminum core when you tighten the screw down it tightens up against the aluminum doesn't affect the rubber or compliant surface that is going to actually grip the wood unlike the ones they give you if you tighten them up differently one from the other that's where a lot of your run-out comes and run out as when the bull is out in there and just seems to be wobbling very slightly and sometimes it can be difficult to start your cut even though you turned it round when you flipped it around and put out the cold jaws now it's moving around that's where that comes from when you use these grippers you really don't get that so the old grippers here I hope you can see that our rubber and the new ones that came with these new coal jaws are also rubber but they're clearly of a different rubber and there's slight differences there used to be a lip here very tiny and that's gone but fundamentally they're the same thing when you tighten up the screw on these things they'll squish out they'll get different diameters and it really messes up with your alignment so I don't use them at all for anything now as I said earlier when I made these grippers it was intended to solve the problem of that lip well when you're going to grip a bowl like this clearly this goes right down to the surface it's a nice almost square edge if you go to use that with my grippers you'll actually encounter that you're going to fall right on that edge which is the support surface of the core of my gripper you don't want to grip the bowl on that that's hard to lube it up and it's going to make little marks in your bowl so what you can do to solve that is what I've done here let me pull one of these off this is nothing more than a strip of wood that I have a small piece of carpet a pile and that will go in between to the grippers in the area where the bowl is going to go onto the Chuck and the way that works is this is higher than the lip on the gripper so now you're going to engage up into this sleeve area which is where you want to and you put this on you go right up against those four pieces of wood then when you tighten it up you're engaging the gripper and you're secure the way you make these is really simple I do it on my table saw you want to strip or rather rip a piece of strip of wood off of a board that is maybe a half inch 3/8 thick it doesn't matter entirely and thin say a quarter inch that will clear the lip on the gripper those are approximate dimensions and honestly what the dimensions exactly are doesn't matter the key point is they all have to be identical and the way to do that is you just cut a strip of wood at one go on your table saw that's about a foot long you cut it into four or sort of equal pieces and there again accuracy is not important and then you put a double stick tape on the back and put them on like this and you're good to go if you're going to use this method there's one next step you want to do before you turn your lathe on and that is you reach in here and you take this out of the way you want these off the reason you want them out of the way is if you're turning and this were to fly out it'd be a very bad day for you it's almost inevitable it's going to hit you and this is always harder than any part of your body so you want these out of there so they don't come out like little pieces of shrapnel intuitively it seems like Oh beer I'm not really supported here now there's a gap well the grippers don't care they're going to hold it in either direction this way or that way so it won't go in it won't come out I've done it like this many times and there's no problem also you can see as I'm turning this there is no run-out like I stated this bowl is perfectly centered on your Chuck and it will turn just like it did when it was on your face plate or chuck as you can see here I had it on a chuck with the B the V jaws holding it on the inside and that's why I turned most of this now I want to turn the foot and you want that thing to rotate true to your lathe now it well with these grippers so I want to point out those little details about the previous cold jaws the current cold jaws how to use my grippers when you have an edge like this that doesn't roll away from the surface so that you can't just place it on the face of your cold jaws and you can just index it out the small pieces of wood like that and you're good to go in fact if you're going to do this on the bench and you have this leg flat you don't even have to use the tape on those pieces of wood because gravity of course will hold them in place once you clamp this in into the Chuck you're good to go take those pieces of wood out of the way and start your turning I hope that helps people figure out how to do such things and how to use not only my product but the Cole jaws in general thanks for watching it's going to get ready to turn this just presented how to set this up in the cold jaws and how to use my grippers and such and I thought about how I mount this and have that gap there and I'm sure many of you are probably skeptical I say oh the afternoon this all the time but you don't see me actually do it so I thought let's do it so I'm going to start turning this bottom now you'll see when I first start this this will be out of round a bit because this part I haven't turned since I turned it when it was wet so it's worked a little bit and that's of course why you return it so let's pull up the way the mix of jokes you see I got some of that bark out of the way but I still got a little infusion but they're going to roll that edge anyway and make that go away every time I move well my kind of to arrest though I spin this just to be certain it's just to habit I have I'm I don't see any need to break it now I'll just leave out that I guess I could say and so on and so forth because I'll just continue to work this until I get it where I want it but I just wanted to prove that yes these do hold fine even with that gap in there you don't need this resting up against the face of the coal jaw to be safe thanks for watching

Channel: SegmentedTurner

Views: 50,317

Keywords: woodturning, lathe, chuck, nova, cole, jaws, grippers, bumpers, buffers, teknatool, wood, turning

Id: anQfc8oLSjI

Length: 14min 13sec (853 seconds)

Published: Thu Oct 22 2015