Turning an Adapter to Hold a Lathe Chuck on the Lathe

Added: 2026-05-08

[00:00:07]Hello, Keith Rucker here at vanish machinery.org. Guys, today I got a quick little project I want to get knocked out here. Uh, shouldn't take too long. I've got a fourjaw chuck here. On the back, it has a old school uh threaded back plate here that's inch and a half by 10 threads per inch. And um what I want to do is just make an arbor that I can screw up onto this chuck that has an inch and a half diameter that I can then put into a tool holder to be able to turn this chuck. So fairly simple job.

[00:00:38]I've got a piece of 4140. This is uh what two and a quarter I think diameter uh we're going to be making it out of.

[00:00:46]That'll leave a nice little collar in there. Um yeah, pretty simple little lathe job. We're going to get over here to the lathe. Let me show you a sketch of what we're going to draw or what we're going to make and we'll get to work. Get this knocked out.

[00:01:00]Pretty straightforward here. Again, I got 4 and 12 in of steel. Uh I need to turn inch and a quarter on this side.

[00:01:05]About 2 and 12 inches long. We'll leave about a/ inch collar in there. We'll just probably leave that whatever the nominal size of that material is. Turn this down inch and a half u diameter, inch and a half long. And that gets threaded at 10 threads per inch where that chuck will screw up on it. Let's go to the lathe and uh let's see what we can do. All right, I'm over at the Monarch 16inch lathe, a model K lathe, and we got a piece of stock in here. Um got a little bit of a crooked saw cut on this side. I'm going to face that off, get that squared up. I'm going to start by turning the U side that's not going to be threaded. That way when I flip it over, we can thread the other side. And and if I thread this side first, it' be hard for work holding. So that'll give me a good workholding surface. So, uh, let's, uh, get this tred up and we'll get that knocked out.

[00:01:54]Yeah, I got a crooked saw cut. So, uh, just going to face that.

[00:02:09]All right.

[00:02:24]I want to zero out the digital readout there on my Z-axis for the length. Uh, I need to turn this 2 and 1/2 in in. So, I'm going to go ahead and dial that in.

[00:02:38]Make a mark here. This is not a critical measurement.

[00:02:44]And this gets turned down to inch and a quarter.

[00:02:52]I think we're at two and a quarter right now if I remember right. So we got about an inch to take off the diameter.

[00:03:04]Getting a little stringy gummy chip here.

[00:03:09]Not really breaking.

[00:03:12]Hope we don't get a squirrel's nest here. Rat's nest when it gets up to the chunk. Ah, come on. Break out.

[00:03:42]get a diameter here to put my digital readout. And we are at 2.135.

[00:04:03]Now my chip's breaking pretty good. I don't know what the deal was.

[00:04:15]Maybe it was just taking that outside skin off was a little softer or something.

[00:04:30]Getting down to the wire here. I'm going to make a light pass down through here, get a good measurement, and we'll make a finished pass to get it to the final dimension.

[00:04:52]And we are at 1.288.

[00:05:00]I'm going to do this in two passes. I'm going to take 20,000 here.

[00:05:29]And when we get down to the bottom here, we're going to square up that back shoulder.

[00:05:47]That'll do it.

[00:05:51]And now I want to break some corners.

[00:06:00]Put a nice shamfer down here with that lead in good.

[00:06:06]And then also just break this corner up here.

[00:06:12]There we go. And then I think that side is done.

[00:06:17]Flip this around now.

[00:06:35]And we'll start again by facing the front.

[00:06:44]I'm going zero out my Z-axis.

[00:06:48]This one goes in an inch and a half right there.

[00:06:56]Mark that.

[00:06:59]And this gets turned down to inch and a half.

[00:07:24]All right, we're getting down close. I'm going to do about a 20,000 cut here.

[00:07:29]Get a good measurement and then we'll uh finish this thing out.

[00:07:37]Do another 20.

[00:07:49]And once again, we'll clean up that back shoulder.

[00:08:00]I'm going to recess in.

[00:08:06]It's going to be threaded.

[00:08:13]I want to I don't want to take it all the way to the shoulder in the back.

[00:08:19]I want to have a little bit of a gap in there.

[00:08:26]And I'm going to reface this front, too, because that insert was giving me problems a while ago.

[00:08:35]That looks a lot better.

[00:08:42]break this edge.

[00:08:48]Put a threading tool in.

[00:08:51]I'm going to put a threading tool in and I'm going to break the front edge with that so that I have the same lead in angle as the thread.

[00:09:05]And I'm also going to come back here in this back and kind of have the same lead in angle coming out the back side of it.

[00:09:21]All right, let me get set up for 10 threads per inch and we'll put some threads on there.

[00:09:27]So, I'm over at my quick change gear box. I need to find 10, which is right here. here. So, I'm going to pull my tumbler over. We'll come up in there.

[00:09:36]And that range needs to be A and then E.

[00:09:47]There we go.

[00:09:50]And I also need to change this one over to go to the lead screw for threading.

[00:09:55]All right. So, we are on 10 threads per inch. A E and in the right mode there for threading. Let's uh go put some threads on.

[00:10:05]I think I may have missed threading that on the I think I forgot to turn the camera on, but I have cut my threads on there. We're going to try this out for a fit now.

[00:10:24]Think it's a little bit tight. I don't know. Let's see. It is going on there.

[00:10:34]Perhaps just a tad snug. Tell you what, I'm going to do just a another light pass on there. But we're right there where it needs to be.

[00:10:51]I think I'm just going to just do it about a 2000s.

[00:11:03]And let's try that.

[00:11:06]And I think this is going to be good.

[00:11:08]Here it was.

[00:11:12]Yeah, that is beautiful.

[00:11:29]Maybe again just a little bit tight down here in the bottom. Tell you what, I'm going to take another about two thou off of there.

[00:11:41]That's not bad at all. I could probably get that on there, but it's just going to be a little bit on the tight side.

[00:11:56]All right, I think we're good.

[00:12:13]I think we're done on the lathe. I do want to cut just some flats back here on the back where the set screws are going to go on that collar or on that shaft, but uh I think we're good. Let me um get this out. We'll head over to the mill and do that.

[00:12:27]I'm now over here at the milling machine. I've got a V block in here that I'm clamping up against the vice with that kind of helps keep everything square hopefully. And uh I just want to put a little flap on this shaft here so that the set screw has something to bite into without scarring up the shaft. So, I'm just going to touch off on there.

[00:12:53]There we go.

[00:12:57]And we'll raise up just a little bit.

[00:13:04]Doesn't need a whole lot.

[00:13:11]Just a little flat.

[00:13:16]I'm going to do a little bit more than that.

[00:13:20]That was roughly 25,000.

[00:13:25]This will make roughly 50,000 deep.

[00:13:42]I'll just square that bottom off.

[00:13:48]And that should do it.

[00:13:53]This job is done.

[00:14:05]And there we go. One little uh adapter that's going to screw down into my chuck here.

[00:14:13]And now we can take this over and put it into a machine with a inch and a quarter um shaft on it.

[00:14:25]Just like that. That was what we needed.

[00:14:29]Job done.

[00:14:33]Well, that was easy. So, we got that knocked out. And uh that is checked off the list. Yeah, sometimes it's just finding time to do these little jobs like this. That's something I've been needing to get knocked out for a while.

[00:14:45]And uh yeah, we just decided to get it done on this uh morning.

[00:14:49]Took a couple hours, probably about an hour and a half really. And that's with me filming and everything in between.

[00:14:54]Wasn't too bad. All right, guys. With that, that's a wrap. As always, thanks so much for watching. Please do subscribe to the channel if you haven't already. Those thumbs up and comments are always greatly appreciated. Please hit that bell icon to get notifications when new videos are posted. As always, a huge thank you those who support the site financially through Patreon, PayPal, and YouTube memberships, which are all great ways of helping out around here. And uh with that, we're going to sign off. We'll catch you on the next video. Again, as always, thanks for watching.