Anyone Know About Friction Welding? AKA Making a New Vise Screw

[Eddyde]

I wonder if an magnetic clutch as used in an automotive a/c unit might have enough holding torque for an instant release mechanism.

RJ that's a great idea for setting up for a production run. But for a one-off part, I think the time investment alone in making it work would be significant. I was thinking of a chuck mounted to a live center held by a pin resting on another pin held in the toolholder Thus a quick turn of the traverse wheel would disengage it.

 

[cjtoombs]

I'm wondering if doing some auxiliary heating with a torch might help the process along. Even a decent propane torch might help a lot.

 

[Eddyde]

I'm wondering if doing some auxiliary heating with a torch might help the process along. Even a decent propane torch might help a lot.

I was thinking about that but after trying the process it seems to heat up pretty quickly. Though when I try welding it to the hub it may be a different story with the parts being of different mass. I that case additional heat might be necessary.

 

[Eddyde]

Update:
I screwed up, I literally screwed up. I ordered the wrong thread pitch! somehow I had it stuck in my head that it was a ⅞"5 tpi lead screw not sure how I came to that conclusion but it was set, a couple of years ago, when I first started this project, did I double check, no, did I even measure it, I don't remember. I just ordered it... it actually is a ⅞" 4 tip thread. Anyway, the worst thing is that thread doesn't seem to exist in the acme screw world so now I'm faced with making it from scratch, which I will, eventually.
in the meantime I painted the vise and put it back together. I figure with about 2" of thread in the nut the screw has plenty of engagement and the eroded threads shouldn't cause too much damage till I have the time to make a new screw.
I even made a new end cap from aluminum.

 

[RJSakowski]

I believe that Tom Lipton , aka OxTools, made a miniature bullet vise from scratch several tears back. Perhaps you might find some useful information in his videos.

 

[strantor]

Not sure what's in the vise: is the casting threaded or is there a nut? If there's a nut:

• Odds are that it's as damaged as the screw and could stand being replaced too.
• It would probably be just as easy to make as the screw.
• Going from 4 TPI to 5TPI should give you more clamping force for the same torque applied.

 

[mmcmdl]

it actually is a ⅞" 4 tip thread.

I had it stuck in my head that it was a ⅞"5 tpi lead screw

What's 1 thread per inch in a vise that size ? Can't say I've never done that .

 

[DavidR8]

What's 1 thread per inch in a vise that size ? Can't say I've never done that .

110, 111, what ever it takes

 

[mmcmdl]

Hey Ed . FWIW . We stripped the threads out of our very large Starrett vise in at work today ! Pulled the Acme stud out and had a perfect spiral chip that was left of the piece inside . Just thought you would get a laugh out of this . On the other hand , we'll check out the $$$ for a replacement piece or have to buy a new vise . I'm going to advise them to give it to the scrap man ............................................which is me .

 

[JShipley54]

Looks good!!


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