Three Jaw Chucks on Logan Clausing Hardinge Lathes part 2 tubalcain

[hifellow]

Great video Pete! I needed to know how to get these chucks apart

and this was a great tutorial.

[empirecycleworks]

I have a 3 jaw similar if not the same as the one you have disassembled on the bench. My question is: Can I use the outside of the jaws to clamp the inner diameter of say, a short length of pipe or a ring? I have used this method to reduce the glazing on brake drums with sand paper, but now i wonder if i'm shortening the life of the chuck.

[mrpete222]

@empirecycleworks Yes-- I use that method often.

[ExtremeMojo3]

There is also the "el cheapo" adjustable 3 jaw chuck... when you have a bit of room to center the chuck to its backplate (mine with 3 machine screws). Did it this weekend (8" D1-5). Got it within +/- .00007. The idea is to find the high spot. Loose the 2 lowest screws. Then loose the topmost screw just a tiny bit for it to slide when you lightly tap it downwards with a deadblow hammer. Find the new high spot and do it again till you get it where you want it. I used an endmill to indicate.

[mrpete222]

It sounds to me like your chuck is damaged. Take the jaws out, clean them & inspect all parts.

[wintermire]

When placing a part in my chuck if it is not held perfectly straight the jaws will tighten down and hold the part at the angle it was held at. Not straight. Are the teeth of the jaws worn or is there some kind of trick to get the part straight in the chuck when tightening it?

[2x4tube]

Tops! thanks for the info.

Is there a tip to getting the chuck apart? I have been putting off cleaning my 3 jaw as i cannot pop it open..

Thanks Pete!

[jfco61]

yes,yes!

[mrpete222]

@jfco61 Loosen the 3 cap screws that hold the chuck together. Then tap on the heads of the screws with a brass hammer.