K72-80 Chuck Disassembly

[woody1Participant @woody1]

Evening all, hope well and safe,

I have the 80mm 4jaw and have buggered one of the t-slots for want of a better word. It's just a couple of burrs toward the centre. I'm struggling to explain. I think where I have been ham fisted the leading edge of the screw (for want of a better word) has caught on top of the t-slot due to the load and cased three burrs.

Would any of you kind gents know how I get the screws (scrolls perhaps) out. I can se there are threaded plugs in the rear which will be the way to go. However I'm not sure if threaded (right or left) or just pushed in which I highly doubt.

Excuse my rubbish explanation.

[woody1Participant @woody1]

Buggered my chuck a little

[Alexander Smith 1Participant @alexandersmith1]

Hi Woody, if it's like a standard 4-jaw chuck, the screws are retained by the plug you can see from the back. The plug has a u- shaped end which locks into a groove about half way along the screw. If you look from the top you should see the groove and the ends of the U at either side. I think there is probably a special tool for getting the u- shaped key out but I've done it in the past with a thin punch- work both sides alternately a little at a time and you should see the plug starting to emerge. To get it out fully you might need to make a punch with a slight bend to get round the corner. I'm not describing this at all well and a picture would be a lot better but all will become clear as the plug emerges.Good luck. Sandy

[old martParticipant @oldmart]

Photos of both sides of the chuck would help. The  common type are just pushed in with an interference fit. You will probably have to make, or modify a thin punch to knock the offending one out. Before you do that, scratch a line across the plug and the chuck body to help line it up when you refit it. I have removed the plugs from three chucks successfully. Also number them if taking more than one out.

Edited By old mart on 13/06/2020 20:43:07

[woody1Participant @woody1]

Thanks guys, I used a bent punch, didn't have to completely remove the yolks, dressed everything up and the chuck is a lot more smooth. All I have to do now is learn how not to tread chucks like a vice!

[Author]

Posts