Chuck nuts……

[Sub MandrelParticipant @submandrel]

When I fitted taper roller bearings to my mini lathe, the slight change in spindle position created about 4-6mm of extra room behind the flange – might not sound much but made a huge difference.

I can't see the need for washers/flange on my lathe as the stud holes in the flange area close fit (6.5mm?) on the studs.

Neil

[KWILParticipant @kwil]

If you really want a "special", you could turn down the bottom of a nut and fit an oversize washer to the stub, Washer needs to be counterbored and you could lightly spread the stub with a ball. Made to fit.

[BazyleParticipant @bazyle]

On my Hobbymat the studs are long enough that I can trap the nut between the stud and the headstock until I can give it a bit of a turn. This looks more reliable.

[john kennedy 1Participant @johnkennedy1]

Posted by JasonB on 18/10/2013 17:10:40:

John on my 3 jaw that wa very tight on the register I cut a shallow 1deg taper for most of the length of the socket in the backplate so once its been jacked off about 2mm it is free from then on. I can do a change in just over 60secs.

J

Jason, I've now done both my chucks using the method you suggested. I only did the 1 deg taper about 5mm deep. If anyone else is struggling with the same problem I recommend you do this mod. Loosen the nuts,wiggle the chuck and it just pops off. Put some photos in my album. Thanks again .. John

[Howard LewisParticipant @howardlewis46836]

Two comments, which I hope are helpful.

1) If a cycle thread is Imperial size, it is most likely to be 26 tpi with a 60 degree thread form (NOT 55 degree like BSW; BSF, or British Standard Brass).

26tpi was the standard pitch for cycle threads, and for BSB, but the thread forms differ.

2) If you want metric nuts which are washer faced, go to a Perkins Engines dealer. They use M5, M6, M8, M10 and M12 on their engines, all with washer face flanges on the nut. (Try "Di perk" on Google to find one near you)

You may find some at a Caterpillar dealership, because some of their smaller engines use the same hardware.

Howard

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