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M33 x 3.5mm nuts

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john taylor:
I use a 30mm forstner drill for the M33 x 3.5 and a 22mm forstner bit for the 1" x 8 taps they seem to work well.   Toolpost recomend a drill 1/8" or 3mm smaller then the tap.

I have just finished a pictorial how to on how I use the tap on my website http://www.woodturned.co.uk/html/faceplates_etc.html

All comments good, bad or indifferent welcome.

john

Dave Atkinson:
Thanks for the info everyone.

John, thanks I'd love the nuts for now I'll send you a PM

Cheers Dave

Bryan Milham:
John, thank you for the detailed instructions on your website, very informative. Forstner bit's I do have.

Jean:
I use the tapped wood method as well - it's the easiest and cheapest way of making custom jigs. especially when it comes to vacuum chucking. The first 4 chucks I made myself paid for the whole vacuum pump aand connections!

I have found boxwood to be the most reliable in terms of weather interference (i.e. movement), with maple useful if nothing else is available. I use an oval shaped log of solid boxwood and cut the thread into the end grain. That way I also have a naturally shaped handle that I can use to remove the chuck from the spindle, if necessary with the use of a boa.

So long as you true up the end of the log before starting to drill (so it sits true against the spindle stop), are reasonably accurate when you drill the hole, and use the tailstock for support when you are tapping the thread, it works! The benefit is that you screw the chuck 'base' onto your spindle and then true things up. 

I mostly use boxwood as the 'nut' part, and then epoxy onto that whatever 'faceplate' part I want to make. The advantage of doing this is that even eccentric chucks can be made easily - about 40 minutes from start to finish, including coating the whole of the exterior with thin epoxy resin to make it air-tight when I want to use them with my vac chuck system. 24 hours later, you have a long-lasting chuck that cost next to nothing and is made to suit the job in hand.

Dave Atkinson:
The nuts arrived today - a big thank you to John. ;D

I'm going to make a customer faceplate to use with my vacuum chuck but like many things it's on a rather long list.    ::)  I'll take a photo or two and let you know how I get on.

Cheers Dave

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