First chuck backplate turning/setup

[mikey]

I agree; I wouldn't worry too much about the balance.

 

[GunsOfNavarone]

Update. I skim cut the contact surface and lightly touched off the register. I used transfer screws and marked the plate and put the back plate on my indexing head in vertical position. Indicated in the part and found center of the punch marks...ran a spotting drill the a 6.5mm drill bit with 120 degree seperation and punched them through. My last step, either use a tap OR I have these spiral drill/taps to take it to 8mm x 1.25 tpm. I hate tapping though I normally do Stainless. Anyone ever use spiral drill taps? Not gonna lie, I'm a bit skeptical so I'm putting the last step off until tomorrow.

 

[mmcmdl]

Spiral flute taps , spiral point taps . Spiral drill taps ? Are they a drill and tap combined ?

 

[GunsOfNavarone]

@mmcmdl yes sir. Drill/tap and even chamfer.

 

[mmcmdl]

Well , I've never ! I'll have to check them out , never seen one .

 

[GunsOfNavarone]

Nevermind....I'm a knucklehead. The back plate doesn't need to be threaded..just gotta open the holes up another mm and give it a test. I did all I could, took my time. Its in Gods hands!
These are the type of drill/taps
Spiral drill taps

 

[mmcmdl]

Designed to tap up to 10-gauge metal

Not sure that would work even if you needed to tap those holes .

 

[GunsOfNavarone]

Well, technically they are these...though they don't say how thick of metal they are for..there is a reason for my skepticism.
McMaster

 

[mmcmdl]

Ok . They look like the smaller ones would work . I sure wouldn't trust a 1/4" hex to drive anything over a 1/4-20 tap though . No way it would drive a 3/4" tap !

 

[mikey]

Okay, so the chuck is mounted? Are you happy with the fit?