What tooling to drill lots of 10mm holes 45mm deep?

[AlanMJackson]

Here's a picture of my machine in case you're curious what it looks like...

[mekanik]

Hi Alan
A different perspective ?
I am not fortunate enough to have a CNC machine so do most of my stuff using jigs, with your equipment you could make a very accurate jig from MDF with it bored @ your required locations to suite a router guide bush,variable speed router would allow you to dial in the required speed and i can see no reason why 2 or 3 plunges should not complete a drilling(plus you can feel how it's cutting. would go with the bit that Dean suggested earlier as i think you need it scribing on breakthrough to try and negate breakout.
regards
Mike

[AlanMJackson]

Mike,

Do you think it would be possible to bore out the counter bore collar of something like this:

Trend CB58-14HSS 1/4 drill dia. x 5/8 counterbore

so it would take a 10mm drill? Is that madness?

[irving2008]

Mike,

Do you think it would be possible to bore out the counter bore collar of something like this:

Trend CB58-14HSS 1/4 drill dia. x 5/8 counterbore

so it would take a 10mm drill? Is that madness?

It might be possible but
a) there'd be 2mm less thread for the locking grub screw which may be an issue; and
b) you'd probably need to bore/drill it out in a lathe for any degree of accuracy in run-out.

[GEOFFREY]

I would think that the counter bore is likely to be hardened steel so may be difficult to machine. If the thread depth on the grub screw is insufficient to get a good grip on the drill, you could try using say 3 grub screws. I would think it would be easier to use a fairly low quality drill (soft) and turn the shank down. G.