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Reducing a drill shank for ER11 collets


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Have a job that was two ops, I'm trying to get it down to one, but that requires using a 5" extension with a diameter of no more than 3/4". I had initially programmed it for a 9/32" tool, but our CNC lead says we need to use a 7.3mm drill... only problem is I can't find an ER11 collet that will hold the 8mm shank.

I'm thinking I can probably get away with having the shank ground down to 9/32 from 8mm. Just poking a few holes in inconel, will be spot drilled. Anyone think this will fail catastrophically? I think it'll be fine if I back up my feed/speed a little, but I've never tried this before.

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27 minutes ago, nickbe10 said:

Should work as long as you can keep the grind concentric with the original shank.

Just remember Inconel is an unforgiving material so any errors will be laid bare fairly rapidly.

HSS or carbide tool? HSS might be more forgiving than carbide........

Was going to use a carbide drill, but I've had pretty good luck lately with Nachi powdered metal. The vendor I was going to use for grinding doesn't like working in anything other than carbide though.

1 minute ago, Matthew Hajicek™ - Conventus said:

I assume this is in a machine that can't use an ER-16 collet?

It can, but the hole is only about .400" away from a 5"+ tall wall. Smallest ER16 extension or holder I could find was over 1" diameter.

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