8mm drill 3.50” deep high qty no tsc

[Dukerc51]

So I have a job to quote with 96 holes in 6061. I have an older mill with no tsc. I’ve rigged up rotary coolant adapters for insert drills before. Are there any type of tool holders available so I could use a stock coolant through drill? 96 holes per part with a potential for some quantities. I have a new mill coming but it won’t be here in time for this job.

 

[Milland]

Coolant induced tool holders. Many vendors and tapers out there, here's one:

Tool Holders, Mill Holders, Collets: Collis Toolholder Iowa

Might not be worth it if you're willing to develop a good pecking strategy - much easier to do in Al than steels. Might need to hand code, but that's not too deep for that diameter.

 

[mhajicek]

96 holes isn't that much, unless you mean 96 holes per part in a long run.

96 total holes, no TSC, I'd use a cobalt drill and peck it.

 

[Milland]

96 holes isn't that much, unless you mean 96 holes per part in a long run.

96 total holes, no TSC, I'd use a cobalt drill and peck it.

OP does say "per part", but I agree that pecking might be fine. Especially if all he has is regular pump pressure (~60psi), which likely means still having to peck at the deeper levels.

I wouldn't use a cobalt split point here, I'd want an Al-specific drill, which should allow for better chip evacuation than a split point (which tends to "gum up" a bit at the split, creating more friction).

 

[Larry Dickman]

great application for a MA Ford super twister

 

[Dukerc51]

Thanks for the replies. Yes I just have regular pump pressure. It is 96 holes per part. Potential to do 100 parts.

 

[mhajicek]

Thanks for the replies. Yes I just have regular pump pressure. It is 96 holes per part. Potential to do 100 parts.

Ok, 9600 holes is worth putting some effort into. You'll probably have best luck with an aluminum specific drill.