HELP FOR 3.4mm HOLE 204mm DEEP

[CNC-ERIC]

HI, there,

 

can you please help me out for the job? what kind drill is suitablt to this job?how to remove the chips?rpm? peck? feed?

 

I have job which is brass 110 with 11 blind holes, holes are 3.4mm by 204mm deep,dia tolerance is 0~0.15mm. we have a HAAS VF-2 mill center no through coolant.

 

thanks very much

 

Eric

[Allan]

That is a .134" dia hole 8 inches deep with a .006" tolerance

And there are 11 of them..oh my.

Best to sub the job out to someone with a gundrill IMHO.

 

Can you even buy a .134 drill 8" long?

[RayD]

EDM

[Del.]

Good hole popper should do it within that tolerance.

[darko herak]

gun drill , for dia 4mm yuo can use 4400 rpm and feed of 35 mm/min, shoul work for 3.4 also , but there will stay problem, becouse you will need high preasure through coolant

[GoetzInd]

If it's low qty I'm for either sending out for gun drilling or EDM. If this is going to be a longer ongoing prodject, maybe get a coolant inducing holder and gun drill it in the machine. Lyndex makes one that can do 500 psi. Might be enough in brass.

 

Mike