Deep Drill Titanium

[SLJ]

Got a part that's basically a hinge. 6AL-4V Titanium. Need to put a hole through it. .095 dia. x 1.5 deep through hole. We sent it out last time to be Gun Drilled and honed, and got poor service (delivery and locational accuracy). We are thinking about peck drilling and reaming next time. Anybody have any recomendations for drill type,ect.? Looked at the OSG catalog and the Exocarb drill doesn't go that small. At over 15x dia. depth, and .001 positional tol. to itself, I have my doubts, but not my decision.

[mcpgmr]

I think Cammando can help you with this one. His shop does alot of this type of work with Titanim. Do you have a Die Sinker EDM and a Hone ? Hang tight. Someone here will point you in the right direction.

[SLJ]

No EDM, Just 3 axis vertical mills. Any sugestions would be apreciated.

[Bill Sp]

We would hole pop and wire it.

[mcpgmr]

Without having whole lot of experiance with Titanium I would suggest drilling smaller leaving about .01 in the hole. Then use a carbide undersize E.M. to true up the hole leaving about .005. Then using a Jig Bore type reamer go in and finish. Sometimes carbide is not the best choice for 6AL-4V so consider M42 Cobalt for your drill and Jig Bore Reamer.

[Harryman]

Check out Drillmasters.com

 

They offer gun drills that size.

[CAM-mando]

I would Gun drill undersize and wire EDM to finish size / location.

 

If the EDM vendor has hole popping capability, that may be an option. Ti is a very slow burner though.

[SLJ]

Sounds like we just need to look for another gun drill shop. Sounds like EDM may be too expensive for us on this job. Thanks for the replies guys

[CAM-mando]

That .001" True position with gun drilling is going to be tough.

[chris m]

Take a look at the F5522 line of Guhring drills and see if they have anything. I drill 10x diameter through Nitronic 60 with these no problem.

 

C

[SLJ]

CAMmando, the callout is .014 to the datums, and .001 "line bore". Basically, they want it straight to itself, but we've got .014 positional to the datums.

[CAM-mando]

Yeah I saw that you said "to itself" ... talk to your vendor see how good he can get it.

 

Good Luck

[jimspac]

Wire it undersize for location, line ream for size.

[5 AX]

Try drilling it onsize first, reaming titanium or step drilling titanium does not work. Use a carbide drill and run it slow.

[Threept82]

What I do is cobalt stub drill (undersize) with

short pecks to about 3/4 of flute length deep,

end-ream as deep as possible with tool smaller than finish but bigger then stub drill. Next tool

cobalt jobber length drill same size as end-ream......

repeat until thru, then I double ream thru with

carbide reamers.