Tapping hardened material

[cqualls]

I need to tap 4 holes in 1050 steel hardened to 60RC. Its a left hand M8x1-6H has to go 22mm deep and is a thru hole. The job has to be done by the 9/20, does anyone have a source to get taps or thread mills overnight to do this job?

I am also looking into having this burned in.

Thanks,

[Rick46]

try burning the threads with a CNC edm with thread electrodes.. Im not sure as to where you get them most likely a carbon dealer.. HTH

[Hardmill]

Because of your lack of time burning would be the way

to go since theres only 4 holes.

Dont want to try and educate yourself on thread milling

when your watching the clock. Especially in hardened steel.

 

 

PEACE

[HevyMetl]

Burn baby burn on this one. You length to diameter aspect is getting a little longfor that corse of a thread mill. You would probably expierence a little taper.

[cqualls]

I've done quite a bit of thread milling in the past the problem is at 60Rc it questionable rather or not a thread mill can do it and with the depth of thread I would have to relieve the shank of the thread mill for clearance. Osg believes you could probably get 2 holes/mill with their thread mills. I'm trying to find a local source to burn these but not having a lot of luck so far.

[terry5357]

cqualls.....don't be shy. find a place that does that kind of work (EDM) overnight there, and overnight back. Explain situation, pay the extra bucks (the burn will not take long, maybe an hour for all 4 holes) and overnight back. I'm assuming this is in the "A" or "B" side core and cavity. If you jump on it right now, you may end up being only a day late. Be nice when you talk to EDM shop........offer extra $'s in earliest part of conversation. $ talks and B*ll Sh*t walks

 

good luck

[cqualls]

This actually in the end of some small shafts. I am no longer in the injection mold industry. I went to work for Borg Warner in Sallisaw, OK and am now doing prototype work for the automotive industry, quite a change from mold work. I've been here since the end of May and am liking it. The work is easier, especially the Mastercam programming mostly 2d work.

I still do contract work for the company I quit, both design and programming.

I found a company that could burn the threads and get them back to us in the time needed and yes we are paying extra for the quick delivery. Thanks for the help.

[SaltyAcres]

OSG. corp, Has taps to cut harden steels up to 7070Rc,

[Oppiz]

Possibly you could drill the hole with carbide, press fit a soft plug, then tap the plug????

[Salt4cad]

Yes if you pin it comething called a duchman