Best oil for drilling and tapping

[PatMiles]

Whats your best advice to remove an 8-40 hss tap broke off at an angle below flush? I used it to tap one too many action holes.

SUX!!!

 

[jackson1]

Dusty, A carbide end mill may work. Never had much success with end mills as they do not like interrupted cuts (rough surfaces). Another option depending on the value of the workpiece is a carbon electrode EDM. If you go that route, be sure to shield of the surrounding areas.

 

[Dusty Stevens]

Dusty, A carbide end mill may work. Never had much success with end mills as they do not like interrupted cuts (rough surfaces). Another option depending on the value of the workpiece is a carbon electrode EDM. If you go that route, be sure to shield of the surrounding areas.

The piece is priceless- thats why i havent had it burned out. A walton tap extractor will not work- not only is it stuck (hence the breakage) its broken off at an angle so the fingers break off the extractor.

 

[Dud]

I think you need to post a picture.

It might be possible to turn or grind a single purpose tool to try to grab it and back it out but that's another option of last resort.

Some times you can weld to a broken tap to back it out but this sounds too small for that.

 

[Dusty Stevens]

I think you need to post a picture.

It might be possible to turn or grind a single purpose tool to try to grab it and back it out but that's another option of last resort.

Some times you can weld to a broken tap to back it out but this sounds too small for that.

Ill get a picture soon. But its an 8-40 tap broken off at an angle and the highest part is at least one thread under the surface. Not much to do anything with

 

[Link]

I was told tap oil is not a ''lube'' or slippery. It is a special cutting oil that creates a bite and cools at the same time.

 

[Dud]

Nope, it's a high pressure lubricant, that's why the best stuff has molybdenum in it.

Unless you are using an automatic tapping head (hard) or CNC, I doubt heat would be an issue with tapping unless you were doing it dry.

 

[GNERGY]

I use Cimcool Cimtap 2 it is a thick red liquid that sticks to the tap really well. I use it for tapping anything stainless, slides, muzzle brakes. We had some at work and I bought some for my self.
Tarey