drill and tap

[petro7]

I am drilling and tapping asp 30 material. 60+ rc.

I,m using osg products.I was able to tap 7 holes 8mm x1.25 18mm deep then my tap broke and the drill needs resharpening. $90. for the drill 170.00 for the tap. have 50 holes to do.the parts are taper shafts 3 feet long . any other products available and a little more reasonable.

[RobertELee]

Carbide drill and thread mill!!

[Ron Branch @ Verisurf]

+ on the Carbide drill and Threadmill.

[Odin]

Mitsubishi carbide drills work real well in hardened materials.

[CNCGUY1999]

i just got done doing a 20 piece jod 1"-8 8 deep. by hand thread mill is neat investment/ lol

[jbreth]

I recommend a NACHI SG drills. They are powdered metal. definatley use a Thread mill. The best I found was CARMEX thread mill called Mini Mill. They are second to none. I have threaded 100 0-80 holes in titanium with one tool. Could have kept going but the job was done.

[petro7]

Unfortunately I can't thread mill this,we are rigit tapping on our lathe,our vertical mill do not have enough travel these bar are over 3 feet long.

[Zoober]

A single or multi point threading bar would have a similar effect to thread milling. That allows you to control the depth of pass similar to a thread mill.