Work hardened SS

Romoshka

Romoshka

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Nov 11, 2022
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Modifying a digital caliper to made a poor man’s DRO on my tail stock. Dremel cut off wheel to remove the OD & ID “ears”. In attempting to drill a single clearance hole it stopped half way. I wonder if the heat from the cutoff operation contributed to the problem. So now I have a piece of work hardened SS and my question is: what if any technique can I employ to finish this hole.
 
Karl_T said:
My vote is for a carbide mill drill.

www.zoro.com

MELIN TOOL COMPANY Carbide Drill Mill 60Deg 1/16X3/16, Number of Flutes: 2 (AMG-402-DP60-ALTIN) | Zoro

Order Melin Tool Co Carbide Drill Mill 60Deg 1/16X3/16, Number of Flutes: 2, AMG-402-DP60-ALTIN at Zoro.com. Great prices & free shipping on orders over $50 when you sign in or sign up for an account.
www.zoro.com www.zoro.com

comes in more sizes. Works way better than a carbide end mill. Will work if the cobalt drill failed.
Click to expand...
I like this tool. Thanks for showing me. I wasn’t aware of it though I do have one (too large) I acquired in an auction lot. To get clearance for the intended 4mm screw I’ll need a 3/16 drill mill. So in searching the site you provided I see they come in 60, 80 and 90deg tips. Which angle point do you recommend?
 
I have always used the 90...

Not sure its best, just works for me and if its not broke, i don't fix it.
 
Karl_T said:
I have always used the 90...

Not sure its best, just works for me and if its not broke, i don't fix it.
Click to expand...
Having no experience with carbide drilling do you recommend thin or regular viscosity cutting oil?
 
There again, I have just one can of high sulfer cutting oil. Bought it YEARS ago. works for me.
 
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