Countersinking Ti ???

[plas62]

I'm working on my first linerlock and this morning was trying to countersink the .055" Ti liners using a Toolmex #0 HSS 82° Zero Flute countersink.

I tried running it at 1180 rpm with cutting oil and almost completely countersunk one hole before burning up the bit. It was a double ended countersink, so I flipped it over changed to 670 rpm and tried to complete the hole I had started. I could see it start to smoke, so I stopped before completely burning up the bit this time, it did not appear to be cutting at all.

I either have the wrong tool or am using the wrong feed & speed or both. Any help or advise would be greatly appreciate.

Thanks



http://www.toolmex.com/Products/custom/TechDetails.aspx?itemid=5-652-8200

 

[12345678910]

What's the size of the hole ?

 

[plas62]

Clearance hole for 2-56 screw. I'm using a#44 (.086").

 

[Daniel Fairly Knives]

Try the slowest rpm you can, I use about 100 rpm at the most for countersinking Titanium. Sharp HSS should do the trick. Single flute chamfer bits work better, carbide is nice but not needed.

Use plenty of feed pressure, sharp bits and slow speed.

 

[plas62]

Thanks Daniel, I'll try that.