I'm making some arbores for a Max spindle sander. Need to internally thread for a 3/4" -16tpi "nut."
After a failure at making a o-1 tool and attempting to heat treat, I found a dull 1/2" two flute router bit in my Junk collection.
I milled away the steel from behind the carbide that I wanted to remove. Then just broke the carbide away.
On the tool & cutter grinder I reduced the diameter for clearance and ground the carbide tip with a diamond wheel.
I got a good 60 degree on the end but had to do the inside angle free hand. Got enough back relief and compared to a fishtail gage. Looked OK.
Drilled, bored & knurled a piece of steel for the nut. Set the gears for 16 tpi and it worked.
After a failure at making a o-1 tool and attempting to heat treat, I found a dull 1/2" two flute router bit in my Junk collection.
I milled away the steel from behind the carbide that I wanted to remove. Then just broke the carbide away.
On the tool & cutter grinder I reduced the diameter for clearance and ground the carbide tip with a diamond wheel.
I got a good 60 degree on the end but had to do the inside angle free hand. Got enough back relief and compared to a fishtail gage. Looked OK.
Drilled, bored & knurled a piece of steel for the nut. Set the gears for 16 tpi and it worked.