chamfering the tenon hole

timothy thorpe · Post by **timothy thorpe** » Mon Dec 10, 2007 7:13 am

hi guys ,thanks for the help. how come when i chamfer the tenon hole it leaves a ridgid rough looking hole? i thought about the speed on the drill press but i really have know idea.

thanks, tim

hazmat · Post by **hazmat** » Mon Dec 10, 2007 9:02 am

I normally use the same speed I drill with for chamfering the mortise. Never had any problems. I usually just press the stummel against the spinning countersink and it just does what it's supposed to do.

EDIT: Oops... wrong hole, but same thing except I don't manually hold the stem when doing this step. I do this step with the stem chucked up in my Taig. As for the rest, what Kurt says below. I use a single fluted countersink and have had zero problems.

Post by **KurtHuhn** » Mon Dec 10, 2007 11:01 am

This can also be due to the type of countersink you use. I've found that the multi-flute countersinks will leave a rough surface, while the single-flute or O-flute type leave a very smooth finish. It is, as far as I can determine, a function of the angle of the cutting edge and the self-centering ability of the single-flute type.