Drill bit size for Super Nova screw?

[Alan Tolchinsky]

Hi All,

I can't find in my Super Nova manual the size drill bit you're supposed to use with the large "screw" that goes into the chuck for mounting bowls. Anybody know this? Thanks!

[Paul Atkins]

Measure the diameter of the screw below the threads or the solid part. That should give you the size for hard wood. You might need a smaller hole for soft woods to get a little compression in addition to the thread grip.

[Steve Schlumpf]

Page 10 of the on-line manual states a 5/16" hole should be drilled for use with the woodworm screw.

Here is the manual:
http://www.teknatool.com/products/Chucks/Super_Nova/downloads/Supernova%20manual_120603.pdf

Here is the text:

PREPARATION: The 10.5mm thread requires a drilled hole about 8mm (5/16”) in diameter. The screw has considerable holding power and it is sometimes difficult to unscrew, so wax or oil the thread before mounting the wood.

[Alan Tolchinsky]

Thanks so much guys. I was using a 3/8" bit and not getting good results. I guess I know why now. Have a great day!

[Dolan Brown]

I used 5/16" for the harder wood and 1/4" for soft wood (especially if it is green wood).