Thread: Wood Screw Chuck Question

5/16"

Originally Posted by artme

I have wood screw chuck that came with my Super Nova scroll chuck.

I want to mount a piece of mango using this. The screw will be going into end grain.

What size hole do I drill to take the screw??

Moit obrigado!!

Hi artme,
I use a 7mm on mine
Moit obrigado to you too! (What ever that means)

Thanks fellas!!!

Moit obrigado is Portuguese for many thanks. Used by Portuguese speakers to say many thanks!

Screw chucks are generally recommended for "cross grained" work pieces and not end grain mounting. A screw chuck mount in end grain is quite weak.

Originally Posted by artme

Thanks fellas!!!

Moit obrigado is Portuguese for many thanks. Used by Portuguese speakers to say many thanks!

I use 8mm, anyway 5/16 is marginally different in size. I eventually broke mine, reason? basically abuse now I have a 20mm dia one

What are you trying to mount? I too wouldn't use one into end grain and maybe there is a better way to mount what you are making?

I was told when I was an apprentice that you should measure the root size of the thread which is the solid metal left at the bottom of the thread. it seems to work ok but some hardwoods need an extra 1 mm added to the drill size

Thanks all for your input!!!

I had thought about the end grain question and was a bit wary.

Neil, I Mounted the mango and roughed it down before asking this question

I started shaping it with the intention of making a lidded box. I was so engrossed
That I began the parting operation before I realized I hadn't thought things out at all

I was going to mount the lid section on the screw chuck to hollow out the inside.
Now I think I will drill a hole in the centre of the lid piece and glue a different piece
of timber in for the knob. This will start as a spigot for me to grip in the scroll chuck.