The Woodshop Shed

3/5 of an inch forstner bit?

Furnished content.
(from WoodNet.net)


I found a forstner bit on amazon that was listed as 3/5 but it's actually a 15mm bit.

3/5 or 0.6 inches is closer to 15.24mm

Why you may ask do I want a 3/5 inch forstner bit.
I am making a copy of the base of a bentwood case for a singer sewing machine, and the hinges that they used were 0.6 inch or 3/5
And need couple holes in the back of the case that are right around 0.6 inch.

15mm is to small and 16mm is too big.

I did try to grind a 16mm steelbit down to 15.24 and it was enough that it took most of the teeth off the forstner bit.

I also have ordered a 16mm carbide bit, and am going to try grinding the carbide down a little bit to get to the 15.24 or 15.25mm diameter.

Anyone have any other suggestions on how to get a good flat bottomed hole other than the above?

Thanks in advance.

Duke

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