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x39
07-08-2011, 04:44 PM
I just encountered something new to me, a half-round Woodruff type key that is 6mm wide. I need to cut a seat to fit and can't find any reference to metric cutters of this type in MSC, McMaster, etc. Anybody here got a clue where I can find a cutter here in the states? Thanks.

John Stevenson
07-08-2011, 05:08 PM
Can you just replace the keyway with a normal one but 6mm wide ?

I hate woodruff keys although they do earn me some coin, they are too deep and have sharp edges all over which weakens the shaft.

They use then on tapered gears on fork truck motors and they always peel the taper open from the bottom of the woodruff keyway.
I build them up and machine a normal keyway but on the same angle as the taper and they never come back again.

It's only idleness to use a woodruff so you dont have to take the taper into account.

Toolguy
07-08-2011, 05:44 PM
Maybe you could use a 3/16 wide cutter and make 2 cuts to get it to .236. That's not as easy as having one the right width, but can get you where you're going with a little ciphering.

x39
07-08-2011, 06:22 PM
Thanks guys, both excellent suggestions.