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Robert Burch
01-15-2003, 04:59 PM
I have seen the L-00 spindle taper given as 8 deg, 17 min, 50 sec. This is the half angle.

I have also seen it given as 7:24 which is 3 1/2 inch per foot. This half angle is 8 deg, 7 min, 48 sec.

Which is correct or is either one close enough?

Peter S
01-15-2003, 07:48 PM
My Pratt Burnerd catalogue says the American Standard Long Taper Key Drive type L spindle nose; L00, L0, L1, L2, L3 spindle are all 8*17'50".

Might find it in Machinery's Handbook too, but, as usual, it isn't listed under anything sensible like "standard spindle", "spindle", "lathe", "chuck" etc.

Robert Burch
01-22-2003, 02:06 PM
Thanks for responding, but that is precisely my question. I have seen reputable sources list it both ways.

Robert Burch
01-29-2003, 09:15 PM
Peter,

Since you were the only one to respond to my posting, this answer is for you.
I hope I didn't add any confusion to any one. But I was all wet with my original question. 8* 17' 50" half angle corresponds exactly with 7/24 included angle taper for the L-00 spindle. What I did wrong was not use the half-angle when I figured the tangents. I should have known better and am red-faced.

Bob