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Browning taper bushing. Need some math help

W

Wardner

Well-known Member
Browning's tech data says the taper on their QD style pulley/sprocket bushing is 3/4" of an inch per foot. I need to convert that to a rotary measurement (degrees) so I can set the compound feed on my lathe. I want to cut that taper on a pulley (bore) I have. Can somebody help me on this? Thanks.
 
Being sleep-deprived, lazy, and FAR removed from what trig I did study in the distant past, I cheated and used the on-line calculator linked below and came up with about 3.58º.

It will be interesting to see what the math WIZZES come up with!
calculator
 
The angle you need is "angle from the centerline", or 1/2 the "total cone angle". (The figure the other guy and I came up with.)

"3/4" per foot on dia is the standard, and it is 1.78991061° off C/L."
Source
 
That's a Big Fred engineering question on Tales.

Your 3/4 inch per foot is 3 inches in 48 inches or .015625 which works out to a 6.25% grade or 1.555171 degrees.

Someone smarter thasn I am may want to correct my math or trig or whatever it is.
 
Thanks guys.

As I pushed the "post" button, I thought to myself "I sure hope I get an answer today". To make time fly, I put some rice on low speed on the stove, and settled in for a nap. Yep, the rice did burn a bit but I think it was what work me up.

Doesn't matter about the rice, I can now go back to work with the right answer. Thanks again.
 
3.58 degrees is the answer for setting the compound on the lathe.
.75 / 12 = XXXXX then inv. Tangent = 3.58 deg.
 
Since there is no way you can set the angle close enough by the cross feed index, what you have to do is mount the taper bushing on a mandrill and make it run true with your dial gauge or wiggler. Then turn the cross feed to the forecast angle and refine it with the dial gauge or wiggler until it matches the slope of the taper bushing. Then mount your pulley and bore it.

Gerald J.
 
i will assume you have a indicator or two. set one at a right/angle the the compoud. set the #2 indicator at the back the compound.true the compound in 1" the right/angle should move .o325". ajust the compound till you get this. +-.005 will be fine or get a 3/4 pipe reamer. same thing.
 
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