I'm redoing the drive in my lathe and the final belt drive is of the
timing belt type, 1/2 pitch, 1-1/2 wide. Anyway I need to buy a new
motor pulley and they are available three ways; plain bore, you bore and
broach keyway to needed size, QD style where you buy a hub that fits the
shaft and the pulley, and 'taper lock', pretty much like 'QD' but with
different hub and pulley taper dimensions.

As the lathe is out of commission that makes the interchangeable hub
styles look more attractive. Is there any particular advantage in favor
of 'QD' or taper lock? I'm not particularly well versed in power
transmission but it seems the 'QD' is somewhat more common and is a
couple bucks cheaper than the taper lock style

Any opinions on this would be much appreciated

Regards
Paul
--
-----------------------------------------
It's a Linux world....well, it oughta be.
-----------------------------------------

On Fri, 28 Sep 2007 09:18:14 -0500, Paul wrote:



As the lathe is out of commission that makes the interchangeable hub
styles look more attractive. Is there any particular advantage in favor
of 'QD' or taper lock? I'm not particularly well versed in power
transmission but it seems the 'QD' is somewhat more common and is a
couple bucks cheaper than the taper lock style

Any opinions on this would be much appreciated

QD is a bit more flexible in mounting arrangement since you can get
bushings that have either thru or tapped holes for the draw bolts.
Taper-lock is more compact as the bushing is flush or recessed on the
sides of the pulley. I think the taper-lock looks better for the same
reason.

Because of the interference fit on the shaft, either is far superior
to a bored to size pulley, especially for reversing loads.

--
Ned Simmons

I think the interchangable bushing type pulleys are so the power
transmission shops don't have to carry thousands of pulleys for every
diameter shaft size. They just need one type of pulley and an assortment of
bushings.

Tony

"Paul" wrote in message
. ..
I'm redoing the drive in my lathe and the final belt drive is of the
timing belt type, 1/2 pitch, 1-1/2 wide. Anyway I need to buy a new motor
pulley and they are available three ways; plain bore, you bore and broach
keyway to needed size, QD style where you buy a hub that fits the shaft
and the pulley, and 'taper lock', pretty much like 'QD' but with different
hub and pulley taper dimensions.

As the lathe is out of commission that makes the interchangeable hub
styles look more attractive. Is there any particular advantage in favor
of 'QD' or taper lock? I'm not particularly well versed in power
transmission but it seems the 'QD' is somewhat more common and is a couple
bucks cheaper than the taper lock style

Any opinions on this would be much appreciated

Regards
Paul
--
-----------------------------------------
It's a Linux world....well, it oughta be.
-----------------------------------------

Ned Simmons wrote:


QD is a bit more flexible in mounting arrangement since you can get
bushings that have either thru or tapped holes for the draw bolts.
Taper-lock is more compact as the bushing is flush or recessed on the
sides of the pulley. I think the taper-lock looks better for the same
reason.

Because of the interference fit on the shaft, either is far superior
to a bored to size pulley, especially for reversing loads.


Ned

Thanks for the insight. I think I have located a free QD hub so it
looks like my decision is more or less made for me! Hopefully it will
all fit the motor shaft length.

Paul

--
-----------------------------------------
It's a Linux world....well, it oughta be.
-----------------------------------------