Typically, both the motor pulley and belt are changed as a set to keep the distance from
motor to flywheel the same.
In my younger days, a friend and I ground down a motor pulley, on a 50 Hz Shugart 800, to
be a 60 Hz. We used a file while the motor ran. After getting the right size, we had to
file mounting holes for the motor to keep the same belt. It was not the best way but we
couldn't afford a new drive and we got the drive cheap, from surplus.
If you change the flywheel, the distance will be to great to use the same belt or even
close to the same belt. It may not even fit in the area allowed for the flywheel.
According to the manual, for this drive, only the motor pulley needs to be changed as
there is enough adjustment to use the same belt.
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Guy Dunphy via cctalk
<cctalk at classiccmp.org>
Sent: Saturday, November 10, 2018 6:19 AM
To: Riesen Thomas; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B
Ok. Those are quite small. So you have one? Or those are not yours?
If you have one, and a way to accurately measure it, making more will be easy for anyone
with a lathe.
I could do it, but surely you can find a machinist closer to home?
At 01:03 PM 10/11/2018 +0000, Riesen Thomas wrote:
I am looking for small motor pulley ... see pic ...
Von: Guy Dunphy [mailto:guykd at optusnet.com.au]
Gesendet: Samstag, 10. November 2018 13:25
An: Riesen Thomas <thomas.riesen at predata.ch>; General Discussion: On-Topic and
Off-Topic Posts <cctalk at classiccmp.org>
Betreff: Re: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B
At 12:03 PM 10/11/2018 +0000, you wrote:
Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive
If there also the appropriate ribbon gummies available, I would be very
Do you know what they look like, and the dimensions?
Because I have these. http://everist.org/pics/misc/IMG_1655_pulley_800.jpg
_Maybe_ they were off Mitsubishi drives, not sure. Had them in a box of floppy drive
related bits for a loooong time, and have no recollection of where they came from.
These are 49.0 mm OD, hole 4.7 mm dia. And this is Australia, with 50Hz mains.
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