On 3/27/19 4:06 PM, dwight wrote:
> A friend an I did almost the same thing. We used the transformer primary
> from another box as an auto transformer and used a file to grind the
> motor pulley down. We did have to file the mounting slots some as well.
> It worked fine.
> This was about 25 years
From: cctalk on behalf of Chuck Guzis via
cctalk
Sent: Wednesday, March 27, 2019 2:07 PM
To: dwight via cctalk
Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B
On 3/27/19 1:36 PM, dwight via cctalk wrote:
> Most all 8 inch drives were synchronous capacitive p
On 3/27/19 1:36 PM, dwight via cctalk wrote:
> Most all 8 inch drives were synchronous capacitive phased AC motors. That is
> until 3 phase low voltage motors started showing up on 5.25 disk drives.
> The ac motors on the 8 inch drives rarely had jumper options for 120/240V AC.
> Most were fixed
seen that had
a voltage option.
Dwight
From: cctalk on behalf of Charles Dickman via
cctalk
Sent: Wednesday, March 27, 2019 12:58 PM
To: Chuck Guzis; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi
On Sat, Nov 10, 2018 at 3:27 PM Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> One could also take Tony's approach and simply cobble up a
> crystal-controlled 60Hz source for the motor. Shouldn't be too
> difficult--I suspect that the motor doesn't draw more than about 30W.
> If you
, by
the where the belt rides on the pulley.
Dwight
From: cctalk on behalf of Chuck Guzis via
cctalk
Sent: Saturday, November 10, 2018 12:38 PM
To: Fred Cisin via cctalk
Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B
On 11/10/18 12:
On 11/10/18 12:33 PM, Fred Cisin via cctalk wrote:
>>> He needs a larger pulley if going from 60 to 50 ( as a motor pulley
>>> ). It needs to be 20% bigger because the motor turns slower on 50 Hz.
>>> 6/5 to be exact.
> On Sat, 10 Nov 2018, Chuck Guzis via cctalk wrote:
>> No argument there--but
He needs a larger pulley if going from 60 to 50 ( as a motor pulley ).
It needs to be 20% bigger because the motor turns slower on 50 Hz. 6/5
to be exact.
On Sat, 10 Nov 2018, Chuck Guzis via cctalk wrote:
No argument there--but the size increment is pretty small. Consider
that a typical
On 11/10/18 11:42 AM, dwight via cctalk wrote:
> He needs a larger pulley if going from 60 to 50 ( as a motor pulley ). It
> needs to be 20% bigger because the motor turns slower on 50 Hz. 6/5 to be
> exact.
> Dwight
No argument there--but the size increment is pretty small. Consider
that a
On Sat, Nov 10, 2018 at 7:42 PM dwight via cctalk wrote:
>
> He needs a larger pulley if going from 60 to 50 ( as a motor pulley ). It
> needs to be 20% bigger because the motor turns slower on 50 Hz. 6/5 to be
> exact.
I like the way Tektronix handled this issue in the 8560 (service manual on
To: dwight via cctalk
Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B
On 11/10/18 7:55 AM, dwight via cctalk wrote:
> 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 frien
On 11/10/18 7:55 AM, dwight via cctalk wrote:
> 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
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 a
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?
Guy
At 01:03 PM 10/11/2018 +, Riesen Thomas wrote:
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