50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

[Jim Manley]

Hi Jos,

Thanks very much for posting about the NinjaFlex material.  That will come
in very handy as my students design robotic parts, although I'm sure it
won't be long before custom-made "rubber" bands will be flying around the
lab, and new-fangled slingshots ("wrist rockets") won't be far behind those
... heavy sigh.  "You'll shoot yer eye out, kid!"

I loved listening to Jean Shepherd on the radio as a kid, spinning yarns
from his own childhood, including his obsession with acquiring a Red Ryder
BB gun from the Big Ol' Fat Guy in the Red Suit.  He eventually
consolidated many of his best tales into the movie script for, and
narrated, "A Christmas Story", which is now mandatory holiday watching in
our house.

All the Best,
Jim


On Wed, Mar 27, 2019 at 10:27 AM jos via cctalk <cctalk at classiccmp.org>
wrote:

> On 10.11.18 13:03, Riesen Thomas via cctalk wrote:
> > Hi all
> >
> > Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive
> > Mitsubishi M2894-63B?
> >
> > If there also the appropriate ribbon gummies available, I would be very
> > happy.
> >
> > Regards
> > Thomas
> >
>
>
> Thomas's floppydrive is currently on my bench : as we were unable to find
> the rights parts I proceeded to 3D print them.
> A sleeve for the existing 60 Hz pulley was made from PLA, a replacement
> belt was printed using "Ninjaflex".
>
> The resulting combination is already running for several hours, the belt
> is as flexible as the original and shows no signs of wear yet.
>
> ( This particular drive has the distinction of using a true rubber belt,
> not the reinforced textile band you normally see )
>
> This ninjaflex  material could potentially be very useful in producing
> capstans....
> Experiments will follow as soon as time permits !
>
> Jos
>