Re: 1571 (128D) spindle speed adjust?

You'd be surprised how strong the magnet in the motor is, and it's usually closer to the disk than the outside of the flywheel.

Never a problem in my experience and I use it quite a bit; much more convenient than some other approaches IMO.

m

----- Original Message ----- 
From: "Mia Magnusson" <mia@plea.se>
To: <cbm-hackers@musoftware.de>
Sent: Thursday, December 21, 2017 5:57 PM
Subject: Re: 1571 (128D) spindle speed adjust?


> Den Thu, 21 Dec 2017 12:19:30 -0500 skrev "Mike Stein"
> <mhs.stein@gmail.com>:
>> I glued a strobe disk to a refrigerator magnet and stick that on the
>> flywheel of drives under test.
> 
> Magnets seems like a bad idea in a disk drive, unless you have a biiig
> degausser which you can use to degauss almost everything of the drive
> afterwards :)
> 
> But you have the index hole, just wire up a photo sensor (cut the top
> of an old metal case transistor if you don't have anything else at
> hand) and count the number of pulses per time unit.
> 
> -- 
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