27 Jan
2014
27 Jan
'14
11:33 a.m.
On 01/27/2014 08:35 AM, dwight wrote:
Many of the analog ones were made with two
tones. One would be 1 cycle off per revolution.
The space between the two tones would be the center
of the tracks.
That would be with very special equipment. Don't most ordinary floppy
heads feature tunnel erase?
No need to make an eccentric spindle.
If you want to make an eccentric, it is easy
if you saw the end off and make a center hole
slightly large and connect it back tot he spindle
with a screw.
I suspect something a lot more simple could be done. Consider that a
radial alignment of +/- 1 mil is considered to be "good enough" and that
the thickness of a piece of 20 lb. letter paper is 9 mils. One might
even give the spindle a couple of lateral taps with a small hammer to
achieve that level of eccentricity.
--Chuck