10 Apr
2012
10 Apr
'12
12:02 p.m.
On Mon, Apr 9, 2012 at 2:03 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I don;t rememebr that, but it;'s been some time since I worked on one. I
don't recall there being any shims in my unit either.
And I can't really see the need. Provided the disk hub doen't move
relative to the spindle (they are matneitclaly locked together, like in a
normal RK05), the tracks will stay in the smae places on the disk so
there'll be no problems reading/wriging then.
I wonder if you're thinking fo the trick of adding a small ship to the
hole of a low-density alignment pack to let it be used in high density
drives. I think that's in one of the RK05 manuals.
I have one. It's very much the same as a
normal RK05J, but without the
door,pack holder. The disk pack is fiotted when the drive is built and
held down by a couple of tension srings. It still ahs only one disk and 2
heads, but has twice as many cylinders as a noraml RK05. The fact that
the back is not normally removed emans that any slight run-out in the
spindle is not important, since the disk will be in the same position for
formatting, writing and reading.
Yep. IIRC, you are also expected to shim the pack in the hub to
minimize runout and/or wobble. I assume the
positioner graticule is differnet too, but I've never
investigated that. IIRC the electorncis is the later RK05J stuff, but
with link changes.
I don't think the positioner graticule is different, but there are
jumpers to set on the cards for J vs F if I'm remembering correctly. If that's so, then the number of ticks/slits is
not likely a 1-1 map
of tracks. It must be a higher density that's divided by selectable
factors.
I thought it was one cycle of the graticule signls for each cylinder in a
normal RK05. In which case there mush be some changes for the RK05F.
I really can't rememebr... I'll look at the prints sometime and check.
-tony