HP-85 belts/Capstan repair

[Anthony Eros]

Michael -

I was part of the HP-85 belt group buy (5 sets,) but I can't find your note
with the total owed and mailing address to send payment.  Would you please
resend the info to me?

Thanks!

-- Tony Eros
   2105 Anson Road
   Wilmington, DE  19810

	-----Original Message-----
	From:	Michael Grigoni [SMTP:msg at computerpro.com]
	Sent:	Monday, March 08, 1999 3:46 PM
	To:	Discussion re-collecting of classic computers
	Subject:	HP-85 belts/Capstan repair

	Greetings to all:

	Since I've been absent for about a week, 800 messages have piled-up
	from the list; reviewing them will take awhile so I'm posting this
	to report on the HP-85 belt/capstan issues status globally.

	The belts have arrived and are being mailed-out early this week.  I
	installed a set in our HP-85 and they work well.

	I tried a new approach to capstan repair which I find works very
well.
	Clean the capstan of old rubber down to a minimal amount of residue
	with isopropyl.  Obtain a can of dipping vinyl (for coating tool
	handles, etc.); most hardware stores should have it.  Remove the
	capstan/encoder wheel ass'y from the motor shaft.  Prepare the
	vinyl properly according to directions with the product.  Dip the
	capstan (inverted) at the rate of about 5 seconds for its length,
	being careful to just dip just above the bottom rim of the capstan
	wheel so that the vinyl creates an overlap of 90 degrees.  Withdraw
	the part at the same rate as insertion.  Immediately invert the
	part and place on a level surface in a warm place to dry for four
	hours.  During the drying time you will note that any vertical 
	asymmetry evens out.  Repeat with another dip and 4 hour dry.

	The results were very good and tests with an old tape containing
	an 84 record program produced no errors (reading or writing).

	Attached is a small jpg which gives an idea of the appearance of the
	results (max mag. avail with the camera lens).

	Michael Grigoni
	Cybertheque Museum << File: CAPSTAN2.JPG >>