Re: Beware of old AntiStatic foam


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Bruce Gentry said:

One reason polyurethane was so popular for drive rollers and belts is
it's traction. Many tape recorders used them because they could be
smaller and cheaper yet able to grip and carry the power. It is
certainly possible to find replacements that will fit, but often they
will slip under heavy load.

Years ago I talked to one of HP's calculator engineers in Oregon and he
told me that they had about given up on building a reliable card reader for
the HP-65 and similar calculators because of slippage, until they
discovered polyurethane. But it said that it gripped so well that they
could dip the magnetic cards in oil and the polyurethane rollers would
still feed them!

Unfortunately the rollers that HP used in all of their calculators have
all deteriorated with age.



On Sun, Mar 21, 2021 at 3:59 PM greenboxmaven via groups.io <ka2ivy=
verizon.net@groups.io> wrote:

One reason polyurethane was so popular for drive rollers and belts is
it's traction. Many tape recorders used them because they could be
smaller and cheaper yet able to grip and carry the power. It is
certainly possible to find replacements that will fit, but often they
will slip under heavy load.

Bruce Gentry, KA2IVY

On 3/21/21 14:26, snapdiode via groups.io wrote:
On Sun, Mar 21, 2021 at 11:06 AM, Bert Haskins wrote:
Yep they used something like this in drive belts also.

Yes my TEAC X-3 just had a "belt melt", it is hard ti understand why
they can't be made in silicone rubber now. That should be practically
eternal in comparison to my lifespan....








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