Replace roller rubber on HP 9825 tape drive

[Dwight K. Elvey]

>From: ard at p850ug1.demon.co.uk
>
>> 
>>    The really ingenous part is that the belt attempts to rotate the take up
>> spool about 10% faster then the other spool. That's what tightens up the
>> tape if it ever gets slack.
>
>How does that work? All points on the belt move with the same speed, the 
>belt drives the outside of the 2 spools, so the surface speed of the 
>spools must be the same. That's the tape speed. I don't see how it can 
>move the tape faster on the takeup side.
>
>-tony
>

Hi
 I'm not sure how it works. The 10% number is not even
close. It is more like 0.5% or so. It does take up slack
over time. I think it has to do with the stretch of the
belt. There is more tention on one spool than the other,
making one side move a little faster than the other.
The one spool getting the more stretched belt would tend
to move a little faster than the side without stretch on
it since it would see more effective belt movement.
Dwight