how sloppy are speed tolerences in QIC drives

[Allison]

>
>Subject: how sloppy are speed tolerences in QIC drives
>   From: compoobah at valleyimplants.com
>   Date: Sat, 12 Nov 2005 13:36:17 -0600
>     To: <cctalk at classiccmp.org>
>
>I'm trying the vinyl tubing approach in replacing the drive roller, since it sounds like it would be difficult to slide in a different QIC drive when I need to use tape (no one suggested tips on that). How "sloppy" can the drive roller dimensions be? is there a feedback loop for speed regulation that interfaces directly to the tape, or does it rely soley on the stepper motor and parts dimensions? I think I'm about 1/32" too large, but it could be bigger, since it's hard to measure goo, not more than 1/8th, though.=0D=0A=0D=0A 

Well, the TU58 servos off the motor and I found it tolerent of at least 1/16"
variation.

If the drive servos of the data then tolerences are far greater.

Allison