Documation TM200 card reader - pinch roller restoration

[Mattis Lind]

Den tis 16 okt. 2018 kl 11:52 skrev Guy Dunphy via cctalk <
cctalk at classiccmp.org>:

> Previously: Manual for Documation TM200 punched card reader
>
> Restoration of the mechanics of my TM200 punch card reader progresses.
> There's a writeup here:
> http://everist.org/NobLog/20180922_data_in_holes.htm#tm200
>
> Currently I'm machining a mold to cast new pinch rollers - and there's the
> rub (ok kill me.)
> The old rubber rollers were decayed to gunk, so there's no chance of
> measuring their original dimensions.
> From the mechanics, if they were just touching the steel capstan rollers
> they'd have been 27.1 mm Dia.
> The mechanics has no adjustment or spring tension on the pinch roller
> positions. Their shafts are in fixed
> position, so all the spring is in the rubber of the rollers.
>

My hardened rubber rollers in my M200 measure 26.8 mm.

/Mattis