Hey Clark,
I've never seen such a thing (
/g/TekScopes/album?id=301415),
how strange. I wonder if anyone here knows what sort of plastic Tek used
for these?
I've never looked closely at one of those drums, but it looks to me that it
would be relatively straightforward to 3D print a replacement nowadays.
I've recently dusted off my 2nd hand Prusa, so now everything looks like a
nail to me :). The commercial sintering services should be able to produce
a better part than the original. Even a lowly FDM printer should be able to
produce a usable part, though perhaps a little bit of beveling would be
necessary to avoid sharp overhangs.
The problem would be to produce the CAD design, maybe I'll go see if I have
something to play with in my box of mystery modules...
Siggi
On Sat, Mar 22, 2025 at 8:29?PM Clark Foley via groups.io <clarkfoley=
msn.com@groups.io> wrote:
I recently acquired a PG502 from Tek surplus (aka Country Store) and found
several setting to be intermittent. Expecting that a good cleaning would be
in order, I was astonished to find that cam switch drum appears to be
decomposing. It looks dull, powdery and parched like mud flats after a
dessert gully washer!
In fact, there was a lot of fine debris on the contact board. Cleaning the
board and the contacts made no difference because the cam lobes are
deteriorating. I have not touched the cam drum with any cleaner or other
chemicals.
This unit was used in the production test area; perhaps its entire life.
It was last cal’d June 2022. Perhaps it is the result of 45 years of
continuous up time in a rack.
I have never seen a cam drum look like this.
Has anyone seen such a thing?
(See photo gallery for “Decomposing Cam Switch Drum.”)
