Interesting indeed; that explains why the two tiny nylon gears in almost every one of the small plotters based on the little Alps unit (Radio Shack, Commodore, Atari etc.) have split...
m ----- Original Message ----- From: "Chuck Guzis" <ccl...@sydex.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk@classiccmp.org> Sent: Monday, March 21, 2016 7:37 PM Subject: Re: Restoring Nylon parts (like the card guides in a PDP-8a chassis) > On 03/21/2016 04:25 PM, Jules Richardson wrote: > >> Interesting... so boiling them can make them expand too much, leaving >> them for a few weeks will allow them to contract, but they >> "remember" their manufactured size, such that a few weeks after they >> they aren't trying to return to their shrunken, pre-boiled state? > > Interesting. If water evaporation accounts for the dimensional > instability, why not use something that doesn't evaporate quite as > easily? Say, ethylene glycol or a silicon oil? > > --Chuck >
