Subject: Re: [sloan-25mlog 3741] 2.5m obslog 20171031 (SJD 58058)
From: John Downey
Date: Wed, 1 Nov 2017 09:34:40 -0600
>=20
> * Adjusted the light curtain (tapped on the mirror observer side, but
> opened interior door worked) to get the scissor lift to move. Some =
shaking of
> the lift as it descended slowly and incrementally. Light curtain may =
need to be
> tweaked for the colder night temperatures.
The shaking behavior is the result of the mirror position being on the =
edge of the light curtain's working zone.  We had hoped that the more =
solid adjustment would prevent the need to adjust seasonally, but it =
looks like that is not the case.
Bill adjusted the mirror's this morning, and we'll do so again if needed =
as it was a bit warmer this morning than would be ideal for an =
adjustment going in to winter.
For the longer term, we're looking at building new mirror mounts out of =
something more temperature stable than aluminum.  Those might be ready =
to install in December or a bit later.
John=