- [OT] Calibrating an auto level? - 4 Updates
| "pfjw@aol.com" <peterwieck33@gmail.com>: Dec 23 12:02PM -0800 On Sunday, December 23, 2018 at 11:40:48 AM UTC-5, N_Cook wrote: > and then make final adjustemnt by varying the finger-tightness of torque > to the opposing set screw, before a dot of laquer. > . Make sure everything is temperature-stabilized prior to making adjustments (but you knew this already). Again, back in the day, the instruments lived in the back of the truck, not the cab, so they were pretty much always at ambient. Peter Wieck Melrose Park, PA |
| N_Cook <diverse@tcp.co.uk>: Dec 23 09:23PM > Make sure everything is temperature-stabilized prior to making adjustments (but you knew this already). Again, back in the day, the instruments lived in the back of the truck, not the cab, so they were pretty much always at ambient. > Peter Wieck > Melrose Park, PA For something that is maybe 55 years old, amazing it works as well as it does, thinking corrossion products/dust getting in the narrow confines of the damper. The original specification of these things was +/-1mm at 1km, which I find hard to believe. Before the days of laser spots on the distant target, I'd have thought well beyond the resolution of even the youngest eyes even with the most contrasty target possible. |
| Tim R <timothy42b@aol.com>: Dec 23 02:43PM -0800 On Friday, December 21, 2018 at 9:46:26 AM UTC-5, N_Cook wrote: > see how this adjusment mount is constrained, or not. Hopefully no > threadlock on the set-screws or if there is, then overcome wiht a few > seconds of soldering iron. And lasers will bend, if sufficient temperature gradient over the distance is there. |
| N_Cook <diverse@tcp.co.uk>: Dec 24 03:57PM On 23/12/2018 22:43, Tim R wrote: >> threadlock on the set-screws or if there is, then overcome wiht a few >> seconds of soldering iron. > And lasers will bend, if sufficient temperature gradient over the distance is there. It relies on ,seemingly, uniform gravity in the locality , the sort of thing the GRACE satellite measures deviations of. I tried waving a 4Kg lump of lead near the pendulum housing, but no image movement seen. Next time of an outing with it I'll try waving a speaker magnet near it. |
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