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Parallax 250 HD Installed and Working!

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#26 Mike Clemens

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Posted 11 March 2011 - 07:00 PM

> Any suggestions?

It's an AP goto system right? it will use Ray Gralaks AP ASCOM driver and the upcoming APCC software. If so, a pointing model is being built into that.

#27 dothead

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Posted 11 March 2011 - 10:12 PM

Hey Jeff,

re flexture - what's the wall thickness of the (aluminium?) tube ?


Ralph

#28 Awesomelenny

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Posted 12 March 2011 - 12:43 AM

OHHHH MY GOD!!!!! That looks so much like a GRAND UNITRON!!!

DO I LOVE that setup you have! WOW WOW WOW!!!

I really am looking forward to your report on the performance and tracking accuracy of this mount/telescope combination.

(aveman...sorry but this one looks much NICER than your pearlescent 9 inch Unipons!

#29 Jeff B

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Posted 14 March 2011 - 09:03 PM

> Any suggestions?

It's an AP goto system right? it will use Ray Gralaks AP ASCOM driver and the upcoming APCC software. If so, a pointing model is being built into that.


Well I actually had some good weather in the daylight to spend some time getting used to the operating system. Kept screwing it up for a while but I eventually got a good sync on the moon and did some manual slewing around at 600X to check balance and the adjusted worm-to-gear tweak to reduce backlash. I then go-to'd back to the Moon and it went right back to where I started. So I'm encouraged so far but I need to do a 2 star drift alignment when the weather permits. :foreheadslap:

The mount is at least as stable as the Byers Series II. As RA is always drive there is very rapid damping on that axis, ~ one highly damped back-forth cycle after a nudge. Damping in the DEC depends highly on the balance on that axis. Since the worm is not constantly driven, if it's out of balance by much, it will still "bounce" a bit after a tap due to the residual backlash, which is now very small, but you still need some for proper running clearance. If the tube is well balance though, things dampen very quickly as there is no bounce. It's all no worse than the Byers Series II and in some orientations, better, plus it has go-to, something the Byers does and cannot have with the tangent arm DEC.

BTW, talked to AP today and their hoping to get the new chip out which contains the modeling in 2-3 months. But I know how things work in Beta testing so go-figure go-to in 3-4 months.

Jeff






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