Re: [APML] S-tupifying T-axing V-ague

[Matt BenDaniel <matt@exceloncorp.com>]

At 01:30 PM 2/27/01 -0500, warren and amy keller wrote:
>Hey Matt,
>                  How are you?
>
> > I think 15 seconds is the minimum amount of time to reliably calibrate at
>0.5x.
>GOOD TO HEAR THAT. ARE YOU SAYING YOU CALIBRATING AT .5x?

Warren,

I usually use 0.5x for calibration/guiding on my GM-8.

With the STV, you should calibrate and guide at the same rate.
The STV has the aggressiveness parameter to work with.

> > 1. Balance very carefully, especially in DEC.
>SLIGHTLY MIRROR HEAVY
>Weight RA heavier on the East side.
>ALWAYS
> > 2. Tighten clutch knobs moderately.
>EXPAND ON THIS, HAND FIRM BUT NOT TORQUED?

I think you need to experiment with your mount, because each mount has subtle differences.
If the clutch is too loose, there will be slippage and possible misalignment.
If the clutch is too tight, it could also misalign the parts and cause binding.
John Boudreau could tell you more about this.

> > 3. Adjust backlash well.  Use a bit of TVC to take up backlash in DEC.
>INTERESTING, THE BARBER ADVIVE AND A FEW OTHERS HAD ME AT NO TVC THOUGH
>SCOTT L SAYS 3-6 FOR MANUAL GUIDES.

The majority of Losmandy mounts I know about need to have a slight amount of backlash in 
DEC.
If the DEC has no backlash, you usually get overshoot, which really screws up the guiding.
The TVC does a good job compensating for a slight amount of backlash, and you should use 
it.
I think Scott's "3-6" is what most people (including myself) use.

The RA can have even more backlash, as it never changes direction when guiding at 2x or 
0.5x.


>Let's Talk s'more,
>                                Warren


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