#### Re: Effect of temperature on backlash

Joe Zeglinski

How about using the +6v port? Plug in an audio cable and measure the voltage
at it's pigtail (or use an unwired audio jack and use it's tangs. I assume it
is tapped off the main 12V input, and might be representative of the cable
power coming in.

Joe

----- Original Message -----
From: "Howard" <howard@astro-physics.com>
To: <ap-gto@yahoogroups.com>
Sent: Friday, November 02, 2007 7:46 PM
Subject: RE: [ap-gto] Effect of temperature on backlash

Here's a 12 volt test point: On your GTOCPx control box; on the five
pin receptacle for the keypad's plug; number 2 is negative and number
4 is positive. The pin numbers are visible on the receptacle itself.
You may need to rig up some thinner lead probes, but I have even gotten
accurate enough readings with two paper clips inserted into the
receptacle.

Mag. 7 skies!

Howard Hedlund

Astro-Physics, Inc.

815-282-1513

________________________________

From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf
Of Richard Seavey
Sent: Friday, November 02, 2007 6:27 PM
To: ap-gto@yahoogroups.com
Subject: RE: [ap-gto] Effect of temperature on backlash

Steve
I did measure the voltage and it was about 12.8 Volts under a slewing
But that reminds me of something else. I would find it very useful if
there were a 12 volt test point available on the mount so that the
actual
mount voltage could be measured. I don't know of an easy way to measure
the
mount voltage on the mount side of the power connector. Measuring at
that
point is important because that power connector can sometimes fit
loosely
which adds resistance with the attending voltage drop.

Richard

At 06:00 PM 11/2/2007 -0400, you wrote:

And voltage drop may be an issue for a long run. The only way to know
for
sure is to take a reading at the mount end.

Steve

_____

From: <mailto:ap-gto%40yahoogroups.com>ap-gto@yahoogroups.com
<mailto:ap-gto%40yahoogroups.com>
[mailto:ap-gto@yahoogroups.com <mailto:ap-gto%40yahoogroups.com> ] On
Behalf Of
<mailto:chris1011%40aol.com>chris1011@aol.com
<mailto:chris1011%40aol.com>
Sent: Friday, November 02, 2007 3:51 PM
To: <mailto:ap-gto%40yahoogroups.com>ap-gto@yahoogroups.com
<mailto:ap-gto%40yahoogroups.com>
Subject: Re: [ap-gto] Effect of temperature on backlash

In a message dated 11/2/2007 2:34:57 PM Central Daylight Time,
reseavey@verizon. <mailto:reseavey%40verizon.net> net writes:

The following, winter when the temperature was about 5F, the
engagement of

the RA worm and worm wheel seemed to be much tighter; in fact I had
to
re-adjust the worm mesh so that the RA motor wouldn't make strange
noises
while slewing.
I think you might have seen the effect of thickening of the grease, not
worm

mesh.

Rolando

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