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Equipment Discussions >> Classic Telescopes

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actionhac
Post Laureate
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Reged: 08/09/08

Loc: Seattle
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: pjac]
      #5584889 - 12/22/12 11:40 PM

Quote:

Quote:

... The U joint coupler must be a tight connection, any slop would mean poor response when moving between Forward and Reverse, you want zero backlash. The 1603EF has no backlash in it's gear train and actually a well made unit.
It's surprisingly easy to hit best focus and make small precise corrections with the R and F buttons.

Robert



That's the only thing I'm considering tweaking for using the 1603EF motor on my SkyWatcher - the spokes on my focus knob give a couple of millimetre's slack meaning fine control F/R suffers from a delay when switching direction. That's what you meant by "slop" I assume Robert? When it stops raining, I'll try it as is, but a tighter fit shouldn't be too hard to improvise...




Yes no slop. Because you are shifting forward and backward hunting for a sharp focus. You will overshoot and back up sometimes and you will find slop is intolerable. Once you get the hang of it you can zoom on in and nail it first try, and that's a great feeling, especially at extreme high power.
The motor's tines, where they to plug into the focuser knob should be coupled tightly. Possibly silicon tubing on the "U" tines where they plug into the knob recesses, so everything is tight.

Robert


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dgreyson
professor emeritus
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Reged: 11/06/12

Loc: South Carolina
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: actionhac]
      #5585043 - 12/23/12 02:25 AM

Ive seen those focusers for sale before but alwats wondered if they were worth the bother.

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Karl Fabian
super member
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Reged: 11/02/11

Loc: Illinois
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: dgreyson]
      #5593009 - 12/28/12 05:37 PM

Adapted one of those Tasco 1603 units to my Meade DS2090AT-TC about a year ago. Before the mod focusing at anything over 100x was hit or miss. I simply replaced the focus knob with rectangular flat stock and remounted the entire assembly on aluminum bar stock to line things up.

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Karl Fabian
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Reged: 11/02/11

Loc: Illinois
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: Karl Fabian]
      #5593042 - 12/28/12 05:55 PM Attachment (22 downloads)

Here it is mounted up.

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Karl Fabian
super member
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Reged: 11/02/11

Loc: Illinois
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: Karl Fabian]
      #5593055 - 12/28/12 06:03 PM Attachment (20 downloads)

The square plate to take the place of focus knob.

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Karl Fabian
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Reged: 11/02/11

Loc: Illinois
Re: Motorize Your Focuser with a Tasco 1603EF new [Re: Karl Fabian]
      #5593065 - 12/28/12 06:10 PM Attachment (18 downloads)

Aluminum flat bar stock & shims to re-position motor box assembly to line things up.

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