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Old 26-05-2015, 07:08 PM
gary
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Join Date: Apr 2005
Location: Mt. Kuring-Gai
Posts: 5,914
Quote:
Originally Posted by troypiggo View Post
It's a 10" Black Diamond SW OTA on a custom dob base by Alex Massey. The rubber ring I'm referring to is in a 3 pronged metal bracket entered on the alt axis.
Hi Troy,

Sounds like it is a JMI Meade Lightbridge three-pronged bracket with
a rubber O-ring that has been adapted?

We have an alternative three-pronged bracket that doesn't use an O-ring
but instead uses a rigid coupling with a set-screw.

Otherwise ensure that the center of the bracket corresponds to the exact
center of rotation around the altitude axis.

Does the tangent arm metal bracket that is fastened to the encoder employ
self-adhesive Velcro? If so, this too is a JMI bracket.

We have an alternate tangent arm and tangent arm coupler that allows the
arm to "float".

Otherwise ensure that the tangent arm is parallel to the side of the rocker
and that it is not exerting a sideways force on the encoder when the OTA
is rotated around the altitude axis.

The encoders don't "like" sideways forces and they can result in encoder
errors.

Best Regards

Gary Kopff
Managing Director
Wildcard Innovations Pty. Ltd.
20 Kilmory Place, Mount Kuring-Gai
NSW. 2080. Australia
Phone +61-2-9457-9049
Fax +61-2-9457-9593
sales@wildcard-innovations.com.au
http://www.wildcard-innovations.com.au
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