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Solved Drivemaster TDM adapter for M-Uno

  • wsuyker
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16 Aug 2020 11:23 - 16 Aug 2020 11:35 #379 by wsuyker
Drivemaster TDM adapter for M-Uno was created by wsuyker
Hi,
It would be great to add the possibility of unguided imaging to my M-Uno. The Drivemaster TDM ( www.bresser.de/en/Astronomy/EXPLORE-SCIE...M-Tracking-unit.html ) appears to offer the required precision and compatibility (LX200/ST4 compatibility). Overall RMS precision could reach <0.5". I contacted the inventortor to check my understanding, which he confirmed provided that a solid mounting on the polar axis can be achieved. A range of off-the-shelve adapters are offered, but none for the M-Uno. Therefore, I have decided to embark upon designing one and having it machined.
The best mounting can be achieved by replacing the original retaining ring that secures the lower polar axis ball bearing inside the polar house (see enclosed photo where I have unscrewed this retaining ring). After having taken all measurements to make a drawing for a new retaining ring that can also hold the TDM stator, I would like to ask Avalon-Instruments confirmation that:
- the thread on this adapter that screws into the polar house is indeed M64x1.0
- the thread inside the polar axis (for the Celestron AVX polar scope) is M28x1.0

Thank you in advance. I will try to update this post as work progresses.
Willem
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Last edit: 16 Aug 2020 11:35 by wsuyker.

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  • Stefano82
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25 Aug 2020 11:41 - 26 Aug 2020 10:30 #390 by Stefano82
Replied by Stefano82 on topic Drivemaster TDM adapter for M-Uno
Hi Willem

I confirm you that the thread on the polar finder house is M64x1.0 and that the thread inside the polar axis is M28x1.0.

Best regards

Stefano
Avalon Instruments Team
Last edit: 26 Aug 2020 10:30 by Stefano82.

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