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Timing drive pulley


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Bottletopburly

@GrahamCurrently looking to add my little stars  mk1 deepskydad  autofocuser   To my 127mm mak now I need a timing drive pulley with a 12mm bore  to replace focuser adjuster is it going to make a big difference as to how many teeth I need seen a video and they used 40 toothed wheel  other than belt size will it make a difference if I used slightly less toothed drive pulley .

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Hi David. The only difference will be the gear ratio. If you use less teeth your focus adjustment will not be so fine.

 

Hi David.

The only difference will be the gear ratio.

If you use less teeth your focus adjustment will not be so fine.

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