Az-EQ5 belt and pulleys

[Fred_76]

Hi!

 

I'm looking for the type of belt and pulleys that equip the Az-EQ5 mount.

On the specification, we can read two settings for the RA axis :
- source FLO : Transmission: 135:1 Worm Drive + 36:12 Timing Belt Drive, Gear Ratio: 810
- source User Manual : Transmission 135:1 Worm Drive + 72:12 Timing Belt Drive, Gear Ratio 810

Both have a gear ratio of 810, but this is not compatible with the tooth numbers of FLO 36:12 which gives a gear ratio of 405.

However, when you look at the internals of the Az-EQ5 mount, you can see that the worm gear pulley has 36 tooth, not 72. Therefore FLO is correct on the "36 tooth" figure, not on the gear ratio, unless the motor pulley has 6 tooth. But 6 tooth pulley is definitely not a common pulley (on the shelves pulleys start from 10 tooth) ! Skywatcher is not correct on the number of tooth of the worm gear pulley (they say 72 tooth instead of 36).

Here is a picture of the belt and pulleys :

So :

- whether the pulleys are 6:36 and the gear ratio is 810
- whether the pulleys are 12:36 and the gear ratio is 405

I don't have any Az-EQ5 to check, so could someone give here the characteristics of the pulleys and belt of their mount ?
- motor pulley number of tooth
- worm gear pulley number of tooth
- belt number of tooth, distance between tooth (should be 2.5 mm) and width

 

Clear sky

Fred