My astronomy project:
EQ6 Mount, dismantling / rebuilding

Contents:

1. Introduction and Disassembling
2. Internal gearbox alternatives
3. Needed belt length, measurements
4. New timing belt and pulleys has arrived
5. Lids to worm gear adjusted
6. Lathe of 60 teeth pulley
7. Installing 60 teeth pulleys
8. RA and DEC shaft shims
9. Test installing timing belts and motors
10. Installing RA timing belt and motor
11. Installing DEC timing belt and RA shaft into chassi
12. Testing and adjusting
13. Power up and EQMOD gear ratio setup
14. Hang up the telescope, balancing and calibrating parking point
15. Fine adjusting RA and DEC worm gear play
16. Test of auto-guiding
17. Deep into the RA drift compensation
18. During work

Note:
I take no responsibility or liability for what are written here, you use the information on your own risk!

4, New timing belt and pulleys has arrived:

Always exiting when new parts arrive, will they fit ?

Not sure about that, I couldn't get exactly what I want, just close.

Timing belt and pulleys:

I got the correct parts I ordered and they look good. But there is one thing, the 60 teeth pulley was a bit wider than I expected, the teeth is 10 mm wide not 7 mm. There was no information about the size of the width more then it fit 6 mm timing belt. I have wrote to them and asked if it was the correct pulley I got.

Now I got the answer, it's correct, I just misunderstood. I have to do some machining work anyway, just a little bit more to do.

16 teeth pulley:

The small 16 teeth pulley is just a bolt on work. The locking screws is hidden by the bracket frame, not a big problem.

60 teeth pulley:

This maybe cause more or less work to have it fit. The 60 teeth pulley is too big to fit, which I already know when I ordered it.

To wide, some machining needed.

It don't get deep down enough to be inline with the opening.

Hub diameter:

First I check with the original spur gear which maximum hub diameter I can have. It's now 20 mm plus a margin of 4 mm. The drill's size is 2 mm and just fit between the spur and the chassis. To be on the safe side, maximum diameter I can have is 23 mm.

The 60 teeth pulley's hub has a diameter of 29 mm, need a lathe to take it down. Any problem? Yes, I don't have a lathe but used to have it from my earlier works.

Teeth width:

The width of the teeth is 10 mm, I have to take it down to 7 mm.

Hub length:

In this space the hub length must fit, 16 mm.

The overall length is 19 mm, 3 mm will be cut from the teeth, need to take away one more mm on the other side.

Now I must think about these needed machining works to be done and plan before I start machining the pulleys.