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Tutorial News

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 chassis
  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. Drift align and auto guide calibration
  17. Setup EQMOD and PHD2
  18. During work

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


7, Installing 60 teeth pulleys:

Now the fun starts, installing the new items and assembling the mount.

60 teeth pulley:

EQ6 Mount, Installing 60 teeth pulley

I needed to do some fine adjustment of the pulleys to get them to fit.


EQ6 Mount, Lathe teeth pulley

First I have to move the holes to the lock screws. The old to left and the new hole to the right, drilled a 3.2 mm hole as close as I can get to the teeth, 2.2 mm.


EQ6 Mount, Lathe teeth pulley

Threaded the holes to M4. It's very easy to break the threaded tap when working in aluminum, take it slowly and use some liquid to cool and grease. One quarter turn in and then half turn out and ...


EQ6 Mount, Lathe teeth pulley

It's important to clean the pulleys after the machining, an old toothbrush and a knife.


EQ6 Mount, Lathe teeth pulley

I also had open the 12 mm hole to 14.3 mm on the inlet side, 2 mm deep, the shaft from worm gear drive will sunk in here. With a lot of help from my friend we got it to correct dimension in the grind machine.


EQ6 Mount, Lathe teeth pulley

DEC lid that hold the worm drive. All items that's needed. New roller bearings from Swedish SKF (Svenska Kullager Fabriken).


EQ6 Mount, Lathe teeth pulley

The new drilled hole for the stop screw is now aligned with a groove on the shaft.


Mounting the worm gear drive in the lid:

EQ6 Mount, Lathe teeth pulley

The new timing pulleys takes more space then the old spur gears. I have to grind away some material here after the casting to have the timing pulley to rotate freely.


EQ6 Mount, Lathe teeth pulley

I used the Dremel machine to do this, didn't take many minutes.


EQ6 Mount, Lathe teeth pulley

This is how it looks after I grinded the DEC lid.


EQ6 Mount, Lathe teeth pulley

I had to do the same on the RA lid, but it wasn't enough, I have to redo this and grind away more material later.


EQ6 Mount, Lathe teeth pulley

This is the locking ring which set axial play on the shaft and roller bearings. I set some extra force on it when I adjust the position of the timing pulley. Will loosen it later, but there is a problem here. When I adjust it indoors and later take it out in the cold it can block the shaft from moving. Maybe I can modify it with some spring, can be as easy as an O-ring of rubber. This is something I can do later, easy accessible.


EQ6 Mount, Lathe teeth pulley

It's very hard to judge what distance I need between the timing pulley and the roller bearing, I start with 1 mm. I can adjust the distance from 0 to1.5 mm.


EQ6 Mount, Lathe teeth pulley

This feels very good, what a difference compare to the older spur gears. But a lot of work left to do.


EQ6 Mount, Lathe teeth pulley

Close up of the timing pulley and the timing belt.

Now I just wonder, if I had 3D printed the timing pulleys which is much easier (I think), will it had worked as good as this solution?

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To page VIII, RA and DEC shaft shims

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