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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!


9, Test installing timing belts and motors:

RA and DEC motor brackets:

EQ6 Mount, Installing timing belts and motors

Before I can start to install the timing belts I must do some small modifications on the stepper motor brackets. I must prolong the holes to let the adjustment of the tension of the timing belt to have a wider range.


Timing belt holes:

EQ6 Mount, Installing timing belts and motors

The mount chassis has to be modified too. A bigger opening let me move the timing belt and pulley. I need to do it to not have the belt hit the bracket that holds the motor, it's very narrow space here.


EQ6 Mount, Installing timing belts and motors

After the modification had been done it looks like this, but is it enough ? I have to test assembling them one more time.


EQ6 Mount, Installing timing belts and motors

RA belt hole, now 3 mm higher.


EQ6 Mount, Installing timing belts and motors

DEC timing belt hole, now 3 mm higher.


RA bracket:

EQ6 Mount, Installing timing belts and motors

I need to find the distance between the timing belt and the motor bracket. I use an Allen key as reference, I found that a 2 mm Allen key slips in between. This is the RA, but I use the smaller DEC bracket when I doing this.


EQ6 Mount, Installing timing belts and motors

I really want to see how it looks behind. With an digital Endoscope (camera) I can do it.


EQ6 Mount, Installing timing belts and motors

With a 90 degree mirror put on I can come behind and have a look.


EQ6 Mount, Installing timing belts and motors

Looks about what I expect it. The width between timing belt and motor bracket about 2 mm.


Adjusting RA pulley:

EQ6 Mount, Installing timing belts and motors

I adjust the pulley to be 2 mm above the bracket. I need to dismantle the bracket from the stepper motor to reach the locking screws.


EQ6 Mount, Installing timing belts and motors

Test mount the motor. Now I can see that the adjusting points width are enough.


EQ6 Mount, Installing timing belts and motors

The other mounting hole fit as well.


EQ6 Mount, Installing timing belts and motors

Through the DEC timing belt hole I can see the timing belt and pulley deep down there.


EQ6 Mount, Installing timing belts and motors

Later I must have some procedure to find correct tension of the timing belt. One solution maybe to use this opening. But it's very small, if I could I had made a much bigger hole something like 20 mm.


EQ6 Mount, Installing timing belts and motors

For the moment when I only has the RA motor mounted I can use the free DEC opening. Just press a pencil against the timing belt to get a felling of the tension.


DEC bracket:

EQ6 Mount, Installing timing belts and motors

When I mounted the RA bracket I pushed it all the way until the screw holes set stop. Just to gain some extra mm of travel when adjusting the timing belt. I do the same here on the DEC.


Adjusting DEC pulley:

EQ6 Mount, Installing timing belts and motors

Adjusting the DEC pulley to the same 2 mm above the bracket.


EQ6 Mount, Installing timing belts and motors

The DEC timing belt protruding into the chassis.


EQ6 Mount, Installing timing belts and motors

It wasn't as easy as the RA, I need a small rope to stretch out the timing belt before I push in the motor and its pulley.


EQ6 Mount, Installing timing belts and motors

Even the DEC came in correct position, what a golden length of timing belts I bought, 184 mm, but even better with 178 mm but maybe cause other problems.


EQ6 Mount, Installing timing belts and motors

The other DEC mounting hole is also correct.

Now I know everything fit together. I now take everything apart and put on grease.

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