Hey, I have a question for you guys. I have a feeling it's going to be obvious. When using the motors in the C10-NGT reflector telescope model, do the RA and DEC clamps have to be tightened for no manual movement in order to use the motors at maximum efficiency? Or do you leave the clamps absolutely loose, so there can be manual movement, and motor movement? The only thing I've been trying is leaving the clamps loose; I'm afraid that I'll wreck the motors if I tighten the clamps and the motors will be trying to move, while the clamps are tightened. So, leave the clamps tight or loose while using the motors?
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I assume you mean by sheathing the cabling to the RA and DEC motors and by battery compartment the control panel. If the seller stated that the scope was working, indeed you got ripped off. If by ratings you mean ebay I would contact them about a return and refund. If you got a great price, all is not lost since there is an upgrade to an autostar which will get you back in working order (but you need the RA and DEC motors). Autostar upgrade is about $ 520 but you will still need a 12V power supply. George Dudash 760 383 2741 sells these kits and can probably get the other parts you need to get going. I'm guessing this may cost around $ 800 total from what you say. If you paid more than $ 1000 for that scope I'm afraid you were ripped.
The main problems encountered with the mechanics of the telescope centre around
the mechanical swarf, grease compound, the liberal use of grease and the quality
of machining of the main DEC and RA gears.
1. Remove the motors from the telescope. Be careful when removing either
motor as there is a compression spring between the motor mounting frame and
the worm shaft assembly.
The RA motor is located under the telescope body, removing the 4 screws and
2 Allen bolts will allow the bottom cover to be removed, thereby allowing access
the the 2 Allen bolts holding the motor in place. Unplug the motor from the
main PCB before removal.
The DEC motor is in the the fork arm containing the clutch and fine DEC adjustment
control. (Never to be used with power applied to the scope). Remove the 3 small
Allen screws holding the plastic cover plate in place and the DEC clutch knob
to allow access to the motor. Remove the RJ45 connector located inside the telescope
fork arm. Then remove the motor by unscrewing the 2 Allen bolts holding the
motor in place.
2. Remove all grease from the motor worms, especially around the RA motor's
magnetic pulse detector and the permanent magnet built into the worm shaft.
3. Remove all grease from the main DEC and RA gears, making sure to clean into
the gear teeth.
4. Lightly re-grease with a Molybdenum Disulphide based grease (Castrol MS3
is great for this application if you can get it)
5. Assemble in reverse order. But before doing so, carry out the electrical
adjustment above then, (a) relocate the the RA and DEC control PCB's in the
vertical plane thereby gaining access to their respective backlash Allen screws.
Adjust for 20thou max clearance when in final position. Note:- the DEC adjustment
screw has to be replaced for a longer unit complete with a thin bolthead as
this adjustment has to be carried out with a spanner....there is no room for
an Allen key adjustment here.
6. A drop of Loctite must be applied after adjustment.
7. The final part of the process is to run in the gearing. Apply 12 volts to
the motor wires, either at their respective plugs or to the motor direct. Allow
to run for 2 to 3 hours in each direction by reversing the battery polarity
to bed the teeth engagement. Remember to release the clutches.
Once you are polar aligned, rotate the tube to a star in the sky that you KNOW the name of. Look up the Right Ascension of that star on a cell phone app or a laptop planetarium program like this one: www.stellarium.org
Rotate the RA setting circle so it matches what the phone or laptop indicate. LOCK down the RA circle. Your scope is now adjusted to the sky and you can use the numbers on the DEC and RA to find other objects of known RA & DEC.
Once the scope is polar aligned move it to a named star that you can identify. Look up the RA and DEC for that NAMED star in any planetarium phone APP or a laptop running any planetarium software like the free software available at www.stellarium.org
Adjust the circles to MATCH the RA and DEC in the planetarium software, and lock them down.
Now you can use them to find other objects of known RA and DEC.
Could be that the DEC motor driver has died. That could be verified by swapping the connections between the RA and DEC. If the DEC now moves, then that is the problem. If not, then the DEC motor is bad.