AT102 ED Focuser Slippage
Posted 03 January 2013 - 11:01 PM
Posted 03 January 2013 - 11:46 PM
Posted 08 January 2013 - 10:36 PM
Posted 09 January 2013 - 09:33 AM
Next, I am confused.. Is it or is it not a Feathertouch focuser. These focuser are rack and pinion and are of extremely high quality, and don't (as far as I know) use two screws on the bottom. The Feathertouch focusers I have seen use a single large knob on the top, and if equipped with a brake, have a long, thin screw on the bottom.
Do you have perhaps a Crayford focuser?
Or is it the two speed drive that someone added?
A picture is worth a thousand words.
Posted 09 January 2013 - 10:12 AM
Posted 09 January 2013 - 10:39 AM
If it is a Crayford type unit (not a rack and pinion), the arrangement is usually similar. The smooth shaft is held against the flat ramp on the focuser tube by a nylon block with a groove in it.
The tension nut (typically) pushes against the bottom of the block to put more tension on the nylon block and increase the friction.
I was going to suggest that the nylon block had perhaps come away from the shaft and was not sitting square to it.
If this were the case, even just taking out the one screw and putting in another could have allowed it to come back into position, but then again, it may not be in the correct position even now.
But we can't know that without taking it apart to see. Usually there are some screws that hold the mirco-focuser in place and this will reveal all.
On the other hand, if it is working now, I would not fuss with it...