05-22-2012, 08:42 PM
I have the same thread running on another site and posted this recommendation by Greg as a solution that has worked.
It was pointed out that whilst it will work, I may cause problems in certain situations, some of which could be catastrophic! Here is the key part of the reply:
The good thing is that reversing the motor has eliminated some of the possible issues and narrowed down the possibilities to a worn selector pin. One thing I did note was when the high speed was selected, it tried to pull the gear in too far and it was a little difficult to disengage it to change gears.
Oh well a little more work to do but I am sure I will get there.
It was pointed out that whilst it will work, I may cause problems in certain situations, some of which could be catastrophic! Here is the key part of the reply:
- The reason the gears push the selector away is a kind of a final overload clutch, if something binds the little pin will bend and the gears will skip, if you run it backwards, the pin doesn't take the load the gears bite harder and harder as the power loads up, until either the motor stalls or at very low gearing the case splits or the shafts bend or break
- The other is that depending on design, if the shaft is feeding in the wrong direction sometimes the stops don't work properly leading the table to bind at the extreme end of the table's travel, then... see point number one.
The good thing is that reversing the motor has eliminated some of the possible issues and narrowed down the possibilities to a worn selector pin. One thing I did note was when the high speed was selected, it tried to pull the gear in too far and it was a little difficult to disengage it to change gears.
Oh well a little more work to do but I am sure I will get there.
Hunting American dentists since 2015.