Re: [CAD_CAM_EDM_DRO] Re: replacing servo motor help

Tom thanks for the advice. The encoder glass disk and all associated
hardware 'appear' undamaged. The technician suggested that the 'emitter' and
'receiver's are very fragile and likely have been damaged [internal and out
of sight] he was going to test for that.
in the mean time I'm going to do as you suggested and take a look at the US
Digital site as well as contact Chuck to see if he has a spare.

I do have limit switches installed on my machine but this happened while I
had the one removed so I could get 'just one more inch' of travel. I was
cutting a profile that was a little larger than normal .......... I
neglected to reinstall the switch after the part was done.

>sigh< lesson learned.

Again thank you for taking the time to steer me in the right directions.

Owen

> Since it sounds like the motor encoder is damaged the following might
> help you get running again:
>
> Take the motor off and mark the wires. Open the encoder up and
> visually check it. If the shaft coming out the back of the motor is
> bent then you will have to replace the whole motor. Check for loose
> wire. If one is broken off it may be a challenge to find where it cam
> from but it proabably will be close to where the other solder to the
> board.
>
> If there is physical damage to the glass encoder disk or the small
> printed circuit card then the least expensive approach is to remove
> the existing encoder and replace it with a unit form US Digital. To
> figure out what line count you need check the software and work back
> to the line count from the Steps per Unit value in the motor
> information pages. If you need help with that we need to know what
> control software you are using.
>
> US Digital has a series of encoders (E6) that are not expensive at
> $49.00 and will work for most motors with a rear shaft. There is
> complete information on their website with drawings so you can match
> up your hole pattern to make sure the unit will fit. THey have a
> center tool I would recommend ordering as well.
>
> Another option they have that is even cheaper is the E2 series. They
> have one that has a sticky back in case the mounting holes don't line
> up with your motor. Less than 20 bucks but you need to make sure you
> order the right shaft size and lead configuration. I would also
> invest in the spacing tools.
>
> You might want to get two or three of them.....or fit your table with
> limit switches that kill motor power (;-o
>
> Tom Caudle