Re: [CAD_CAM_EDM_DRO] replacing servo motor help >solved
Posted by
Owen
on 2006-01-20 09:26:43 UTC
Well what a ride that was.
Thanks to Chuck, Roy, Tom and David for their help. Between the four of you
guys I managed to figured this out.
A:] my encoder had been bumped. I took a long look at the 'glue' holding the
encoder body halves together and noticed the bond had been broken.
B:] This Minertia motor has a differential encoder and my local technicians
don't have enough experience with this stuff to know [not slagging them for
their efforts though.]
So long story short, with nothing left to loose, I pulled the encoder off
the motor and ........ separated the upper and lower body. I know - I know
it'll never work now but, it wasn't working anyway and I wanted to learn.
The encoder body is cast / machined aluminium with locating pins between the
two halves. I immediately noticed the locating holes were marked from the
pins being forced to one side [ >oOps<]
I scrapped all the glue off each half and spent a good 30 minutes studying
where the marks 'came from' and which way the pins would need to go 'back'.
Now I know I got lucky here and you won't believe this but, I put it all
back together and fired up the drive. Sure enough it still oscillated back /
forth and faulted.
So.
With the drive powered up, I sort of tapped the upper half of the encoder in
the opposite direction of the damage. Drive behaviour changed but still not
right. Couple of taps later and it was smooth as silk. It felt like truing
up a small disk in a spinning lathe. Out with the super glue, I hadn't read
your post yet Roy.
Don't get me wrong I KNOW this was a total fluke but it got me up and
running.
I still hope to buy a replacement encoder, David I'll email you off list,
and a spare from US Digital.
I just CAN'T believe how COOL the 3 axis system is. I can hardly wait to get
home from work to make more chips.
: -)
thanks again to the group for their assistance.
Owen Lloyd
CMRA #111p
"Never trade the thrills of living for the security of existence."
Thanks to Chuck, Roy, Tom and David for their help. Between the four of you
guys I managed to figured this out.
A:] my encoder had been bumped. I took a long look at the 'glue' holding the
encoder body halves together and noticed the bond had been broken.
B:] This Minertia motor has a differential encoder and my local technicians
don't have enough experience with this stuff to know [not slagging them for
their efforts though.]
So long story short, with nothing left to loose, I pulled the encoder off
the motor and ........ separated the upper and lower body. I know - I know
it'll never work now but, it wasn't working anyway and I wanted to learn.
The encoder body is cast / machined aluminium with locating pins between the
two halves. I immediately noticed the locating holes were marked from the
pins being forced to one side [ >oOps<]
I scrapped all the glue off each half and spent a good 30 minutes studying
where the marks 'came from' and which way the pins would need to go 'back'.
Now I know I got lucky here and you won't believe this but, I put it all
back together and fired up the drive. Sure enough it still oscillated back /
forth and faulted.
So.
With the drive powered up, I sort of tapped the upper half of the encoder in
the opposite direction of the damage. Drive behaviour changed but still not
right. Couple of taps later and it was smooth as silk. It felt like truing
up a small disk in a spinning lathe. Out with the super glue, I hadn't read
your post yet Roy.
Don't get me wrong I KNOW this was a total fluke but it got me up and
running.
I still hope to buy a replacement encoder, David I'll email you off list,
and a spare from US Digital.
I just CAN'T believe how COOL the 3 axis system is. I can hardly wait to get
home from work to make more chips.
: -)
thanks again to the group for their assistance.
Owen Lloyd
CMRA #111p
"Never trade the thrills of living for the security of existence."