Re: [CAD_CAM_EDM_DRO] Removing code wheels
Posted by
James Owens
on 2000-07-19 09:09:31 UTC
Hi All,
About a week ago Bill, our illustrious list leader, asked the question of
how to remove the code wheels from the Goldmine G9932 motor. This is the one
with the 400 line wheel.
I know this discussion has appeared at length on the list before, because I
was the one that asked why such a simple task demanded so much bandwidth. I
was told that if you look at these things sideways they are scrap. I have
just received a batch from Goldmine the idea being to remove the code wheels
and fit them to much larger DC servo motors and CNC my Bridgeport type
machine.
The motors arrived last week and have sat on the living room table since
until I got bored and took a screw driver to them. The first thing was to
remove the end cover and have a look at what was inside. I found the code
wheel and an encoder HED H9700. Removing the encoder HED was just two
screws. I checked the wiring to the circuit board which is as follows :
Black = Ground
Red = +5v
Yellow = Output A
Blue = Output B
The HED will also split apart into top and bottom sections with will allow
repairs of faulty components. This is done by sliding the mounting piece,
the holes for the screws, upwards.
The two long screws from the other end of the motor were then removed and
the outside body of the motor removed to expose the armature. Careful
inspection at the brushes end led me to think that I should be able to clear
the plastic brush housing if I pushed from the encoder end with a steady
pressure. This can be done with either a two legged puller, as I did or with
an arbour-press. Using the motor casing to bear against. The code wheel is
held on with a glue and a clip, this all comes off at the same time. There
was no damage to any of the parts.
I have heard of using wedges under the code wheel bearing against the motor
top. I must warn against using these as results may be patchy. The code
wheel is on quite tight and the only thing that stops the motor bearing from
sliding down the armature shaft is a circlip. If this gives way damage to
the armature and possibly the code wheel will be the result.
Can't wait to get the 1000 line encoder motors and look at them.
Regards,
Terry
About a week ago Bill, our illustrious list leader, asked the question of
how to remove the code wheels from the Goldmine G9932 motor. This is the one
with the 400 line wheel.
I know this discussion has appeared at length on the list before, because I
was the one that asked why such a simple task demanded so much bandwidth. I
was told that if you look at these things sideways they are scrap. I have
just received a batch from Goldmine the idea being to remove the code wheels
and fit them to much larger DC servo motors and CNC my Bridgeport type
machine.
The motors arrived last week and have sat on the living room table since
until I got bored and took a screw driver to them. The first thing was to
remove the end cover and have a look at what was inside. I found the code
wheel and an encoder HED H9700. Removing the encoder HED was just two
screws. I checked the wiring to the circuit board which is as follows :
Black = Ground
Red = +5v
Yellow = Output A
Blue = Output B
The HED will also split apart into top and bottom sections with will allow
repairs of faulty components. This is done by sliding the mounting piece,
the holes for the screws, upwards.
The two long screws from the other end of the motor were then removed and
the outside body of the motor removed to expose the armature. Careful
inspection at the brushes end led me to think that I should be able to clear
the plastic brush housing if I pushed from the encoder end with a steady
pressure. This can be done with either a two legged puller, as I did or with
an arbour-press. Using the motor casing to bear against. The code wheel is
held on with a glue and a clip, this all comes off at the same time. There
was no damage to any of the parts.
I have heard of using wedges under the code wheel bearing against the motor
top. I must warn against using these as results may be patchy. The code
wheel is on quite tight and the only thing that stops the motor bearing from
sliding down the armature shaft is a circlip. If this gives way damage to
the armature and possibly the code wheel will be the result.
Can't wait to get the 1000 line encoder motors and look at them.
Regards,
Terry