On 2012-06-17, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
"DoN. Nichols" fired this volley in
:
I remember finding a place which would happily sell me things
like the pulley halves, the motor rotor with shaft (with the old one
going to them as a core charge) the bushings, and various other things.
However -- it has been perhaps fifteen years since I got them, so I'm
not sure that the company is still around. (I'm also not sure who they
were, but they had a nice exploded view of the heads.)
IF not the same company (they were around 15 years ago),
Machinerypartsdepot.com now provides the same services, with the same
happy, helping style and documentation.
I knew about the channel/bolt in the motor shaft, but it was easier to
just put a scissor jack between ceiling and shaft (rather than making
another tool!), and use a large socket as a pressing arbor. Once jacked
down a fraction of an inch, there's a locking screw one can tighten to
prevent the pulley from pushing back against the snap ring.
BTW, Don, the motor is NOT "easier to get out" -- it's WAY harder. On
the "pointing down" manual series I and series II heads, the motor just
lifts up. If you have the clearance (you need about 4"), you can get it
out. On the CNC "pointing up" machines, you have to partially or
completely remove the head and spindle assembly to get the motor out.
Well ... when I got my machine, the motor was in a box packed
alongside it, along with two pulley halves.
The keyway on the motor shaft was badly damaged by the Delrin
jacket on the key in the pulley half having work out along with the
bushing.
I had to figure out how it went together. I used a lab jack
between the motor and the ram, which provided support.
Otherwise, it's trapped between the housing pan and the ram of the
machine.
Mine must have had more clearance. It was a very early CNC
(BOSS-3, with a serial number below "CNC 110", and I was told that they
started with "CNC 100". The logic boards were wire wrapped instead of
full printed circuit boards.
Also, the motor shaft is almost twice as long on the CNCs as on
the manual machines, making you have to "snake it out" rather than just
pull it clear. That's why I had to figure the strategy to tip the head
forward without craning it off.
O.K. Different from what I remember.
FWIW, I think a head removal "jack" that mounts on the table would have
done OK, too, but then you have to remove two or three lines and cables
that pass through the ram.
The only thing which passed through the ram was the oiling line
from the BiJur oiler. The motor power was some oiltight spiral flex
jacket which went into the top of the transformer housing on the back of
the machine, and the FWD/STOP/REV switch and the panic switch were a
different cable which went into the computer box on the side (down low,
IIRC).
They are a MF to re-thread. My forearm won't
even pass through the draughts in the ram, so I have to use a long-reach
gripper to get those lines in and out.
I never even thought of running them that way. Maybe worth
considering. Was this the dovetail ram, or the rigid ram -- I know that
both types were used in these machines.
With my method, nothing needs to
be disconnected except the big AMP-connector cables and air lines to the
brake and spindle speed control motor.
Mine also was too old to have the air motors for the speed
control, and the solenoid for the brake. I plan to have the CNC talking
directly to the VFD to control motor speed, and most of the time can
just leave the variable speed set at one point. (I'm also going to add
a switch to sense the back-gear lever to reverse the FWD and REV
controls on the VFD when it is in back gear, so I don't have to
remember to switch it when changing to back gear.
I'm currently making a replacement motor mount for the Y-axis
motor -- since I am replacing the steppers with servo motors, and the
servo motors are a lot longer, and don't fit in the cavity in the knee
made for the steppers.
Enjoy,
DoN.
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