Thankyou for the information.

William, I've heard treadmill motors recommended for drill presses
in the past, you are the first hollering NO.

Bill, I didn't know you had been to my shop. My feelings are
hurt, though. I don't have the boards and wiring hanging on
nails, I use screws, zip ties, and Velcro. Wrapping everything in
electrician's tape is so hard to rework.

For those who asked:

The motor is a Leeson
1.5 HP
90 volt
15 AMP
4800 RPM
The output shaft is NOT threaded - normal flatted shaft.
It does say Torque 19.7, I've not seen this before and I am
curious what this one means.

The control board is identical to figure 9 he
http://www.leeson.com/cgi-bin/nicefetchpdf.cgi/literature/manuals/pdf/manual_speedmaster_scrthyristor.pdf

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




"Wild_Bill" wrote in message
.. .
Dan, it seems that your motor is a fairly common PM (permanent
magnet field)-type, and therefore has no field wires/leads to be
concerned with.
It should be fairly obvious that the green wire is earth ground,
and is very likely connected to the motor's case/housing.

Yes, reversing the red & black connections will reverse the
direction of the motor when the switch is located between the
circuit board and the motor.
The only precaution is to only switch the direction when the
motor is stopped (the drive circuit board output is zero).
The reversing switch that's generally used is a DPDT (six
terminals) type.

Since the motor is a Leeson, and from a piece of commercial
equipment, it probably has adequate cooling for being run at low
speeds.
This is an important consideration when various other types of
motors, intended to be run at higher operating speeds, are
utilized for running shop machines at lower than (the motor's)
optimum speeds.
Another consideration for the generic variety of treadmill
motors is that they sometimes utilize a flywheel with fins to
act as a fan to cool the motor, which is less effective at
slower speeds, and that the shafts are commonly threaded to
accept the flywheel, because the motor's intended use is to run
in one direction only.

Generally, the only maintenance issue for a quality DC PM motor
such as a Leeson would be to inspect the brushes to make sure
that they're replaced before they wear out, along with cleaning
out any brush dust that may accumulate in the brush
holder/commutator area.
Obviously, if the motor becomes noisy, the bearings should be
inspected and replaced as needed.

Other stuff..
Switches are usually rated for how much current they can switch
(as in turning a device on/off).
Since the reversing switch in this instance only needs to be
able to "hold" the motor current (used for changing direction,
not run/stop), it doesn't really need to be rated for switching
the full motor current. A quality 20A rated toggle switch would
likely be adequate for reversing this motor.

The ideal method to start/stop the motor would be the
treadmill's original method, which probably gradually ramps up
the motor speed when it's started. This may have been a
connection to the drive board that came from the treadmill's
control panel, or another type of operator's switch.
Starting the motor by switching the output of the drive circuit
is likely to damage the drive circuit, and should be avoided.

Many types of drives employ a safety stop method (such as the
occupant falling off the treadmill), and this connection, often
referred to as inhibit, could be used for an emergency stop
switch. The inhibit connections are a safe way to de-energize
the drive's output without risking damage to the circuit.

Any location on the drive circuit could be hot to earth ground,
and the circuit should be in a protective housing to eliminate
any possibility of contact with the circuit.
The AC line connections and the other circuit connections,
including the start/stop switch connections, all need be
insulated for safety.
Any electrical connections should be treated as potential
electrocoution hazards, especially since this is being
considered for a metalworking machine.
That's one reason why so many devices today have so much plastic
on them.

It's creepy to see pics of home shops where drive circuit boards
and other electrical devices are hung on a nail in the wall,
with wires strung around to the machine.

WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html


"DanG" wrote in message
...
engineman,

I appreciate everyone's input, but I want to clear up the
reversing. The motor has red, black, green that terminate on a
printed circuit board. I'm sure the circuit board's primary
responsibility is to create DC and also to provide the variable
input. If I understand correctly, reversing the red, black
motor leads should reverse the direction. My main concern
would be to not hurt the circuit board. The reversing should
occur after the circuit board, and the circuit board should not
be affected?

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)






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