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MC-60 Motor Control

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Chuck in E. TN:
unc1esteve,
I will go see if I can resd the color code on those resistors.
BTW, one of my MC-60's is running my greensand muller also. My muller is a Vontorne derivative, made from a BBQ propane bottle.
Chuck

unc1esteve:
My mixer is a Rube Goldburg design of scrap materials.
As I have both my rotator cuffs torn I have difficulty lifting
and handling things.  Same with my hands. The idea is to have
a small mixer above table height that can mix, refurbish and riddle
small amounts of green sand directly above the flask.  I am planning to post
pictures on the metal thread if I am successful.
I am using the treadmill controls as I like the sound of the buzzer
and the soft start.  I was going to use the rpm-distance counter as
a visual aid but I lost the item embedded in the motor flywheel.  I
think it is a magnet but am not sure.  No experience with this.  I replaced
the incline controls with a SPDT switch and removed as much of the
plastic housing as I could.  I have tried several pots to replace all the
controls but until I can resolve the mystery resistor I will keep testing
with the original controls. 

Chuck in E. TN:
I finally got out to the shop to take a closer look at my
MC-60's. The resistor in question is a different value on both controllers. One board is marked Rev J, one is marked Rev E. Funny thing, R42 is clipped on one end on both boards, and the resistor is bent up vertical to the board.! It's not used! Both boards are in service, and both function flawlessly. The Rev J board has R42 in the same position as yours, Rev E board, R42 is near center of the board, on the right side of the big power resistor. Both resistors ar 1/4 watt. Both boards have the label RPS1 next to R42.
I found somewhere on the web, a description of how to defeat the soft start on these controllers. I tried the mod as described, but it didn't work. It involved removing a transistor, if I recall correctly. I reinstalled the transistor. I wanted to be able to set a speed on the mill, and be able to shut it of and restart at the same speed again. Now, I just live with the soft start. It requires turning the speed pot to zero and back up untill the motor starts, and then setting speed. Works the same way as my 7x lathe controller, so I guess it's a good thing, plus I'm used to doing it that way.
I disconnected the muller controller and brought it in side to look at under my magnifier. It's (Rev E) R42 is banded brown, red, black, green, green.
Guess I'm not much help, eh?
Chuck

unc1esteve:
Any help is good help.  We have established that all mc-60s
are not created the same.  That they will run without r-42 connected.
That the value of r-42 will determine the amount of soft start.
I soldered clip-on leads to its terminals.  I can then clip a resistor
in place to observe the affect of the soft start. 
I added a 2-1 gear reducer and then a 12-1  pulley reduction.
The motor will now full start and run with a full load.
It does not over heat.
Am trying different r-42 values with a full load including water and muller ball.
Right now r-42 = 4.7 k.
One would think that a motor and control for a 250lb person  would
run this mixer but not so.  It would get very hot, could not be touched.
The gear reduction adds unwanted noise.  Maybe a few adjustments
with a bigger hammer will help.
Thannk you.

JHovel:
Can any of you confirm - or otherwise - that the MC60 Rev J controller is good for 240V AC input? My DC motor nedds 180V for full speed.
Also, in the original treadmill with digital controller (not MC60) there was no choke on the DC (motor) side at all. It seems the MC60 needs a choke from pictures I've seen. What are the values for this choke? in Henry or resistance, wire diameter and approximate physical size of the core?
Very much apporeciated!

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