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Strong polishing motor


#1

I have a polishing motor that spins at 2800rpm and is simply too
strong. I would like to make it weaker, or make it spin slower. When
I
was an apprentice, we had an induction polishing motor that had a
slow or fast switch. It was great and we used it mostly on the slow
speed. Does any one have any method that this can be achieved? I
checked Rio’s catalogue, but their motors also run at kamikaze
speeds.

Thanks, Hans Meevis


#2

Commercially on larger motors and for precise control a variable
frequency drive is used. (VFD). There are now smaller ones available
but they maybe still be too expensive to be worth it for you.
Honeywell and ABB are 2 of the many companies mfg them. Also the
smallest H/W one is rated to be used to deliver 3 phase from a
single phase source. You may also be able to use a heavier version
of the “foot pedals” that are used with flex shafts etc.

Dan Wellman


#3

Have you tried smaller diameter wheels? This will give you lower
surface speeds. see: “Form Emphasis for Metalsmiths” by Hekki Seppa
isbn 0-87338-212-9 abebooks.com shows lots of new or good copies at
bout $12 He gives a very good explanation for this. I assuming this
is a single phase AC induction motor–if so it is not usually
feasible to change its rotation speed.

jesse

Form Emphasis for Metalsmiths
By Heikki Seppa

http://www.ganoksin.com/jewelry-books/us/product/0873382129.htm
Price: $12.24
Manufacturer: Kent State University Press
Release data: June, 1978


#4

Hans,

I have a polishing motor that spins at 2800rpm and is simply too
strong. I would like to make it weaker, or make it spin slower.
When 

If there are any wiring options to the motor they will be shown
inside the connector box cover mounted on the motor near the
capacitor if used. Different motors have different options;
reversing, multiple voltage, or multiple speed. Trying to use a
resistor switch to slow a motor that isn’t made for that will lead
to over heating and some type of damage or fire. You could look at
getting a shaft (o-1 drill rod will work nice), a couple pillow
block bearings, and a couple pulleys to set up a polishing lathe on
the end of a work bench. This would be made more difficult if your
motor has tapered spindles, but still possible. Less than two hundred
dollars should be easy, less than one hundred maybe.

Good Luck,
Daniel Culver


#5

Hans,

I have my polisher plugged into one of those foot switches. I can’t
remember what they are called at the moment but I’m sure that you
have seen them. The harder I step on the switch, the faster the motor
goes. I like the control and the fact that it stops when I take my
foot off the switch.

John Spiech
Juneau, Alaska


#6
I have my polisher plugged into one of those foot switches. I
can't remember what they are called at the moment but I'm sure that
you have seen them.

Rheostats. more commonly called, “you know, those sewing machine foot
pedals.”

Elaine
http://www.CreativeTextureTools.com
Hard to Find Tools for Metal Clay


#7

Hi all,

I have read a post about too fast motor, I have a lot of motors 1350
rpms, I would give it for free, but sadly I am quite far away from
USA :frowning: Suggestion - look for any old washing machine or anything
that spins. Anyway, Maybe anyone of You uses magnetic polishing
machines, I guess most of You, if anyone doesn’t know how it works I
will explain simply - motor spins around four magnets with different
polarity, while magnets spins they make a iron needles storm inside
some plastic dish. It solves A LOT of problems with polishing -
saves time, polish absolute tricky areas (!!!) etc. I will make a
slide show how to make one machine for 10$, although I think there
are some tutorials. Anyway the question for those who uses this
machine for a long time, what kind of liquid do You use for needles?
I use water with degreaser (FAIRY), but depending on the amount of
degreaser and water needles spins differtently and it is difficult to
determine proportinion. So I would be grateful for any recipes, but
PLEASE don’t use USA brand names of stuff, because, it is unable to
buy most of them i Europe.

Best regards,
Giedrius