speed control for Milwaukee grinder
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
speed control for Milwaukee grinder
I have a 9 amp 14,500 rpm grinder with 1/4" collet chuck for carbide
and rotary cutters. It is a AC/DC 120 volt motor, thinking as I have a
adjustable voltage auto transformer I can lower the rpm's.
has anyone used a auto transforner as a speed control?
Motor get hot? Will it still have torque to do aluminum intake port
work without laboring down? Trying to avoid purchasing a electronic speed
control that can handle 9 plus amps plus not knowing if it will even work.
and rotary cutters. It is a AC/DC 120 volt motor, thinking as I have a
adjustable voltage auto transformer I can lower the rpm's.
has anyone used a auto transforner as a speed control?
Motor get hot? Will it still have torque to do aluminum intake port
work without laboring down? Trying to avoid purchasing a electronic speed
control that can handle 9 plus amps plus not knowing if it will even work.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
An autotransformer will work great. I keep a big 20A unit around just for that purpose complete with cord and box with outlets on the side of it. It is wired for 0-140V output. If your motor did not draw so many amps a standard light dimmer would work. I have set up a couple of those also for smaller tools like a Dremel or an electric drill with a brush type (universal) motor.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
I use a light dimmer with mine, but mine is a lower amperage Makita.
On a side note, can you get a flex shaft for that one? I have looked all over for a flex shaft tool for 1/4" burr bits, and have come up with nothing.
On a side note, can you get a flex shaft for that one? I have looked all over for a flex shaft tool for 1/4" burr bits, and have come up with nothing.
Thread Starter
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Post Fiend
Joined: Dec 2003
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From: "Islander"
Eric; you nailed it as I have one that's rated 20 amps and one at 10 amps and both top out at 140 volt. Question I have will torque go away before rpm's drop to a reduced or controlled rpm?
The only flex shaft units i've seen are for 1/8" collet Dremel's, kind of weak
and abusive to use to clean up and port intakes.
The only flex shaft units i've seen are for 1/8" collet Dremel's, kind of weak
and abusive to use to clean up and port intakes.
Last edited by "Beemer Nut"; Feb 6, 2007 at 01:00 AM.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
When I use the A-T it seems to have good speed control but when I load it up speed does drop just like it does with full voltage. The foot control models would allow you to add power as you load the tool but if you were not well "coordinated" an overspeed explosion of your tooling could result.
My 10A unit is a panel mount unit that I have never mounted in an enclosure. It just sits on the shelf awaiting an application.
I have seen flex shafts for regular AC induction motors, but the speed would be low.
There are also flex shaft tools like these:
http://www.greenhillsupply.com/flex1.htm
http://www.najatools.com/catalog.php?cid=205
http://www.fandfwoodcarving.com/foredom_txr.htm
And of course the knock offs are everywhere.
My 10A unit is a panel mount unit that I have never mounted in an enclosure. It just sits on the shelf awaiting an application.
I have seen flex shafts for regular AC induction motors, but the speed would be low.
There are also flex shaft tools like these:
http://www.greenhillsupply.com/flex1.htm
http://www.najatools.com/catalog.php?cid=205
http://www.fandfwoodcarving.com/foredom_txr.htm
And of course the knock offs are everywhere.
Last edited by Torque1st; Feb 6, 2007 at 03:26 AM.
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Post Fiend
Joined: Dec 2003
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From: "Islander"
Fur and feathers sure makes some nice products.
My 10A Autostat worked great with that 9 amp
Milwaukee grinder, never got warm on 40 volts
nor did the grinder. Granted this grinder is over 21"
long and 4" diameter but then not a underpowered
Dremel when removing alot metal is needed. I went back
over with the Dremel with the sanding drums.
I purchased two Autostats, one 10A NIB and a used 20A
plus a Fluke 77 at a estate sale for $25. I did good.
My 10A Autostat worked great with that 9 amp
Milwaukee grinder, never got warm on 40 volts
nor did the grinder. Granted this grinder is over 21"
long and 4" diameter but then not a underpowered
Dremel when removing alot metal is needed. I went back
over with the Dremel with the sanding drums.
I purchased two Autostats, one 10A NIB and a used 20A
plus a Fluke 77 at a estate sale for $25. I did good.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
I got mine when I overhauled an animation camera stand. Probably the first one Walt Disney built. I pulled off some goofy light dimmer setup that someone had installed somewhere over the years. Repaired the camera optics so the light dimmers were no longer needed. Rebuilt the X, Y, and Z drives for more accurate operation and motorized the Z-drive for faster production. The camera was well used for a number of years b4 video and computer animation took over completely. It is in a museum now.
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