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Thread: Speed Control for brush motors
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26th March 2009, 11:16 PM #31
Almost looks like time for that Electronics forum that people asked about a while ago.
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26th March 2009 11:16 PM # ADSGoogle Adsense Advertisement
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28th March 2009, 12:30 PM #32Awaiting Email Confirmation
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Dear Noel,
It looks like I might actually still be able to lay my hands on a Kemo MO12 after all. If you happen to have one of those plug-in, in-line, Power Consumption Monitors, I wonder if you could run the following tests for me:
1) Plug a Circular or Mitre Saw as close to 1600w as you can find into the Monitor, and fire it up and see whether you can get both the peak start-up, and the ongoing at-idle, amperage readings for it.
2) Plug the same Saw into your new Jaycar Kit, turn the Speed Control knob on the Kit right down to its Minimum, make sure the Kit's Switch is in the "Controlled Speed" position, plug the Kit into the Power Consumption Monitor, and then fire the Saw up again, and get the same two types of readings again.
3) If you are at all tempted, don't plug the Saw into the Kemo until you have verified any decrease in the Current Draw as a result of slowing the thing down by using the Power Monitor on the Jaycar Kit first (otherwise you might end up with another "smokey" - this time the Kemo...)
If you don't have one of those meters - No Problemmos! I will just start up another thread asking for the same favour...
Many Thanks,
Batpig.
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28th March 2009, 03:43 PM #33
Sorry Batpig,
Don't have a power monitor.......if I did I'd probably just worry.
Sounds like a good test though.
Did a real good test on the diac controller today.
Running a drill putting 50mm Teck Screws into 70mm square OBH . Slow speed..plenty of torque....when the last screw was fully home, I kept the drill on. No dirty brown smell.....all I did was hurt my wrists holding the drill.
Tons of fun though.
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28th March 2009, 09:08 PM #34Awaiting Email Confirmation
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Dear Noel,
Well thanks all the same anyhow. I was thinking about starting up another thread in this eventuality, but it's just occurred to me that the probability of someone having a Speed Controller Kit (new or old), multiplied by the probability of someone having a Power Consumption Monitor, comes to a fairly small decimal probability of someone having both.... I suppose I could just ask whether someone with a Power Consumption Monitor could measure their Mitre Saw's current draw at full idle speed...
Anyway, I shall press on with the creation of CorniceSawstein whilst continuing to weigh up my options on the Speed-Reduction front...
Best Wishes Noel,
Batpig.
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30th March 2009, 07:48 AM #35Awaiting Email Confirmation
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Batpig,
Did some hunting around and found the Silicon Chip mag from Nov 1997.
Yes, you can still get the circuit board for it. Some of the parts may be a littler harder to obtain. (Can't find any in Oz). Any subistution would have to be for higher rated components. Will check the US websites.
Pi55ed off that I didn't make one of these for myself.
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30th March 2009, 08:42 AM #36Awaiting Email Confirmation
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Dear Steve,
Just out of interest, how did the 1997 SC Design perform in the area of "Cogging"? And the Current Handling: 5A if I recall correctly?...
I'm thinking of the Kemo module now; sounds smooth from what Noel has said. There is a fair bit of "Play" in the wind-up of the helical-threaded gears in my Mitre Saw, and Cogging is therefore definitely something that I want to avoid so as to not worsen the situation any further. My only concern would be Current Handling - only about 2.5A Continuous by the looks of it...
Best Wishes,
Batpig.
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30th March 2009, 09:00 AM #37Awaiting Email Confirmation
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Batpig,
The 97 one was a full 10A kit. Don't remember that cogging was a problem (did't have much time to test it as it was on its way to the UK) but the speed control kicked in as soon as the pot position was changed.
If you want I can scan/copy the article and send it to you.
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31st March 2009, 03:41 PM #38Awaiting Email Confirmation
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Dear Steve,
Thanks very much for the offer, and the 10A Rating does sound impressive, but hold off for now because I wouldn't have any more luck than you tracking down the required parts (probably most notably the SBS going by the SC article that came with the new Kit...), especially since I don't have a Credit Card! .
I just might end up taking the plunge on the Kemo Module, though, once I've finished modifying the Saw. What have I got to lose - probably just a $35 Module if I "cook" the thing... (I'll only be cutting in short bursts anyway...)
Best Wishes,
Batpig.
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31st March 2009, 08:48 PM #39Awaiting Email Confirmation
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Batpig,
BIL in the UK may be able to get the hard to get parts for me (German suppliers). So I'll get a few sets if he can find them. Spoke to the guys a Silicon Chip and yes they still have the circuit board. If I get all the bits I'll build that one as well.
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13th April 2009, 05:34 PM #40Awaiting Email Confirmation
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Dear Gents,
I can now verify that Noel is pretty much spot-on with what he says here about the Kemo MO12. I've just finished fitting one in-line along my Mitre Saw's cord, and it's generally running the Saw smoother and quieter than the Jaycar Kit, with less Cogging and greater Speed Variation all the way down to "Full-Stop". They don't show up on the Jaycar website unless you do a search using the Stock Code AA0346, or ring them and quote this Code. Cost was $34.95, but please note the Current limitations that Noel has alluded to - Rated at 600w Continuous, or 1200w Peak.
Best Wishes,
Batpig.
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13th April 2009, 06:32 PM #41Senior Member
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A while back, I was reading about etching circuit boards (since I found designs abound more than kits for motor speed controllers and I want one for my slide compound saw of suitable rating). Apparently, it is possible to print on laser printer and iron onto copper and etch. There are proper products that cost several dollars a sheet, but apparently it can be done using magazine pages as an intermediary carrier for the toner - print on magazine coated paper; iron onto copper; wash off paper; etch as usual.
Haven't gotten around to the DIY circuit boards trick quite yet...(other projects beckon)
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29th April 2009, 11:13 PM #42Member
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May Silicon Chip has a new kit for a 10 amp full wave speed control that can give full voltage to the motor ,the kit is $100 at Jaycar.
Mark
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30th April 2009, 12:15 PM #43Awaiting Email Confirmation
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Mark,
If you are talking about the kit KC5477 from Jaycar then this is the kit we are having problems with.
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30th April 2009, 12:57 PM #44Senior Member
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Worth checking out this thread for alternatives:
https://www.woodworkforums.com/f20/speed-controller-75255
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30th April 2009, 06:59 PM #45Member
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Steve
The new kit is KC5478
Mark
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