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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Can I use a light dimmer on a Scroll Saw motor?
Most of the new scroll saws have variable speed. I have an old Delta
from somewhere around the 1970s. The saw works fine, and is built much better than the new ones which have a lot of plastic parts. But it has one drawback, no variable speed control. I've seen schematics for motor speed controllers, but I already have too many projects to do. Is there any reason I can not use a regular light dimmer to control the speed? I would use a dimmer rated at 600W or greater. (The saw runs on my 300W inverter in my car, so it's not a huge power user). I also have some old electric drills that have bad motors or stripped gears, which have variable speed switches. I suppose I could modify one of them for this use too, but since I need two hands for cutting the wood, I cant be holding a trigger switch. That's why a light dimmer seems most useful. I can just dial the speed I want and dont need to touch the dimmer unless I want to change the speed. Plus a dimmer could just be mounted in an electrical box, with a receptacle next to it, and I can just plug the saw into that box. But I am asking about this because I am a little concerned that the dimmer could be hard on the motor, since these dimmers are made for lighting, not motors...... |
#2
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Can I use a light dimmer on a Scroll Saw motor?
A resistance dimmer (gets hot) might work. Some triac dimmers might work. Look for a variable fan speed control. That would be the ticket. Noting all the while that the scroll-saw motor is not designed for variable speed and will likely heat up in short order. Many motors 'attempt' to draw as much current as they need to operate - and why it is that motor-type items hate brownouts.
Peter Wieck Melrose Park, PA |
#3
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Can I use a light dimmer on a Scroll Saw motor?
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#5
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Can I use a light dimmer on a Scroll Saw motor?
On 02/07/17 03:34, Jeff Liebermann wrote:
On Sat, 01 Jul 2017 00:42:23 -0400, wrote: Most of the new scroll saws have variable speed. I have an old Delta from somewhere around the 1970s. The saw works fine, and is built much better than the new ones which have a lot of plastic parts. But it has one drawback, no variable speed control. The motor is probably the universal series wound type, which works nicely with a triac type speed control: https://en.wikipedia.org/wiki/Universal_motor#Speed_control A dimmer-style control provides poor low-speed running. It might not matter for a scroll-saw, which doesn't need to operate at very low speeds. However, the same circuit made with an SCR can work. Instead of putting the motor in the anode leg, put it in th cathode leg (the side the gate is on). Reverse EMF gives you very good speed regulation down to very low speeds. I don't know if it's possible to do the same thing with a Triac circuit. Clifford Heath. |
#6
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Can I use a light dimmer on a Scroll Saw motor?
On 6/30/2017 11:42 PM, wrote:
I've seen schematics for motor speed controllers, but I already have too many projects to do. Is there any reason I can not use a regular light dimmer to control the speed? I would use a dimmer rated at 600W or greater. (The saw runs on my 300W inverter in my car, so it's not a huge power user). This may or may not work, but it is a true triac speed controller http://www.ebay.com/itm/401361481384 -- Jeff-1.0 wa6fwi http://www.foxsmercantile.com --- This email has been checked for viruses by AVG. http://www.avg.com |
#7
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Can I use a light dimmer on a Scroll Saw motor?
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