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Is it possible to reverse the rotation of a radial saw motor?
Just wondering whether it could be done.
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Is it possible to reverse the rotation of a radial saw motor?
If it is 3 phase, swap two of the power wires.
Otherwise the motor might have cw and ccw shades and it is a mater of re-wiring. Takes specs of that motor and knowledge. Martin wrote: Just wondering whether it could be done. |
Is it possible to reverse the rotation of a radial saw motor?
In article ,
"Martin H. Eastburn" wrote: wrote: Just wondering whether it could be done. If it is 3 phase, swap two of the power wires. Otherwise the motor might have cw and ccw shades and it is a mater of re-wiring. Takes specs of that motor and knowledge. At least a few radial arm saws (Wards Power Kraft for one) use/used universal motors, wherein swapping the polarity of the rotor relative to the stator ought to reverse the motor. One obvious way to do this on such a motor is to swap the connections to the brush leads. I do sincerely hope the original poster isn't intending to use the radial saw in reverse; that sounds like a recipe for disaster. I suppose if one wanted the blade on the opposite side of the traveler one would need to reverse the rotation of the motor (and probably reengineer the mount some), but otherwise...ouch. -- Andrew Erickson "He is no fool who gives what he cannot keep to gain that which he cannot lose." -- Jim Elliot |
Is it possible to reverse the rotation of a radial saw motor?
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Is it possible to reverse the rotation of a radial saw motor?
When I got my Delta Band saw - it came from a good dealer in
a state. The manager was at a conference and the guys shipped a bandsaw and a motor. The motor had sawdust on it and wasn't in a new box. Hum - stripped it off something. Looks new. I installed it and the saw ran backwards. Just like a lathe.... I swapped the wires as mentioned - inside it was marked - and then the saw cut wood. I then converted it to 14". So wood working motors as others reverse. Martin -MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. |
Is it possible to reverse the rotation of a radial saw motor?
On Wed, 14 Jan 2009 21:44:36 -0600, "Martin H. Eastburn"
wrote: When I got my Delta Band saw - it came from a good dealer in a state. The manager was at a conference and the guys shipped a bandsaw and a motor. The motor had sawdust on it and wasn't in a new box. Hum - stripped it off something. Looks new. I installed it and the saw ran backwards. Just like a lathe.... I swapped the wires as mentioned - inside it was marked - and then the saw cut wood. I then converted it to 14". So wood working motors as others reverse. Martin -MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. Some do, some don't - and some are unpredictable. A good friend has a nice radial arm saw from the 60's -can't remember the manufacture (deWalt, perhaps?)r but it's hammertone green - and it will occaisionally start backwards - but worse yet, if it jams it WILL reverse. It will throw sticks with a veangeance given half a chance!!!!! |
Is it possible to reverse the rotation of a radial saw motor?
-MIKE- wrote:
wrote: Just wondering whether it could be done. I've always wondered the same thing. Strange, I've spent my life NOT wondering :) -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
Is it possible to reverse the rotation of a radial saw motor?
On Jan 15, 7:06*am, "dadiOH" wrote:
-MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. Strange, I've spent my life NOT wondering *:) -- dadiOH ____________________________ dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it athttp://mysite.verizon.net/xico I find that question often interrupts dreams of a sexual nature. It is just when the blond swedish twins start unbuttoning their tops that the question about motor reversal rears its ugly little head. |
Is it possible to reverse the rotation of a radial saw motor?
Don't believe so.
It is an AC motor and will rotate with the field. If it was three phase it could be done. Why?? wrote in message ... Just wondering whether it could be done. |
Is it possible to reverse the rotation of a radial saw motor?
wrote in message ... Just wondering whether it could be done. Yes, Turn the motor and blade unit 180 degrees so that the blade is located on the opposite side. |
Is it possible to reverse the rotation of a radial saw motor?
Robatoy wrote:
On Jan 15, 7:06 am, "dadiOH" wrote: -MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. Strange, I've spent my life NOT wondering :) -- dadiOH ____________________________ dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it athttp://mysite.verizon.net/xico I find that question often interrupts dreams of a sexual nature. It is just when the blond swedish twins start unbuttoning their tops that the question about motor reversal rears its ugly little head. It's good that I've learned to set my coffee down before reading anything posted to this group. Out through the nose is no place to send a big slurp of hot coffee. :-) -- Free bad advice available here. To reply, eat the taco. http://www.flickr.com/photos/bbqboyee/ |
Is it possible to reverse the rotation of a radial saw motor?
On Thu, 15 Jan 2009 09:36:07 -0600, Steve Turner
wrote: It's good that I've learned to set my coffee down before reading anything posted to this group. Out through the nose is no place to send a big slurp of hot coffee. :-) Cleans and sterilizes the sinuses to prevent infection. Tim Douglass http://www.DouglassClan.com "I'm not exactly burned out, but I'm a little bit scorched and there's some smoke damage." |
Is it possible to reverse the rotation of a radial saw motor?
Robatoy wrote:
On Jan 15, 7:06 am, "dadiOH" wrote: -MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. Strange, I've spent my life NOT wondering :) -- dadiOH ____________________________ dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it athttp://mysite.verizon.net/xico I find that question often interrupts dreams of a sexual nature. It is just when the blond swedish twins start unbuttoning their tops that the question about motor reversal rears its ugly little head. I feel your pain in my waking state, other things when asleep :) -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
Is it possible to reverse the rotation of a radial saw motor?
On Jan 14, 5:13*pm, wrote:
Just wondering whether it could be done. As others have noted, you might be able to swivel the sawhead 180 degrees (would only be safe if you also repositioned the fence to the far-from-column side of the work). Electrically reversing the motor is probably psosible (usually these have brush-style motors, you could reverse the brush polarities); the gears, however, would NOT necessarily mesh neatly with the newly reversed drive, and some kinds of spiral-cut gears could cause the blade position to destabilize. |
Is it possible to reverse the rotation of a radial saw motor?
On Mon, 19 Jan 2009 21:54:24 -0800 (PST), whit3rd
wrote: Electrically reversing the motor is probably psosible (usually these have brush-style motors, you could reverse the brush polarities); I assume this is an AC motor. Don't the brush polarities reverse 60 times per second already? Or possibly I'm not understanding what you're saying? Tom Veatch Wichita, KS USA |
Is it possible to reverse the rotation of a radial saw motor?
In article ,
Tom Veatch wrote: On Mon, 19 Jan 2009 21:54:24 -0800 (PST), whit3rd wrote: Electrically reversing the motor is probably psosible (usually these have brush-style motors, you could reverse the brush polarities); I assume this is an AC motor. Don't the brush polarities reverse 60 times per second already? Or possibly I'm not understanding what you're saying? They do indeed reverse 120 times per second (60 full cycles per second), but so does the field coil, so the relative magnetic polarity of the one with respect to the other stays the same. In other words, the repulsion or attraction of the two doesn't change. By swapping the brush connections, the magnetic polarity of the rotor with respect to the stator is reversed and the motor forced to turn in the other direction. Motors of this design are often termed "universal motors" because they will operate properly on AC or DC current, and furthermore are not particular about AC power frequency. My RAS with such a motor is specified as being for either 25Hz or 60Hz AC; I assume 50Hz would also be OK. DC is presumably not listed because of the power switch being insufficient to properly cut off high DC currents, not because the motor would fail to work properly. -- Andrew Erickson "He is no fool who gives what he cannot keep to gain that which he cannot lose." -- Jim Elliot |
Is it possible to reverse the rotation of a radial saw motor?
On Tue, 20 Jan 2009 15:24:09 -0500, Andrew Erickson
wrote: They do indeed reverse 120 times per second (60 full cycles per second), but so does the field coil, so the relative magnetic polarity of the one with respect to the other stays the same. ... That's the way I understand it and I won't quibble on whether it's 60 or 120 time/sec. Kinda depends on the definition of "reversing". So "reversing polarity" of the brushes - which I interpret to mean switching leads - won't have any effect on rotation direction of a universal or any other type of AC motor. That would be no different than reversing the plug in the wall socket. On the other hand, breaking the motor open, and doing some internal rewiring might accomplish the mission. Tom Veatch Wichita, KS USA |
Is it possible to reverse the rotation of a radial saw motor?
In article ,
Tom Veatch wrote: On Tue, 20 Jan 2009 15:24:09 -0500, Andrew Erickson wrote: They do indeed reverse 120 times per second (60 full cycles per second), but so does the field coil, so the relative magnetic polarity of the one with respect to the other stays the same. ... That's the way I understand it and I won't quibble on whether it's 60 or 120 time/sec. Kinda depends on the definition of "reversing". So "reversing polarity" of the brushes - which I interpret to mean switching leads - won't have any effect on rotation direction of a universal or any other type of AC motor. That would be no different than reversing the plug in the wall socket. On the other hand, breaking the motor open, and doing some internal rewiring might accomplish the mission. Switching the leads to the brushes generally does require breaking the motor open and rewiring it internally a bit. It's not the same as reversing the plug in the wall socket (which, as you correctly observe, would have no effect on the direction of rotation). Swapping the input leads changes both the field (stator) and the rotor, and so the rotation stays the same. Swapping the brush leads changes only the rotor, but leaves the field unchanged, so the relationship between them is reversed. Here's the a link to a quick schematic sketch of this operation on a series wound motor that might make things a bit clearer: http://users.gmavt.net/drewe/pix/misc/Motor.png -- Andrew Erickson "He is no fool who gives what he cannot keep to gain that which he cannot lose." -- Jim Elliot |
Is it possible to reverse the rotation of a radial saw motor?
If it is a single phase motor it won't reverse.
Think about all those two prong corded ac 115 VAC tools...... You can reverse rotation on a three phase mpotor but as the other folks said, why? "Tom Veatch" wrote in message ... On Mon, 19 Jan 2009 21:54:24 -0800 (PST), whit3rd wrote: Electrically reversing the motor is probably psosible (usually these have brush-style motors, you could reverse the brush polarities); I assume this is an AC motor. Don't the brush polarities reverse 60 times per second already? Or possibly I'm not understanding what you're saying? Tom Veatch Wichita, KS USA |
Is it possible to reverse the rotation of a radial saw motor?
"Jay Giuliani" wrote in news:MdPdl.1150$Aw2.892
@nwrddc02.gnilink.net: If it is a single phase motor it won't reverse. Think about all those two prong corded ac 115 VAC tools...... You can reverse rotation on a three phase mpotor but as the other folks said, why? If you reverse the rotation, doesn't it reattach the piece you cut off? Puckdropper -- On Usenet, no one can hear you laugh. That's a good thing, though, as some writers are incorrigible. To email me directly, send a message to puckdropper (at) fastmail.fm |
Is it possible to reverse the rotation of a radial saw motor?
On Thu, 22 Jan 2009 00:38:04 GMT, "Jay Giuliani"
wrote: If it is a single phase motor it won't reverse. Think about all those two prong corded ac 115 VAC tools...... You can reverse rotation on a three phase mpotor but as the other folks said, why? "Tom Veatch" wrote in message .. . On Mon, 19 Jan 2009 21:54:24 -0800 (PST), whit3rd wrote: Electrically reversing the motor is probably psosible (usually these have brush-style motors, you could reverse the brush polarities); I assume this is an AC motor. Don't the brush polarities reverse 60 times per second already? Or possibly I'm not understanding what you're saying? Tom Veatch Wichita, KS USA You most certainly CAN reverse a single phase motor. On some motors the connections are brought out to make it simple, on others you would need to dig a bit. My lathe has a 1 HP single phase cap start motor that can be started in either direction. Almost any single phase induction motor will run backwards if spun fast enough backwards before power is applied |
Is it possible to reverse the rotation of a radial saw motor?
On 1/15/2009 8:07 AM Robatoy mumbled something about the following:
On Jan 15, 7:06 am, "dadiOH" wrote: -MIKE- wrote: wrote: Just wondering whether it could be done. I've always wondered the same thing. Strange, I've spent my life NOT wondering :) -- dadiOH ____________________________ dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it athttp://mysite.verizon.net/xico I find that question often interrupts dreams of a sexual nature. It is just when the blond swedish twins start unbuttoning their tops that the question about motor reversal rears its ugly little head. Shredded wheat and milk through the nose is painful. Oh, and you owe me a keyboard. -- Odinn RCOS #7 SENS BS #154 |
Is it possible to reverse the rotation of a radial saw motor?
"Leon" wrote in message ... Yes, Turn the motor and blade unit 180 degrees so that the blade is located on the opposite side. So uh, while my answer may have seemed like a wise ass answer, if you took my suggestion would it accomplish what you are trying to do? Having use a RAS for 5 or 6 years to build probably half the furniture in my house and used lots of attachments on it, I have never needed to make the motor spin in the opposite direction in which it was wired to do. Why do you need to reverse the spin on yours? |
Is it possible to reverse the rotation of a radial saw motor?
On Jan 22, 10:17*am, "Leon" wrote:
"Leon" wrote in message ... Yes, Turn the motor and blade unit 180 degrees so that the blade is located on the opposite side. So uh, while my answer may have seemed like a wise ass answer, if you took my suggestion would it accomplish what you are trying to do? *Having use a RAS for 5 or 6 years to build probably half the furniture in my house and used lots of attachments on it, I have never needed to make the motor spin in the opposite direction in which it was wired to do. Why do you need to reverse the spin on yours? I have been experimenting with this: http://www.youtube.com/watch?v=upDrKjY0adw No shown are a few more items that we installed later: A chip deflector and a scrub brush anti-kickback. I am also working on a mechanical hold down. Just having fun and games, |
Is it possible to reverse the rotation of a radial saw motor?
On Jan 20, 1:42*pm, Tom Veatch wrote:
..."reversing polarity" of the brushes - which I interpret to mean switching leads - won't have any effect on rotation direction of a universal or any other type of AC motor. That would be no different than reversing the plug in the wall socket. On the other hand, breaking the motor open, and doing some internal rewiring might accomplish the mission. What I intended was to swap the wires to the two brushes (this is easy to describe, there are other rewirings that would accomplish the same thing). Because the brushes activate the ROTOR magnetization, the swap would reverse the rotor poles without changing the other magnetic part, the STATOR. That accomplishes the reversal of a brush-type (universal) motor. Think of the (temporary N) pole on the rotor, pulled clockwise; if you make it instead a (temporary S) pole, the attraction becomes repulsion and the motor goes counterclockwise. Swapping the wall socket polarity would reverse both rotor and stator fields, so has no effect on rotation direction. |
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