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Post by deb193redux on Oct 3, 2010 16:32:38 GMT -5
Well I got the new split nut clutch for the LS12. No joy.
On further troubleshooting, the gear motor appears to be going backwards. When I look down into the LS10, I see the threaded rod and its collar going counter-clockwise. When I look into this LS12, the motion is clockwise. I held the split nut in place and sure enough it moved towards the front of the saw.
The revolutions also seems to be 3RPM instead of 4, and it does not seem to have as much torque.
I thin someone tried replacing this in the past and got things wrong. I tried reversing the leads on the motor, but the motion was still the same, so it does not appear to be a reversible gear motor.
I can get a new motor form Lortone, for about $62. WIth luck, they will take back the $32 split nut, because the old one seems OK.
Can someone confirm that the motion should be counterclockwise? Before I go off on another wrong tact?
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Post by rockmanken on Oct 3, 2010 17:25:45 GMT -5
I got a new motor for mine and it turns clockwise. Ken
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Post by deb193redux on Oct 3, 2010 17:34:09 GMT -5
When standing behind the motor, or when looking along the threaded shoft towards the motor?
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Post by rockmanken on Oct 3, 2010 17:38:08 GMT -5
Sorry. Looking down into the saw on top of the rod, it is going counter-clockwise. If you were looking at the shaft on the motor with the case off the saw, it goes clockwise. Ken
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Post by deb193redux on Oct 3, 2010 18:07:55 GMT -5
Well then I guess I will be trying a new motor.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Oct 3, 2010 18:31:19 GMT -5
Can they be wired 'backwards'?
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Post by tandl on Oct 3, 2010 18:42:24 GMT -5
I am not familiar with the saw , but can you turn the threaded feed rod around ? as in from end to end , so it feeds the right direction .
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Post by deb193redux on Oct 3, 2010 18:43:51 GMT -5
Only two wires made onto the coil. All I could do was switch the. No joy.
Usually reversible motors have a different terminal for each direction.
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Post by johnjsgems on Oct 4, 2010 9:58:28 GMT -5
Daniel, Is the motor an open type (like Lortone tumbler)? If so, if you can take it apart turn the armature around to reverse.
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Post by deb193redux on Oct 4, 2010 10:54:07 GMT -5
I am not familiar with the saw , but can you turn the threaded feed rod around ? as in from end to end , so it feeds the right direction . I did think of this. There is some non threaded area near the front that is about 1/2 the vise length and a similar amount on the rear, so no problem there. But there is also about a 1" non threaded and reduced diameter where the threads end at the rear. This appears to be a fail-safe where the drive disengages. I would lose that.
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Post by rockmanken on Oct 4, 2010 11:34:28 GMT -5
The replacement motor shafts are a different size from the original on my LS-12. I had to drill out the coupler to fit it. Ken
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Post by deb193redux on Oct 4, 2010 12:59:57 GMT -5
The replacement motor shafts are a different size from the original on my LS-12. I had to drill out the coupler to fit it. Ken I looked at my coupler. The shaft and shaft opening are 1/4 inch. The rod and rod opening is bigger. At a guess 3/8, bu tit could be 7/16. I think I would just buy a new coupler form McMaster if I got a shaft that was a different from 1/4 inch.
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Post by deb193redux on Oct 4, 2010 13:30:19 GMT -5
Daniel, Is the motor an open type (like Lortone tumbler)? If so, if you can take it apart turn the armature around to reverse. I do not think I can reverse anything without breaking something. Here is a pic of the old motor and the wiring diagram: As you can see its rotation is counterclockwise when looking at the shaft. (I have learned that this is the proper way to view motors when describing the rotation. Not from the back looking over the top as I was doing when it was hooked up. Who knew lapidary could be so educational in general.) The issue then is whether to pay $63 to get the authentic part, and as noted above, buy a new coupler, Or, perhaps buy a less expensive 4RPM motor, and maybe still have to buy a new coupler. This one is available for $19 plus $10 in shipping. 4.4 RPM 120 VAC INLINE GEARMOTORNew, MULTI PRODUCTS MF3573 inline gearmotor. Ideal replacement corn pellet stove, auger motor. Aluminum gear housing. Six 10-32 bolt hole face mount on 1-15/16" - 4-3/8" x 2-3/8" centers. SPECIFICATIONS - Speed 4.4 RPM
- Voltage 120 AC
- Amperage 1 Amps
- Torque 104 in - lbs.
- Rotation CW
- Duty Intermittent
- Enclosure Open
- Mount Face
- Shaft 3/8" diam. x 1" w/flat
- Size 3-3/4" x 2-3/4" x 4-3/4"
- Shpg. 5 lbs.
www.surpluscenter.com/item.asp?item=5-1740&catname=It seems like 4.4 is close enough to 4.0, and the torque seems like plenty. I have not measures, but the dimensions seem comparable. It should fit into the enclosure. Not sure why it has an extra shaft on the back. Is that a problem? If I get the motor form Lortone, I would ask them to take a return on the split nut, so the net cost would only be about $35. Either way I need to modify or replace the coupler. What do folks think?
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Post by jakesrocks on Oct 4, 2010 13:48:06 GMT -5
That little bit of extra RPM might be enough to overdrive your power feed. I've found that to be a problem with my 16" Covington. The stone is fed into the blade too fast, causing the blade to jamb in the cut. I'm going to cure this problem by getting a more aggressive segmented blade. If that less expensive motor fits, you'll have to drill a clearance hole in the back of the housing, to clear the rear shaft. I think you'd be time, labor and aggravation ahead by buying the proper replacement motor.
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Post by jakesrocks on Oct 4, 2010 14:14:34 GMT -5
After taking another look at those motors, I think I would have a use for about 3 of them. They would be ideal motors for a little 3 head sphere machine I'd like to build. Should be powerful enough to turn a 2" sphere with no problem. Do you have a link where I can find out more about them ? Thanks. Don
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juzwuz
has rocks in the head
Member since April 2010
Posts: 526
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Post by juzwuz on Oct 4, 2010 14:17:36 GMT -5
Regarding the extra shaft on the back of the surplus center motor, you probably can put a knob on it and manually turn the shaft. Maybe useful for manual feeding? For a speed control maybe a router-speed-control would work to adjust the 4.4rpm to 4rpm? www.harborfreight.com/router-speed-control-43060.htmlI would actually vote with jakesrocks and get the Lortone replacement motor. I guess it depends on if you like tinkering more than slabbing rocks.
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Post by jakesrocks on Oct 4, 2010 15:08:23 GMT -5
Don't think the speed control would work. They're for AC/DC brush type motors.
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Post by deb193redux on Oct 4, 2010 20:38:45 GMT -5
I'm going Lortine.
The only link for the surplus motor is the one I gave above.
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Post by johnjsgems on Oct 4, 2010 20:56:45 GMT -5
Daniel, if the armature (gray metal part) will slide off the shaft you can flip it and change direction. Don't loose any thrust spacers in outer bearing housing. I'm not sure if it will by the picture
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Post by johnjsgems on Oct 4, 2010 20:58:37 GMT -5
By the way, my guess is extra shaft is for mounting a cooling fan.
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