lulu
off to a rocking start
Member since January 2017
Posts: 9
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Post by lulu on Nov 18, 2021 22:55:40 GMT -5
I have a 12" slab saw that needs rewiring. The saw's has a 1.5 hp motor as the power source for turning the blade, and I need to add a 2-wirel 4 RPM motor to run the power feed with a 2 wire toggle switch to control it. The saw's main on/off already gives power to the motor, but I need to add the 2 wire power feed motor and the 2 wire toggle switch to control it. What I'm trying to figure out is how to connect the power feed motor and toggle switch to the 1.5hp motor. The saw's main switch connects as follows...black to L1 on the 1.5hp motor, white to L2 on the 1.5hp motor, and the ground to the 1.5hp motor ground. I have the 2 wires from the toggle switch connected to the 2-wires from the power feed motor, but how are they connected to the 1.5hp motor? When I added the black power feed wires to the other black wires going to L1 and the white power feed wires to the other white ones going to L2, the saw's main switch turns the saw on as it should, but when I turn the toggle switch on it shuts everything off instead of turning on the power feed...and at this point, I feel like all I'm saying is blah blah blah!! CAN SOMEONE HELP ME PLEASE? I'm hoping someone can show me how to connect the 2-wire motor and the 2-wire toggle switch to the saw's main 1.5 hp motor...? But at this point, I feel like what I am trying to explain just sounds like blah blah blah!! help!! Please! Thank you!!
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Post by knave on Nov 18, 2021 23:15:12 GMT -5
Here is how I have seen them set up.
Main power cord does not go directly to the 1.5hp motor but to a junction box near the feed motor. Master switch provides power to the feed motor, and and to an outlet that powers the saw motor. When the cut is finished, the linkage or string will auto stop both motors. Can draw a pic if needed.
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Post by knave on Nov 19, 2021 5:09:34 GMT -5
In addition, you can add another switch breaking (interrupting) only the black wire that goes to the feed motor, allowing you to run the saw independently. eta:!wired so it will not run without the saw motor. Or you can use a special switch call double pole, double throw, and wire it as shown (picture sniped from an old post by parfive )
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Post by Rockoonz on Nov 19, 2021 9:28:51 GMT -5
knave parfive is Rich, I am Lee, the 2nd Lee to be specific, Rich may not be amenable to being referred to as Lee lulu without a few more details about your saw I hesitate to offer any wiring advice. Also why a separate switch for the feed and should it be wired through the saw blade switch so the feed won't run without the saw running like Lortone did it? Is it a table top saw or with legs standing on the floor? Is it a trim/slab saw or a slab saw with everything in a box? Is the feed motor at the front or rear of the saw? does the saw have auto shut off? Why a 1.5HP motor on a saw that only needs 1/3 or 1/2? Pics would help, if you don't want to go through the process to post you can PM me and I'll give you an email to send them to and post for you. I would like to help, but want to make sure whatever I offer can be understood and applied to your specific saw.
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Post by knave on Nov 19, 2021 9:47:03 GMT -5
RockoonzWow, I’m sorry. Honest mistake. Also I knew he was Rich not sure why I got confused.
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lulu
off to a rocking start
Member since January 2017
Posts: 9
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Post by lulu on Nov 19, 2021 14:09:40 GMT -5
This is what I know...
Plug does go to junction box at back of saw-continues to saw's main on/off switch in a double gang box-pigtails to an outlet right next to the switch- then heads the 1.5hp motors wire nut chaos ...that much I know for sure...(switch controls power to the outlet and the 1.5hp motor)
Jump to the toggle switch, also in the front...there's just 2 wires (white and black), and they head to the 1.5hp motors wire nut chaos
Now the power feed motor...just 2 wires (black and black) and they head to the 1.5hp motors wire nut chaos
Almost all the wires that met under the cover plate of the 1.5hp motor had such a slime on them from the plastic coating just turning to mush...maybe from years of oil(...?) that it was impossible to tell which wires were what color, so
This is what I tried...
Black (hot) wire from toggle switch, black wire from plug run, black wire from power feed motor (figured out which of the 2 black wires was hot) wire nutted to the black jumper wire attached to L1 on the 1.5hp motor
White (neutral) wire from toggle switch, white wire from plug run, white wire from power feed motor wire nutted to the white jumper wire attached to L2 on the 1.5hp motor
Ground from plug run wire nutted to ground from 1.5hp motor
This is the result...saw's main on/off switch turns on the saw and gives power to the outlet (yea!) but toggle switch in the on position shuts everything down
anybody have any suggestions...?
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Post by knave on Nov 19, 2021 14:21:18 GMT -5
Just from what I’m reading here, it would be best to find a motor shop or electrician to wire it. Not worth getting shocked or burning up a motor. JMO
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lulu
off to a rocking start
Member since January 2017
Posts: 9
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Post by lulu on Nov 19, 2021 14:38:28 GMT -5
I would wire the power feed motor/switch with a seperat plug before having the expense of hiring someone to do it! That's just notr an option for me!
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Post by knave on Nov 19, 2021 15:48:25 GMT -5
Just rambling Make it 1 switch…. That powers both motors. Easy to wire. Let the auto-off shut off that switch.
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Post by Rockoonz on Nov 19, 2021 15:48:32 GMT -5
Okay please don't feel talked down to but I'm probably going to say things you already know, because we have never met. All expected disclaimers are in effect since I can't be there to watch you wire it. First thing, power cord needs to be at least 14AWG, 12AWG, which is larger, would be even better. If the plug is not molded to the end of the cord check to make sure black, white and green wires are attached to the correct contacts on the plug. Easy to google it. I never have a switch on the neutral white wire, all neutrals should be wire nutted and attached to the neutral motor terminals. The reason is that when it's off as little of the wiring as possible is energized. If I were wiring it the black wire from the cord would first attach to the blade switch input. The output would be 2 wires from switch poles or using a wire nut (Remember all wire nuts should be the correct type for stranded wire). One of the output wires should go to the blade motor and the other to the input for the feed motor switch. Output, of course, to the feed motor hot terminal. With this wiring:your blade and feed will not operate with the blade switch off and the feed can be turned off and on with the blade switch on ONLY.
That's the wiring. If this is your first saw there are a number of other things to consider and check before making your first cut. If you are already an experienced rock cutter please disregard the above. Hope I helped.
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Post by knave on Nov 19, 2021 15:58:39 GMT -5
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Post by Rockoonz on Nov 19, 2021 16:18:23 GMT -5
Exactly!^^^ Most important that feed stop if blade stops. My little 10" has bent a blade twice when the blade stopped and feed kept running, when a rock stopped the blade. When the belt starts squealing 20' is a long ways.
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Post by oregon on Nov 19, 2021 16:54:08 GMT -5
and if you want to skip oil baths (single pole relay would also be fine. )
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Post by Rockoonz on Nov 19, 2021 18:02:37 GMT -5
and if you want to skip oil baths (single pole relay would also be fine. )
I like that one. I have some motor relays tucked away in boxes, also a couple limit switches for auto shut off. nice thing there is switch life as well. The new to me old FranTom fused a toggle switch on it's 3rd slab, had to unplug it and get a new one.
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Post by knave on Nov 19, 2021 18:50:58 GMT -5
Keep in mind it’s a 1.5 ho motor You will need a relay rated for that inductive load.
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Post by oregon on Nov 19, 2021 19:29:24 GMT -5
Keep in mind it’s a 1.5 ho motor You will need a relay rated for that inductive load. Yep, I'd suggest lulu take it to someone who knows what's going on, not stuff to mess with if you don't know what you're doing. I think you've all mentioned enough cautions. 1.5hp is extreme overkill imho as well.
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