geodes4u
starting to spend too much on rocks
Member since October 2009
Posts: 144 
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Post by geodes4u on Oct 27, 2016 14:53:55 GMT -5
Good Afternoon:
My 18" HP slab saw has bearing problems and the motor repair guy says that he can't fix it because the bearing is in a sleeve. Who would do such a repair, or is it better just to buy another 1 hp motor, like the Diamond Pacific tech told me to do? The original had reset overload protection. Is this over-kill? Will a regular 1 hp motor do the job just fine? I am not a motor guy, so looking for any of you who may have had this issue.
Thanks,
TW
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Post by Drummond Island Rocks on Oct 27, 2016 15:13:50 GMT -5
Good Afternoon: My 18" HP slab saw has bearing problems and the motor repair guy says that he can't fix it because the bearing is in a sleeve. Who would do such a repair, or is it better just to buy another 1 hp motor, like the Diamond Pacific tech told me to do? The original had reset overload protection. Is this over-kill? Will a regular 1 hp motor do the job just fine? I am not a motor guy, so looking for any of you who may have had this issue. Thanks, TW An overload reset on the larger saws are worth the money. When A rock comes loose and binds up the reset should save your motor. With any luck it will also shut the saw down before bad things happen to the blade, belt and arbor bearings. Chuck |
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Post by johnjsgems on Oct 27, 2016 18:13:07 GMT -5
"Sleeve bearings" are just bronze tubes the shaft turns in. Better but more expensive are ball bearings. Generally sleeve bearing motors are not worth the labor charge to have repaired. I'm not sure what a "regular motor" is but you need a capacitor start, 1725 rpm, and manual reset if you can find one. Automatic thermal overloads are OK if you are around when they are running. They will try to restart after they cool off which could be bad if something went wrong to start with.
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geodes4u
starting to spend too much on rocks
Member since October 2009
Posts: 144
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Post by geodes4u on Oct 28, 2016 7:44:29 GMT -5
Thank you for the input, as I trust the advise given by the members here. I usually don't leave the machine when cutting, so will go with the auto overload. Thanks for verifying that the sleeve bearing repair is probably not worth it.
Have a great day,
TW
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riverbendlapidary
fully equipped rock polisher
Member since September 2006
Posts: 1,058
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Post by riverbendlapidary on Oct 31, 2016 15:30:01 GMT -5
check craigslist for a used 3/4 or 1 hp 1725 rpm 110v motor.
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Post by Rockoonz on Oct 31, 2016 23:30:43 GMT -5
Sleeve bearings are fine for applications with no side load on the motor shaft, but anything belt driven is better with a ball bearing motor. www.surpluscenter.com/Electric-Motors/AC-Motors/AC-Motors-Base-Mount/Surplus center has 3/4 and 1 hp motors under 200 before shipping, not sure why you would need 1hp, just a higher electric bill but both are priced about the same. |
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geodes4u
starting to spend too much on rocks
Member since October 2009
Posts: 144
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Post by geodes4u on Nov 1, 2016 12:56:20 GMT -5
Ok, so I have done a little research on this overload protection. If the motor overheats, the contacts open to shut off the motor. If the motor has manual overload protection, there is a button or switch to push to reset the motor? The prices on the link you provided are really good. Have you done business with them? Thank you for taking the time to help with this. I was unable to find anything much less than $300.00. Very Good !!
Thanks,
TW
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Post by johnjsgems on Nov 1, 2016 18:44:33 GMT -5
Surplus Center is a great source for many things. If your original motor was 1 hp I would stay with that. You pay for watts used on the electric bill. If the saw needs X amount of watts to run any motor you use will draw that amount. An under sized motor may be overloaded or fully loaded. A properly sized motor will run about 3/4 loaded for maximum efficiency and longer life. A clamp on amp meter is a great thing to have when setting up motors. You are correct about the overloads. A manual reset has a reset button like a garbage disposal that you push to reset. Automatic overload resets itself when the switch mechanism cools off. This can be dangerous on things like wood cutting saws when they restart.
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