rivertoyz
starting to shine!
Member since November 2008
Posts: 27
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Post by rivertoyz on Mar 1, 2009 17:13:42 GMT -5
:help: I have a old 20" Highland Park Slab Saw (R-1). I need a new motor. I tried Diamond Pacific but they were NO help. It was suppose to be equipped with a 3/4 heavy duty motor . That was 30 years ago. If possible, I like to see if I could use a 1 or 1 1/2 hp motor. If someone has a 20" slab saw could you please tell me what motor I need to get that would work. I don't have a motor to go by. So, not sure on all the specs to get a new one. Thank you for any advise or info.
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Post by texaswoodie on Mar 1, 2009 18:41:38 GMT -5
My HP 18 inch has a 1/2 HP. I would think a 3/4 would be more than enough.
Curt
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Post by catmandewe on Mar 1, 2009 22:56:16 GMT -5
Any motor with the right speed and rotation will work. On a 20" I would go 3/4 hp or higher. Most slab saws use 1725-1750 rpm motors with CW (clockwise) rotation. Continuous duty is good, thermal protection is good, capacitor start is good, reversible means you can run them CW or CCW. You can also use the 3500 rpm motors, but you will need to change your pulley sizes to keep your blade speed in the right operating range.
I have a 16" saw that I put a 2 hp motor on it, works just fine, but if I am cutting really hard rock I have to watch it because the motor will not bog down and the feed can feed too fast and cause binding.
Tony
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Post by Woodyrock on Mar 2, 2009 1:00:48 GMT -5
I have a twenty inch HP, and put a new 2Hp motor on it. The original 3/4 Hp died soon after I got the saw. The 2HP I bought for the HP is a Farm duty motor...slighty more expensive, but as rugged a motor as you can buy. They are made to operate in an abusive environment.....like under a rock saw! Like Tony said...the 2Hp will not bog down, but will destroy a belt when the blade stops. Woody
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mossyrockhound
fully equipped rock polisher
Member since January 2011
Posts: 1,278
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Post by mossyrockhound on Mar 4, 2009 0:48:28 GMT -5
There are quite a few variables you need to consider when purchasing a motor for your saw. Most of the things you need to consider are mentioned already here by others, but here are two more:
1) If you are running one of those inexpensive (thick and HEAVY blades), you will need a larger HP motor because it is taking a wider "swath" out of the rock and it also takes more oomph to make it go round because of the weight.
2) If you can possibly hook your motor up to 220V it will run cooler than a 110V motor. Most motors have a simple electrical diagram on the plate where you hook up the electrical leads that tell you which connections to hook your cord to for 110V and also for 220V. I have a 1 HP on my 24" Highland Park, hooked up to 220V and there is plenty of power for the largest rocks I can get into the vise. This motor has been in use on my saw for over 40 years and is still going strong.
Garry
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Post by Jack, lapidaryrough on Mar 4, 2009 1:53:48 GMT -5
All you need is a, Farm duty motor 1Hp.
On my 24" frantom saw, had the 3/4 Hp. and i changed it out to the 1Hp. Farm duty, Our you can go with the industrial grade is the next step. Fan cooled capacitor.
A old 3/4 Hp. is the same as a 1hp today as for the wiring in core.
Jack
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rivertoyz
starting to shine!
Member since November 2008
Posts: 27
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Post by rivertoyz on Mar 4, 2009 22:42:08 GMT -5
Where should I look for a motor? Diamond Pacific and Covington's is a no. Tried them both. Also, can you give me the specs on the 1 hp. I know 1725-1750 rpm. Do I need a capacitor start and run. Any advise or info. is appreciated. Thank you!! Robin
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Post by johnjsgems on Mar 4, 2009 22:59:07 GMT -5
Robin the MTR376 or MTR321 from Covington would work fine. You should check Needles/Bullhead areas for a farm supply type motor/bearing supplier. One hp (3/4hp would also work), 1725 rpm capacitor start, 56 frame, 115/230 60 Hz (so you can run either 115 or 230). You could also try A/C shops. You may be able to turn up a used motor.
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