meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 12, 2011 15:06:45 GMT -5
Could someone please tell me if the following stats for a motor will be sufficient to use in a lapidary environment?
Mostly I'm wondering if it is waterproof enough to withstand the occasional small amount of water that may drip on it.
1 HP 1750rpm 3ph 460 Vac frame 143T TEFC enclosure
Thanks, :-) Dave
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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 May 12, 2011 16:59:11 GMT -5
Yep, do you happen to have access to 3ph 460 Vac?
Dr Joe
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 12, 2011 17:41:52 GMT -5
Joe,
I don't even know what that means? Does that mean that it will not plug into a regular outlet?
I know nothing about motors at all.
Thanks, Dave
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Post by jakesrocks on May 12, 2011 17:55:22 GMT -5
Almost all houses have single phase electricity at 110 volts. That's a 3 phase (3ph), 340 volt (340V) motor. It won't work on a normal household system. It would be very expensive to have 3 phase power and a separate meter installed in your house or shop. Also, a 1 horsepower motor would be overkill, unless you're turning a 36 inch saw. 1/3 to 1/2 horsepower should be all you'll ever need. Don
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 12, 2011 18:48:10 GMT -5
I see. Sounds like that is NOT the motor for me.
The reason I was looking for a 1HP motor is because I have two 1 1/2" 40 grit wheels that I use side by side so that they are touching on my arbor. When I work with heavy rocks that use up the entire 3" diameter of those 2 wheels, if I press hard enough, the wheels slow down to a point where they stop. I have even experienced this with a 3" 60 grit soft wheel.
I figured the 1 HP would give it extra power to not slow down or stop.
What do you think?
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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 May 12, 2011 18:59:13 GMT -5
No, that motor is not for you then, good commercial duty unit tho.
You can go with the 1hp, just find a continuous duty / 120Vac motor.
Some pool pump motors will work.
If you find something, snap a pic and get the specs and post it, we'll give you a hand.
Dr Joe
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Post by johnjsgems on May 12, 2011 20:01:09 GMT -5
1/2 hp, 115 volt, 1725 rpm. Look for ODP (open drip proof) or TEFC (totally enclosed fan cooled). Too much hp is not good either. A badly underloaded motor will run hot. Which reminds me, make sure motor says "thermally protected" with either auto reset or manual reset.
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 12, 2011 20:22:22 GMT -5
The motor I am using right now is 1/2 HP. And not only does it bog down on the 40 and 60 3" wheels, it also seems to run slow sometimes when I am cutting a 4"+ tall piece on the 12" saw that I have running on it.
Maybe I don't have my motor set up right, because should a 1/2 HP motor be performing as poorly as I am describing?
Dave
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Post by johnjsgems on May 12, 2011 20:51:25 GMT -5
What are the motor specs? Is this a home made unit?
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 12, 2011 22:04:49 GMT -5
Here are the specs on the motor. (see picture) I am not certain that I have it wired properly (that is on the right side of the picture) My arbor is home made. It is a 1" shaft. :-) Attachments:
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Post by johnjsgems on May 12, 2011 23:03:51 GMT -5
Seems like it should work. Wiring is simple. Install black from your cord to HI, white to COM. It should turn toward you. If you are turning heavy (like sintered wheels) you may need to either bump up to a 3/4 hp (same specs) or a higher torque capacitor start. Does this same arbor have the double wheels, 3" drums and a 12" blade?
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Post by jakesrocks on May 12, 2011 23:23:29 GMT -5
I can see one possible problem. The motor is rated at 1/2 - 1/4 HP. If the wiring is wrong, you may actually only be getting 1/4 HP and lower RPM's. Don
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Post by johnjsgems on May 13, 2011 8:30:18 GMT -5
Yes, that would be the low speed. I just noticed the TEAO which I believe is "totally enclosed, air over". That would be a fan motor meant to be in the blower housing so the air from the blower passes over the motor to cool it. The motor must run very hot and could cut out on the thermal overload on a warm day or under a load. Try to find a 3/4 or 1 hp that says "ODP" or TEFC".
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 13, 2011 10:25:52 GMT -5
Well, I checked the wiring and I had the black to HI and the white to COM. There was nothing connected to LO. So I think it was set up right? I reversed the wires (since they were both black and neither one was marked white) just in case that made a difference and so the wire that was on HI is now on COM and the wire that was on COM is now on HI. I didn't notice any difference when I did this.
I have been having this problem with each of: the two 40 hards back to back, the 3" 60 soft and the 12 saw blade, but I have only been running them 1 at a time. I don't cut that often, so my saw blade is off the arbor most of the time.
With a 1/2 HP motor am I supposed to press as hard as I can with the rock and there should not be any slow down? I didn't think that I was pressing that hard in the first place!
Dave
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 13, 2011 10:29:18 GMT -5
Oh and John,
The motor is not cutting out. It is just slowing down. And when I feel it slowing down, I let up on the pressure and then it accelerates back to full speed within a couple of seconds. I did purposely hold it till it stopped once, just to see if it would, and it did stop, but it did not cut off. And when I let up the pressure it accelerated to full speed within a second or two.
Dave
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Post by johnjsgems on May 13, 2011 11:30:02 GMT -5
If you are using diamond wheels you should not be pressing hard at all (unless you buy wheels from me). A light pressure and let the diamonds do the work. Even SC wheels are better (longer life) without jamming rock into them.
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rocpup
spending too much on rocks
Pink Limb Iris
Member since March 2011
Posts: 465
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Post by rocpup on May 13, 2011 12:07:18 GMT -5
Hi Dave I am a little late getting in here but I was wondering what RPM you are turning these wheels? What are the pulley diameters? What are the wheel diameters? Are they diamond or silicone carbide? I also was wondering how much pressure you need to put on these wheels? I would think if you put enough pressure on any setup you could stop the wheels from turning. 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 May 13, 2011 14:07:27 GMT -5
Funny...I was just wondering about your pulley setup (pulley diameters on motor shaft and arbor shaft) when rocpup asked the question.
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meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on May 21, 2011 14:17:54 GMT -5
I think that the pulley diameters are 2 1/2". I know for certain that they are the same size. And I am running at 1750 rpm
All of the wheels are 8" diamond wheels (hard or soft)
I hadn't thought that I was pushing too hard, but I do realize that I do not push lightly when using the 40 hard wheel. I just thought that I was pushing "medium" into the wheel. With a 40 wheel you can remove a lot of material in a short amount of time.
Basically I have learned how to push hard enough so that it is effective but not hard enough to slow down the wheel.
I guess if I am pushing too hard, my wheel will wear out too quickly.
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charles kuchar
spending too much on rocks
getting ready for the second coming
Member since November 2010
Posts: 300
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Post by charles kuchar on May 24, 2011 9:00:33 GMT -5
i just changed my 1/3 hp motor to a 3/4 aosmith motor that i got new for $50 from the farm store. he got a good buy on a bunch of them. anyway, it makes my saw work better. the 1/3 hp would slow down with not much pressure. now the 3/4 hp takes a lot of pressure to slow down. if it stops i relieve the pressure and it speeds up. i took the gravity autofeed off and am doing manual sawing. i like it a lot better but am still learning on getting thin slabs with manual feed... been putting a board to get the right distance from the blade and then getting the cut started straight, removing the board and then continuing the cut.
you would be happy with a motor big enought to do your jobs if you don't have to put a whole lot of money into it. charlie
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