Lapidaryforum.net
Gadgets, Gizmos, and Dohickeys => Tool Talk => Topic started by: Bluetangclan on October 10, 2017, 07:12:23 PM
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I was trying to cut a jade slab today and my saw decided to run off and on and then not really work at all. Almost as if I was turning the speed up and down even though I had it at full blast. It didnt seem hot when I took the saw apart. Was thinking maybe I had water on the electronics part of it? Hoping the motor didnt burn up since I bought it used a few months back.
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Did the motor actually stop? If not, check the blade tightness. Sometimes if it is loose it will act like that.
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Oh yeah, its the motor not the blade. But the motor doesn't sound stressed, it just goes up and down in power. Made cutting my jade kinda a no go.
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if it was a car i'd say it needs oil. don't think it applies here :icon_scratch:
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The only thing that controls the speed of an induction motor is the number of coils vs ac frequency. If the speed is varying then I would have to assume a bad coil connection or shorted coil. Either way it is unlikely that it can be repaired.
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Grrr.That would annoy me to no end being so new to me. Going back to a tile saw, if a lapidary saw can break that easy then they aren't worth the money it costs to build them. Just have to get a small lower power one for opal and a more powerful one for everything else so I don't have to keep changing blades.
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Another problem with motors can be the wiring connection for the AC. If any of the connections are loose or corroded you can get speed variance. This can also be dangerous and spark a fire. Check your connections into the motor to make certain they are tight and clean. If you have a plug try and look for signs of wear or if the wires are screwed on tightly if that applies. Same goes if there is a capacitor on the motor, check all connections. Extension cord connections can do the same if there is not good contact.
good luck
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sounds more like a feeding problem, rock is being pushed into the blade too fast. Mine does this and i have to loosen the belt just a touch so the feed belt (NOT the main drive belt) will slip on the pulley.
Once i do this my motor will run at full speed, i also touch the cutting face of my blade with a light duty tile hammer (flat smooth face hammer) hitting the cutting edge slightly to make a different cutting face on the blade.
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i also have to plug in and unplug my saw to turn it on and off. my plug wears out yearly. i have to replace the cord every year. since i dont have a covered area to cut rocks i dont have it hard wired to a switch.
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I tried running it without rock. That's when it started going up and down in power. I wonder if just the motor can be replaced. I do like the ease of use without the loud blaring sound and mess of a tile saw. When I get home today Ill try running it again and see if it was some kind of water damage. I have plenty of stuff that doesn't need a saw to work on in the mean time. Any good tile saw suggestions?
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what brand of saw is it, what type of motor, how old? You said" even though I had it at full blast" is it a variable speed? Used motors can be had pretty cheaply try Craigs list, local pawn shops, and yard sales. Motors wear out thats just a fact no matter if it's a tile saw or not.
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https://www.facetshoppe.com/cart/02-220.html its one of these although I had thought it was a 6" blade.
Seeing a couple tile saws here in my price range http://www.dadsrockshop.com/trimsaw1.html
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I have been an electrician for over 40 years. Check all of the connections from the outlet that you plug into (could be in the shop wiring) too the motor. Look for any hot spots. I would also check the voltage at the motor. Best to do it while running the motor. It could be a problem with the motor? It would be easier if I could look st it. Good luck
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Good news. That is a universal motor. Speed is controlled by changing the voltage. The problem is going to be found in the in the speed control or connection thereto. It should be a simple fix. Worst case would be a new variac.
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And the gauge of wire used!
My ears haven't read it.
10 - 12 gauge depending on amp load , wall plugs today / duplex's connection wont carry the amp load.
most homes today have 14/gauge wire on 15 amp breakers.
I'm no electrician, just maintenance. Comm. & Industrial are best to use. You wont fine them at home DEPOT or the other ones like - ace hardware....
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I don't think I have seen a reference to the make of saw. Is it a mechanical feed like the old Highland Park saws or Electronic feed like a Lortone. I have had the feed motor start going which caused the on/off sound of cutting as the feed would continually engage and disengage. If it is Electronic feed try running the motor direct to current with the feed switch out of the equation and see if the motor or sound varies.
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???? It sounds like you are talking about a light duty 6 inch tile saw, not a slab saw. Please be more specific so we are not spending time trying to think 1/3 HP or larger motors and 15 amp circuits. The rest of the story please...
I have used numerous tile saws from Home Depot and Harbor Freight. You get what you pay for and they work just fine as trim saws and slabbing little stones by hand.
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He was specific.
https://www.facetshoppe.com/cart/02-220.html its one of these although I had thought it was a 6" blade.
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Good and bad news. I got it to work. Definitely the motor. I got it to work by hitting it with a crescent wrench a few times until it ran at speed. Was able to finish cutting the jade pieces I needed very easily when it runs at full speed. Obviously not a permanent fix so I will look into finding a replacement motor, looks easy enough to swap out if I can find the model I need.
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rusted bearings?
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Sorry I didn't see that link and I thought I read all the responses. I bought an ameritool trim saw and it was junk. The housing that the motor is in is not sealed and the motor is held in place with automotive hose clamps for a nice true 90 degree cut (if you have your hose clamps calibrated, lol). The water gets into the motor quite easily and I had mine quit because some did make it in so I had to take it apart and clean it out. Mine always sounds like it is not going to make it thru trimming a cab out of a 5.mm slab. Fortunately I only bought and use it for material that doesn't like oil
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That is exactly what I have, hose clamps and all. Water was indeed my first suspicion as well. Its working but I think I will stick to using it for opal and soft stone. Whats a good not too expensive slab/tile saw?
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"Whats a good not too expensive slab/tile saw?"
Kind of mutually exclusive terms. :LOLOL: My personal opinion is that Lortone walks the line between low cost and useable equipment. There is certainly better but if you go any cheaper you get problems. Tile saw can be used for trimming but slabbing with anything other than a slab saw will always be iffy.
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http://www.johnsonbrotherslapidary.com/Rock_Rascal_Saw_Model-J_Basic.html
These are pretty basic if you watch ebay they do show up used a used motor (1/3hp) can be found pretty cheaply, I think the Lortone has a bigger table , not sure, so that may be more desirable. Repair parts should be readily available and there is not really much to go wrong with them, bearings and shaft about it. Either should last a lifetime.
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Saw the reference to Ameritool. Their website describes what sounds like a DC motor similar to what Inland uses. If that's correct I know from experience that type of motor is less reliable over time. Belt-driven saw with AC motor will be more dependable.
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http://www.johnsonbrotherslapidary.com/Rock_Rascal_Saw_Model-J_Basic.html
These are pretty basic if you watch ebay they do show up used a used motor (1/3hp) can be found pretty cheaply, I think the Lortone has a bigger table , not sure, so that may be more desirable. Repair parts should be readily available and there is not really much to go wrong with them, bearings and shaft about it. Either should last a lifetime.
i thought the "johnson brothers" went out of business? nice to know they are still around.
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Before you junk the motor, try to plug a lamp into the same outlet and turn it on. Run the saw. If the power (of the saw) goes up and down and the light brightens and dims you may have bad wiring in the walls. Tis the season for mice and such to move in. I've seen some very weird wiring by some very knowledgeable people. Good luck
Steve