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Post by glennz01 on Aug 20, 2014 21:15:36 GMT -5
I got an old nelson 8-10 inch rock saw for free with an old tumbler base... The saw i need to do some wiring and it should run... It has mechanical power feed to it. Once i get this running it will probably be my main saw. The tumbler base is fairly simple the motor is currently frozen though.
If anyone knows how to unfreze motors or has tips / tricks please let me know
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vugs
starting to spend too much on rocks
Rockbiter
Member since February 2014
Posts: 225
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Post by vugs on Aug 20, 2014 21:19:47 GMT -5
Would love to see a pic of the Nelson. Congrats!
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Post by glennz01 on Aug 20, 2014 21:30:30 GMT -5
Yeah i didn't have my camera today, next time i go to where my lapidary stuff is i will get a pic.... currently the inside is all nasty and covered in oil or sludge... At least i don't need to use oil to cool the blade down
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,709
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Post by Fossilman on Aug 20, 2014 22:08:15 GMT -5
Electric motors are very inexpencive.....
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Tommy
Administrator
Member since January 2013
Posts: 12,881
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Post by Tommy on Aug 20, 2014 23:12:02 GMT -5
Yeah agree with Mike - it's probably easier to buy a new motor than to take that one apart and fix it.
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Post by glennz01 on Aug 21, 2014 0:06:13 GMT -5
This motor is a little different than most everyone is used to. The motor is stuff but does spin.... does that mean that the problem is in the chord that goes to the wall?
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Aug 21, 2014 0:13:30 GMT -5
I've oiled up several motors that were just very dry from setting too long, and they ran fine. Generally easy to take the ones apart that don't have external re-lube provision and oil up the wicks around the bushings {sleeve motor} or replace the bearings on ball bearing motors. Good second hand motors aren't plentiful or inexpensive in this area. Looks like we were both writing at the same time, yes, it must have power.
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Post by glennz01 on Aug 21, 2014 0:33:18 GMT -5
I just put some 4d-40 on it, everything turns after having it apart... if it still doesnt work i will try to replace the chord.. Here is a pic, the motor is just placed back together but it is still not screwed back.. there are gears you can't see on the right angle part. I would like to keep as much original as i can. You can see the belt and other larger pulley wheel
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Aug 21, 2014 0:47:10 GMT -5
Could be the switch is dead, a VOM or battery powered test light makes checking easy.
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Post by glennz01 on Aug 21, 2014 0:49:38 GMT -5
Could be the switch is dead, a VOM or battery powered test light makes checking easy. The switch you see there is very simple... it turnes and ether makes contact or it doesnt... it should not be the problem... there is a small frey in the chord that might be the problem... not sure
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Post by johnjsgems on Aug 21, 2014 10:05:39 GMT -5
A cheap volt/ohm meter would help. Check for voltage at the motor terminals with cord plugged in and switch on. No matter how "simple" a switch looks the contacts can go bad. If no power to motor check at both sides of switch. First thing I do with all used equipment (mostly buy for resale) is install a new grounded cord. If the motor turns freely but locks up when you try to start it it is a motor issue. Weird right angle drive could be stripped gears too. If you can remove it you could check motor without.
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Post by glennz01 on Aug 22, 2014 0:58:29 GMT -5
Well i re-wired the motor chord for the tumbler motor and the motor is shot. it gets power going into the motor but it doesnt spin. The coiling does look like it could be bad.
If anyone by chance has this motor i would be willing to buy it.
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stephent
starting to spend too much on rocks
Member since March 2014
Posts: 213
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Post by stephent on Aug 22, 2014 8:52:24 GMT -5
Is that a brush type motor? Something is nagging at the back of my mind about the little boss area on the side next to the switch (if so there should be one straight across from that one).. If it is a cleaning of the commutator might help. Or a new set of brushes.
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Post by glennz01 on Aug 22, 2014 10:23:51 GMT -5
It is a brush motor. I can get a pic of the inside tonight if that might help.
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Post by Peruano on Aug 22, 2014 13:01:00 GMT -5
I'd take it to an electrical shop and have someone who understands motor brushes, and windings look at it. It may be simple but not fixable in the hands of the innocent (myself included so no insult intended). I too want to see that saw. Don't discount oil until you run it with oil. Its just so handy to not have to worry about rust and it keeps my hands smooth. Tom
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Post by glennz01 on Aug 22, 2014 17:55:50 GMT -5
I think its larger than a 10 inch so i probably will use oil.
I will get a photo of the saw Monday or Wednesday
As for the motor a guy on ebay might have one to replace it that works I will try to take the switch off and make it direct and see if that does anything.
My co-worker looked at it and said he though the motor was burnt out as some of the wiring was black on the outside.
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Post by glennz01 on Aug 22, 2014 18:04:15 GMT -5
I know i need photos but i looked and for a nelson saw at roughly the same blade dimensions, working this thing is worth around $2,250 Would that be right for this saw? I have no intentions of selling it but i am just curious as that seems high... When i do post ohotos if anyone could date it that would be great... i know its probably pre 70s
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Post by orrum on Aug 22, 2014 18:16:13 GMT -5
I am a cowboy..... If it aint workin hit it with a wrench or hammer. Cant hurt if its shot but lots of times it fixes whats ailin!
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Post by glennz01 on Aug 23, 2014 1:28:49 GMT -5
I got a friends dad who knows something about motors.. i did some tests with the meter and found out where it is bad.. might be easy to fix if the coils can come out to get to the bad part.
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Post by glennz01 on Aug 26, 2014 19:16:53 GMT -5
Well I got photos of the Nelson... put some wires to where they should go (non permanent) and it works just fine... I cit a little thing earlier... I will probably still use my 16 inch as my main saw as this cuts very slow, so i will use it for just large stuff and walk away. The blade itself has diamond bits but the metal is rusting away so with the current blade i am just going to use water.. If anyone can put a value on this thing that would be nice... all works just needs to be cleaned up. My co-worker thinks its only worth $500 fully working and repaired but i think its worth more.. just not sure how much more... Main reason i'd like to know is so i know if i can start modifying it and doing other stuff.... It has a 1 HP motor on it..... I'm thinking about getting another belt to make the autofeed spin faster.
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