rastageezer
starting to spend too much on rocks
Member since December 2013
Posts: 169
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Post by rastageezer on Mar 27, 2016 21:19:56 GMT -5
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Post by jakesrocks on Mar 27, 2016 21:42:15 GMT -5
The best gearmotors are no longer available. They came off of old IBM copy machines. The folks who are building the new version of the old Highland Park sphere machines bought up all remaining stock of the motors.
Look for a gear motor that runs between 90 & 120 RPM's. The higher the inch pound rating at the output shaft, the better.
Keep an eye on ebay & the others for surplus gear motors. You might luck out & stumble on some of the old copy machine motors . If you do, buy all that you can afford. If you don't use them, there's always someone on here looking for them.
When I bought motors for my machine I saw that they were going fast. I bought 2 spares to have on hand in case one of mine died.
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scottyh
starting to spend too much on rocks
Member since November 2007
Posts: 181
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Post by scottyh on Mar 27, 2016 21:48:34 GMT -5
Old style Toyota Land cruiser windscreen motors are up to the job. In our club that is what most of the sphere makers swear buy. However one thing they say is that they do run hot.
Cheers Scott
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scottyh
starting to spend too much on rocks
Member since November 2007
Posts: 181
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Post by scottyh on Mar 27, 2016 21:48:58 GMT -5
Opps should have read swear by
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scottyh
starting to spend too much on rocks
Member since November 2007
Posts: 181
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Post by scottyh on Mar 27, 2016 22:02:44 GMT -5
The old style Land Cruiser motors were really heavy duty... yep the got hot because they weren't meant to run 24/7 however they do work and they do keep going. No one is using newer componentry as it is not heavy duty enough.
Cheers Scott
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bills
noticing nice landscape pebbles
Member since March 2016
Posts: 93
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Post by bills on Mar 27, 2016 23:01:10 GMT -5
The Baldor gear will not work unless you have 3 phase power, most homes do not. bill
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bills
noticing nice landscape pebbles
Member since March 2016
Posts: 93
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Post by bills on Mar 27, 2016 23:08:53 GMT -5
Good luck
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Post by Rockoonz on Mar 27, 2016 23:40:26 GMT -5
@rockinrick The mig welder operates by using capacitors and a transformer, which are not at all sensitive to your redneck 3ph having one leg 60 degrees out of phase. The only negative is a shorter duty cycle with a welder and the increased cost of electricity. A motor is an entirely different subject, dirty power will cause them to produce a lot more heat, possibly enough to fry the motor or start a fire.
Plus the single phase Bodine motors in your links have a better RPM anyway.
172rpm is too fast
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Post by jakesrocks on Mar 28, 2016 8:21:07 GMT -5
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jerrys
spending too much on rocks
Member since February 2014
Posts: 263
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Post by jerrys on Mar 28, 2016 11:48:19 GMT -5
172 RPM is probably on the upper side of fast for doing the initial sanding. However, it would work good for polish. I have seen a polish setup running around 220 to 240 RPM that worked beautifully. Since you are building your own, consider building two, one for sanding and one for polish. Keep the polish machine in a different room to minimize contamination.
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Post by jakesrocks on Mar 28, 2016 14:35:36 GMT -5
This is a small vintage 2 head that turns at about 110 RPM's. When I'm ready to polish I take the cutters off, clean them real good and wire a piece of soft leather over each. With a little cerium oxide in a cup, and a small brush I can get a high polish on spheres in just a few minutes by keeping just a small amount of CO & water on the sphere. An extra high speed machine is a "nice to have", but not really needed unless you're going into mass production to sell spheres. This machine is down at this time to replace bronze bushings & redo the wiring to modern standards.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 28, 2016 14:52:52 GMT -5
I have some spare sphere machine motors. The exact ones you wanted. PM if interested.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 28, 2016 14:58:11 GMT -5
Now I'm having second thoughts on doing spheres at all. Does everyone who does spheres need two machines? In separate rooms? Tell me that is like, a luxury, please? If I really have to keep polishing and grinding operations separate I will just forget the sphere stuff. I am retired and on a fixed income and even though I will build my own to save money, there is a limit on what I can do. Also who is right here? Someone says 172 is too fast and some one else says maybe not. Why did I ask about this subject in the first place ? I must be insane!!You can polish on the rough machine. Cleanliness is key. Because I use diamond core bits for rough grind and granite pads for prefinish, I don't have the loose grit issues. In my lapidary class some dudes polish on the rough machines. They use grit and clean up very well between steps.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 28, 2016 15:21:09 GMT -5
I have some spare sphere machine motors. The exact ones you wanted. PM if interested. What I really wanted was the ones that other people use but I see they all got bought up. Do you have some of those extra? I PM you. Yes the exact gear motors you seek. Also a sphere machine complete.
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Post by jakesrocks on Mar 28, 2016 15:52:41 GMT -5
Dang, so you're the one who bought up all the motors. I'm lucky I bought a couple spares when I did. LOL
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Post by jakesrocks on Mar 28, 2016 18:29:05 GMT -5
Bodine motors are good ones. The only drawback I see is they're open motors. You'd have to devise a way to protect the motors from water spray. Also, in the notes above the description it says it needs a relay for the start windings. The company is certainly a trusted one. It's where many of us home builders bought our motors. Try contacting them to see if they can advise you about the relay, and possibly supply you with a wiring diagram.
With the right pulleys, there's no reason why those wouldn't work.
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Post by jakesrocks on Mar 28, 2016 19:46:01 GMT -5
Did you notice in the description of the Bodine motors, the output shaft is a metric size ?
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Post by jakesrocks on Mar 28, 2016 19:49:30 GMT -5
Yep, it wouldn't be too hard to bend up three pieces of sheet metal in arcs and powder coat them for rust resistance and mount one on each motor. It's just a sphere machine though, turning slowly with a drip supply of coolant. How much spray can it generate? They have a wiring diagram link right there on the sales page and I can get the relay for under $8.00. I think I've found my motors. Thanks everyone for your help and input [/quote] You'd be surprised at how much water & grinding mud those things can throw off. Even at low speed. Better safe than sorry.
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Post by jakesrocks on Mar 28, 2016 21:36:49 GMT -5
Did you notice in the description of the Bodine motors, the output shaft is a metric size ? Yep, they are .004 larger than 5/8" Should fit with no problems. That is actually just 2 thousandths at any one spot between the pulley and shaft (because opposite that spot is the other 2 thousandths.) Maybe just the tiniest bit wobley until you tighten the set screw down. Take a caliper set and open it up to 2 thousandths. You will see what I mean. The low rpms this thing will turn is slow enough that even a slight out of round (4 thousandths out) situation wouldn't be too much of a problem between pulleys. Where I used to work we built glass cutting machines with tolerances that big. The machine shop was allowed plus or minus 5 thousandths. Weldments from the fab shop were allowed 1/16" LOL, I'm a retired sheet metal man. Worked on nuke subs & subcontracted on the first few B-1 bombers. I know all about tight tolerances.
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Post by spiceman on Mar 28, 2016 21:58:25 GMT -5
I don't know where your from but living in Ohio there is a place 3 stories and one floor is strictly motors. Mendolsons is the name of the place and its like a big garage sale. More motors than you can dream of.
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