meta7
starting to spend too much on rocks
Member since June 2010
Posts: 164
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Post by meta7 on Sept 7, 2010 22:51:28 GMT -5
Another home-made equipment question from me. This forum has been so helpful to me and I thank everyone who has responded to my previous posts very, very much. For a 1" thick precision shaft (not stainless, I was told that it is called drill rod), how many inches can the shaft extend beyond the bearings before it starts to wobble? [running at 1725 RPM] If the answer depends on how much weight is on the shaft, then I would say 2 grinding wheels. I am working on a making a piece of equipment and I am going to get the shaft cut and threaded soon and I want to maximize my space without getting wobble. Thanks again, ;D
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Post by johnjsgems on Sept 8, 2010 8:01:56 GMT -5
Covington standard arbor comes with a 18" shaft (arbor is 12" wide). You can buy longer shafts to 36" for that arbor. That is 12" extending beyond their bearings. I'm guessing you could put 3 wheels on a side but I would rather have two with more space between. By the way, shaft is called "cold rolled shaft stock". It has to be completely round and sized precisely. I've never heard it called drill rod. Not stainless will work fine if you coat any metal to metal surfaces with antisieze, grease, etc.
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Post by jakesrocks on Sept 8, 2010 9:03:20 GMT -5
If you're having a shaft made, be sure to specify left hand threads for the left end of the shaft, and right hand for the right. You might want to have the right end center drilled and tapped for 1/4 - 20 threads. This will allow you to add a spin on disk or buff to that end. I've heard it called drill rod or cold rolled steel. Both are the same material. I coat my shafts with a good grade of wood workers finishing wax. It needs to be re- done about once a year. 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 Sept 8, 2010 14:23:24 GMT -5
What would be the maximum length beyond the bearings for a 3/4" shaft?
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Post by jakesrocks on Sept 8, 2010 15:12:31 GMT -5
Diamond Pacific uses a 5/8" shaft with 1" adapters, and runs 6 wheels with the ability to add discs on both ends. With a 3/4" shaft you should be able to run 6 wheels with no problem. Just put spacers between your wheels to give at least 1" between wheels. Since most common wheels have a 1" bore to start with, why not use a 1" shaft ? It will give you added stiffness, and you won't have to use wheel adapters. Don
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Post by johnjsgems on Sept 8, 2010 15:22:31 GMT -5
I don't know but the 5/8" shaft on the Genie sticks out 5 1/4".
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spicer m
spending too much on rocks
Member since October 2008
Posts: 337
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Post by spicer m on Sept 8, 2010 22:35:16 GMT -5
Drill rod is used to make tools out of, like punches of other things that you want to harden. normally hardened with oil or water. Not the best thing to make a shaft from. Cold rolled steel is rolled cold to get it to size. It will work but not the best thing for a shaft. I think The best thing to use for a shaft and to machine is; TGP 1144 Stress proof shafting. TGP stands for Turned Ground and polished. It is free machining (easy to machine and will not warp when machined. Here is a link to shafting, I have never bought from them but there prices seem to be inline with what I have payed www.metalexpress.net/cgi-bin/index.pl?&=&ac=acDisCatList&mod=catalog&material=Carbon%20Steel%20Cold%20Roll&sid=27269071aea2b31f95df16359a093f23Mike
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CallMeShane
starting to spend too much on rocks
Member since August 2010
Posts: 112
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Post by CallMeShane on Sept 9, 2010 6:12:58 GMT -5
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