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wheelshape to run on top of a circular rail?
a pair of circular pipes exists, running in parallel.
I wish to use them as tracks for a small railcar. where to buy wheels, whose "tread" surface is a semi-circle of the right size to fit over the pipes? very low speeds in this cargo application, friction-caused efficiencies should not be an issue. Or must they be made up by a shop on a custom order? |
wheelshape to run on top of a circular rail?
go to a fence supply store. they sell all sized rollers for gates that are
shaped to run on pipe rails. Don "Ed Ruf (REPLY to E-MAIL IN SIG!)" wrote in message ... On 4 Jan 2006 16:12:31 -0800, in sci.engr.mech wrote: a pair of circular pipes exists, running in parallel. I wish to use them as tracks for a small railcar. where to buy wheels, whose "tread" surface is a semi-circle of the right size to fit over the pipes? very low speeds in this cargo application, friction-caused efficiencies should not be an issue. Or must they be made up by a shop on a custom order? Can you use a standard v-groove wheel instead or do you need the full contact area between the two? http://www.mcmaster.com/ctlg/DisplCt...MMainWidth=915 -- Ed Ruf Lifetime AMA# 344007 ) http://EdwardGRuf.com |
wheelshape to run on top of a circular rail?
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wheelshape to run on top of a circular rail?
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wheelshape to run on top of a circular rail?
According to Brian Lawson :
On 4 Jan 2006 16:12:31 -0800, wrote: a pair of circular pipes exists, running in parallel. I wish to use them as tracks for a small railcar. where to buy wheels, whose "tread" surface is a semi-circle of the right size to fit over the pipes? very low speeds in this cargo application, friction-caused efficiencies should not be an issue. Or must they be made up by a shop on a custom order? Always amazes me that I can think up at least three simple things that I would have included right off to assist in an answer ,rather than a huge long thread, when asking for help in any "original post" asking for aid or information. Where are you located, roughly? What size is the existing "rail", and is it straight and level, or curved, or ?????, and what span between centres? What load capacity? Used Indoor or out, or both or combined or ???? And -- does the wheel need to drive the carriage along the rail, or just roll freely? My first suggestion in the latter case would be to find pulleys for rope or cable of the same diameter, and use those as wheels. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
wheelshape to run on top of a circular rail?
wrote in message ups.com... a pair of circular pipes exists, running in parallel. I wish to use them as tracks for a small railcar. where to buy wheels, whose "tread" surface is a semi-circle of the right size to fit over the pipes? very low speeds in this cargo application, friction-caused efficiencies should not be an issue. Or must they be made up by a shop on a custom order? I don't recall your saying what size the pipes were. As was mentioned by another poster here, wire rope pulleys are available in that cross-section. Lighter construction of the same type is available in fibrous rope pulleys. Some have integral bearings, others are just bushed. McMaster-Carr carries them in sizes to accommodate up to 1-1/4" rope. LLoyd |
wheelshape to run on top of a circular rail?
"Lloyd E. Sponenburgh" wrote in message ... wrote in message ups.com... a pair of circular pipes exists, running in parallel. I wish to use them as tracks for a small railcar. where to buy wheels, whose "tread" surface is a semi-circle of the right size to fit over the pipes? very low speeds in this cargo application, friction-caused efficiencies should not be an issue. Or must they be made up by a shop on a custom order? I don't recall your saying what size the pipes were. As was mentioned by another poster here, wire rope pulleys are available in that cross-section. Lighter construction of the same type is available in fibrous rope pulleys. Some have integral bearings, others are just bushed. McMaster-Carr carries them in sizes to accommodate up to 1-1/4" rope. LLoyd I used to have a horizontal photographic copy bench, and the carriage on it that held the camera ran on a pair of 2" diameter tubular rails. The carriage did NOT have wheels in the ordinary sense, but four sets of triple balls races, each set had its three races at 120 degrees to each other, so the contacting surfaces were the outer surface of the tubes and the flat surface of each outer race, thus they made line contact. The use of sets of three races surrounding the rails may not be suitable for your purpose, but you could use four PAIRS with the members of a pair set at 120 degrees to each, running on the upper part of the rails . This would give a very low friction running system, better than trying to use wheels with semicircular circumferences, which would have quite high wiping friction where the outer edges of each wheel wipe past the rails. Wheels with outer surfaces like vee pulleys would be better, but still have higher wiping friction than the pure line contacts of the outer surface of standard ball races. Dave.(uk) |
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