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Natural Science Forum / Physics / General Physics / July 2008Need help with nitinol motor Bribe offered
HI All. I am developing a motor using super elastic nitinol wire and have problems. Picture at: http://www.pacificsites.com/~snyder/motor.jpg The most frustrating problem is joining the wire together. I bought some tiny stainless steel tubing from Ebay. The idea is to use this as a sleeve and solder/braze it together. It hasn't arrived yet. I have been unable to find small high pressure crimp fittings. The second problem is the wire slipping on the pulleys. I will send anyone coming up with a solution to either of these problems a piece of wire to play with, assuming it is something I can use. Wire description at: http://www.pacificsites.com/~snyder/Ebay/Flexinol%20Test%20Data.htm This wire has a transition temp ~100C. This helps resolving the cooling side. The heating side can be easily insulated with cheap materials(styrofoam). I am hoping to put this on a bicycle and operate with solar power. Any comment/suggestions are welcome. Thanks in advance. Larry | HI All. I am developing a motor using super elastic nitinol wire and have | problems. [quoted text clipped - 12 lines] | solar power. Any comment/suggestions are welcome. Thanks in advance. | Larry Same answer as I gave in alt.sci.physics. > | HI All. I am developing a motor using super elastic nitinol wire and > have [quoted text clipped - 18 lines] > | > Same answer as I gave in alt.sci.physics. Hi. In case you missed my response in alt.sci.physics, please send mailing address and I'll send wire monday. Thanks Larry > HI All. I am developing a motor using super elastic nitinol wire and have > problems. [quoted text clipped - 3 lines] > solder/braze it together. It hasn't arrived yet. I have been unable to > find small high pressure crimp fittings. KISS - Keep It Simple, Stupid. Spot weld. > The second problem is the wire slipping on the pulleys. Spiral indent the wire, put tiny teeth on the pulley. You coud use edge-barbed tape. > I will send anyone > coming up with a solution to either of these problems a piece of wire to [quoted text clipped - 5 lines] > solar power. Any comment/suggestions are welcome. Thanks in advance. > Larry "I am hoping to put this on a bicycle and operate with solar power" A Fermi calculation carries more weight than hope. Neither one will carry the bicycle. If you want nitinol look to an upscale underwire bra.  SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 >> HI All. I am developing a motor using super elastic nitinol wire and >> have [quoted text clipped - 29 lines] > carry the bicycle. If you want nitinol look to an upscale underwire > bra. Hi Uncle Al. The spot weld idea is great but someone else came up with it first on another news group. I don't like the pulley stuff. Never the less, I like your style. Please send me a mailing address and I'll send the wire monday. Thanks. Larry > HI All. I am developing a motor using super elastic nitinol wire and have > problems. > Picture at: http://www.pacificsites.com/~snyder/motor.jpg The most > frustrating problem is joining the wire together. I bought some tiny > stainless steel tubing from Ebay. The idea is to use this as a sleeve and > solder/braze it together. It hasn't arrived yet. On some radio control model aircraft control wires are joined by passing the wire through a tube and crimping with round nose pliers. Usually passed through the tube twice. > The second problem is the wire slipping on the pulleys. Tensioner? > HI All. I am developing a motor using super elastic nitinol wire and > have problems. [quoted text clipped - 3 lines] > sleeve and solder/braze it together. It hasn't arrived yet. I have > been unable to find small high pressure crimp fittings. Tiny rubber finger torture device. Slip in each end and they won't pull out as long as the outward pulling pressure stays. :) > The second problem is the wire slipping on the pulleys. Rubber coat the pulleys. Undercoat spray for cars should work nice. :) and... Don't worry about sending the wire, :) SignatureJames M Driscoll Jr Spaceman > HI All. I am developing a motor using super elastic nitinol wire and have > problems. [quoted text clipped - 11 lines] > solar power. Any comment/suggestions are welcome. Thanks in advance. > Larry Silver solder or gold solder: http://www.indium.com/documents/applicationnotes/97759.pdf Tom Davidson Richmond, VA > HI All. I am developing a motor using super elastic nitinol wire and have > problems. [quoted text clipped - 12 lines] > with solar power. Any comment/suggestions are welcome. Thanks in advance. > Larry As pointed out by Colin Watters in this thread you will need a tensioner in your system. (news:<fPOdnbo8qcMiMPPVRVnygQA@posted.plusnet>) To reduce slippage can you wrap multiple turns around the pulley? Better yet can you obtain flat banding? This will alleviate slippage and facilitate joining. A capstan drive (similar to what is used in tape recorders) can then be applied to reduce slippage. As for joining, take your pick of rivet, glue, solder or weld. Dan Thomas On Jul 4, 11:38 pm, "Daniel A. Thomas" <datho...@xspamxistar.ca> wrote: > > HI All. I am developing a motor using super elastic nitinol wire and have > > problems. [quoted text clipped - 25 lines] > > Dan Thomas On Jul 4, 11:38 pm, "Daniel A. Thomas" <datho...@xspamxistar.ca> wrote: > > HI All. I am developing a motor using super elastic nitinol wire and have > > problems. [quoted text clipped - 23 lines] > can then be applied to reduce slippage. As for joining, take your pick of > rivet, glue, solder or weld. Depending on the amount of wear and tear expected, one could treat the pulley itself with a material that will increase friction. I once solved a slippage problem in a low torque application between a metal pulley and a metal belt by installing a neoprene band in the groove around the pulley. (Sorry for the previous null post) Tom Davidson Richmond, VA On Jul 4, 11:38 pm, "Daniel A. Thomas" <datho...@xspamxistar.ca> wrote: > "Larry Snyder" <lsny...@pacific.net> wrote in message > [quoted text clipped - 30 lines] > can then be applied to reduce slippage. As for joining, take your pick of > rivet, glue, solder or weld. Depending on the amount of wear and tear expected, one could treat the pulley itself with a material that will increase friction. I once solved a slippage problem in a low torque application between a metal pulley and a metal belt by installing a neoprene band in the groove around the pulley. (Sorry for the previous null post) Tom Davidson Richmond, VA ============================================ Slippage: http://www.theaa.com/motoring_advice/audio/drive_belt_slip.mp3 > On Jul 4, 11:38 pm, "Daniel A. Thomas" <datho...@xspamxistar.ca> > wrote: [quoted text clipped - 48 lines] > > http://www.theaa.com/motoring_advice/audio/drive_belt_slip.mp3 Sounds like my dad's old Ford. We treated the surfaces of the belt that contact the pulleys with bar soap and the slippage stopped. Tom Davidson Richmond, VA On Jul 5, 8:32 am, "Androcles" <Headmas...@Hogwarts.physics> wrote: > "tadchem" <tadc...@comcast.net> wrote in message > [quoted text clipped - 55 lines] > > http://www.theaa.com/motoring_advice/audio/drive_belt_slip.mp3 Sounds like my dad's old Ford. We treated the surfaces of the belt that contact the pulleys with bar soap and the slippage stopped. Tom Davidson Richmond, VA ============================================ We were more high-tech than that, we used lady's hair spray, much easier to apply when running. My old pal (he died recently) used to adjust tappets with the engine warm and running until the clicking stopped. No feeler gauges needed. http://www.dansmc.com/tappets4.jpg I could never get the driver to stay on and did it by the book. It sounded terrible, just like an old Ford should... > HI All. I am developing a motor using super elastic nitinol wire and have > problems. [quoted text clipped - 12 lines] > with solar power. Any comment/suggestions are welcome. Thanks in advance. > Larry HI All. I posted this on several newsgroups and got a lot of responses. I would like to thank everyone for their input. The answers that I like are: capstain/multiple turns around pulleys use tubing for guide and spot weld grooving pulleys for more surface area crimp fittings from fishing supply store idlers/belts to apply extra pressure on pulleys Answers I didn't like: coating pulleys with nonslip stuff- wire pressure too great. will fail too fast. I have notified people with the above ideas and will offer wire only for some other ideas. Thanks for your interest. Larry |
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