Moter shafts and other modle repair tips

frostbitfrostbit Club Members Posts: 14
    I often see in dechuntion, fokes trying to find moter shafts. So heair is how to make em. Say you need a 3.17 shaft and can,t find one. Buy a peace of 1/8 spring wire, you'll also need a sheet of 400 wet or dry paper and a drumel tool with a thin stone cut off disk. Cut about 3mm off one end of the wire to leave a true size end. Use the 400 grit paper back and forth on wire while turning constantly with other hand. Check fit often with bearing, you want to be able to push bearing onto wire and feel resistance for a lenth of wire as long as the shaft needs to be. Use the cut off disk to cut grove for retaining clip, and flats for set csrews. Cut shaft off wire, chanfer edges and your ready to go.

     For harder shafts you can buy hardended doll pins or reamer and drill blanks from an industrial supply Co. such as MSC.

     Your first shaft may take several hours to make if you have to paper it down.

     Use a tuch of lock tite or CA glew on screw threads on final assembly. Rool shafts on a peace of glass to check for stright.


                      Thanks Frostbit


  • frostbitfrostbit Club Members Posts: 14
    Next tip, snug fitting holes.

         How to make a D reamer or drill so control horns or ply worshers fit real snug. Tack a short peace if spring wire the same size as your control wire, or axel, wheat ever you need to fit snug. Sherpen it to a point on the scail of what a well sherpened pensel looks like. You can do this with dremell tool, bench grinder or in a pinch a smoth file. Now for the distance of the tapor + about 1 to 2 wire diamators grind to the center of the wire so the profile looking stright on is a D. Grind slowely and cool often so the wire never goes blue from heat. The finished peace can be epoxied into a short chunk of 1/2 wood dowl to form a handle for hand reaming control horns. Or used as is in the drumel tool or electric drill to drell holes in plywood. You want to drill slow speed as the spring wire is carbin steel and drilling at high speeds could heat it hot enouf to draw it back soft. As plastics and woods drill tight and a single edged drill won't worler the resalting hole will be real tight, and a small amount of sizing with the same tool will be required ro get ferction less fits.

  • frostbitfrostbit Club Members Posts: 14
       Brackets to atach spring wire landing gear to plane made from alumium can.

          Theairs a surples of thin alumium at no cost just wating to be used, "but be carful its sharp". Take your favert pair of hobby sisers and cut the top and botum off an alumium bevreg can. Now cut the cilender up one side and unroll. For a small bracket for 2 - 2.5mm or 3/32 wire cut a strip 5/8 by 7/8 in. ( 16mm by 22mm ). Now hem 1/8in (3mm) each side of long side. (A hem in sheet metal work is foldind an edge over on it,s self) Lay your peace of hemed metal on a hard serfice hem edges up. Lay a peace of spring wire the size of your gear on top of it cross wise and fold it over the wire so the tips of alumium are close to even. Use a hard object with a 90deg. corner to force the alumiun down as close to wire as posable. Take a small flat washer and set it on your alumium peace so it tuches the 90deg. corner you just made. Mark the washer hole with a scribe or felt tip pen. Now place on a scrap peace of wood and use a prick punch to make a hole for a screw. These little brackets lay nice and tight, are lighter then nylon ones that do the same thing, and will give and rip in a crash. For those of us that have more Time then Money, works great.
  • frostbitfrostbit Club Members Posts: 14
        Arrow shafting.

           Arrow shafting is wonderfull stuff. Theair are several types, alumiun, carben fiber, fiber glass, and wood. I an going to discuss alumium as a ade to moulding. Theair are two grades of alumium in use 7075 and 8087 both are realy strong, but the 8087 is extre strong and hard. Alumium shafting is sized by a anumber system composed of four digets. The first two digets indecate the external dimentiom in 64ths of an inch. The second two numbers indecate the wall thickness in thoundns of an inch. So for an example 2415 would be 3/8 od. with a 15 thoundends wall thickness. So what can you do with it? Wing spars, ferrals, dowls, tube framing, standoffs, and as it can be goten in sizes that will just fit in to one an other telacoping long sections. Thus our 2415 has an Id. of .345 so a shaft with a outside number of 22 has a Od. of .3434 it will gust slip inside with room for a tuch of CA glue. Lit your emagenation be your guide.
  • Bill RussellBill Russell Club Members Posts: 4

    Thanks informative

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