DelRay
Posts: 220
Joined: 4/12/2007
From: Cedar Rapids,
IA, USA
Status: offline
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Thisoldman, I didn't have a drawing, just some scribbles on my work pad that I use for any mods I've made, but I did draw out the concept to give you an idea of how I'm doing it. I'm sure there are other means of getting the job done, but this one worked the best for me. It's pretty straight forward, the air pressure under the o-ring forces it out into the brake drum.There are certain areas that are critical and tolerances must be kept a little tighter, but you can experiment and see what works for you. The width of the o-ring groove in the backing plate can be a real head scratcher until you get it to fit the o-ring that you decide to use. The o.d. of the o-ring used is somewhat determined by the size of the wheel you're going to use, and this translates to the o.d. size of the backing plate , etc. I've shown a set screw to hold the backing plate onto the axle, I use a blind hole located in the backing plate and machine a longer oleo hinge pin and it's seated in that blind hole on a strut application. The spacing of the backing plate from the gear can be changed by adding a little hub on the backing plate when machining it. I use Nylon bar stock and machine washers for clearance between the wheel and backing plate. I also machine bearings that are fitted into the wheel pieces, these are one piece, full wheel width. I usually drill and ream the axle holes in the wheel pieces at .375, this gives room for the Nylon bushings and gives the bushings a decent wall thickness when using the .250 axles I usually use.
I have a rotory head that I use to lay out and drill any hole pattern on the outside of the wheel, you can design the pattern to your likings, going slots, holes or whatever you like. I use this to also lay out and drill and tap the holes for the machine screws that hold the two wheel pieces together. I machined a set of aluminum "mags" for one of my RC trucks, I used the older slotted hole design for the design. I hope my ramblings help you a little and give you some ideas, it's fun to experiment, and is very rewarding when it works.  Let us know how you're doing on the project.
Edited for: For some reason I'm unable to upload my pic file at this time, I'll try later
< Message edited by DelRay -- 5/1/2008 1:03:50 PM >
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AMA # 173709 Have traveled to the East
I.M.A.A. # 4971 Amateur call WB0KFB
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RE: Nosen Cessna 310 - 
