byoungplumbing(at)gmail.c
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 Posted: Wed Nov 27, 2013 7:55 am Post subject: New Gear Legs, |
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Richard and others
my son bought a pipe / tube bender so he could fabricate roll cages for his and friends jeeps he has fabricated bunk beds for the kids, it is a heavy duty bender,,, it is floor mounted with 4, 1/2 inch bolts into concrete. it has replaceable dies that fit in the center and on the moveable arm that fit the diameter of the material you are bending. there is also a plate that is marked in degrees that can be rotated to any position, it has a little friction plate so it stays put while you are bending. and it has a fixed pointer that hovers over the degree plate. after placing the gear in the bender at the position needed to correct the problems. I adjust the degree plate to zero under the pointer, then proceed to bend. because it is spring steel. you have to try in small increments then relax and see if the steel has bent or only sprung then returned to normal. it seems that I had to take the gear to 10 to 12 degrees past where I wanted it to be in order to get the gear to bend, anything less than that and it would spring back to the starting point. 1/4 to 1/2 would have been considered a very large bend.... most of the bends I did was under a quarter of a deg. while trying, I would pull the bender to increasing number of degrees past where I needed it to be. and then relax in between. until it did not return all the way to zero on the pointer and plate. the increasing number would increase by very small amounts, once I kind of figured out how much past I needed to go... it was quicker on subsequent bends as I knew where permanent change to the gear would start to happen... so I could sneak up on the amount of movement needed quicker in order to get the bend I wanted. finally when I got to the end and I figured I needed 1/10th of 1 deg it was tricky, that is not a lot of bend,,, and if you go to far, you have to bend it back..... every time I would get noticeable change in the gear, I would re install and measure again,,, when I was close I would then take it for a hi speed taxi or short flight to see how it turned out. the gear comes out of the gear socket down to a bend just where the brake mounts, and the wheel fits on.... I did all the bends in the 6 inches or so just up from the factory bend. where the steel was small in diameter in comparison to the area just outside of the gear socket.
in my humble opinion... the factory bend, at least in my gear was too much, when I had the plane on stands and was installing the gear, the camber angle of the wheels looked real good. when I put the weight of the cage on the gear it still looked good. but when I mounted the 912, the gear started looking squatty. and when me and a passenger got in,,, the gear looked as if I had landed too hard and bent the gear.
when I got finished, I could take off and land without the oscillations fore and aft that would give a jackhammer ride. and I could inflate the tires without the plane wanting to veer all over the runway.
all the measurements were made with the wheels on a grease plate, I was too cheap to buy aluminum plates to put grease in between.... so I used some pieces of floor tile. if I rolled the wheel on the floor tile... sometimes it would break off the edges of the tile... so I had to jack up the wheel and place the floor tile under the wheel. it was amazing how much movement there is in the gear with the wheel on the grease plate. don’t try the adjustments with the wheel on the floor, there is too much friction and it would be extremely hard if not impossible to get where you want to be.
if I was going to install gear again.... I would use the strait edge method with a carpenter square with both wheels on grease plates. to keep the gear from going too far into the gear sockets, I would put in a piece of wood dowel in the gear socket followed by the gear. I would do all this with the engine mounted, and a hundred pound of wheat in both seats.
I am going to my sons for thanks giving, and could take pictures of his pipe bender if you would like.
boyd young
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