AM Shifter Assembly Question

[lukevanoort]

Originally Posted by haroony341

hey, i have another question about the gearboxes,

there is no room for us to be able to mount the gearbox lever with the wheels, so we had to mount the gearbox about a foot higher than its ideal mounting spot. now we are having problems with the chain, first we had to mounted upside so we could hang it from the top of the frame and to avoid the chain from grinding against the long (15 tooth?) gear. but the chain is also grinding against the spacers and screws in the corners of the boxes. is it safe to pull them out? what are other things we can do to stop the grinding or ease it so there isnt as much resistance.

thanks!

Based on my understanding of your question and the AndyMark Gearbox construction, the answer is no, those are what hold the transmission together. A possible fix would be adding a sheath of some sort of plastic tube, made out of something like Nylon around the standoff and checking for wear during competition, and replacing as necessary.

[MrForbes]

Look at the transmisson, you'll see that there are some extra holes that can be used to relocate the spacers and bolts to clear the chain. The attatched drawing has circles around possible alternate spacer mounting holes.

[haroony341]

we have teh servo transmissions, and since it is the servo side that the chain is hitting, im not sure if moving the screws is possible.

[MrForbes]

You might be able to get a flathead bolt to replace the original, and countersink the hole in the transmission, to get it to fit. then it should clear the servo easily?

Although I don't know exactly where your chain is running, so it's hard to offer good advice.

How about you use a Paint program to draw your chain location on this drawing, then post the modified drawing. Then we can see exactly what your problem is?

[haroony341]

ill post actual pics as soon as i can.

[haroony341]

thanks for the help, on one side we were able to move it to an existing hole closer to the gears, but the other side had to be drilled. it was a quick fix.

thanks again

[haroony341]

we had some trouble today with our servo shifers. one of them doesnt stroke as far as it should and doesnt shift. the other one still works fine. is it possible to burn one of those out? and where would we look for a new servo?

[Andy Baker]

Originally Posted by squirrel

Look at the transmisson, you'll see that there are some extra holes that can be used to relocate the spacers and bolts to clear the chain. The attatched drawing has circles around possible alternate spacer mounting holes.

Jim is right here, those extra holes are for alternative places to put the spacers in case your chain is wanting to run into them. Also, if you can't find a hole that gets the spacer out of the way, you could drill another set of holes.

As for the mystery white washers that Jeff was referring to in the original post, I will say here what I told him over a PM (or was it an email, I forget)...

Those white spacers are for customers who want their gearboxes tight. Some folks really don't like the side to side play that I prefer on the output shaft. So, they send an email or they call, asking for more of the small nylon washers (one for each gearbox). These can be put onto the output shaft between the sprocket and bearing on the outside (non-motor) wall, making there be absolutely no lateral play in that shaft. Maybe 10% of users want this. To me, it is easier just to throw another washer in with each loose hardware pack to make these folks happy.

Take care all,
Andy