Mounting Sprockets to the Rover Wheels
 

Hey,

So I was mounting some AndyMark aluminum sprockets to the rover wheels and I noticed that the holes in the wheels are smaller than those in the sprockets. How have other teams been dealing with this? I ended up using machine screws that fit through the wheel mounting holes, but because they're smaller than the holes on the sprocket, it shifts around.

Any suggestions?

Re: Mounting Sprockets to the Rover Wheels
 

we just gave them a little tap with the rubber mallet

8/32 bolts with lock nuts and locktite

Re: Mounting Sprockets to the Rover Wheels
 

Someone in this thread said that locktite dissolved the plastic on the wheels. I would not recommend using lockite in that case. We decided right away that tapping the holes and screwing steel bolts into plastic was not a good idea (even though it was suggested in the intructions for putting the chassis together) so we drilled the holes out bigger and got longer bolts and bolted the sprockets all the way through with some nylon lock nuts on the other side.

Re: Mounting Sprockets to the Rover Wheels
 

locktite does NOT dissolve plastic at all

Re: Mounting Sprockets to the Rover Wheels
 

I haven't seen it happen, but there have been many, many reports that locktited plastic parts break.

I know my team (used to) simply tap the holes of the AM wheels and put the screws in.

Re: Mounting Sprockets to the Rover Wheels
 

from the locktite website

"Threadlockers should only be used on metal-to-metal applications, because the Threadlocker turns into a plastic-like substance."

which is probobly the cause.....

Re: Mounting Sprockets to the Rover Wheels
 

The holes are intentionally small. AndyMark included instructions for tapping and connecting the sprockets to the wheels in the KOP. These instructions are available via a video at the AM website here: http://lib.store.yahoo.net/lib/yhst-.../AM09WNick.mp4

Re: Mounting Sprockets to the Rover Wheels
 

This is somewhat incorrect.

Depending on the type of loctite and the type of plastic it can craze and crack plastics. The general suggestion is to test the loctite product on a small, non critical, portion of the plastic to see if there is a reaction.

And if you don't believe me, try Loctite 496 on a piece of polycarbonate ;)

Re: Mounting Sprockets to the Rover Wheels
 

locktite meaning, threadlocker blue,green and red....

Re: Mounting Sprockets to the Rover Wheels
 

Yes, that sort of thing. Try it first on a non-critical area.

Re: Mounting Sprockets to the Rover Wheels
 

we've always used it, its kinda too late now:D

i doubt it could though,

and not just on the wheels......

Re: Mounting Sprockets to the Rover Wheels
 

Well, I hate to contradict you, but 811 unfortunately knows better. :eek:

Re: Mounting Sprockets to the Rover Wheels
 

i read this, it seems they just poured it in the holes?

if it was the blue threadlocker, then alot of people are in for some troblue:ahh:

and we put our everything together with it:ahh:
maybe thats why it says to use it on only metal to metal applications

i still doubt this though,

Re: Mounting Sprockets to the Rover Wheels
 

Follow the instructions on Andy Marks Website, it explains what size screw to use, and how to tap the holes on the wheels!

Re: Mounting Sprockets to the Rover Wheels
 

We put a 10-32 tap into the old DeWalt cordless and power tapped the holes in the wheel. It seemed to work fine. Then I started worrying about someone over tightening the screws and stripping the threads. We went ahead and drilled clearance holes and put lock nuts on.