Mounting an arm potentiometer

[Manoel]

Originally Posted by lynca

Is there a picture of how surgical tubing and a pot would work ?

This is how we did it last year:

[Tapoore]

We have used vinyl tubing for mounting pots on several different mechanisms. It works very well, however, sometimes we have had problems with the shafts slipping inside the vinyl tubing. To fix this, we have usually drilled a hole through the shaft and through the tubing and pinned it with a cotter pin (a paper clip works just as well...)

[MrForbes]

Here is another method.

[Manoel]

Originally Posted by squirrel

Here is another method.

Dead axle, right? I'm looking at our options for this year (too much torque to use a live axle) and yours seems like a good one. Did you have problems side loading the potentiometer? Is the pot shaft pinned against the aluminum channel or is it a simple interference fit or what?

Thanks!

[MrForbes]

The little arm has a clamp screw, and a slot that you can't see that lets it compress and clamp onto the pot shaft. Very little side load, notice the slot where the nylon screw contacts the little arm. Worked fine all season, and we took it off and used it on a different type of prototype robot this year.

[Dan Richardson]

This is kind of a different way to do it, Its not suggested but it is a quick and easy and "relatively" reliable way to do a arm pot. I've used this method on encoders and pots on arms and drivetrains, all you need is a little wheel a bit of apoxy to mount the wheel to the shaft of the pot and a rounded area of whatever your measuring.

A problem with this method however is you have to constantly adjust your pot, every match you have to set it to make sure it didn't move and recalibrate.

However if you need a creative solution and can't drill into the end of the shaft or create a special coupler this is a solution we've used in the past and does work, and works well within the 2 minute First matches.

http://picasaweb.google.com/DanRRich...04765271712450

[Alex Cormier]

1126 has used the pneumatic tubing with a little heat to attach it to the pot, haven't had any issues with it.

[jagman2882]

Originally Posted by Alex Cormier

1126 has used the pneumatic tubing with a little heat to attach it to the pot, haven't had any issues with it.

no we actually use tiagon tubing (not sure if that is spelled right)

[TD78]

In '05, '07, and this year, we've tapped off the first arm reduction sprocket (as seen here - that picture is from '07). Generally we mount an idler sprocket to help tension the chain, then tap the pot sprocket off of the idler. Keeps things simple. Couldn't find any other pictures, but you can try scanning through Joe's website for any that I may have missed.

[Hazmatt]

It was a pain, but i finally got it mounted with a belt drive. Can someone clarify something for me, though? Do all the pots i use have to be 100k, are other pots against the rules?

[Bochek]

We used a 1k pot, driven via K'nex gears! its really cool and works very well.