Our team needs your help with our Hab3 lift mechanism. We are a rookie team and I’m the main mentor, but my expertise is software, not mechanical. Our competition is 3/21, so we have about a week left to get this working on our practice robot if we can.
The issue we have at the moment is the #25 chain is slipping. From reading on CD, we think the advice you’re going to give is to upgrade that to #35 chain and looking at sprocket availability and sizes, that will also change our gear ratio. The reason we went with #25 is that we had it on hand already, so it was easier on the budget.
I could see that we need a better way to keep the chain tight. It’s loose in the pictures because our tensioning mechanism is failing, the motor/gearbox mount is sliding on the rails. Any advice on how to improve this is appreciated.
What other issues do you see with our design? We are running the CIM motor at 50% currently. The first gearbox is a 12:1 Versaplanatary which in turn drives a 48:1 CIM Sport. The drive sprocket is 24 tooth and driven is 48 tooth, although with #35 chain I think that will change to 15 and 36 tooth. We’re expecting total weight (with battery and bumpers) of the robot to be just shy of 100lbs.
I’m advising them to upgrade the center driven leg from one to two 1x1’s to give it more strength. The plywood base will be replaced by something more light weight.
Another question, if when sitting on Hab3, if the legs are touching the corner between the horizontal platform and vertical wall, is that counted as a successful climb? If not, we need to adjust a little because backing up even the slightest bit too far and our rear wheels come off the platform and we are then supported by Hab1.