H Drive questions

[Ether]

Originally Posted by Ginger Power

Yes this is correct.

OK.

To teams designing H drives: please note the 3.6 fps free speed (3.6*80%=2.9fps estimated top speed). Fine control and high torque.

[Ginger Power]

Originally Posted by Ether

OK.

To teams designing H drives: please note the 3.6 fps free speed (3.6*80%=2.9fps estimated top speed). Fine control and high torque.

Thanks for helping figure this out. I'm sure many teams appreciate it.

[MrRiedemanJACC]

Thanks for this! Our team hasn't gotten this far yet with how we would set it up. We are seriously considering H-Drive, but believe a suspension would be needed for it to be effective tavelling over the scoring platform, but there is a lot of work that will go into that (spring and shock? spring only? what spring force needed, exactly how much travel, etc, etc - do you have any other questions we should be asking ourselves?)
So since are looking at the suspension end of it, we haven't looked at gear ratios. 3.6 seems really slow, but with only one wheel pushing the robot sideways, it makes sense you need to torque to accomplish the task. Even more sense is that you don't need to move quickly sideways, just enough to position where the robot is needed.

[GeeTwo]

Originally Posted by MrRiedemanJACC

We are seriously considering H-Drive, but believe a suspension would be needed for it to be effective tavelling over the scoring platform, but there is a lot of work that will go into that (spring and shock? spring only? what spring force needed, exactly how much travel, etc, etc - do you have any other questions we should be asking ourselves?)

The ideal suspension for a center-wheel of an H-drive would be one that always pushed it against the floor with the same force, presumably 1/5 of the robot weight, though you might come up with a different number. In order to keep an essentially constant force against the floor, you will want to use a setup in which the spring(s) is/are pre-compressed by the desired force, but in which the springs don't actually increase greatly in force as they make the necessary deflection for you to get over the corner of the platform. Disclosure: I've never done and H-drive before, and our H-drive this year is not going to attempt to climb onto the platform.