Hello, everyone. I want to make my chain bar/mogo bot faster for the state competition (March 3), and I’m having issues:
I used to use a 1:2 drive ratio with torque motors. At my first tournament, it failed miserably and I was useless during my matches. (I use chains, yes)
I have a 1:1 torque drive now, and it works fine, but I think it’s too slow
When I tested another speed chain gear ratio (with smaller gears; 36t to 12t output) recently, it failed again! Front right motor stalled, and others soon followed.
The drive is rather tightly packed in, but I don’t think I have too much friction. I can send pictures later today.
I’ve heard other teams say that they use similar speed ratios and work fine and fast with heavier robots. I want to say it weighs between 15 and 19 lbs, but I don’t have an official weight. I am considering and probably will do a turbo conversion for all the drive motors. Do any of you have suggestions for improving the overall drive speed besides that? I would like to be as much of a multi-purpose defensive mogo/offensive short stacker as I can; 4 cone max.
So this is general help. 1)If you are cantilevering wheels, dont put two pieces of metal. 2) Make sure that the axles have a bearing on 2 points and that they aren’t bent. If they are bent, try to make the space between the two sides smaller.3) Make sure the bearings are fully seated in the metal, there are little prongs on the back that go into the holes. 4) Make sure your motors are tight. 5) try to get your wheels to free spin, I like to have them free spin for ~10 seconds.
15-19 pounds should not burn out 4 motor torque. 4 motor high speed could take that so it is either a motor issue, make sure you have the right gearings internally, and make sure all the fricition you can is removed. Hope this helps, and if you can post picture and weigh it.
Ok, so my ** official weight is 14 lbs **. I use bearings on every shaft, yes, and I’m working on getting rid of some chain-on-wheel friction in the front. Here’s a couple pictures:
If you run your mobile goal on one motor, you will be able to use a 6 motor speed drive. In terms of a DR4B, a two motor 1:7 torque DR4B works without browning out and is plenty fast. Also, 15-19 lbs should not brown out 4 torque motors. Our robot weighs about the same (roughly 12lbs) and we use a 4 motor speed drive and it has never browned out (with the exception of someone pinning us for 10 seconds straight). But, since you’re only intending on stacking 4 cones on a mobile goal, your best bet would be to only use a two motor lift and use the remaining motors on your drive, allowing for a 6 motor speed drive
I have an internal stacker and I’m currently using a four motor high speed drive (direct drive) and it works just fine. I have no stalling issues and it’s been taking some brutal driving yet performs great.
