Hello Vex forumers…
Recently my team and I went on a bit of a drivetrain upgrading spree, and we decided to do the popular trend of screw joints on our wheels. We came up with an idea, but it actually added more friction instead of decreasing it. Some of them also either screwed themselves in tighter or loosened themselves when driving.
Does anyone have any tips/pictures of how to properly do them?
Thanks!
- Henry 344E
Just put free-spinning inserts onto the wheels (the green ones) and then screw the gear onto the wheel. Then you thread the long screw through and mount the wheel. Works great for me!
Use nylock nuts, and don’t tighten them all the way (the figernail rule). Try to make your build thinner (use LS gears).
Also, when using free-spinning inserts, I always shave away a little bit more from rhe sides. It drastically decreased friction.
The main thing is making sure that you only tighten the screw enough so that they have almost no forward/backward play but still spin freely, it is a very fine adjustment. Your situation is likely due to tightening too much, which will cause them to eventually loosen, or tightening due to friction. Just like with drive shafts you wheel should spin completely freely without the motors attached. Also I recommend using a teflon washer in between the screwed and c-channel and unlock and c-channel just so it isn’t metal on metal. Unfortunately don’t have any picture, but the main thing is just fine tuning the tightening of the screws. Also use nylocks, which should prevent the screws from loosening. If you need more help, I might suggest sending us a picture of your drivetrain. Hope this helps!
Thank you for your reply! We have states next week so we chose to just go with normal axles so we can focus on the rest of the bot. After states we’ll experiment with screw joints and whatnot. Thanks again!
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