How can I fix this

VEX IQ General Discussion General Discussion
1

IMG_0077 (1)
IMG_0077 (1)1920×1440 358 KB

How can I fix this without a full rebuild I have a comp on sunday.

2

I would take off all the drive gears, motors, and wheels. Then shove your bot in to a corner to make it square again, then reassemble the rest.

Also I would extend those shafts so you can put bearing flats on the opposite drive channel and support them. If you have time also box bolt your drivetrain braces.

3

could you expand on box bolting?

4

I assume American means using a long screw going across the c-channel at intervals, which is filled with spacers and secured with a nylock on one end, to provide more support for the braces and to stop them bending/distorting upon impact!

5

This is box bolting.

IMG_2034
IMG_20341024×442 33.1 KB

You can use it when you attach the c-channels together to make it less likely to bend.

6

box bolt here

IMG_2035
IMG_20351920×1334 239 KB

7

Take off the stuff in the middle, get a 5 wide cchannel and use shoulder screws and align the drive. https://www.youtube.com/watch?v=yC_6j7vawfk heres a link of a guide to it, this channel also has some other useful drivetrain ideas.

8

IMG_0096
IMG_00961920×2560 498 KB

9

this is the rebuild how is it looking we still have a crossbrace to put on

10

are those long screws on the side without wheels ? Are they 2.5 inches or less long ?

11

they are infact 2.5 inch long screws

12

If you mill a vex v5 high custom strength shaft, you can make a legal screw that is 30 inches long

13

This looks like V5, and you posted in the IQ category. Just a heads up for next time.

14

Uh oh, oh my, sounds like a post GCSE summer break/holiday project waiting to happen!

15

Am I interpreting these pics correctly?

  • All of the axles on your drive base are cantilevered from the inside rail.
  • Drive gears are on .125" axles only supported at the motor (some/all without a bearing flat for the axle).
  • All driven gears are cantilevered screw joints. 2.5" screws for wheels.

I would imagine that the points above will result in a drivetrain with a lot of movement/slop that wastes quite a lot of power once a full-weight robot is sitting on top of it. (One of my newer teams just fixed similar issues with their drivetrain.)

What is the purpose of those two (5/8") screws pointing inward from the outer rail on your in-progress rebuild?

16

Do you mean 24 inches?

More feasibly, you can run an 8-32 die on a .125" shaft and get enough thread (though with flats) to hold a nut.

17

Yes, 24” HS shaft (20 char)