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JasperKota wrote: As for axles: I'm currently using a hollow aluminum tube, but I read somewhere that it bends too much (haven't actually tested it yet), so maybe something like brass would work better although heavier. For the braking system, I'm using a steel 1/4 threaded rod and wingnut.

Have you considered using a solid cf rod, instead of a hollow aluminum tube for your non-braking axle?

GoldDigger wrote: Have you considered using a solid cf rod, instead of a hollow aluminum tube for your non-braking axle?

I've never thought about using a cf axle, but I'll look into it! Probably after my upcoming invite early December though, not that much time to order carbon fiber now. Thanks for the suggestion

JasperKota wrote:

GoldDigger wrote: Have you considered using a solid cf rod, instead of a hollow aluminum tube for your non-braking axle?

I've never thought about using a cf axle, but I'll look into it! Probably after my upcoming invite early December though, not that much time to order carbon fiber now. Thanks for the suggestion

My partner and I were considering this at one point for battery buggy. It should work in theory, and I have seen many incredibly strong and experienced competitors (cough cough windu ) use them. We decided not to use them for first few invitationals because our car is already light enough. However for mousetrap, idk the possible advantages

shrewdPanther46 wrote:

JasperKota wrote:

GoldDigger wrote: Have you considered using a solid cf rod, instead of a hollow aluminum tube for your non-braking axle?

I've never thought about using a cf axle, but I'll look into it! Probably after my upcoming invite early December though, not that much time to order carbon fiber now. Thanks for the suggestion

My partner and I were considering this at one point for battery buggy. It should work in theory, and I have seen many incredibly strong and experienced competitors (cough cough windu ) use them. We decided not to use them for first few invitationals because our car is already light enough. However for mousetrap, idk the possible advantages

Yes CF rods for axles are the way to go

I got all my pieces, but I was doing some calculations in hindsight, and I think I might have made some mistakes.
I'm using 3mm threaded rods as axles, but my wheels have a diameter of 4in (101.6 mm), meaning the ideal mechanical advantage of my wheel and axle is 0.0295. (with axle as the effort force, and wheel as the resistance force.) I haven't even factored in the drive arm in this calculation Have I ordered pieces that don't give the system enough torque?

Also, with this system, my wingnut breaking system will only be wound 6.26 mm...

I was thinking of adding some sort of circular bolt around the drive axle to virtually increase the width of the axle, increasing the IMA, but I can't find any solutions to the issue with the wingnut breaking system.

Advice?

PM2017 wrote:I got all my pieces, but I was doing some calculations in hindsight, and I think I might have made some mistakes.
I'm using 3mm threaded rods as axles, but my wheels have a diameter of 4in (101.6 mm), meaning the ideal mechanical advantage of my wheel and axle is 0.0295. (with axle as the effort force, and wheel as the resistance force.) I haven't even factored in the drive arm in this calculation Have I ordered pieces that don't give the system enough torque?

Also, with this system, my wingnut breaking system will only be wound 6.26 mm...

I was thinking of adding some sort of circular bolt around the drive axle to virtually increase the width of the axle, increasing the IMA, but I can't find any solutions to the issue with the wingnut breaking system.

Advice?

I would just buy thicker axles. The tiny increase in weight is well worth the extra accuracy and safety.

Alex-RCHS wrote:

PM2017 wrote:I got all my pieces, but I was doing some calculations in hindsight, and I think I might have made some mistakes.
I'm using 3mm threaded rods as axles, but my wheels have a diameter of 4in (101.6 mm), meaning the ideal mechanical advantage of my wheel and axle is 0.0295. (with axle as the effort force, and wheel as the resistance force.) I haven't even factored in the drive arm in this calculation Have I ordered pieces that don't give the system enough torque?

Also, with this system, my wingnut breaking system will only be wound 6.26 mm...

I was thinking of adding some sort of circular bolt around the drive axle to virtually increase the width of the axle, increasing the IMA, but I can't find any solutions to the issue with the wingnut breaking system.

Advice?

I would just buy thicker axles. The tiny increase in weight is well worth the extra accuracy and safety.

Do you think getting smaller wheels would work as well?

PM2017 wrote:

Alex-RCHS wrote:

PM2017 wrote:I got all my pieces, but I was doing some calculations in hindsight, and I think I might have made some mistakes.
I'm using 3mm threaded rods as axles, but my wheels have a diameter of 4in (101.6 mm), meaning the ideal mechanical advantage of my wheel and axle is 0.0295. (with axle as the effort force, and wheel as the resistance force.) I haven't even factored in the drive arm in this calculation Have I ordered pieces that don't give the system enough torque?

Also, with this system, my wingnut breaking system will only be wound 6.26 mm...

I was thinking of adding some sort of circular bolt around the drive axle to virtually increase the width of the axle, increasing the IMA, but I can't find any solutions to the issue with the wingnut breaking system.

Advice?

I would just buy thicker axles. The tiny increase in weight is well worth the extra accuracy and safety.

Do you think getting smaller wheels would work as well?

Oh yeah, that would probably be easier and lighter.

I don't know if this has been discussed here, but in my school's robotics team, we are currently Andymark's 2in, 35 durometer compliant wheels. Do you guys think that these would work for MS vehicle?

https://www.andymark.com/product-p/am-3462_green.htm

PM2017 wrote:I don't know if this has been discussed here, but in my school's robotics team, we are currently Andymark's 2in, 35 durometer compliant wheels. Do you guys think that these would work for MS vehicle?

https://www.andymark.com/product-p/am-3462_green.htm

Do you have a way to attach them to your axles? If so, then probably, but from what I can tell from the picture they look like they might be a little heavy.