spinner bar ratio

[maddox10]

20mm axle. Prefable very good steel, like chromalloy, or even Titanium.

[Danjr1]

What's the opinion on slipper clutches in spinners?

[maddox10]

What's the opinion on slipper clutches in spinners?

A neccesity. Now to source one strong enough to do the job in the size and weight we want to devote to it.

[Danjr1]

Hmmmm well in it's most simple form, a piece of rubber can be bonded to the pulley which runs against the bar, allowing it to slip when it hits something. The bolt which is the axle can then be loosened/tightened for correct pressure

[maddox10]

Burning rubber indeed.

I hope you calculate in the spares and ease of maintenance.

[typhoon_driver]

Slipper clutch? Never bothered. If you want to allow slippage then use a V or O belt. Such a large bar is only going to have issues being stopped if it hits something solid like the side of the arena and even then I think it would have a hard time stopping it.

If you want a comparison for what you are building then watching videos of NST

[mattsdragons]

This should be made a sticky, I've learned more about spinners lookin here than anywere else

[Danjr1]

I'm thinking now that id pin the bar to the pulleys via 4 7.5mm by 75mm metal pins, although I'm not sure whether that would be strong enough, meaning the slipper clutch idea seems more appealing.

The only events I can run something like this at is the robo challenge events correct?

[typhoon_driver]

such a thick bar will always be an issue to drill and machine. Speak to those such as kenny and see how much it would be to machine the holes for you. ALWAYS do it properly with a spinner first time.

Yes it can only be run at robochallenge events

[Danjr1]

Hmmmm in that case, I'll have to give it some serious thought. I did a very simple costing list and it came up at £400 so it's a lot of money for something that can only be used 2 or 3 times a year (although I could always remove the belt and run it at other non-spinner events). I'll prob complete the design anyway