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Unread 01-13-2018, 05:30 PM
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Exclamation Linear Actuator

Is there any way to build a linear actuator or is there a cost effective and legal actuator that we could use.
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Best way to cut a CIM shaft?
I quite enjoyed running the CIM at full speed with a hacksaw up against it, but something tells me you are looking for a slightly safer option.
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Unread 01-13-2018, 05:40 PM
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Re: Linear Actuator

I'm guessing by saying "Cost effective" you have already seen the DART kits.

People have posted some custom linear actuators on CD-Media, including the LIN-101 and a derivative.

In general, linear actuators aren't cheap because nice leadscrews are expensive. Although-
Quote:
Select Automotive Motors (Window, Door, Windshield wiper, Seat, Throttle)
are legal. Find an automotive linear actuator that is provably marketed as one of these, and you should be good.
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Unread 01-13-2018, 07:07 PM
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Re: Linear Actuator

We have also done "lead screws" using threaded rod and coupling nuts, and may do so again this year.

Conveniently, 5/16" coupling nuts are 1/2" on the hex outside making them easy to couple to a number of common FRC components. If you drive this rod with a CIM with no reduction at 75% of free speed and keep the nut from rotating, the nut will move ~3.7" per second. A 775 pro or red line is about 13 ips at 75% of free speed.
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Unread 01-14-2018, 10:01 PM
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Re: Linear Actuator

We had good results using these devices retrofitted with BAG motors in 2016:

https://www.princessauto.com/en/deta...or/A-p8489098e
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Unread 01-14-2018, 10:43 PM
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Re: Linear Actuator

Quote:
Originally Posted by nickbrickmaster View Post
I'm guessing by saying "Cost effective" you have already seen the DART kits.

People have posted some custom linear actuators on CD-Media, including the LIN-101 and a derivative.

In general, linear actuators aren't cheap because nice leadscrews are expensive. Although-
are legal. Find an automotive linear actuator that is provably marketed as one of these, and you should be good.
I would not recommend LIN-101 due to the sheer amount of tuning required to make it work. I was working on a new one in the pre-season but never got it finished. The DART can be ok but it has mechanical issues that make me shy away from using them. If you can, try and make your own or find something else.
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Unread 01-14-2018, 11:32 PM
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Re: Linear Actuator

If you could maybe provide some of the requirements, such as travel length, and how much force it needs to exert...?????
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