Author Topic: Arm Help  (Read 1574 times)

Offline mmtunligit

  • Newcomer
  • Posts: 9
  • Karma: +0/-0
    • View Profile
Arm Help
« on: January 23, 2018, 10:05:11 pm »
Hi, I need an arm that can span a gap of 9 blue rods. It needs to be able to carry two red-yellow balls at a time, and not fall when there's only one ball. the counterweight can only be 3 blue rods long. If anyone has, or can come up with a design, it would be greatly appreciated. Thanks!

Offline Tornado96

  • Advanced Newcomer
  • *
  • Posts: 20
  • Karma: +0/-0
  • I rise with the sun
    • View Profile
Re: Arm Help
« Reply #1 on: January 23, 2018, 10:31:07 pm »
Hey mate. I think we may need a little more info to be able to help you out. Do you have a picture of what it currently looks like?

How far is the arm moving? Is it moving from flat to vertical (90 degrees) or some other interval?

One idea you could look into is having two arms instead of one that take one ball up at a time and they act as counterweights to each other.

But a picture would definitely be most helpful!  :)

Offline mmtunligit

  • Newcomer
  • Posts: 9
  • Karma: +0/-0
    • View Profile
Re: Arm Help
« Reply #2 on: January 23, 2018, 11:30:45 pm »
It's a 90 degree turn, and i can't have one arm down while another one is up because i need to be able to get to the window that you can see in one of the attached pictures

Offline Tornado96

  • Advanced Newcomer
  • *
  • Posts: 20
  • Karma: +0/-0
  • I rise with the sun
    • View Profile
Re: Arm Help
« Reply #3 on: January 24, 2018, 02:55:44 am »
Ah I thought you were talking about a lift originally. Pictures definitely help!.

I'd say just add a bunch of weights to the counterweight you already have. Weights will still have an effect even if closer to the axle. Use wheels, white connectors, spare motors work great.

Another thing you can do is lighten the load on the ball side of the arm. Replace the purple connectors with yellow connectors with a blue rod snapped into them. Slightly lighter.

Another option you have is to rotate the counterweight arm 45 degrees. (i.e. a green connector between the ball arm and the counterweight arm) That way you get 3 yellow rods of length instead of 3 blue rods.

Hope that helps. :)
« Last Edit: January 24, 2018, 02:57:24 am by Tornado96 »