Where to place motors on RD4B

  1. 4 months ago

    Juster

    Oct 8 Edmonton Alberta

    I been debating for quite a while on which lift to use. A 6 bar or RD4B. I have built a 6 bar and it works. But this year competition a 6 bar is not as effective. So my question is where to place the motors. I can only use 4. Also do need two motors near the gear or not. Thanks in advance

    @Cmills1352 I put 1 on the tower and one at the reversing point on each bar. Doing this instead of putting them both on the tower eliminates some vertical freeplay.

    or, you could put them both on the middle bit, which eliminated 90% of slop
    btw: vertical freeplay is called slop

  2. The_Original_Kev

    Oct 8 Calabasas, CA 1437Z

    you literally only need 2 motors for a double reverse 4 bar this year since the cone is so light. I put them right on top of the top 84 teeth gear in the middle with a lot of elastic tubing

  3. Juster

    Oct 8 Edmonton Alberta

    What on the tower not the gear

  4. Mango

    Oct 8 Northern VA 1575

    First off, don't be so quick to count out the 6 bar as an option. It may not be as effective as a rd4b, but that doesn't mean its a bad choice, especially considering you seem to have trouble building a rd4b. It's never a bad idea to try new things and innovate options that may not be popular, after all, that's how the greatest ideas are formed. But if you would like to go with a rd4b, there are plenty of pictures and videos of them in effect, so you can just use a motor configuration that has worked for others. 4 motors are more than enough, so you've got room to try pretty much whatever you'd like.

  5. Juster

    Oct 9 Edmonton Alberta

    I saw this video and I don’t see any motors near the gear so how does that work?

  6. Ethan W.

    Oct 9 99402D

    So their motors are on the tower. The gears are only to move the top stage of the lift at the same time as the bottom. This is just a different version of a RD4B.

  7. Juster

    Oct 9 Edmonton Alberta

    Ok thanks this makes sense

  8. Juster

    Oct 9 Edmonton Alberta

    Another question what height it should be able to reach

  9. meng

    Oct 9 Singapore 8059

    @Juster ; Another question what height it should be able to reach

    I would suggest that you do your own game analysis and decide how many cones do you need/intent to stack.

    And once you have decided on that, you can start calculating the height of your lift.

  10. Juster

    Oct 9 Edmonton Alberta

    @meng thanks so I'm thinking may be 40-45 in

  11. puzzler7

    Oct 9 Peoria, Arizona 8452A

    @Juster ; @meng thanks so I'm thinking may be 40-45 in

    Why that height?

  12. Juster

    Oct 9 Edmonton Alberta

    Cause I have 45 on a 6 bar. What your suggestion

  13. meng

    Oct 9 Singapore 8059

    @Juster ; Cause I have 45 on a 6 bar. What your suggestion

    but the main point is - how many cones do you intend to stack? and why that specific number of cones? is it because you have done your analysis and think that specific number of cones will help you to win?

  14. puzzler7

    Oct 9 Peoria, Arizona 8452A

    @Juster Cause I have 45 on a 6 bar. What your suggestion

    @meng but the main point is - how many cones do you intend to stack? and why that specific number of cones? is it because you have done your analysis and think that specific number of cones will help you to win?

    This is what I was getting at.

  15. Juster

    Oct 9 Edmonton Alberta

    So how high for around 6 cones

  16. @Juster ; So how high for around 6 cones

    6 cones on a mobile goal is around 26 inches.

  17. Ethan W.

    Oct 9 99402D

    So here's a handy dandy chart for lift heights on certain cone stacks. Have fun

    link text

  18. Juster

    Oct 9 Edmonton Alberta

    So 45 in will be enough for 6 cones on the stationary goals

  19. briancole

    Oct 9 Utah 4270C

    I would start practicing with your six bar and use it your first competition, and then build a DR4B/bowtie and use it as the season goes on.

  20. Juster

    Oct 9 Edmonton Alberta

    Ok that sounds like a good plan

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