Chief Delphi - Team 3637 Fully Functional Robot with Scissor Lift and Arm

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- - Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics (http://www.chiefdelphi.com/forums/showthread.php?t=91064)

Ethan Spitz

07-02-2011 00:09

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by Aren_Hill (Post 1017370)

Stronger as in more torque required? that's not the gearboxes problem, its yours. Find a way to gear it down further if that's what you need.

(330, 2007 was fp gearboxes through a 2 stage sprocket reduction to move the arm up and down.)

This is true. But same can go for any motor. You can reduce the crap out of any motor. So yes theoretically you could gear them to have the same torque. I have no idea which one is faster at that high of a reduction.

Ethan Spitz

07-02-2011 00:11

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by hillale (Post 1017371)

Hey guys, I love how clean your bot is, but I feel that you'll find out extremely early at your first regional that speed is an absolute necessity. I'd suggest spending the rest of build season looking for ways to speed up the vertical motion of your scissor. Maybe alleviate some of the weight with surgical tubing so that you're controlling the position with the jack screw rather than supporting it's full weight.

I agree, however we were running only at a portion of full speed of the motor and we have some heavy duty springs on order. Thanks!

sdcantrell56

07-02-2011 00:19

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by Ethan Spitz (Post 1017373)

I agree, however we were running only at a portion of full speed of the motor and we have some heavy duty springs on order. Thanks!

The fisher price motor when run through the proper reduction will be much quicker than your window motor. The window motors are decent motors but really in no way comparable to the FP, or even the 550 or 775.

Aren_Hill

07-02-2011 00:21

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Any motor in the KOP is capable of lifting your scissor lift up and down, just the rate at which they can do it changes.

This is the "wattage" spec on each of the motors, the rate at which it can convert electrical energy to mechanical energy.

for rough numbers a denso is around 22 watts
and this years FP is around ~250?

meaning the FP will be able to move your scissor lift approximately 10 times faster for the same given load, or the same speed and 10x the load.

Ethan Spitz

07-02-2011 00:22

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by sdcantrell56 (Post 1017376)

Well I think its too late to switch, and we are slowing down the lift with coding anyway since we don't want to wreck the thing cause its near uncontrollable at full speed.

Quote:

meaning the FP will be able to move your scissor lift approximately 10 times faster for the same given load, or the same speed and 10x the load.

Oh jeese haha, I don't think we want it to move at 10x the speed!

sdcantrell56

07-02-2011 00:26

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by Ethan Spitz (Post 1017378)

Well I think its too late to switch, and we are slowing down the lift with coding anyway since we don't want to wreck the thing cause its near uncontrollable at full speed.

Oh jeese haha, I don't think we want it to move at 10x the speed!

Honestly you might want to think about how fast you want to be able to lift to score. Any time wasted waiting for the lift to reach full height will contribute to less tubes scored. Just as a metric to go by, our team has chosen to have a lift reach full height in under ~1.5 seconds. With sensors well implemented and the programming to control it, it would be very beneficial to scoring quicker

Ethan Spitz

07-02-2011 00:28

Re: Team 3637 Fully Functional Robot with Scissor Lift and Arm - Video and Pics

Quote:

Originally Posted by sdcantrell56 (Post 1017381)

Yes, but if you can get it to the top in transfer from the feeder slot to the pegs (which i think we will be able to do) we won't lose efficiency in that way.

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