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

what happens when the scissors lock at the bottom-most position? our team is having the locking problem with our scissors.

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

Lock? It doesn't lock at the bottom position. The bottom position does however require the most force to get it to go up. How are you making your scissor work?

Ethan

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

we're using dual screws (like the ones included in the KOP) to pull the back end of our scissors towards the front using the Fisher Price motor. i'll take some pictures tomorrow and upload them. i don't like how the scissors were made on our bot, your team's bot looks lighter than ours.

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

Our scissor is very light. The heaviest part is the bottom linkage because they were flexing when they were lighter. We used one ballscrew that was from the KOP and a window motor since those have 1201 oz-in torque. I don't know what the fischer price motor output is.

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

the fisher price motor was a poor choice for our scissor lift, but our team is scared of window motors, pneumatics, and anything else i have proved we have the capability to make work..

i've been whinking of switching to a larger banesbot motor in out FP gearbox, maybe during the dinner break everyone else takes ;)

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

The banebot motors are crap. They are only there because they want you to buy there expensive gear boxes.

I suggest the window motor or a geared down CIM.

Ethan

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

i'll definitely be talking to the mentors for an executive descision.

How about the FP Gearbox?

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

We decided it was crap as well. Its the gear box they use in those toy trucks that little kids drive around in. Its not made for industrial use or anything.

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

Thanks! i hope the team doesn't mind a motor change! also, our scissor weighs about 30 punds by itself. how much does yours weigh?

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

Tell the 2005 world champs team 330 that those gearboxes are crap.....

Also think about it, haul around a 50-60lb kid vs move your arm up and down

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

we calculated forces around 300 pounds on our scissors when slightly raised.

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

I'm not arguing that they aren't strong, but you need something stronger for a scissor lift I believe.

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

I didn't weigh our scissor w/o the bot, so I don't know. Let me ask if anyone weighed it tomorrow and I'll let you know.

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

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.)

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

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.