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

[CNettles11]

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

[Ethan Spitz]

Originally Posted by CNettles11

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

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

[CNettles11]

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.

[Ethan Spitz]

Originally Posted by CNettles11

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.

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.

[CNettles11]

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

[Ethan Spitz]

Originally Posted by CNettles11

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

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

[CNettles11]

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

How about the FP Gearbox?

[Ethan Spitz]

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.

[CNettles11]

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?

[Aren_Hill]

Originally Posted by Ethan Spitz

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.

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

[CNettles11]

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

[Ethan Spitz]

Originally Posted by Aren_Hill

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

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

[Ethan Spitz]

Originally Posted by CNettles11

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?

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.

[Aren_Hill]

Originally Posted by Ethan Spitz

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

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.)

[hillale]

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.