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

[Ethan Spitz]

Today we just finished wiring and plumbing everything. Take a look and enjoy!

Pictures: http://www.team3637.com/general/build-2-5-11/

Video: http://www.youtube.com/watch?v=jz9IDrC5jxA

Ethan

[RyanCahoon]

Looking good, team 3637.

As a friendly suggestion, make sure your claw isn't violating rule <R04>, especially the related blue box in the rules:

If the ROBOT includes protrusions that form the “leading edge” of the ROBOT as it drives and are less than 1 sq.in. in surface area, it will invite detailed inspection. For example, forklifts, lifting arms, grapplers. etc. may be carefully inspected for these hazards.
Reasonable efforts must be taken to remove, mitigate, or shield any sharp edges, pinch points, entanglement hazards, projectiles, extreme visual/audio emitters, etc. from the exterior of the ROBOT. All points and corners that would be commonly expected to contact a GAME PIECE should have a minimum radius of 0.125” to avoid becoming a snag/puncture hazard. All edges that would be commonly expected to contact a GAME PIECE should have a minimum radius of 0.030”.

It looks like you guys might be getting close on the minimum radius for the tips of your claws.

--Ryan

[Ethan Spitz]

Looking good, team 3637.

As a friendly suggestion, make sure your claw isn't violating rule <R04>, especially the related blue box in the rules:



It looks like you guys might be getting close on the minimum radius for the tips of your claws.

--Ryan

Thank you for the reminder! I will check that off tomorrow.

Ethan

[GaryVoshol]

Where are your safety glasses? ::safety:: Especially dangerous when you're using your claw to put the tube around a person's head. ::ouch::

Can you floor-load?

[Ethan Spitz]

Where are your safety glasses? ::safety:: Especially dangerous when you're using your claw to put the tube around a person's head. ::ouch::

Can you floor-load?

Ummm not on our heads? :P

We can't floor load. We aren't going to drop the tubes from the feeder anyway, so it shouldn't be an issue.

Ethan

[Ethan Spitz]

.391" is the smallest radius so we are good :)

[Matt704]

I like your team name! :cool:

[MagiChau]

Congratulations on having a working robot about 16 whole days before ship date. Looks like you guys made an awesome, sturdy scissor lift.

[Ethan Spitz]

Congratulations on having a working robot about 16 whole days before ship date. Looks like you guys made an awesome, sturdy scissor lift.

Thanks! Yeah we just have to do minibot now. We have a team working on that now, the problem is going to be where we are putting the deployment mechanism.

It ways about 96 pound right now w/o battery or bumpers.

[MagiChau]

Thanks! Yeah we just have to do minibot now. We have a team working on that now, the problem is going to be where we are putting the deployment mechanism.

It ways about 96 pound right now w/o battery or bumpers.

I think minibots don't count towards the 120 pounds just in case you didn't know alongside with the battery and bumpers.

[Ethan Spitz]

I think minibots don't count towards the 120 pounds just in case you didn't know alongside with the battery and bumpers.

Yep We know, we don't have that completely built yet (I don't think?). We are going to add some more metal almost like a spoiler look since we really don't have anywhere where we can put sponsors logos.

Ethan

[xSAWxBLADEx]

It ways about 96 pound right now w/o battery or bumpers.

o my gosh you guys are my heroes...we are never that light, we are usually 122 pounds lmao (ya those holes arent for looks)

[Ethan Spitz]

Thanks!

We knew we were light when we finished just the scissor part, the holes in the bracket at the bottom are there so we can see into the electronics.

If we have extra room after putting on the minibot deployment system, then we are going to add some bars of metal into it so we can distribute the weight better. We put it on race car scales and the front was 46 pounds and the rear was 50 pounds.

Ethan

[wilsonmw04]

I love the robot, but I have to say the shop dog is awesome!

[Ethan Spitz]

I love the robot, but I have to say the shop dog is awesome!

Thanks!

And yeah we all love Otis, he guards our robot. There is a great shot of him laying on his back in front of the robot in today's post on our website.

Ethan

[CNettles11]

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

[Ethan Spitz]

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]

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]

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]

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]

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]

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]

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.

[Ethan Spitz]

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]

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]

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]

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]

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.

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.

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]

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]

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

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.