Author Topic: What part do i need  (Read 3586 times)

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Offline boyardee12Topic starter

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What part do i need
« on: February 10, 2008, 10:51:29 AM »
Well im new at this and i am building a robot for this competition and i need to lift a box that weighs around 5lbs and i was think of making a forklif but i don't know what i need to make it go up

 so like do i need a chain (to make the platform that the item will go on rise up and down) or do i need something like tracks and i need some kind of motor to right?

Offline airman00

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Re: What part do i need
« Reply #1 on: February 10, 2008, 12:11:03 PM »
any website or something?


All you need is a motorized lever , like a seesaw (except motorized)

Forklift requires a rack and pinion gears
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Offline Trumpkin

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Re: What part do i need
« Reply #2 on: February 10, 2008, 12:19:03 PM »
yep you do need a motor don't use a servo unless you wanna spend big $. i would not do a forklift (very complicated). if I were you i would use windshield wiper motors because they have reasonable torque and are cheap. here is a CAD of my arm design
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Offline airman00

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Re: What part do i need
« Reply #3 on: February 10, 2008, 03:48:25 PM »
windshield wiper motors are over kill  ;)

just look for motors with the torque you need , there are PLENTY out there for cheap
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Offline Trumpkin

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Re: What part do i need
« Reply #4 on: February 10, 2008, 07:11:39 PM »
Quote
windshield wiper motors are over kill
5 lb box is pretty hefty. and you can get windshield wiper motors at surplus stores with no shipping costs. although it may be hard to get a big enough battery, you would have to use lead acid batteries.
Robots are awesome!

Offline boyardee12Topic starter

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Re: What part do i need
« Reply #5 on: February 13, 2008, 06:36:21 PM »
so are these  lhttp://www.vexlabs.com/vex-robotics-advanced-gear-kit.shtml  Rack and pinion pack seem right? I cant seem to  find them anywhere else cheaper.

Offline airman00

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Re: What part do i need
« Reply #6 on: February 13, 2008, 06:44:34 PM »
so are these  lhttp://www.vexlabs.com/vex-robotics-advanced-gear-kit.shtml  Rack and pinion pack seem right? I cant seem to  find them anywhere else cheaper.


lego also has

I built a forklift once with my friend's lego mindstorms a year ago

but ed1380 said soemwhere else that forklifts use a piston ( though rack and pinion works as well)
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Offline boyardee12Topic starter

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Re: What part do i need
« Reply #7 on: February 13, 2008, 07:21:57 PM »
o yea does anyone has a diagram or something of how a fork lift works? I already tried google but didn't find none.

Also im not sure if i can get underneath the box to lift it up so i was thinking instead of a platform/forks i could something like a gripper. However the thing is the box im picking up is 30x30x30 cm is also the box the robot has to fit in at the begining. there for i would have to make it contract then expand. Do you guys think that this is overdo?

Offline airman00

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Re: What part do i need
« Reply #8 on: February 13, 2008, 07:55:17 PM »
o yea does anyone has a diagram or something of how a fork lift works? I already tried google but didn't find none.

Also im not sure if i can get underneath the box to lift it up so i was thinking instead of a platform/forks i could something like a gripper. However the thing is the box im picking up is 30x30x30 cm is also the box the robot has to fit in at the begining. there for i would have to make it contract then expand. Do you guys think that this is overdo?

why not have a bar on a fulcrum , kinda like a catapult that goes up slowly. Pick up the box that way
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Offline boyardee12Topic starter

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Re: What part do i need
« Reply #9 on: February 13, 2008, 10:19:04 PM »
can you elaborate on that idea more?

And sorry i forgot to post some details the box doesn't have a top or bottom so it not really a box. Also i need to pick this "box" up and put it over items.

Offline airman00

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Re: What part do i need
« Reply #10 on: February 13, 2008, 10:32:36 PM »


Bottom part slides under box . Motor turns the lever at the fulcrum point( so you don't need a downwards force)
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Offline Admin

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Re: What part do i need
« Reply #11 on: February 17, 2008, 10:51:46 AM »
Quote
o yea does anyone has a diagram or something of how a fork lift works? I already tried google but didn't find none.

you didn't try very hard . . . very first result for 'forklift' says hydraulics . . . ;)
http://images.google.com/images?sourceid=navclient&ie=UTF-8&rls=DGUS,DGUS:2006-11,DGUS:en&q=forklift&um=1&sa=N&tab=wi

why not do a pulley system, and just wrap the string around the motor shaft?

Offline boyardee12Topic starter

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Re: What part do i need
« Reply #12 on: February 17, 2008, 04:09:38 PM »
I can't use hydraulics system but i was asking for a more internal diagram since im a beginner  anyways im actually not in need of of one anymore i got a different design
« Last Edit: February 17, 2008, 04:10:28 PM by boyardee12 »

Offline paulstreats

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Re: What part do i need
« Reply #13 on: February 20, 2008, 06:35:09 PM »
Why not attach a long bolt to a motor/servo output shaft and have a nut slide up and down it when it turns?  if the linear parts are connected to the nut, this will also move up and down.

 


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