05-01-2015 10:44

ouellet348

Re: pic: REV Robotics Simple Lift

I like it. Doing simple things really well > doing a few things inconsistently.

05-01-2015 12:26

StAxis

Re: pic: REV Robotics Simple Lift

This is a really good option for teams without a lot of resources. Being able to help cooperate will be very useful.

05-01-2015 21:19

asid61

Re: pic: REV Robotics Simple Lift

I would recommend lifting the stack and skiding the previous tote underneath it to increase stack height and decrease elevator size.

06-01-2015 09:47

fireXtract

Re: pic: REV Robotics Simple Lift

Could you expand on that? I'm curious where you are saying to slide the previous tote.

06-01-2015 10:04

asid61

Re: pic: REV Robotics Simple Lift

You take the stack you are in possesion of, lift it up, and move into another tote. Then place your stack on top of the new tote, and pick the whole thing up from the bottom again.

06-01-2015 10:09

ouellet348

Re: pic: REV Robotics Simple Lift

To clarify the tote stack lift:

If you lift the bottom tote in an existing stack, so long as your center of gravity is stable enough, you could move a stack of theoretically any height onto a single tote thus reducing the amount of height your elevator would require.

The trade off here is high loads and thus a more stable center of gravity is required.

06-01-2015 15:46

fireXtract

Re: pic: REV Robotics Simple Lift

I agree with that method of lifting totes. What material would be durable yet flexible enough for the snapping side pieces?

06-01-2015 18:27

Amar Shah

Re: pic: REV Robotics Simple Lift

It could be rigid, but hinged and spring loaded so that it can only bend upwards.

06-01-2015 22:47

KaiserEric13

Re: pic: REV Robotics Simple Lift

Just wondering if there is any point advantage to stacking the totes within the robot, or if there is any real advantage to stacking the totes inside the robot in general?

06-01-2015 22:54

JorgeReyes

Re: pic: REV Robotics Simple Lift

Maybe being able to move stacks

06-01-2015 22:55

Doug G

Re: pic: REV Robotics Simple Lift

Stability for one. Keeping your CG closer to your drive base should result in a more stable robot. Less tippy.

Stack security for another. It may be easier to design a system within your robot to keep tote/containers from falling over when moving about.

06-01-2015 23:01

MrRiedemanJACC

Re: pic: REV Robotics Simple Lift

Greg,

Do you know if this was designed with one or the Bimba Cylinders that are available to us? We are mentoring a rookie team and this looks like a great option to get them started! Thanks!

07-01-2015 00:02

asid61

Re: pic: REV Robotics Simple Lift

COG. If your COG gets too far out the chassis (which, for tall stacks, is likely) then you risk tipping a litle bit when you accelerate or stop suddenly. If you tip even a little, you might knock over your totes.

07-01-2015 08:18

aldaeron

Re: pic: REV Robotics Simple Lift

Greg,

Do you have an approximate lead time for the bushings and bearing plate shown in this design to arrive at AndyMark?

Thanks!

07-01-2015 14:10

Greg Needel

Re: pic: REV Robotics Simple Lift

I don't know exactly what Bimba is offering for teams this year. The cylinders in this design are 1 1/6 bore 14 inches long. Technically anything longer than 13 inches should work, you would just be using more air per lift than you need. You could also put stopper blocks (pvc pipe) on the shaft to limit the stroke if only longer ones are available. The ones I used in the design were from Mcmaster http://www.mcmaster.com/#standard-air-cylinders/=vd6415



All parts are in route to AndyMark from Texas, I expect extrusions, plates, bushing and all the parts to be in stock by the weekend at the latest. We will keep doing our best to keep up with demand. We appreciate everyone's patience with this, and if you have any questions I will always be available to help.

How far inside your robot is really a factor of how many totes you want to stack and what amount of control you want to have of the totes as you drive around. If you have them all the way outside your robot, making turns at fast speeds become problematic. The other reason why in this design I only did it half way (besides accommodating the Kit chassis) was to make it so you don't have to drive on the scoring platform when placing totes.

13-01-2015 15:38

Christopher149

Re: pic: REV Robotics Simple Lift

Greg, I know you said it would be in to Andymark by the weekend, but unless I missed it, I doesn't seem to be in yet. Any ETA or updates?

15-01-2015 00:37

Greg Needel

Re: pic: REV Robotics Simple Lift

Extrusion did go in stock for a brief period yesterday but sold out in 6 hours. More is on the way and should be in late next week in a much larger qty. To be sure you get it this time you should click the "email when available" link on AndyMark's Page.

We are committed to getting extrusion to teams as fast as our manufacturer and FedEx can move. The demand for the product has been higher than we expected due to the nature of this year's game. We have arranged a considerable amount of product in the pipeline and think it will meet demand once it lands at AndyMark.

15-01-2015 00:42

Christopher149

Re: pic: REV Robotics Simple Lift

I did see it go back in stock (at a team meeting), but perhaps foolishly waited to see if other REV components would go back in stock only to see it out of stock the next day. I feel for you and the high demand you're trying to meet.

15-01-2015 12:01

earlybird

Re: pic: REV Robotics Simple Lift

Here is a video of a system like that. The pallet stacker lifts the stack of pallets up high enough to put another one underneath.

04-02-2015 21:13

Mark Holschuh

Re: pic: REV Robotics Simple Lift

Greg, my students have been trying to download the assembly file, but the link seems to be broken.

05-02-2015 00:33

dyanoshak

Re: pic: REV Robotics Simple Lift

The Simple Lift step file is hosted on Google Drive due to its size (27 MB). When you click on the link it should bring you to a page that gives you a download button.

Are your students seeing that page?