13-12-2013 00:07

Re: pic: Versa Roller Claw

Where was this my rookie year of Logomotion? Awesome design, Brian! I love the usage of the 3.25" versawheels!

13-12-2013 00:27

Anupam Goli

Re: pic: Versa Roller Claw

Are those extra gussets or motor mounts for the versaplanetary gearboxes?

13-12-2013 00:27

DampRobot

Re: pic: Versa Roller Claw

Just curious, do you have a reasonable mass measurement for the claw? Nice work by the way, I really like how those end bearing blocks go together.

13-12-2013 00:29

smistthegreat

Re: pic: Versa Roller Claw

@Anupam, they're "VersaFrame VersaPlanetary Side Mount" from VexPro. Just motor mounts, not gussets.

@DampRobot, no idea about mass. Might play around with this more over the weekend.

13-12-2013 00:38

DampRobot

Re: pic: Versa Roller Claw

If you're new to Solidworks, you can find masses by going to the "Evaluate" tab on the ribbon, then "Mass Properties." If, on the other hand, you're like me, an old hand at Solidworks but too lazy to add in the correct materials, I completely understand .

13-12-2013 01:23

smistthegreat

Re: pic: Versa Roller Claw

I'm not new enough to Solidworks that I don't know how to do that, but I am too lazy to put in the correct materials. I might get around to that tomorrow, but then again I should be studying for finals right now. We'll see.

13-12-2013 08:42

Seth Mallory

Re: pic: Versa Roller Claw

Having the motors being the widest parts make then easy to hit. If you want an easy angle gear box get an Harbor Freight 18V angle drill. You then sub in a first motor of the same size, remove the chuck, and then trim or replace the housing.. We used for a grabber a few years ago when 3 days before shipping we decided that what we had could brake off. What we put on did not look nice but it took one day to make and install and it never failed. It was a great gear box. If you look at team 100's bot of a few years ago they had a very nice looking grabber. It also waved to the crowed.

13-12-2013 08:59

Taylor

Re: pic: Versa Roller Claw

You could also do this.

13-12-2013 09:07

MrBasse

Re: pic: Versa Roller Claw

The only issue with that is that it costs $129, whereas the HF Drill is only $35 when not on sale. And when is anything at Harbor Freight not on sale?

Even with quality issues, you can buy 3 of them and find out just how durable they are for less cost. Although I wouldn't go running a CIM through the HF drill...

13-12-2013 10:40

smistthegreat

Re: pic: Versa Roller Claw

The whole point of this exercise was to examine how easy it is to design a mechanism that used to be custom-only using only COTS parts from VexPro that could be assembled with no more than a drill and a hacksaw. Using the new AndyMark gearbox would be easy to implement, but expensive. Using the Harbor Freight gearbox would be cheaper, but harder to do with only hand tools.

Either way, I don't think my current implementation is particularly bad, especially for how long it took and the fact that it's all COTS. Also, roller claws have definitely been made before, successfully, with exposed motors like this: http://i.imgur.com/PeQIDbJ.jpg

Finally, since I don't plan on actually building this, it's mostly a moot point anyway.

14-12-2013 11:56

AdamHeard

Re: pic: Versa Roller Claw

And the motors are still vulnerable to being broken off....