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-   -   pic: Versa Roller Claw (http://www.chiefdelphi.com/forums/showthread.php?t=123077)

smistthegreat 13-12-2013 00:06
pic: Versa Roller Claw
 

Andrew Lawrence 13-12-2013 00:07
Re: pic: Versa Roller Claw
 
Where was this my rookie year of Logomotion? :rolleyes: Awesome design, Brian! I love the usage of the 3.25" versawheels!

Anupam Goli 13-12-2013 00:27
Re: pic: Versa Roller Claw
 
Are those extra gussets or motor mounts for the versaplanetary gearboxes?

DampRobot 13-12-2013 00:27
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.

smistthegreat 13-12-2013 00:29
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.

DampRobot 13-12-2013 00:38
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by smistthegreat (Post 1311576)
@DampRobot, no idea about mass. Might play around with this more over the weekend.
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 :) .

smistthegreat 13-12-2013 01:23
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by DampRobot (Post 1311577)
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 :) .
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.

Seth Mallory 13-12-2013 08:42
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.:)

Taylor 13-12-2013 08:59
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by Seth Mallory (Post 1311672)
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
You could also do this.

MrBasse 13-12-2013 09:07
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by Taylor (Post 1311679)
You could also do this.
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...

smistthegreat 13-12-2013 10:40
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by Seth Mallory (Post 1311672)
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.:)
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.

AdamHeard 14-12-2013 11:56
Re: pic: Versa Roller Claw
 
Quote:
Originally Posted by smistthegreat (Post 1311705)
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.
And the motors are still vulnerable to being broken off....


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