pic: Versa Roller Claw

[smistthegreat]

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

[Anupam Goli]

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

[DampRobot]

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]

@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]

Originally Posted by smistthegreat

@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]

Originally Posted by DampRobot

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]

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]

Originally Posted by Seth Mallory

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]

Originally Posted by Taylor

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]

Originally Posted by Seth Mallory

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]

Originally Posted by smistthegreat

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....