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BirdPerson

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Reply with quote  #1 
Inter-American University of Puerto Rico here.

There are two types of gripper wrist plates. One is thick and textured while the other one is made of the same material as the top and bottom plates. The thicker one's holes are too far apart, the C bracket only works with the wrist plate similar to the top and bottom plate. It's much thinner than the regular one we usually see in the pictures. This wrist plate's holes are not wide enough to fit the 6-32 screws. Why do we have two wrist plates? Should we modify the thick wrist plate in order for it to fit with the c bracket? I believe the screws don't fit anywhere currently.

The one on the right is the one that fits with the C bracket

WIN_20171024_16_44_47_Pro.jpg 


Carter

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Reply with quote  #2 
Cabrillo College has been using the one on the right. 

Take a look at the Assembly Manual, maybe that will help. 
https://github.com/BCLab-UNM/Swarmathon-Robot/blob/master/AssemblyManual/Assembly5-GripperAssembly.md

2017-07-20 15.56.19 (copy).jpg


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Cabrillo College, Aptos CA
BirdPerson

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Reply with quote  #3 
Thank you for the reply. We got to this point by reading the assembly manual. As you can see below this gripper wrist plate is different from the one in the manual and the one in your picture, Carter. The holes that go with the C bracket are just a bit too far apart.

P_20171025_102528_vHDR_Auto.jpg 

We also have 3 sets of laser cut wrist plates. The 6-32 screws are too thick for this one, which makes installing the fingers impossible. Those screws are also too thick for the holes the maual shows us on the non-laser cut wrist plate.

P_20171025_102617_vHDR_Auto.jpg  
(Laser cut are on the left this time)


Nocare

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Reply with quote  #4 
Hi bird, the laser cut is the one you are supposed to use. The larger wrist plate is part of a kit we are partially utilizing for our design and thus are discardable extras. Use the smaller wrist plate the lab designed.  The screws are all supposed to be tight as they need to tap there own holes since non of the holes are threaded.
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jjakenichol

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Reply with quote  #5 
Hi everyone,

This one's confusing so hang tight!  As it turns out neither of the wrist plates in the first picture should be used.  The wrist plate in Carter's (Cabrillo College) picture is indeed the correct wrist plate.

We have four new teams in the physical competition and they were sent incorrect parts.  I contacted their faculty advisors last week about the correct parts being sent out.  I sent those parts on Monday and I will email them with tracking numbers soon.

P_20171025_102617_vHDR_Auto.jpg

All of the parts in the above image can discarded.  Both sets happen to be laser-cut.  The set on the left is the correct 2-dimensional design but it's 3mm acrylic (too small, too brittle for the screws) and was mistakenly sent out to the new teams.  The set on the right is 6mm ABS plastic and is not the correct design for the swarmies.  We send those out because you need the included screws and servo horns.

The correct parts will have the 2-dimensional design seen on the left, but will be 6mm ABS like the set on the right.

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BirdPerson

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Reply with quote  #6 
Thank you! 

As a matter of fact we recieved the new parts a few minutes before this answer was posted. It all makes sense now.

Sorry if there was any confusion. Communications are a bit difficult at the moment.

Again, thanks!
jjakenichol

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Reply with quote  #7 
Quote:
Originally Posted by BirdPerson
Thank you! 

As a matter of fact we recieved the new parts a few minutes before this answer was posted. It all makes sense now.

Sorry if there was any confusion. Communications are a bit difficult at the moment.

Again, thanks!


I'm glad it's all been cleared up. 

It's also great to see you're still hard at work on the Swarmathon over there in Puerto Rico!

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Jake Nichol
Swarming Technologies LLC - Swarmathon Hardware Support
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Nocare

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Reply with quote  #8 
Sorry for the confusion, Jake is of course always right my bad.
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