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  #151   Spotlight this post!  
Unread 05-19-2018, 06:36 PM
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Re: What COTS parts would you like to see?

COTS flywheel weights would be cool to see. I suspect this could be done with extrusion but some kind of combination of aluminum and steel would be cool too. Something that puts the weight along the edge rather than having to pocket out a weighted mass.
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Unread 05-19-2018, 07:53 PM
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Re: What COTS parts would you like to see?

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Originally Posted by marshall View Post
COTS flywheel weights would be cool to see. I suspect this could be done with extrusion but some kind of combination of aluminum and steel would be cool too. Something that puts the weight along the edge rather than having to pocket out a weighted mass.
Mcmaster sells some ~4” OD iron wheels with a 1/2” round bore. We used em in 2017, not that we shot any balls in-match though. Super convenient to just slide right onto our primary shooter shaft out of the ball path.
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Unread 05-19-2018, 09:01 PM
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Re: What COTS parts would you like to see?

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Originally Posted by marshall View Post
COTS flywheel weights would be cool to see. I suspect this could be done with extrusion but some kind of combination of aluminum and steel would be cool too. Something that puts the weight along the edge rather than having to pocket out a weighted mass.
+1. I'm putting together a flywheel right now, though for some testing, not a robot per se. I'm using some flywheel weights we had machined by NASA back in our rookie year. Each weight pictured has two through holes, and there are mating holes in the weights on the other side with a 1/4-20 thread.
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Unread 05-19-2018, 09:58 PM
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Re: What COTS parts would you like to see?

I think there is a market for cheap(er) shoulder bolts. WCP sells the only one I know of and it has 5/16 inch threads.
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Unread 05-19-2018, 10:12 PM
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Re: What COTS parts would you like to see?

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Originally Posted by samthesnake View Post
I think there is a market for cheap(er) shoulder bolts. WCP sells the only one I know of and it has 5/16 inch threads.
Do you have some specific application in mind? My local Ace Hardware has a few sizes in stock, mostly designed for lawn mowers and such, but in the right scale for certain FRC applications.
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Unread 05-19-2018, 10:16 PM
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Re: What COTS parts would you like to see?

Off the shelf pit road cases, or 148/3310 pit sold on Vex Pro’s website.
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Unread 05-20-2018, 11:39 AM
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Re: What COTS parts would you like to see?

International team can't buy:
*bigger colson wheel
*2" mecnum wheel
*rubber tubing - https://www.mcmaster.com/#5234k85/=183y4sh
*urethane-belts - https://www.mcmaster.com/#urethane-belts/=zrook3
*neoprene wheel - https://www.mcmaster.com/#neoprene-d...llers/=183yvzb
*surgical tubing
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Unread 05-20-2018, 07:27 PM
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Re: What COTS parts would you like to see?

Quote:
Originally Posted by Sagi View Post
International team can't buy:
*bigger colson wheel
*2" mecnum wheel
*rubber tubing - https://www.mcmaster.com/#5234k85/=183y4sh
*urethane-belts - https://www.mcmaster.com/#urethane-belts/=zrook3
*neoprene wheel - https://www.mcmaster.com/#neoprene-d...llers/=183yvzb
*surgical tubing
I'm pretty sure MisCar used 6" colsons on their robot this year. You might want to ask them how they got them (I know we tried to find them without luck).

I'm pretty sure we found a local source for custom belt similar to polycord (urethane belts) in the Haifa bay area. Not sure where exactly you're from but you may be able to find a local factory or distributor.

I'm pretty sure you can get small mecanum wheels from AliExpress, though I've never done it myself. They are pretty expensive though, although I'm not sure how much cheaper it would be even buying them through a US FRC distributor then shipping them.

For all of the other stuff, I agree it would be nice to have an FRC distributor that facilitates shipping it internationally.*


*It would be nice to have an FRC distributor that facilitates easy shipping internationally period, since one still doesn't exist. This year we paid close to a thousand dollars in shipping to order parts straight from the US warehouses, but it still took more than a week to arrive and we had to deal with clearing it through customs. The Israeli distributor for AM, Vex, and REV has a barely usable website, only carries half the products (not the useful ones), never has anything in stock, takes forever to get things shipped from the US, still has to deal with weeks-long customs delays, and doesn't deliver (warehouse pick-up only). If you've ever watched international regionals and wondered why the level of competition is generally closer to what FRC looked like 15 years ago, that's why. The current distribution channels for FRC parts is not set up for shipping internationally, and if FIRST wants to expand significantly overseas that's something they're going to have to deal with. But I'll save my ranting for a different thread.
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Unread 05-20-2018, 08:24 PM
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Re: What COTS parts would you like to see?

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Originally Posted by Cash4587 View Post
Off the shelf pit road cases, or 148/3310 pit sold on Vex Pro’s website.
OH yes, I'd be all over that. We would love to make our pit functional without having to build cases from scratch.
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Unread 05-21-2018, 07:04 AM
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Re: What COTS parts would you like to see?

Quote:
Originally Posted by samthesnake View Post
I think there is a market for cheap(er) shoulder bolts. WCP sells the only one I know of and it has 5/16 inch threads.
Check out Bolt Depot. This is where we got all of our threaded fasteners from this year; minus some of the unique surplus from prior years. Great customer service and pretty reasonable prices.
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Unread 05-21-2018, 07:34 AM
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Re: What COTS parts would you like to see?

A COTS solution for custom scissor lifts. This year the part on our robot that took the most time was designing our 1.5 stage scissor. We had 14 iterations of it and the final version wasn't attached to our ramps until our 6 hour access period. We had different screws, scissor arms, supports. This was only when we decided on the 1.5 stage scissor. We had 4 other lifts before that. We could have had more than 3 days of driver practice and more complex autos if we didn't spend most of our build season on the ramp lift.
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Unread 05-21-2018, 08:25 AM
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Re: What COTS parts would you like to see?

Quote:
Originally Posted by Sagi View Post
International team can't buy:
*bigger colson wheel
*2" mecnum wheel
*rubber tubing - https://www.mcmaster.com/#5234k85/=183y4sh
*urethane-belts - https://www.mcmaster.com/#urethane-belts/=zrook3
*neoprene wheel - https://www.mcmaster.com/#neoprene-d...llers/=183yvzb
*surgical tubing
*Hardware for SRX Mag Encoder(magnet)
*screw for 3 stage VP
*VEX PRO only- option to buy the hardware of any item separately like the spacer of the WCP SS Gearbox or the screw etc...
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Unread 05-21-2018, 08:40 AM
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Quote:
Originally Posted by Sagi View Post
*Hardware for SRX Mag Encoder(magnet)

*screw for 3 stage VP

*VEX PRO only- option to buy the hardware of any item separately like the spacer of the WCP SS Gearbox or the screw etc...


All three of the above would really be helpful.
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Unread 05-21-2018, 08:50 AM
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Re: What COTS parts would you like to see?

Quote:
Originally Posted by Sagi View Post
*Hardware for SRX Mag Encoder(magnet)
*screw for 3 stage VP
*VEX PRO only- option to buy the hardware of any item separately like the spacer of the WCP SS Gearbox or the screw etc...
The magnets are diametrically opposed and can be bought from anywhere but we get them from here. We've also had luck using other diametrically opposed magnets that are both smaller and larger than these:
https://www.kjmagnetics.com/proddetail.asp?prod=D48DIA

There is a CTRE Hardware kit here:
http://www.ctr-electronics.com/senso...dware-kit.html

The 3 stage VPs use 8-32 - 2.75" long bolts (page 13 of the guide):
https://docs.google.com/viewerng/vie...-v2-User-Guide
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Unread 05-24-2018, 01:42 PM
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Re: What COTS parts would you like to see?

550pro per Nick Coussens' suggestion in a swerve drive thread
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