Forum: General Forum
23-11-2016, 16:13
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Replies: 34
Views: 6,419
Re: VEXpro 2017
Did you fix the issue with the pins coming out of the carrier plates? This is a problem on the 7:1, 9:1, and 10:1 stages. We fought this all last season, and even tried epoxy and welding with mixed...
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Forum: Robotics Education and Curriculum
29-06-2016, 09:51
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Replies: 11
Views: 1,794
Re: SkillsUSA vs. FIRST
Thanks for sharing. Skills is great on so many levels. When in school I competed a couple times for precision machining, and it was a great experience.
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Forum: Technical Discussion
24-01-2016, 20:48
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Replies: 28
Views: 3,841
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Forum: Extra Discussion
07-01-2016, 12:33
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Replies: 10
Views: 1,688
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Forum: Robot Showcase
07-01-2016, 09:32
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Replies: 13
Views: 1,808
Re: 4946 Alpha Dogs 2016 Chassis Design Preview
Looks solid! A couple thoughts: It looks like you have a lot of extra space to move the outer wheels further apart. This will improve stability. Also, I'm curious what's inside the big box? Is that a...
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Forum: Extra Discussion
06-01-2016, 21:14
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Replies: 14
Views: 1,733
Well to be honest this gearbox was simply a...
Well to be honest this gearbox was simply a design exercise. I have heard the rule of thumb about gearing low enough to push for 2 minutes without tripping a breaker. But isn't that usually against...
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Forum: Extra Discussion
06-01-2016, 20:51
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Replies: 14
Views: 1,733
I think you could make a fixture with pins to...
I think you could make a fixture with pins to align the pinions and a guide for the broach to ensure the keyways are all clocked the same. Is it worth the effort? Probably not.
I know 971 has run dog...
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Forum: Extra Discussion
06-01-2016, 20:45
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Replies: 14
Views: 1,733
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Forum: Extra Discussion
06-01-2016, 20:42
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Replies: 14
Views: 1,733
I didn't spend a lot of time looking at the...
I didn't spend a lot of time looking at the alternatives, but the selection of ball shifter gears is pretty limited. When I found a combination that worked and gave a 1.82:1 spread, I stuck with it....
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Forum: Extra Discussion
06-01-2016, 16:33
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Replies: 14
Views: 1,733
Re: pic: Single Stage Ballshifter
You make a good point about over constraining things. It's not so much the location of the motors in the gearbox, but the angular alignment of the 11T and 18T gears on all of the motors have to be...
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Forum: Extra Discussion
06-01-2016, 11:53
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Replies: 14
Views: 1,733
pic: Single Stage Ballshifter
[cdm-description=photo]42611[/cdm-description]
This is an idea I had to make a smaller two speed gearbox. The CIMs drive the ball shifting gears directly. The intent is to add a second stage of...
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Forum: Extra Discussion
06-01-2016, 10:37
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Replies: 3
Views: 1,529
Re: pic: 775pro Arm Gearbox
That's a good idea. There are obviously many ways to retain the bearings, and if we actually make this gearbox, I may stick with our usual approach of turning the ends of the shafts down and putting...
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Forum: Extra Discussion
05-01-2016, 16:26
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Replies: 3
Views: 1,529
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Forum: Extra Discussion
03-01-2016, 17:08
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Replies: 7
Views: 1,691
Re: pic: 4587 Wheel and Chain in Tube Drive
Cool design! When our grade11 students showed me their preseason drive train, I envisioned something like this, but they were reluctant to hide the chain, and probably for good reason. Repairs if...
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Forum: Robot Showcase
22-12-2015, 14:51
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Replies: 20
Views: 4,918
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Forum: Extra Discussion
21-12-2015, 16:29
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Replies: 10
Views: 1,758
Yes, that was the drive train I measured the...
Yes, that was the drive train I measured the current on. I expect the current draw to go down once it has been driven a while and things loosen up. The chains are pretty tight because we added 0.018...
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Forum: Extra Discussion
21-12-2015, 14:25
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Replies: 10
Views: 1,758
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Forum: Extra Discussion
14-12-2015, 09:09
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Replies: 2
Views: 1,009
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Forum: General Forum
05-11-2015, 10:16
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Replies: 111
Views: 14,885
Re: New Products for 2016: Speculation, Wants
I didn't really take Thunderhex seriously last year because every time I checked, the bearings were out of stock. I'm not a fan of proprietary sized bearings because they are only available from a...
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Forum: General Forum
04-11-2015, 13:57
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Replies: 111
Views: 14,885
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Forum: Technical Discussion
14-04-2015, 08:58
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Replies: 25
Views: 3,732
Re: Vex Versaplanetary gearbox repair
We had a shaft pop out of a Vex planetary gearbox several times last year. This was mainly because we had rather large rollers cantilevered off the gearbox, and I don't think they are designed to...
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Forum: Extra Discussion
01-04-2015, 09:13
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Replies: 21
Views: 6,303
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Forum: Robot Showcase
29-03-2015, 13:13
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Replies: 14
Views: 6,079
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Forum: Robot Showcase
24-02-2015, 20:28
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Replies: 13
Views: 4,010
Re: Team Dave Presents: Blaine
I'm liking this design a lot. The dual gantry elevator looks like it is very effective. Is there anything mechanical to keep the gantries from crashing into each other or is it all done in code?
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Forum: Extra Discussion
24-02-2015, 11:29
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Replies: 2
Views: 1,397
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The numbers that I gave were purely theoretical and should not be considered realistic - Karibou [more] 
