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  #16   Spotlight this post!  
Unread 11-08-2018, 08:34 PM
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Re: 33 The Killer Bees - 2018 Swerve Module

Aint nothing like having the real thing!
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Unread 11-09-2018, 05:41 AM
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Re: 33 The Killer Bees - 2018 Swerve Module

Thanks for posting this, very helpfull.

I have one question: Is it for a reason that you decided to go for a 2RS bearing seal (on your 6816) instead of a more common seal like zz?
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Unread 11-09-2018, 01:18 PM
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Re: 33 The Killer Bees - 2018 Swerve Module

Quote:
Originally Posted by Noudvanbrunscho View Post
I have one question: Is it for a reason that you decided to go for a 2RS bearing seal (on your 6816) instead of a more common seal like zz?
For something in this environment, I imagine the rubber reals of the RS bearings help keep out carpet and other field gunk a bit better, and metal zz seals are easier to damage depending on how they're used. Additionally, most rs seals can be removed to inspect the races/balls/etc and reused without issue where the zz seals often damaged by removal, and slight bends prevent them from fitting back into place correctly.
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Unread 11-10-2018, 01:16 AM
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Re: 33 The Killer Bees - 2018 Swerve Module

Quote:
Originally Posted by Mike Schreiber View Post
How did the wear on the 32dp gears look at the end of the season - especially the ones with 2 motors on them?
Nothing very noticeable on the 32Dp gears, even the modules with 2 drive motors. The motors are spaced equidistant around the 100T gear, so there is no uneven load on the gear. We ran the 7075 aluminum version of the 32DP 100T gears from VEX.

Quote:
Originally Posted by Cog
What advice do you guys have for using 3D printed nylon in FRC?

My team is currently experimenting with using our MakerGear M3s to print Taulman Nylon 645.
We got all our printed parts from shapeways.com last year. It was more expensive then if you had a printer and ran everything yourself, but honestly the part quality we got from Shapeways was great, and we knew when we would receive the parts (It was 6 days total from the time we ordered them, which for the drive was fine since we ordered early and were able to plan around knowing the delivery schedule). These parts are Nylon SLS parts; I do not know the exact printer Shapeways uses, but it is definitely a higher end industrial level one.

We have ordered a Markforged Onyx One this offseason and will be likely be printing parts with this in the future. If we feel we need more bandwidth or something though I would happily use Shapeways again. #TeamMarkforged

Quote:
Originally Posted by Connor McBride
What is the weight (as pictured)? I noticed that the picture shows 1 775 driving but the CAD shows 2. Can you drive it fine with just 1?
We ran a single 775Pro drive motor on our front two modules, and 2x 775Pro drive motors on our back two modules.

In CAD, the weight of the 2x drive motor version with the talons is around 7.25lbs.

I do not know the final actual weight of the 2 drive motor version with the talons, however I can say that the single drive motor version without the motor controllers mounted weighed in at 4.9lbs.

The version of that module in CAD in the past estimated about a quarter to half pound heavier, still haven't totally nailed down where in the model the extra weight is coming from compared to real life. Part of this is likely the printed parts; in CAD they are a completely solid body of Nylon, but in reality because they are SLS parts, while they are 100% fill by nature they are not as dense as what the parts estimate as in SolidWorks.

Quote:
Originally Posted by s-neff
Why was that a requirement?
We wanted to bolt into either end of the wheel shaft as a way to make sure the wheel forks could not flex outward at all. If the shaft was a dead axle, then it would act as a great way to tie the two forks together rigidly. With the live axle we cannot do this, so bolting into the shaft was the next best option. Hard to say how crucial this was; I think the module ended up being pretty solid with how the forks mounted to the housing above anyway, but better to be safe on such a critical part of the robot.

Quote:
Originally Posted by waialua359
Aint nothing like having the real thing!
We hope you and 359 are enjoying the module we auctioned off at the IRI silent auction! We were glad it raised as much money as it did for the IRI charities.

Quote:
Originally Posted by troy_dietz
Quote:
Originally Posted by Noudvanbrunscho
I have one question: Is it for a reason that you decided to go for a 2RS bearing seal (on your 6816) instead of a more common seal like zz?
For something in this environment, I imagine the rubber reals of the RS bearings help keep out carpet and other field gunk a bit better, and metal zz seals are easier to damage depending on how they're used. Additionally, most rs seals can be removed to inspect the races/balls/etc and reused without issue where the zz seals often damaged by removal, and slight bends prevent them from fitting back into place correctly.
Troy is generally correct on this. That said, I wouldn't say we went out of our way to pick this specific seal type for the bearing over another. It was really the bearing that was available that we found at the time that fit the dimensions we needed. That said, if we had looked into options for other types of seals, we likely still would have used the ones we had.
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