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Unread 12-05-2017, 10:50 AM
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EVO Shifters, why not?

Our team is planning on ordering a few parts before kickoff, and EVO shifters are on the list. After seeing much talk about shifters on CD, I wanted to get your opinion, why should we, or should we not get this product and what would you recommend?

2 or 3 CIMs? (mini CIMs included)
Any tips not to brown out?
What ratio should we use with 6in wheels that optimize controlled speed and push power?

By the way, we are planning on using the 2018 KOP chassis.

Matt
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Unread 12-05-2017, 11:04 AM
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Re: EVO Shifters, why not?

Quote:
Originally Posted by messer5740 View Post
Our team is planning on ordering a few parts before kickoff, and EVO shifters are on the list. After seeing much talk about shifters on CD, I wanted to get your opinion, why should we, or should we not get this product and what would you recommend?

2 or 3 CIMs? (mini CIMs included)
Any tips not to brown out?
What ratio should we use with 6in wheels that optimize controlled speed and push power?

By the way, we are planning on using the 2018 KOP chassis.

Matt
I used to work at AndyMark, and several teams around me used EVO Shifters last year. The only issues I heard about or saw were related to early-production dogs breaking, but that was nipped in the bud in time for events. I'd totally use them if the design called for them.

Given the broad choices available on ratios, I probably wouldn't order them before Kickoff, or at the minimum I'd order them and expect to have to swap ratios out inside. (Murphy's Law applies when trying to read the tea leaves on what the next game will be.)
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Unread 12-05-2017, 11:07 AM
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Re: EVO Shifters, why not?

Quote:
Originally Posted by messer5740 View Post
Our team is planning on ordering a few parts before kickoff, and EVO shifters are on the list. After seeing much talk about shifters on CD, I wanted to get your opinion, why should we, or should we not get this product and what would you recommend?

2 or 3 CIMs? (mini CIMs included)
Any tips not to brown out?
What ratio should we use with 6in wheels that optimize controlled speed and push power?

By the way, we are planning on using the 2018 KOP chassis.

Matt
Word of warning on using 3 MiniCIMs with the EVO (I briefly investigated this).

The EVO uses a 32dp 1st stage with 15T pinions on the motors. Due to the pinion size, they are press-fit pinions, rather than keyed like you would use in the KOP toughbox.

If you're using full size CIMs you can buy them with pinions already pressed on from AndyMark. With MiniCIM's, you would need to press them yourself. The MiniCIMs (and CIMs) don't have exposed back-shafts so you do have some risk to damaging the motor, not sure how much. It takes a pretty hefty press (requires 3-ton press or better). This may or may not be something your team is capable of doing.

Personally, I'd stick with 2 CIMs per side. It's proven, it works well, and it doesn't require software to protect against main breakers popping at reasonable gearings. YMMV
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Unread 12-05-2017, 11:09 AM
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Re: EVO Shifters, why not?

Quote:
Originally Posted by Nuttyman54 View Post
Personally, I'd stick with 2 CIMs per side. It's proven, it works well, and it doesn't require software to protect against main breakers popping at reasonable gearings. YMMV
Lot of wisdom in this post.
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Unread 12-05-2017, 11:43 AM
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Re: EVO Shifters, why not?

We ran them in the 3 CIM configuration with a 22.67:1 low gear and 6.0:1 for high. They worked well, through we would brown out if we accelerated in high gear from full stop and I believe we had some software control. Otherwise they worked well other than the early production errors(replacing breaking both dogs in the middle of competition in a small pit isn't fun...)

I would advocate to use EVOs again if the game called for it. If you use the KoP chassis they do sit pretty low depending on wheel size and a bellypan would be useful if you think its necessary. We built one for the off season and worked ok to keep out field debris out. The ratios we picked worked well for, but AndyMark has a calculator for speed for all ratios and wheel sizes here if you want to check it out!
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Unread 12-05-2017, 12:50 PM
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Re: EVO Shifters, why not?

We are seriously considering using the EVO boxes this year. We are also considering using the WCP shifters, which we have used on four bots in the past, and the Vex ball shifters, which we used successfully in 2014. We have no experience with the AndyMark shifters, and haven't used their boxes on the drivetrain since 2013. A bit of info: we are likely using belt-in-tube, running a 2" wide square tube for the drive rails, as we did last year and on this year's off season bot. My questions:
  • How simple is it to mount the Vex ball shifter WCD style? Any major mods required?
  • Is the extra cost of the EVO worth it to ensure we get boxes quickly? Last year we had to wait until week four to put our boxes together, and nearly had to change our design due to the boxes arriving so late. We would VERY much like to avaoid this problem.
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