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Unread 01-12-2018, 11:39 AM
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Right angle 4:1 gearbox options?

We're looking to save some room on a mechanum drive by rotating the motors 90 degrees to the wheels. AndyMark has this 2:1 right angle gearbox, but we would need something more like 4:1. This could be done by adding a 2:1 spur gear, belts, or something else. It would be easier if there was a similar gearbox with a 4:1 reduction. Any options out there?
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Unread 01-12-2018, 11:54 AM
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Re: Right angle 4:1 gearbox options?

Take a look at what Killer Bee's did a few year ago

http://www.instructables.com/id/90-D...netary-Gearbo/
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Unread 01-12-2018, 11:55 AM
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Re: Right angle 4:1 gearbox options?

In 2015, 1983 Skunk Works did something similar. We used the AndyMark LJ Bevel Box and then did did a chain reduction direct to the wheels. I think we did a 4:1 chain reduction to 6" Mecanums, 16T to 48T that year.

Here's the best picture I could find: https://photos.app.goo.gl/NoSLbktucpLuwNuD2

The only COTS bevel gear sets I know of on the market for FRC (e.g. comes in a 1/2" or 3/8" hex bore or 8mm shaft mounting) is the 2:1 pair that AndyMark sells, the 20T 1:1 sets from AndyMark, or the 15T ones from Vex.

Without a COTS 4:1 bevel set option, if you're not interested in broaching your own bevel gear sets, you're probably best off doing an additional reduction off of the bevel box in gears/belts/chain.
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Unread 01-12-2018, 12:12 PM
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Re: Right angle 4:1 gearbox options?

While it's somewhat of a more expensive option you could use a 4:1 CIM sport into our new 1:1 bevel box with 57 Sport Mounting Kit (am-3840_Sport).
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Last edited by NathanNFM : 01-12-2018 at 12:42 PM.
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Unread 01-12-2018, 02:04 PM
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Re: Right angle 4:1 gearbox options?

Quote:
Originally Posted by GDG 2337 View Post
Take a look at what Killer Bee's did a few year ago

http://www.instructables.com/id/90-D...netary-Gearbo/
That's pretty creative, I like it haha. I'm wondering how well those will hold up over a season on the drivetrain though. Being mechanum it might be okay since they won't see a huge amount of torque (compared to say, high-traction tank drive)
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Unread 01-12-2018, 02:12 PM
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Re: Right angle 4:1 gearbox options?

Quote:
Originally Posted by Nuttyman54 View Post
In 2015, 1983 Skunk Works did something similar. We used the AndyMark LJ Bevel Box and then did did a chain reduction direct to the wheels. I think we did a 4:1 chain reduction to 6" Mecanums, 16T to 48T that year.

Here's the best picture I could find: https://photos.app.goo.gl/NoSLbktucpLuwNuD2
Yeah, that's pretty close to what we're looking at! Keeping the frame open like in the photo.
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Unread 01-12-2018, 02:14 PM
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Re: Right angle 4:1 gearbox options?

Quote:
Originally Posted by NathanNFM View Post
While it's somewhat of a more expensive option you could use a 4:1 CIM sport into our new 1:1 bevel box with 57 Sport Mounting Kit (am-3840_Sport).
Oh boy that is a pricey option...but it looks really nice too. I'll have to consult the students and see what they've come up with.
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Unread 01-12-2018, 02:16 PM
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Re: Right angle 4:1 gearbox options?

Just throwing more ideas out there, has anyone used an angle grinder gearbox in their robot before?

This guy is saying the Harbor Freight 9" grinder is a ~4:1 reduction:
http://www.etotheipiplusone.net/?p=3128
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Unread 01-12-2018, 02:23 PM
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Re: Right angle 4:1 gearbox options?

https://www.armabot.com/collections/...ht-angle-drive

Attach to a VersaPlanetary 4:1, problem solved. Well, other than using a CIM or similar through a VersaPlanetary.
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