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Unread 07-20-2018, 04:21 AM
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pic: Reverse 2 CIM SS Gearbox Render

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Unread 07-20-2018, 04:21 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Looks nice. How does it attach to the frame?
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Unread 07-20-2018, 08:31 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

The bottom four bolts go through the first wall of the frame 2x1, this render might make more sense for how its mounted. This is my first gearbox so any criticisms or questions are welcome.
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Unread 07-20-2018, 09:44 AM
cad321 cad321 is offline
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Re: pic: Reverse 2 CIM SS Gearbox Render

What ratio are you running and with what size wheels? It looks like 4in wheels from the picture but not totally sure.
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Unread 07-20-2018, 09:49 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

It is a 4.98:1 so about 15 ft/s adjusted with a maxed out weight robot (like my team always builds) with 4 inch wheels. Our 2018 robot had a high gear of about 16 ft/s and it was a bit too fast, so I dropped it down a bit.
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Unread 07-20-2018, 11:28 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

For non-torque transmitting sections of shafts, I highly recommend using snap rings. Shaft collars have a tendency to become loose under high load applications, and snap rings are just pretty easy and painless in general.

Additionally, if you were to flip the bearing flanges towards the inside of the box, the idler shaft could be retained by turning the hex down to 1/2" round and using round bearings.
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Unread 07-20-2018, 12:08 PM
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Re: pic: Reverse 2 CIM SS Gearbox Render

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Originally Posted by BobbyVanNess View Post
For non-torque transmitting sections of shafts, I highly recommend using snap rings. Shaft collars have a tendency to become loose under high load applications, and snap rings are just pretty easy and painless in general.

Additionally, if you were to flip the bearing flanges towards the inside of the box, the idler shaft could be retained by turning the hex down to 1/2" round and using round bearings.
That is great advice, but my team doesn't have a lathe so I was trying to design for our capabilities. That all totally makes sense, thanks for the feedback!
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Unread 07-20-2018, 03:34 PM
mman1506 mman1506 is offline
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Re: pic: Reverse 2 CIM SS Gearbox Render

We made a similar gearbox in 2015 that you might find interesting. We used a belt for the second reduction.
https://www.chiefdelphi.com/media/photos/41334
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Unread 07-20-2018, 06:24 PM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by mman1506 View Post
We made a similar gearbox in 2015 that you might find interesting. We used a belt for the second reduction.
https://www.chiefdelphi.com/media/photos/41334
I considered the belt as the second reduction was nearly 1:1 but couldn't bring myself to put a belt holding the torque of an entire (half) of a drivetrain. I like the idea of mounting the CIMs on the inner plate to bring them inside more and shorten the wheel well. Do you have any more pictures of that gearbox?
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Unread 07-20-2018, 06:35 PM
mman1506 mman1506 is offline
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by Landon K View Post
I considered the belt as the second reduction was nearly 1:1 but couldn't bring myself to put a belt holding the torque of an entire (half) of a drivetrain. I like the idea of mounting the CIMs on the inner plate to bring them inside more and shorten the wheel well. Do you have any more pictures of that gearbox?
I'll grab some later today. We used a 16mm GT2 Belt and it had absolutely 0 issues. Admittedly this was in 2015 but other teams have used similar belts with similar pulley sizes in their drive train without issue in other years (most notably 971)
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Unread 07-20-2018, 08:42 PM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by mman1506 View Post
We used a belt for the second reduction.
If you're planning to use belts before the first wheel, I'd recommend running separate belts from the gearbox to the wheels just fore and aft of it. That way, the loss of one belt doesn't necessarily mean loss of all drive on that side. It also means you won't have to put three belts on an axle.
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Last edited by GeeTwo : 07-20-2018 at 08:46 PM.
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Unread 07-20-2018, 09:02 PM
mman1506 mman1506 is offline
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by GeeTwo View Post
If you're planning to use belts before the first wheel, I'd recommend running separate belts from the gearbox to the wheels just fore and aft of it. That way, the loss of one belt doesn't necessarily mean loss of all drive on that side. It also means you won't have to put three belts on an axle.
I don't think you understand what a second reduction is...

Here's some additional images of the gearbox https://imgur.com/a/d6UYoxo
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Last edited by mman1506 : 07-20-2018 at 09:06 PM.
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Unread 07-21-2018, 05:20 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Thank you everyone for the input! Also, if anyone is looking for a CADathon partner, send me a PM....
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Unread 07-21-2018, 10:07 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by Landon K View Post
The bottom four bolts go through the first wall of the frame 2x1, this render might make more sense for how its mounted. This is my first gearbox so any criticisms or questions are welcome.
Gear box looks great! How do all of the wheels get power? Are you running belts on the outside?
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Unread 07-21-2018, 10:27 AM
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Re: pic: Reverse 2 CIM SS Gearbox Render

Quote:
Originally Posted by pandamonium View Post
Gear box looks great! How do all of the wheels get power? Are you running belts on the outside?
I finished the whole frame last night, the middle belt run is on the inside thanks to the pulley "inside" the gearbox and the other belt runs to the outside wheels are on the outside. The pulleys are 30T and the belt is 15mm wide HTD.
Heres a render of the whole drivetrain...https://imgur.com/a/uXpHsje
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