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Replacing COTS gear stages with chain or belt

Nate Laverdure

By: Nate Laverdure
New: 11-26-2018 05:00 PM
Updated: 11-29-2018 04:27 PM
Total downloads: 121 times


A spreadsheet of belt/pulley or chain/sprocket combinations that may be swapped into common COTS gear spacings

Did you know you can use HTD pulleys instead of gears in the VexPro Single Reduction Clamping Gearbox, or in the 3rd stage of a Ball Shifter?


Click to embiggen

Here's a spreadsheet of belt/pulley and chain/sprocket combinations that may be swapped into some common COTS 20DP gear spacings: 72, 78, 84, 90, 96, and 112 teeth.

Open the Google document to see the latest version of this spreadsheet. The attachments below may not be the latest version.

Note: does not consider the 24t #25 spocket, am-3623.

Attached Files

  • pdf Spreadsheet

    TH2363 belt-chain replacement of standard gear spacing.pdf

    downloaddownload file

    uploaded: 11-26-2018 05:00 PM
    filetype: pdf
    filesize: 158.15kb
    downloads: 75


  • PNG Example screenshot

    TH2363 single redux clamping example.PNG

    downloaddownload file

    uploaded: 11-26-2018 05:00 PM
    filetype: PNG
    filesize: 242.95kb
    downloads: 44



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11-28-2018 11:31 PM

marshall


Unread Re: paper: Replacing COTS gear stages with chain or belt

This is really cool info.



11-28-2018 11:44 PM

asid61


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by marshall View Post
This is really cool info.
+1, I've always wondered about this. Great spreadsheet!

EDIT: One note, for the "too small/ too tight" boxes you should make FALSE green instead of TRUE. That way it's more clear what works and what doesn't.



11-29-2018 09:52 AM

Nate Laverdure


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by asid61 View Post
EDIT: One note, for the "too small/ too tight" boxes you should make FALSE green instead of TRUE. That way it's more clear what works and what doesn't.
Good suggestion, thanks. I made TRUEs red instead.

App writers among us:
This exhaustive/exhausting spreadsheet was built by following a pretty short series of simple rules. It could be totally replaced by a program. You should write it.



11-29-2018 10:03 AM

nuclearnerd


Unread Re: paper: Replacing COTS gear stages with chain or belt

Also you might include a check to see if the belts exist commercially. Vex, SDP, AM, mcmaster-carr etc usually only stock a few sizes.



11-29-2018 12:57 PM

Mike Schreiber


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by nuclearnerd View Post
Also you might include a check to see if the belts exist commercially. Vex, SDP, AM, mcmaster-carr etc usually only stock a few sizes.
Strongly recommend belts and pulleys from B & B manufacturing. They have a very good selection and for us parts shipped out of Chicago area and showed up in 2 days.



11-29-2018 04:39 PM

pchild


Unread Re: paper: Replacing COTS gear stages with chain or belt

I implemented my own version of this with some changes; the user now inputs the gear tooth count total to replace, added support for 32 dp gears, 3mm belt and pulley options are reported, and it checks quite a few more combinations.

Here's the current sheet.

Currently it's only checking belts against Vex parts, I'll update it with belts from other vendors when I get a chance.



11-29-2018 04:55 PM

JohnFogarty


Unread Re: paper: Replacing COTS gear stages with chain or belt

I'm confused. There are belt pulleys that press onto a CIM shaft?



11-29-2018 05:02 PM

rlance


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by JohnFogarty View Post
I'm confused. There are belt pulleys that press onto a CIM shaft?
This might be what they plan on using for this



11-29-2018 05:20 PM

AriMB


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by JohnFogarty View Post
I'm confused. There are belt pulleys that press onto a CIM shaft?
It's not what's shown in the picture, but WCP does have a 12t 5mm HTD CIM pulley. (WCP-0076)



11-29-2018 09:20 PM

FrankJ


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by JohnFogarty View Post
I'm confused. There are belt pulleys that press onto a CIM shaft?
Buy plain bore or pulley stock from SPD or B&B and make your own. Key broach and bushing for that size is affordable and can be done with a small arbor press. You can even go to a GT3 profile belt.

Royal supply is a great source for belts.



11-29-2018 11:12 PM

Nate Laverdure


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by JohnFogarty View Post
I'm confused. There are belt pulleys that press onto a CIM shaft?
The Versaplanetary fits the pictured single-redux clamping gearbox. Recall that the VP has a CIM mounting pattern and is available in all sorts of output shaft options.



11-30-2018 11:15 AM

JohnFogarty


Unread Re: paper: Replacing COTS gear stages with chain or belt

Quote:
Originally Posted by Nate Laverdure View Post
The Versaplanetary fits the pictured single-redux clamping gearbox. Recall that the VP has a CIM mounting pattern and is available in all sorts of output shaft options.
Okay, the reductions possible with that make sense. Now I understand.

Add in the benefits of high efficiency, lower backlash, load tolerance, etc of the planetary gear. This is pretty neat.



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