Author Topic: Sprockets  (Read 5635 times)

Offline ipman501

  • Advanced Newcomer
  • *
  • Posts: 26
  • Karma: +2/-0
    • View Profile
Sprockets
« on: November 10, 2015, 06:31:05 pm »
So I have some K'nex chain (standard size, I don't really do micro K'nex) and I wanted to get a few sprockets for it so I can make something chain driven. However, in doing research it looks like they only ever made a micro K'nex sprocket (measuring 2 1/4 inch). Do they make standard size sprockets for the standard chain size or am I just out of luck? If there is a standard size, what is the measurement? Thanks!

Offline Sorunome

  • Administrator
  • Sr. Member
  • ***
  • Posts: 367
  • Karma: +6/-0
  • Keep calm and fox on
    • View Profile
    • My Homepage
Re: Sprockets
« Reply #1 on: November 10, 2015, 07:45:25 pm »
While they don't produce any sprockets for classic knex (as far as I am aware) the small blue gears and the medium-sized red ones work fine, I'm just not sure how realiable the axle will turn along, though, but the chain will stay on that gear!
This is a signature.

Offline ipman501

  • Advanced Newcomer
  • *
  • Posts: 26
  • Karma: +2/-0
    • View Profile
Re: Sprockets
« Reply #2 on: November 10, 2015, 10:12:36 pm »
That's good to know. I will try some gear combinations to see what works best. Doesn't make sense that K'nex has standard size chain without standard size sprockets. What were they thinking??  ::)

Offline mathsboy314

  • Full Member
  • *
  • Posts: 125
  • Karma: +2/-0
    • View Profile
    • Youtube - mathsboy314
Re: Sprockets
« Reply #3 on: November 11, 2015, 09:59:53 am »
If you are going to attach pieces to the chain (such as a chain lift for ball machines) then a sprocket will not work, as the sprocket will collide with the added pieces.

If the chain is only used to turn a few distant axles in unison then a sprocket could be used to tighten it.

Offline ipman501

  • Advanced Newcomer
  • *
  • Posts: 26
  • Karma: +2/-0
    • View Profile
Re: Sprockets
« Reply #4 on: November 12, 2015, 05:13:14 pm »
So apparently there ARE full size sprockets??

http://www.ebay.com/itm/KNEX-random-parts-lot-connectors-coaster-black-circle-gear-sprocket-gray-sticks-/301783336666?hash=item4643b046da:g:OhoAAOxy3cJTfkB9

EDIT: So I asked the seller for the measurements and he said it was 2 1/4" across...the same measurement as the sprocket for the mini K'nex...now I'm really confused, lol
EDIT#2: So if you watch this youtube clip (
) at the 52 second mark it clearly shows a regular size sprocket which looks to be about 2 1/4" My conclusion is that the majority (if not all) of the sprockets are actually regular sized. I ordered some chain and a few sprockets off ebay so I can be sure.
« Last Edit: November 12, 2015, 09:47:09 pm by ipman501 »

Offline mathsboy314

  • Full Member
  • *
  • Posts: 125
  • Karma: +2/-0
    • View Profile
    • Youtube - mathsboy314
Re: Sprockets
« Reply #5 on: November 13, 2015, 03:55:58 am »
I think those are also micro sprockets. Their teeth are smaller than a chain's size, so slipping is likely.

The chain in the video is micro. The chain you ordered will only work (reliably) if it's micro.
« Last Edit: June 23, 2016, 12:22:19 pm by mathsboy314 »

Offline ipman501

  • Advanced Newcomer
  • *
  • Posts: 26
  • Karma: +2/-0
    • View Profile
Re: Sprockets
« Reply #6 on: November 13, 2015, 02:56:11 pm »
So I think this is the issue: the sprockets are used with regular size K'nex, but the chain is micro. They make regular size chain that doesn't work with the sprockets. So what was the regular sized chain used for and what models used it?

Offline mathsboy314

  • Full Member
  • *
  • Posts: 125
  • Karma: +2/-0
    • View Profile
    • Youtube - mathsboy314
Re: Sprockets
« Reply #7 on: November 17, 2015, 10:06:22 am »

Offline ipman501

  • Advanced Newcomer
  • *
  • Posts: 26
  • Karma: +2/-0
    • View Profile
Re: Sprockets
« Reply #8 on: November 17, 2015, 02:26:55 pm »
I see. It looks like it is being used with the larger red gears. Thanks!

Offline Sorunome

  • Administrator
  • Sr. Member
  • ***
  • Posts: 367
  • Karma: +6/-0
  • Keep calm and fox on
    • View Profile
    • My Homepage
Re: Sprockets
« Reply #9 on: November 18, 2015, 06:58:11 pm »
Yeah, you take two red gears right next to each other and then the big chain fits right in between :)
This is a signature.

Offline Linkin_J_Knex

  • Sr. Member
  • *
  • Posts: 349
  • Karma: +2/-0
  • Hello! Please visit my Instructables account!
    • View Profile
Re: Sprockets
« Reply #10 on: February 06, 2016, 12:07:00 pm »
I've never heard of full size sprockets but they'd definitely be useful!
Linkin_J_Knex - Weapon of mass creation.