How to stop K'nex motors 'clicking' under small loads

 by KnexAndMeccanoMan
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Now I'm sure, if you have ever used k'nex, you will be aware of an annoying 'clicking' problem that occurs with K'nex motors. It's really annoying to build a model and find that the motor just clicks and does not operate the model. This instructable will show you a quick and simple way to solve this problem.

Let's first of all start off with why K'nex motors click. The reason is, if you try to put a motor under too much load for it to handle it will stall and eventually burn out. Obviously this is bad, and the designers of k'nex motors wanted to stop this happening. Or, at least make it so that it is apparent when a motor cannot handle a certain load. They did this by adding the 'clicking' feature. K'nex motors are, obviously, designed to be used with K'nex rods, and so they have to fit the rods. When sliding a rod through a motor's shaft, I'm sure you are aware that you have to push it quite hard to get it to go through. This is because there are two lugs of plastic that stick out and grip in the reccesses of the rods. These plastic lugs are the key to the clicking. When the motor cannot handle the load, the rod jumps round a quarter rotation and the lugs grip another part of the rod.

There is a certain load, under which the lugs do this, and this should be just before the motor would stall. The problem occures when these lugs slip too easily. This means that the motor is not performing at it's best and is being held back, in terms of torque, by these lugs.

This easy to follow, simple & easy instructable will show you how to make these lugs much strong and combat the 'clicking' problem.
 
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Step 1: Style of motor

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This instructable is for both the old K'nex motors and the new ones. If you have an old 'classic' motor then please go to step two, and miss out step three. If you have a newer motor then please skip step 2 and go on to step three.
matstermind says: May 5, 2012. 4:55 AM
i see you have the cyber knex, would you happen to have the program CD?
KnexAndMeccanoMan (author) in reply to matstermindMay 5, 2012. 4:02 PM
No, unfortunately that was lost years ago. Perhaps the contents could be found online maybe? Sorry I couldn't be much help.
knexandy says: Oct 25, 2011. 4:22 PM
iv got one of the newer clasic ones all curved and stuff and iv got one of the new ones but the newones moter has burnt out and the clasic one dont grip the knex atall would it be possible to swap the bits from the new to the old to fix the old 1
KnexAndMeccanoMan (author) in reply to knexandyNov 10, 2011. 11:38 PM
It would be possible, yes. I would swap the motor as this is the easiest part to remove and replace. You may not need to solder anything if you use the same wire.
undeadscourge says: Sep 24, 2011. 6:51 PM
Sorry haven't commented on it, but I found them! Yay!
knexandy in reply to undeadscourgeOct 25, 2011. 4:39 PM
glad you found your knex i dont know what id do with out mine
cos t quite abit aswel

1x blue case
1x green case
1x blue box/chest
1x green box/chest
1x storm mountain roller coster
1x cyber knex kit
and alot of smaller kits that i brought when i had the money
undeadscourge says: Aug 14, 2011. 11:46 PM
I lost all my knex in moving :( 3 blue cases...gone...forever...
KnexAndMeccanoMan (author) in reply to undeadscourgeAug 15, 2011. 6:12 AM
Bad luck. I don't know what I would do without mine. Do you know whether it has just been left behind, or is it the removal company's fault?
undeadscourge in reply to KnexAndMeccanoManAug 23, 2011. 10:22 PM
I don't know, I swore that I put them in a box but they weren't there, thanks for giving me the idea to look there, I will soon and fill you in on the details
KnexAndMeccanoMan (author) in reply to undeadscourgeAug 25, 2011. 1:11 PM
Ok, good luck.
super knex builder says: Aug 21, 2011. 6:08 AM
does thos ible include the bkue, green, and black motors? The 1s that are not remote controlled
KnexAndMeccanoMan (author) in reply to super knex builderAug 25, 2011. 1:10 PM
It should do yes, I assume that k'nex used the same design on those. It would be weird if they designed another mechansim for them. I will check soon to make sure though.
oodalumps says: Aug 3, 2011. 12:36 AM
I made a writeup a couple years ago for the trekker motor.

http://knexinnovation.net/showthread.php?501-Click-less-Trekker-motor.
KnexAndMeccanoMan (author) in reply to oodalumpsAug 3, 2011. 9:12 AM
That seems to be quite a good idea. How hard is it to push the rods through?
oodalumps in reply to KnexAndMeccanoManAug 3, 2011. 3:45 PM
Pretty hard. The ring is plastic, so it still bends a bit.
DJ Radio says: Jul 29, 2011. 1:02 PM
All-terrain trekker motor or bust. Although I don't have those myself.
KnexAndMeccanoMan (author) in reply to DJ RadioJul 30, 2011. 1:16 AM
Yeah, I don't have one either, but they are the best. Most expensive unfortunately.
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