Go Back   DIY Go Kart Forum > Building Plans And Advice > Go Kart Discussion

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 01-20-2014, 06:28 AM
gx390's Avatar
gx390 gx390 is offline
Junior Member
 
Join Date: Nov 2013
Posts: 20
Thanks: 26
Thanked 0 Times in 0 Posts
Default DIY Chain Tensioner

Hey guys, it's me again needing some more advice. So my go kart has a #35 chain, but it is too loose. But if I shorten it it gets too tight. I have considered shimming the engine, but I also switch between 72 and 60 tooth sprockets, so this won't work. (72 for bashing and 60 for speed). My next idea it to make a spring tensioner out of a spring, flat steel, and an idler gear, kind of like this picture. Will this prevent the chain from popping off?


Sent from my iPhone using Tapatalk
  #2  
Old 01-20-2014, 06:29 AM
firemanjim's Avatar
firemanjim firemanjim is offline
Just kartin' around....
 
Join Date: Jul 2013
Location: Houston Texas
Posts: 5,191
Thanks: 1,056
Thanked 1,385 Times in 1,097 Posts
Default

Yep......
__________________
(@@)@@(@@)@@-@@@@@@ (@@)@@-@@@@@@-@@@
  #3  
Old 01-20-2014, 06:41 AM
landuse's Avatar
landuse landuse is offline
Moderator
 
Join Date: Nov 2010
Location: Pietermaritzburg, South Africa
Posts: 17,305
Thanks: 2,097
Thanked 3,438 Times in 2,803 Posts
Default

That is a slick tensioner. If you do something like that you will be fine
  #4  
Old 01-20-2014, 07:46 AM
Poboy kartman Poboy kartman is offline
Banned
 
Join Date: Jul 2013
Location: White Settlement Texas
Posts: 12,463
Thanks: 3,769
Thanked 2,954 Times in 2,300 Posts
Default

Since you didn't fill out your profile I don't know if there is one around you but. ......Tractor Supply should have an off-set link that may solve the problem. It basically eliminates 1/2 of a link.
  #5  
Old 01-20-2014, 08:11 AM
anderkart's Avatar
anderkart anderkart is offline
Moderator
 
Join Date: Apr 2009
Location: Surprise Arizona USA
Posts: 6,103
Thanks: 496
Thanked 1,159 Times in 960 Posts
Default

This pic gives a better reference of where a chain tensioner should be located.

The Following 2 Users Say Thank You to anderkart For This Useful Post:
gx390 (01-20-2014), machinist@large (01-20-2014)
  #6  
Old 01-20-2014, 12:52 PM
buckwheat buckwheat is offline
Member
 
Join Date: Dec 2012
Location: Lilburn, GA
Posts: 70
Thanks: 0
Thanked 14 Times in 10 Posts
Default

The overhung load on that bolt looks excessive. I would heat & bend a dogleg in the flatbar arm piece to reduce the overhung load. What kind of bearing is in the idler sprocket?
The Following User Says Thank You to buckwheat For This Useful Post:
gx390 (01-22-2014)
  #7  
Old 01-20-2014, 05:20 PM
gx390's Avatar
gx390 gx390 is offline
Junior Member
 
Join Date: Nov 2013
Posts: 20
Thanks: 26
Thanked 0 Times in 0 Posts
Default

Buckwheat, which picture are you talking about?


Sent from my iPhone using Tapatalk
  #8  
Old 01-20-2014, 07:00 PM
OzFab's Avatar
OzFab OzFab is offline
Senior Member
 
Join Date: Nov 2011
Location: Warwick Qld, Australia
Posts: 15,619
Thanks: 1,135
Thanked 3,399 Times in 2,676 Posts
Default

The pic you posted; a tensioner mech should be as close to the line of the chain as possible; the farther away from the chain, the longer the bolts you need & bolts tend to bend under load
__________________
2013 Build-off Winner - http://www.diygokarts.com/vb/showthread.php?t=21076
The Following 3 Users Say Thank You to OzFab For This Useful Post:
Bmr4Karts (07-07-2019), gx390 (01-22-2014), machinist@large (01-20-2014)
  #9  
Old 01-21-2014, 06:45 PM
buckwheat buckwheat is offline
Member
 
Join Date: Dec 2012
Location: Lilburn, GA
Posts: 70
Thanks: 0
Thanked 14 Times in 10 Posts
Default

Fabroman has said what I was thinking. The bolt needs to be shortened to reduce the over hung load. This will require moving the mounting bracket or re-engineering the arm and its pivot point. You might have to go to a larger sprocket so you can incorporate a ball bearing or at least a bronze oilite bushing.
The Following 2 Users Say Thank You to buckwheat For This Useful Post:
gx390 (01-22-2014), machinist@large (01-21-2014)
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:55 PM.