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peanut

Drive Chain fully parametric

by peanut Aug 17, 2013
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Hi there,

I am checking the chain.scad file and I noticed that the link hole is missing on the right side of the chain. Can you explain me how I can add it?
Thks

Nevermind,
Solved it.
There is a "mirror function" code line missing in line 310 (inside the function module chain () )

where it is written:

309: translate([0,height/2,-max(link_deep,link_hole_deep)])
310: //right

It should be:

309: translate([0,height/2,-max(link_deep,link_hole_deep)])
310: mirror([0,0,1])
311: //right

This worked for me only for type 2. The lightest version (1) still does not get a hole then.

This fix does the job:
Line 314 - 318:
}else{
cylinder(h=max(link_deep,link_hole_deep),
r2=max(link_diameter_inside/2-(max(link_deep,link_hole_deep)/tan(link_degree)),0),
r1=link_diameter_inside/2);
}

Just swap r1 and r2

Hi,
I have printed 10 single pieces of the chan and and assembled perfectly, then I have print two gear with default parameters, but both the gears have the tooths that there are too long compared the chain :(
regards
Cristian

Update : I have set the gear parameters Lenght 20 instead 21 and clearance to 0,3. It's work well :D

Could these gears go to 4 teeth and larger than you have? I want to try to built an espinner using a 3d printer and your drive chain may work at driving it.

the smallest one i print had 5 teeth and works fine. Just download the two .scad files, opening test_chain.scad , change the "teeth" parameter by your favorite gear and export it as stl file.
Or change more parameters and build your own chain + gears in your favorite size.