I need help trying to connect chain links (in LDD) around a set of idlers and drive wheels. This is to be used on a tank design, and therefore is not using actual chain. It is using "Chain Link m=1" connectors, as well as there being 2 drive wheels to mount on. I have tried many different ways, but none of them worked.

Here's a picture of the tank and its threads

The White Circular pieces are meant to act as wheel idlers, whilst the gears are actual wheel idlers

  • Can you explain what hasn't worked?
    – Craig
    Oct 11, 2016 at 10:28
  • I tried extending the cross axle far enough so that I could add a technic piece. This piece was said to have the piece needed to join the links together. But that didnt work. I dont know the exact name of the piece though.
    – GipsyD
    Oct 11, 2016 at 10:29
  • Are you talking about a real physical model that doesn't fit, or are you asking how to select the piece you want in a 3D modeling application? If it's the former a photo or two would help.
    – Craig
    Oct 11, 2016 at 10:33
  • Im trying to connect them in LDD
    – GipsyD
    Oct 11, 2016 at 10:37
  • LDD does have some problem in making tracks that fit onto a bogey set. I think there may be some videos out there that might deal with this issue. Oct 11, 2016 at 12:52

1 Answer 1


This issue is one of LDD's most prominent shortcomings. Unlike other CAD software, the simplifications that LDD makes in exchange for ease-of-use restrict some creations from being assembled with any degree of ease. However, the treads in this model are possible to apply, although I cannot say how easy it would be to get them the way you would want.

A quick search from more experienced LDDers on YouTube turns up that the process is very redundant and tedious. Each link must be adjusted individually, and when needed, certain gears must be turned to accept the chain. However, getting the initial link on the system requires a crafty Technic device used to mount a five-hole tread to a bar suspended just above the gear in question. From this five-hole link, the smaller links can be added, as shown in this video.

I tried the process myself and while it is painfully difficult, the end result is achievable. Here is a photo with the Technic system in place, and another after I removed it and added the correct link.enter image description here enter image description here

Of course, I had to try this in real life where dexterity is on my side. I ran up the exact construction as I see it in your provided picture and have determined that the perimeter of this design falls just over an even multiple of links. Twenty-five links are just barely too short to connect at the ends, and twenty six is much too baggy to stay seated on the gear teeth.

For another example of adding treads in LDD, you may also want to see this time-lapse video. Hope this helps and happy building.

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