Sunday, 29 January 2017

Functional mechanical design

Navindran S/O Chandran/ Navindran Chandran
Diploma in Mechnical Engineering @Singapore Polytechnic
Works as Fablab Assistant @ Fablab @Singapore Polytechinc

Sorry for a quite a log break for my blog as I was busy with my studies and project you guys can follow my project here:

My current project link

I had a chance to take a project in my school where I will be implementing my idea in Indonesia . Please take a look as it may give us a solution in singapore for urban farming to find out more please click on the link above.

I'm writing a post today, to document my experiment that I gonna conduct for my project, I have a lead screw to do an actuator that I'm gonna use it for my project above. I can't find lead nut with mounting and it's quite expensive and will take a long time to get in my hand.

The information about the lead screw:

M8 Lead screw 50cm long

I will be using cubicon as I want it to be fast and reliable. The material filament is ABS

So what I'm gonna do is I'm gonna design a mounting lead nut by putting my nut during the printing it self. That's why I said that this is a experiment to find whether when I add foreign material can I get a rigid structure

This will be the design where the dotted line is my slot for my M8 nut

And I gonna add my M8 screw when my printing  reach here.

You guys may ask why not you print M8 thread using Cubicon . It will a long time to print and the resolution of printer is not good that M8 thread will be not M8. By doing this I think that I may reduce some time. Tommorrow , I will be executing my design and will do a post later.
So for now I think this post will give you the idea


  1. Hi Navin, I did that once for my project and it works!

    You might have to play with the tolerance and the infill. As 3D printed items shrinks during printing, the hole printed might be too loose or too tight sometimes for your nut.

    As for the infill, the last time I did it, I cracked quite a few of my printed parts while I was using it in my prototype[too little infill=too soft and weak, too much infill=too hard and brittle, can't absorb some of the stresses]. Especially since you mentioned you will be using it for an actuater.

    Above are just some of my experiences while making it. Hope it helps and all the best for your project! Do update your results here!

  2. You mean inserting M8 while printing.Wow that's great.Sorry for not informing about infill as i though I could elaborate later in my blog later. Thanks for the comment yo. Plz leave you personal number or email so we can share some idea.