Yoshihiro Asano

FabAcademy2016 from Fablab Kamakura

Molding and Casting


I want to fix strap buckle once broken.


◆Scan by Microscribe


First, I scaned broken one by microscribe, a kind of 3D scanner.
You can prot points on Rhinoceros with pen shape device.

After roughly scaned whole shape, fix and create 3D shape.
I use Rhinoceros commands below.

※ I wrote detailed instruction on Fabble for other lab member.

◆Milling by SRM-20

I used SRM-20 for milling modeling wax with 1/32 inch drill bit.
  1. Open MODELA Player 4.
  2. Import stl file
  3. Select tool shape
  4. Generate tool path
  5. Set the center point on material by V-panel.
  6. Run the tool path
In first try, some parts are so thin and broken.
So I thicken them and create new tool path.

◆Molding and Casting

Let's work with clothes can be dirt.

This time, I use these materials below.


  1. Make outer wall with laser cutted acrylic. Smear barrier coat on milled one.
  2. Measure and pour silicone rubber. Wait for 24 hours,,,, and got a mold!
    Some place were not filled with silicone and has lack.
    I guess measruement was a little incorrect.
  3. Pour cast material, and wait for a while...
    It got be white and have heat!

◆Result

Finally, I got 3 types of buckle, original / 3D printed / casted.
I made them from scanned data, but their shape is little different.
I need to scan more correctly, or change model by each method.
(Ex. For casting, I think need a little bigger model.)

Sadly, casted model has no rigidity, broken.
But I think it's good try and want to use another material or new way!

Mold files is here.

FeedBack

・I can use glass fiber to reinforce.
・Ex. FRP(Fiber Reinforced Plastic) → glass mat
・I can also mix strong / flexible materials.