WEEK 15 - molding and casting


INTRODUCTION

In my project I used a arm to squeeze the ambu bag, so I tried to use wood or acrylic but it failed, so now I try to use epoxy

Assignment Description

    group assignment:

  • review the safety data sheets for each of your molding and casting materials,then make and compare test casts with each of them
  • individual assignment:

  • design a mold around the stock and tooling that you'll be using,mill it (rough cut + (at least) three-axis finish cut), and use it to cast parts

components



Molding


I went with this tutorial

  • i used fusion 360
  • open 2d sketch
  • Sketch your own design, for me was na Arm to push my Ambu_bag
  • Then extrude it
  • Now we need to design a block to subtract our design from it
  • Now choose combine, to combine the Arm with the Block
  • we can take a section to ensure that all is good
  • Now choose the split, to make a core and cavity
  • Pins to close and open easily
  • Finally
  • Now go to manufacture
  • choose setup
  • set your stock dimensions and orientation
  • from milling choose 2D, then choose FACE
  • Choose your tool, for me was endmill flat 3mm
  • set your machine speed and feed rate
  • enter your stock hights
  • from 2D choose 2D pocket
  • repeat the previous steps

Alarm :)


  • Good what I did, but unfortunately I don't need it.
  • I don't need core and cavity for this molding and casting method
  • Just I need the postive shape for my part
  • Then, i'll get the negative from silicone
  • finally i'll get the postive from epoxy.

Clacket second time


  • Design the postive phase
  • and just i used 2D pocket strategy, as in the instructions above
  • setup my machinable Wax on Roland milling machine
  • then..my postive arm
  • Casting

    To take safety precautions first

  • Proper ventilation
  • Wear disposable gloves
  • Wear protective clothing
  • Designate items as resin only
  • Wear a respirator
  • For more instructions, please visit this site

  • silicone

  • The Ratio of silicone that I used is: (A)10 silicone : (B)1 hardener


  • Tips:

  • Try to stick to this Ratio, otherwise you will find the silicone is hard before you pour it.
  • Try to calculate the volume of the product first before mixing in an amount of silicone so that you do not waste it.


  • Epoxy

    I used CMB Kemapoxy 150

  • and the Ratio is: 2 epoxy: 1 Hardener
  • It takes approximately 48 hours to harden completely

CAP of POT


Now I need to redo the same previous processes for the Cap of potentiometer

So, Let's start :)

  • I designed the CAP of POT on fusion 360
  • Then, i switched to the CAM process
  • choose setup, then put your stock dimensions and orintation
  • from 2D milling choose Face
  • then set the parameters, I used flat Endmill 3mm
  • well, our product is 3D, so we need to make 3D milling
  • from 3D milling tap, choose 3D Adaptive, then set the parameters, and take care for your Hights
  • for the finishing, I chose 3D Adaptive also, but this time i used Bullnose Endmill 3mm
  • simulation
  • Fabrication
  • Silicone A:B 10:1
  • failure: Unfortunately, I couldn't get the silicone out of the wood
  • So, I made it again with Machinable Wax
  • Casting
  • Epoxy: I used CMB Kemapoxy 150, Ratio 2A:1B
  • Finally

Roland file for Arm here

Roland files for CAP of POT here