WEEK 7 Molding and Casting

This week we have design a 3D model and using the modela mill out, from the machable wax my 3D design.

I have a problem in the lab here with keeping doors open and its probably due to those modern doorstops growing legs

and going walkies its starting to really get to me.

Which leads me to my design, the labs own personally design door stop.

I had modeled the door stop in 3Ds Max and had exported in .stl format.

When I tried the fab modules input .stl file to create a .png for the milling on modela it did not complete. I get the following message in terminal

png_path: no offset edges.

After having these problems and finding to resource online to troubleshoot I continued by creating my own .png file

with inkscape.

From this png I was able to complete the roughing process on the modela

When I tried the finishing pass the bit took a big plunge and the collet collided with the top surface of the wax.

I believe the depths I was trying to achieve was to great for the bit length, that was the cause of the error. Although I did not change the depth

of cut for the finishing pass.

You can see enlarged section of image, where the collet collided with the wax.

I have continued regardless to the next stage which is the silicone rubber compound mold.

The mixing, pouring and setting went will out error, so good infact it really shows how badly the milling process went.

The mold was since left on a table top at the mercy of stroppy teenagers who broke bits off and tore in two.

The final cast wasn't a bad result. Only problem is the cast material, as its cast from the liquid plastic its quite hard with no compressive properties.

Meaning it doesn't stay under the door and slides with the door as it closes.

The Fab Academy Assignments