Assignments
Group Assignments
- Do your lab's safety training test runout, alignment, fixturing, speeds, feeds, materials, and toolpaths for your machine
Individual Assignment
- make (design+mill+assemble) something big (~meter-scale) extra credit: don't use fasteners or glue
extra credit: include curved surfaces
GROUP ASSIGNMENT
More specific detailed from the worked done with Ernesto Castro in Fab Lab Universidad de Lima here
Fab Lab Ulima s a f e t y t r a i n i n g
Setting the 3000 series Multicam Router CNC.
The machine we have at Fab lab Ulima is the 3000 series Multicam Router CNC for an area of 2040mmx1200mm. I hve never used this machine. The instructor and the machine worker give me the first steps and security steps to start. First I was gave a lab coat, safety earmuffs, gloves, glasses and I had to wear safety shoes with steel tip, and I use my construction boots that has them.
To start the machine I had to identify its parts. Where to turn on, whereto turn on the air suction, where are the mills and where is the command control.
The machine works with EnROute Software Where to select the mill, passes and cuts for the machine.
Settings
Setting EnRoute.
Tests t o l e r a n c e s and dog-bones tangents
My part of the group testing was to test tolerances. I did some joitns for my individual proyct, also texting how it cuts curves. I tried to make some dog bones different by the tangent of the 6.2mm circle for the mill of 6mm. The best one was the 19.5mm for plywood of 19mm. It was safe to joint and not forced. So I choose to make my individual project in this material.
S P O I L E R a l e r t
Plywood of 19mm is TOO HEAVY. Everything connected, however with two pieces it starts to be so heavy and the joints are so precise that it involves applying force to some parts to fit them together. It also involves twisting the entire structure to secure it at the bottom and then at the top.
INDIVIDUAL ASSIGNMENT
nature coffee t a b l e
sketches
Following the drawings in my cyanotypes, and the fact that in my housethere are lots of plants and new pots that my mom likes to show I thought about making a new coffee table for my living room that comes from nature curves of a tree and focus on the plants pots.
Parametric design
I made some first curves I wanted the limits of the table to look like. And then to make the structure I choose a waffle structure in grasshopper with bowerbird to avoid extra joints and to have the option of changing the joints space and material thickness. Also I did the nesting in grasshopper in an area of 2.40 x 1.20 m that is the area of the plywood.
The initial idea was this way, so that only the two edges would support the acrylic as a conventional table but an organic base. However, when assembling it, two things happened. Gravity got the better of me, and it was easier to assemble it upside down. And also I realized that the idea to highlighting my mom's flower pots would be better this way.
Original form and change while making
dog bones
To make the dogbones in the nesting I tried importing it in Fusion, however I couldn't make it there I think because of the lots of curves of the forms. However I found a way to make the dog bones in rhino with a phyton script I download from a rhino forum here.
I also found a rhino plugin that makes the same but i cound't make it work. It is listed here.
From recommendation of my instructors I gave a diameter of 6.2mm for a 6mm mill since it has to have a minimun tolerance. Also de joints for 19mm plywood are made with 19.5mm as in the group test it fit perfectly with not much pressure.
Dog bone script in rhino
p r o c e s s
G code
cutting
Taking out the pieces
structure upside down
Table in my living room
