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assignment3.md 5.07 KiB 
title: Computer Controlled Cutting. Group 2 Work. 
summary: Group work. Characterizing laser cutter. 
show_authors: true
authors:
    - name: Akseli Uunila
      url: http://fabacademy.org/2023/labs/oulu/students/akseli-uunila/
    - name: Abhishek Kumar
      url: http://fabacademy.org/2023/labs/oulu/students/abhishek-kumar/
    - name: Aarne Pohjonen
      url: https://fabacademy.org/2023/labs/oulu/students/aarne-pohjonen/

Group work for week 3

Cutting a test piece and measuring the dimensions

First we laser cut a 20.0mm x 20.0mm square. However, closer inspection reveals that is not what we get:

kerf kerf kerf

drawing: 20.0 mm x 20.0 mm

measurements: 19.77 mm x 19.87 mm x 2.85 mm

From this we can calculate the kerf. It is the theoretical width - measured width, which for this material was 0.18mm.

Testing to change the focus of the laser cutter

We tested the change the focus of the laser cutter. First we set the optimal focal point using a tool with the laser cutter. We changed the focus 1 mm above and below the optimal focal point, and also 4 mm above and below the optimal focal point. The results are shown in the Figure 1. We first used settings for MDF material but later we realized that the material was actually HDF, and we changed the settings. As can be seen from Figure 1, there is little difference but we used HDF setting from that point on.