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week 7 - Computer Controlled Machining : Local Session#

  • Author : Kai Naito , Asako Okazaki, Yosuke Tsuchiya (Fablab Kamakura)
  • Date created : 2/20/2019
  • Last updated: ⅜/2023

Assignments & Goal#

Group assignment#

  • do your lab’s safety training
  • test runout, alignment, fixturing, speeds, feeds, materials, and toolpaths for your machine

Individual Assignments#

  • make (design+mill+assemble) something big (~meter-scale)
  • extra credit: don’t use fasteners or glue
  • extra credit: include curved surfaces

Learning outcomes#

  • Demonstrate 2D design development for CNC production
  • Describe workflows for CNC production

Have you?#

  • Linked to the group assignment page
  • Documented how you designed your object (something big)
  • Documented how you made your CAM-toolpath
  • Documented how you made something BIG (setting up the machine, using fixings, testing joints, adjusting feeds and speeds, depth of cut etc.)
  • Described problems and how you fixed them
  • Included your design files and ‘hero shot’ of your final product

Refer to Assessment page

Time table on Onsite session#

  • ~ 3/9(Thu)

    • CAD Design

  • 3/10(Fri)

    • 09:30 AM Confirm the CAD Data and Make CAM file by VCurve
    • 11:00 Group Work
    • 2:00 PM
      • Student A Start
    • 4:00 PM
      • Student B Start
    • 6:00 PM
      • Finish to Machine Work and Cleaning up the Lab
    • ~ 7:00 PM
      • Fab Lab Minatomirai Close Time. We have to leave before this time.

  • 3/11(Sat) - Optional

    • 11:00 AM ~ Individual Works
    • ~ 6:00 PM Finish to Machine Work and Cleaning up the lab
    • ~ 7:00 PM Fab Lab Minatomirai Close Time.

Advices from Instructors#

  • Overview of Assignment Works

  • To be done before cutting:.

    • Design the assignment, prepare 2D vector data (dxf, svg, etc.), and even CAM data production. The data should be parametric so that it can immediately reflect the actual measurements of the material and the results of the condition setting on the day of the workshop.
    • Modeling notes:
      • (group) Model to match “Test runout, alignment, speeds, feeds, and toolpaths”. At a minimum, offset measurements are acceptable, and horizontal and vertical measurements should be taken to determine what the model will look like under the current conditions.
      • Conditions:
        • machining area is 900mm x 1800mm, only one 900mm x 1800mm scale material for each assignment (one for group assignment, each student can use one material for individual assignment)
        • Bits are only ¼ down cut…
        • Other conditions modeling for measurement will be marshed…
        • Priority to individual assignments.
      • Sample: Offset (kerf in CCC) Generator by Atsufumi Suzuki (2022 Graduate from Kamakura)
      • (Individuals) Models should be made using CNC cutting, and joints should be made for ease of use.
      • (Individuals) 3D models will be made by Mold & Casting, so 2D models are fine.
      • (Individuals) Due to the fact that we will be borrowing the work space, we cannot extend the work period. Each person should try to keep the cutting time within 2 hours - if there are many pockets or if kerf bending is used a lot, the cutting time tends to be longer.
    • CAM setting values

IMPORTANT! We will borrow an outside lab (23’: Fab Lab Minatomirai).#

  • Please be punctual
  • Safety precautions
  • Waste materials are to be brought back to the workshop.

Safety precautions

  • Wear safety glasses
  • No sandals
  • No loose-fitting clothing
  • Long hair must be tied up
  • No gloves
  • No touching energized tools
  • Do not operate machines alone
  • Know how to perform an emergency stop before starting equipment
  • Pay attention to machine works, and stop immediately if anything trouble happens.

In Japanese

  • 切削までにやること：

    • 課題をデザインし、2Dベクターデータ（dxf, svgなど）を用意し、CAMデータ製作まですること。 データは、当日、材料の実測値や条件出しの結果をすぐに反映できるように、パラメトリックに作成してください。
    • モデリングの注意点:
      • （グループ）”Test runout, alignment, speeds, feeds, and toolpaths”に合致するモデルの作成。最小限ではオフセットの測定ができればOK。水平垂直を測定は、今回の条件下でどのようなものが作れそうか考えてモデリングしてみてください。条件:加工エリアはサブロク、測定用の材料はサブロク1枚のみ。ビットは¼ダウンのみだが先方から借りることができるかも？その他の条件測定用モデルは沼になるので時間に余裕があったらで良い。個人課題を優先とすること。
      • （個人）CNCの切削を活かしたモデルをつくること、接合部をつくっておくと安心。
      • （個人）3DはMold&Castingでやるので2Dで良い
      • 作業場所をお借りする都合上延長ができません。各自切削時間が2h以内に収まるようにすること–ポケット加工領域が多かったり、カーフベンディングを多用すると長くなりがちになります。CAM内で切削概算時間が出てくるのでCADとCAMの行き来をしながら制作を進めると良いと思います。
      • EMARF Guide
    • CAMの設定値：

  • 外部の作業所をお借りします

    • 時間厳守でお願いします
    • 安全には注意
    • 廃材は基本持ち帰ること

  • 安全上の注意

    • 保護メガネ着用
    • サンダル禁止
    • ゆとりのある服は禁止
    • 長髪は結ぶ
    • 手袋禁止
    • 通電しているツールに触らないこと
    • 一人で機械を操作しないこと
    • 機材を起動する前に、緊急停止の方法を把握しておく

note / tips#

Class review#

Announcements#

Recitation#

  • 3/13: Debugging

Start Final project tracking page!!!#

Support documents#