CAD CAM tutorial

CAD CAM tutorial
by D.  Scott Williamson

This tutorial will show you how to use Computer Aided Design and Computer Aided Manufacturing or CAD CAM tools to create and preview a Gcode file of the Workshop 88 logo that can be run in a 3 axis CNC Mill.

Background

There are 5 main types of machine operations

  1. Engrave (follow path): The tool tip will follow the 3D path provided.
  2. Profile: The tool edge will follow either the inside or outside contour of a path down to the specified depth.
  3. Pocket: The tool will remove all the material within a contour down to the specified depth.
  4. Drill: A drill routine will be executed at each point location.  Drill routines come in 2 flavors:
    1. “Peck” used with drill bits, drills to successively deeper depths liftig the bit out of the work regularly to clear chips from the flutes.
    2. “Spiral” used with endmills that are a smaller diameter than the finished hole.
  5. 3D relief: The tool tip will remove material above a 3D surface usually specified in a 3D model or a 2D height map image.  There are two main modes:
    1. “Waterline” similar to inverted pocket operations where bulk material is efficiently removed outside the 3D model to a number of stepped depths resembling waterline in a topological map.  Typically used in a first pass with a large roughing bit to remove the bulk of the material.
    2. “Raster” moves the tip of the bit smoothly over the model in a raster pattern.

Gcode is a “numerically controlled programming language” which is why a Gcode file extension is typically .nc.  It is a human and machine readable text file.  You will rarely if ever need to look at or edit the Gcode.

Overview

This tutorial will demonstrate Engrave, Profile, and Pocket operations, which are the most popular.

There are 4 steps to this tutorial:

  1. Create a .svg file containing paths needed for machine operations
  2. Create machine operations
  3. Export Gcode
  4. Simulate, visualize and validate

Continue reading

Upcycled LCD Entertainment Center… and Paper Elephants

This past Thursday night gathering at the Workshop, Rick Stuart showed up all smiles- though I’m not sure if this was due to his enthusiasm to show off his new gadget or in anticipation of Rachel’s shortbread which had been announced earlier via email.

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Rick with his entertainment center

Rick has built a personal entertainment center which has the capacity to display high-defintion videos and music through an upcycled touch-screen LCD. Rick had recovered some of these screens from his previous workplace and had decided to put them to use in a new project. He has created a running loop for the system to operate: he utilized a Raspberry Pi running OpenELEC in order to run XBMC (a media center) and connected an HMDI cord to a LVDS adapter board. The adapter runs to the LCD, which is connected by USB to the Raspberry Pi. For sound, the system will be attached to speakers. Files are stored on an SD card inserted into the Raspberry Pi, and streamed files are accessible through connecting an ethernet cord.

By using HDMI instead of the normal video output connection, Rick was able to make his display high-definition. Rick said that a great advantage about his system is that he was able to essentially create his own media center out of materials he already had on hand plus the low cost of a Raspberry Pi.

Meanwhile, Zach showed me how to create very intricate origami elephants using printer paper. While there’s no hope of me recreating one on my own, I thought it was important to highlight how awesome they turned out.

Processed with VSCOcam with f2 preset

Workshop 88 walk-through at public meeting

Two of the questions we often get at Workshop 88 are: “How many people show up to your public meeetings?” and “What usually goes on at your public meetings?”

If you’ve been wondering the same things about Workshop 88, take a look at what was going on during our last meeting:

If you’ve never been to Workshop 88 before, the video gives a sense of how the makerspace is laid out.  We have four areas from front to back: meeting room, wood/metal shop, electronics/rapid prototype lab, and multimedia room. All the rooms get a lot of use; it just happened that when the video was shot there were not many people in the back rooms.

Come out some night and make something with us!

New meeting schedule

Workshop88 is happy to announce a new meeting schedule staring February 2012. Meetings will be at 7 pm Thursday evenings every week, and the open hack night will be Monday nights. Class schedules and the meetup schedule will be updated to reflect these changes. Board meetings will be scheduled once a month.

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We look forward to seeing you at our new weekly meetings.

02/14 Meeting canceled

Steampunk Heart by chibilady17 via deviantart.com
For obvious reasons our Public Meeting, scheduled to occur on Monday, February 14, 2011 6:30 PM has been cancelled. We may be rescheduling this meeting for a later day in the week or the following week.

Keep your eyes peeled, and enjoy your Valentines Day!

UPDATE: We’ve shifted the meeting schedule by one week to accommodate. Our meetings will resume our normal every other week schedule starting on the 21st of Febuary. Our Meetup and Eventbrite calendars have been adjusted to reflect this change.

Labor Day! No General Meeting Until Sept. 13

We’re shifting the general meeting by a week, since the next one would fall on Labor Day, and we don’t want to interfere with the long weekend.

The next meeting will be on September 13th, at 6:30pm.

The main topic of discussion will be classes to be held at the space.

We’ve got a preliminary list of classes we’re planning on offering, but we’d love other suggestions, so come on out on the 13th and give us your input!