• 4. Slide Rules: A Primer

    I’m a tool guy. I love tools of all sorts, be they software, hardware, shop tools, hand tools, or drafting tables. But I hold a special place in my heart for old tools, particularly those that performed a function in a simple and elegant way long-since forgotten in lieu of high technology. The slide rule is one such tool. My grandfather was a mechanical engineer and statistician, and a lifelong slide rule user. When I convinced him to give me one, I had no idea the obsession that would ensue.

    Because it’s such a powerful and elegant tool, I’ve created an entire primer intended to explain the basic ideas that underpin this beautiful tool. I believe that the slide rule teaches the underlying concept of logarithms in a way that modern teaching techniques do not.

    I’ve created a printable PDF document that explains the information below in more detail, and contains full-size graphics that can be printed for experimentation, as well as exercises to reinforce comprehension of each section.

    Download Printable PDF:
    sliderule_primer_081101_03

    11/01/2008
    Posted in Blog.

Blog

  • Simple Graphic Trainer

    The last release of this app was a huge step over the first, but this one is by far the best yet. As I get more advanced with Processing and Arduino (mostly the former), this thing’s gonna rock the house!

    New in version 007:

    • bezier curve replaced with more accurate box-plot
    • dynamic target speed allows for sprint-interval training
    • “honorSystem” mode allows user to choose whether or not to reset timer when current speed falls below target
    • average speed for entire workout is now displayed above current speed
    • new, easier-on-the-eyes visuals

    Download the code:

    I’ve got lots more ideas up my sleeve, but the wife is telling me that I have to actually do something productive with the rest of my day :( Laaaaaame.

    Cheers!

    Adam

    03/10/2010
    Posted in Blog.
  • Choosing a 3D Package

    So you’ve decided you want to create digital 3D models.

    You might be an aspiring movie special effects guru, industrial designer, architect, or mechanical engineer. Maybe you’re wanting to create photo-realistic images of product design ideas, or maybe you want to use 3D Computer Aided Design (CAD) to control a Computer Numeric Controlled (CNC) milling machine to bring your ideas into physical reality. You might be hoping to play with rapid prototyping, mechanical simulation, or 3D animation for art, illustration, or demonstration.

    Knowing the right 3D software package(s) will not make you a good designer, a competent engineer, or a film effects creative genius. It will simply be a tool in your belt, there when you need it, making it possible for you to communicate three-dimensional ideas quickly and accurately for virtually any purpose you can imagine.

    But when you look for a specific program into which you’ll invest lots of time and money, the number of options can be daunting. How do you decide which 3D program is right for you?

    There is no magic bullet in the 3D software world; every piece of software that exists on the market has a niche for a specific type of user with a specific combination of needs. In this set of posts, I’ll try to make the pros and cons of all sorts of common 3D applications easily understandable for the newbie, and hopefully even clear up a few things for the seasoned professional.

    In this, the first post in our series, we’ll be looking at the broader landscape of 3D applications, and discussing the basic categories of 3D applications. more »

    03/08/2010
    Posted in Blog.
    | 1 Comment
  • New Dropdown Menus

    If you haven’t noticed, I’ve added a new dropdown menu system at the top of the site. Under it you will find the highlights from a few of my main video tutorial series, as well as any other tutorial-related info I might like to add. This should help make it much easier to find the specific content you’re looking for.

    On a related note, I’ll also be going through and adding tags to most of the posts as well. Hopefully this will also help to make the content easier to find.

    These changes were made based on feedback from users like you! If you have any suggestions, do tell!

    Keep in touch,
    Adam

    03/05/2010
    Posted in Blog.
  • Public Service Announcement: Save

    Everybody knows that if you don’t save your work, you’ll lose it. Save early, save often, save iteratively.

    But there’s another detail I’d like to throw out there as well: if you’re using the demo version of Rhino, please be warned that after 12 hours of continuous running, the demo version of Rhino shuts down. If you have un-saved work, it will ask if you want to use one of your 25 saves to save it. If you click no, YOUR WORK IS LOST.

    The moral of the story is this: just use your 25 saves like normal saves. Don’t try to pinch and squeeze every last save out of the Rhino evaluation copy: if you like the program, just buy it. Then you won’t have any saving restrictions, and the world will be a happier place.

    02/22/2010
    Tags: .
    Posted in Blog.
  • 3DWorld, Issue 127!

    3DWorld Magazine issue #127 is now available in stores, and the modeling of the Bugatti Veyron is written and recorded by yours truly. Over six hours of video!

    *NOTE: The large rendering of the Veyron on the cover is not my model. The model I built is the smaller red car at the bottom left of the cover.

    02/19/2010
    Tags: , , .
    Posted in Blog.

Design for everybody, by everybody.

CADJunkie.com is devoted to making in-depth CAD knowledge available to anyone who wants it, free of charge. My sincere hope is that it will be complementary to great projects like Neil Gershenfeld's 'Fab Labs'; Arduino, RepRap, Contraptor, and others. CAD software is the missing link in the open-source hardware movement, and my goal is to make it accessible to everyone.

Enough jibber-jabbin'. Lets make stuff.

--Adam
Adam O'Hern, Industrial Designer