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Nicholas Seward
Works at Arkansas School for Mathematics, Sciences, and the Arts
Attended University of Arkansas
Lives in hot springs, ar
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Nicholas Seward

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This seems really interesting. Which software did you use?
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Nicholas Seward

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On a whim, I checked Udacity today and it is now displaying my summer course (6475) under "My Courses".  However, it doesn't actually let me click through to the class yet.  I guess I can wait until Monday.  (I am crossing my fingers that it will open up sometime this weekend.  Anyone know when it usually opens up?)  I am just so excited to continue after surviving 6210, 6250, and real life.
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"I am just so excited to continue after surviving 6210, 6250, and real life."  That pretty much sums up my point of view too -- 6310 and 6475 in my case. :)
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Nicholas Seward

➥ 3D printing  - 
 
 
Just a crazy idea that isn't very practical unless you want a wall mounted 3D printer.
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+Yao van den Heerik In this configuration, very little.  It is all a matter of what you design for.  If you want it to hold 10 lbs then you can make that happen.  You just have to pay for it in other areas: cost, speed, acceleration, overall weight.
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Nicholas Seward

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Just a crazy idea that isn't very practical unless you want a wall mounted 3D printer.
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this is actually really nice. Think about it this way. you can hide a lot of the cables and motors under the base. you can also put a plexi-glass case around it so that it keeps the temperature the same and you dont have too many extruder problems. On the base you can put a display to make it easier to monitor the extent of the print. In all fairness this looks like a good idea.
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I did a study on how different SCARA geometries are susceptible  to miscalibration.  I looked at 3 different types but in the end they all had very similar results.  The GIF shows the effect of using a mechanical advantage from 95% to 105% of the actual value.

What can this tell me?  Not much.  I really just wanted a side by side of many different geometries so I could qualitatively pick the most resilient one.  They all turn out to be very close to each other.  It does look cool.

The grid is 200x200mm.  The shoulder is 75mm to the left of the gray grid.  The gray grid is the ideal the black grid is where the machine will actually go.  The machine had two 150mm arms.  The mechanical advantage I used was 10.

Cases I considered...

Case 1: Morgan
Case 2: 1-arm SCARA.  Forearm driven from static stepper over the shoulder.
Case 3: 1-arm SCARA.  Forearm driven from a stepper on the first arm.
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+Jonathan Lussier  I wrote a java program that generated a bunch of images and then I used virtualdub to put them together.  I can send you the code if you are interested.
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Have him in circles
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Nicholas Seward

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The parametrically designed CoreXZ is alive. I am now going to make versions for all occasions. Jumbos ones. Baby ones. This will be great for build workshops.
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Well, I'm interested in the one version that might fit my existing CoreXZ.  ;)
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Nicholas Seward

Discussion  - 
 
 
Just a crazy idea that isn't very practical unless you want a wall mounted 3D printer.
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Speaking of the maths, how can a firmware determine the physical limits of the carriages? For example at home-position you have no horizontal freedom in the effector, but this gradually increases as Z moves down. I would also like to be able to limit the carriage positions so that at any Z height they can't move beyond reasonable heights over Z. Thus, if you ask for an "illegal" position, the firmware can either forbid the move, or just put the effector at the nearest "legal" position. Essentially to prevent damage to a delta in the case where crazy coordinates are given to it.
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Just a crazy idea that isn't very practical unless you want a wall mounted 3D printer.
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+Mike Creuzer The string will run up to the top of the rails and you just pull in or let out some string.  It will act just like an arm.  An arm that can change length.  (The other arms would need to get shorter to make this work well.  The cool thing is that the build volume will be similar to other deltas with rails and arms of the same length.)

I am in the sketching mode to see if I can make this into a nice foldable stowable package.
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I am excited to see a handmade CoreXZ in the wild.  Thanks to +Christopher de Groot for a video of your build.  I have to say that his print quality is better than mine due to the geared extruder.  (It is super impressive that he made the laser cut parts by hand.  I should really design an shop tool version.)
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Have him in circles
808 people
Kevin Pauba's profile photo
Chris Dillon (Onemouse)'s profile photo
Hodge Hunter's profile photo
Josh Gardiner's profile photo
evan west's profile photo
Fernando M Landaluce's profile photo
Alessandro Torre's profile photo
Andrew Blumhardt's profile photo
mccrappy1's profile photo
Work
Occupation
Teach Computer Science
Employment
  • Arkansas School for Mathematics, Sciences, and the Arts
    Computer Science Instructor, 2010 - present
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
hot springs, ar
Previously
fayetteville, ar - bentonville, ar - gentry, ar - alma, ar - rogers, ar
Story
Tagline
I am a nerd and a computer science teacher. You say redundant. I say a lot of a good thing.
Introduction
I like to ride motorcycles and I love to rock climb.  I have a mechanical engineering degree.  I am a math and computer science geek.  I love to build things and if those things have some neat mechanisms, awesome.
Bragging rights
Simpson, Wally, Sextupteron
Education
  • University of Arkansas
    Mechanical Engineering, 1999 - 2003
Basic Information
Gender
Male
Birthday
March 14, 1981
Relationship
Married
Other names
Nick