My Build

My Build

Postby Nicholas Seward » Mon Dec 09, 2013 1:50 am

Files are here

I am ordering the 7/16" screws on tomorrow. Can't wait.
Nicholas Seward
 
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Re: My Build

Postby Nicholas Seward » Wed Jan 01, 2014 10:41 pm

squirrel.jpg
squirrel.jpg (482.04 KiB) Viewed 66526 times

Here is my first good print! I think most of you will agree this is pretty close to the gold standard.

Videos

Upside down print.
http://youtu.be/T9ArP3Ies8k

Slow Print!
http://youtu.be/EMiPkpDFzuQ

I did a whole laundry list of tweaks. I designed and tested a better filament drive. I shortened my bowden tube. I decreased the current for the steppers. I added a spool holder. I am going to see if I can get calibration going tonight to enable full bed prints. It doesn't sound like much now that I list it but as lazy as I am it took a ton of Twilight Zone episodes to get it done.

I hope to switch over to the 7/16" screws or make a new LISA with the 7/16" screws soon.
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Re: My Build

Postby uncle_bob » Wed Jan 01, 2014 11:02 pm

.... the links are backwards ...

Other than that - very impressive !!!!!
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Re: My Build

Postby Nicholas Seward » Wed Jan 01, 2014 11:10 pm

Fixed. Thanks!
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Re: My Build

Postby Rasputin73 » Wed Jan 01, 2014 11:56 pm

Hey Nicholas,
I'm a long time lurker, I've been watching your designs and progress almost daily since the original Simpson Gada prize design. Anyway, I love the elegance and purity of the engineering for the whole Simpson family.

In relation to the LISA Simpson I was wondering what you think the improvements over a standard delta (Rostock, etc...) are? RepRap-ability is clearly one, but how do they compare on price, performance, or any other metric you can think of.

Thanks, and keep up the amazing work!

rasputin73 (Matt)
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Re: My Build

Postby Nicholas Seward » Thu Jan 02, 2014 1:04 am

I originally didn't see much value to this design but figured it would be a fun build for my students. It is almost an oxymoron. Simpson's are suppose to be free of linear motion. I have since broadened my internal definition of a Simpson to be a delta robot with no spherical joints.


Here are some points when comparing it to a Rostock style bot.
Pros:
[*]Simplicity
[*]Maintainability
[*]Easy to RepStrap
[*]Easy to assemble
[*]No spherical joints
[*]Possibly cost but not yet.

Cons:
[*]Less rigid (It is easier to twist the hub.)
[*]Speed (I have been able to go faster than my filament drive can go.)
[*]Cost (The screws are pricey but now that I have verified the design I will try to make a RepStrap with super cheap components. I just need to hit 60mm/s to be acceptable.)

I actually view LISA as two systems. The screw drive and the arms. You could use the arms with a belt /rail setup and you can use the screw drive with Rostock arms. Since LISA can get away with one long metal thing per arm I thought I would test out the screws with the Simpson style arms.

After playing with LISA for a while, I prefer the ease of maintenance of the screws over the filament drives. Even if I can't get the cost down (which I should be able to) I think many will see that the extra cost is worth it.
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Re: My Build

Postby owens-bill » Thu Jan 02, 2014 1:18 am

Now that is an impressive squirrel. Well done!
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Re: My Build

Postby Guizmo » Wed Jan 08, 2014 3:15 pm

WOW! :o

I didn't know you already had a working LISA!!

Can you post a picture of the machine please?
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Re: My Build

Postby Nicholas Seward » Thu Jan 09, 2014 4:29 am

There is a pic here. She is about to look quite a bit different. Version 2 will have a bigger taller build volume and a smaller footprint.
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