Designing Precision Gantries from imprecise parts

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Joshua Vasquez
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Designing Precision Gantries from imprecise parts

Postby Joshua Vasquez » Sun Jan 01, 2017 12:07 pm

Hey folks,

I just finished a post on designing precision frames with structrural framing systems (80/20, Rexroth, Makerslide, etc.). This post is the distilled "lessons-learned" from spending 2016 designing/building my homebrew laser cutter frame.

May it be of use to you in your next 3D printer or laser cutter build!

https://hackaday.com/2016/12/14/a-how-to-in-homebrew-design-fab-and-assembly-with-extruded-profiles/
Homebrew 60-watt laser cutter built from VSlot extrusions, LightObject components, and controlled with LinuxCNC; 450mm (Y) x 600 (X); Laser Homes to BL

Joshua Vasquez

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Keith Sherwin
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Re: Designing Precision Gantries from imprecise parts

Postby Keith Sherwin » Sun Jan 01, 2017 12:28 pm

Very interesting and nice write up.Thanks for sharing that.
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Ron Gosnell
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Re: Designing Precision Gantries from imprecise parts

Postby Ron Gosnell » Sun Jan 01, 2017 2:00 pm

Why was I born so stupid. That's a great article way above my head.
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sebastien laforet
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Re: Designing Precision Gantries from imprecise parts

Postby sebastien laforet » Mon Jan 02, 2017 12:58 am

very interesting writeup. thank you.

juste one question, does anybody know why the frame systems do not include "diagonal" components. in order to have squareness that does not move under efforts, the triangulated frame would be more resistant, when a square has no rigidity beyond the connectors..
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fred ungewitter
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Re: Designing Precision Gantries from imprecise parts

Postby fred ungewitter » Mon Jan 02, 2017 4:19 am

Some designs require that the space within the frame provide for moving parts. A diagonal support would cause collision. In the case of the analysis presented here, the addition of gussets are effectively diagonal supports.

I'm a fan of diagonal supports for the rigidity of the design. Truss bridges, towers and similar construction use diagonals (triangles) to provide strength without excess additional weight.
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