Suggested Design Changes

[Cozmicray]

Taking See3d's changes and incorporating
into Revision A

Printed parts Orange, Metal/lexan track Red , Backboard White

Wally no arc Z-Axis RevA

WALLY_Z_3_sj.jpg (25.23 KiB) Viewed 71809 times

anybody savvy in Sketchup / CAD want to do the printed parts?

[see3d]

Looking better with each revision. I am not CAD proficient yet, so all I can do is kibitz for now. Your original idea of aluminum "U" channel into the backboard was not a bad idea. If the channel is straight and a good fit to the thickness of the board (epoxy?), and can be attached so that it is backed up by the strength of the board and made parallel in the opening, it would resist the forces of the cantilever without flexing. That could be accomplished with 2 half backboards that were tied together top and bottom after the metal channels are attached.

The carriage itself needs to have a rigid member between the left-top and right-bottom bearings so that it does not flex and tilt the bed. Perhaps the missing middle piece of the backboard...

I bet that Nicholas could have helped more with this if he were not away right now.

[Cozmicray]

Noarc Z-Axis rev B

Added brace.

Wally Z-axis Rev B

WALLY_Z_Rev_B_j.jpeg (77.09 KiB) Viewed 71800 times

[see3d]

Yes, Rev B looks ready to build for proof of concept.

The advantage is it gives Wally a larger print area in the Y axis, and it is easy to extend the Z axis with virtually no printed parts change. It also takes less bearings -- in trade for some metal bars.

I had discussed several straight Z axis variations with Nicholas some time ago, but I am now liking your variation the best of the straight ones.

[fabrice]

hi everyone
a quick attemp to put your idea in 3d
(i put the file on dropbox, too big for the forum !)

https://dl.dropboxusercontent.com/u/460 ... ynoarc.PDF

[Ralphxyz]

fabrice, all I see is a cover page!!

Ralph

[cdsteinkuehler]

fabrice, all I see is a cover page!!
Ralph

It works for me. Note it's a 3D PDF file, which likely isn't supported in much other than the actual Adobe reader. I've also had to explicitly enable viewing 3D PDF files in some versions of the Adobe reader.

[Cozmicray]

fabrice
Great! I can view it in pdf 3d

Can you breakout the individual parts and show them?

Are there STL files for them?

[fabrice]

give me one day or two and i will produce stl file, no problem
just need to tweak it a little bit more

3d edrawing: https://dl.dropboxusercontent.com/u/460 ... ynoarc.zip

[fabrice]

happy new year to everyone