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Vertical carriage for Rostock

by Johann, published

Vertical carriage for Rostock by Johann Apr 7, 2012

Description

Rostock is a delta robot 3D printer.

This part is the vertical carriage for LM8UU and universal joints to attach two diagonal rods.

Newer versions of the OpenSCAD source files will be published here: https://github.com/jcrocholl/rostock

Recent Comments

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Hi great work , I'm from Mexico and I'm making one delta printer for my thesis please ¿May you help me with somethings? please PLEASE
deltabot.tumblr.com/post/28046966532

If they were loose enough to spin freely, the platform would have backlash and your prints would be inaccurate. The holes should be very tight, so that the M3 screws will cut their own thread into the joint pieces. First there will be some friction but after a while, they will move smoothly but wi
thout backlash.
Actually, I didn't realize there was a forum running, I'll move this over there, thanks! groups.google.com/forum/?fromgroups#!forum/deltabot

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License

GNU - GPL
Vertical carriage for Rostock by Johann is licensed under the GNU - GPL license.

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Instructions

Print three of these and attach each to a pair of LM8UU linear bearings with zip ties. To improve the horizontal constraint, you could use LM8LUU (45 mm long) instead of LM8UU (24 mm long) on one side, but this is optional.

Screw a M3x16 with a round head into the vertical hole to adjust/calibrate the top endstop. You shouldn't need to pre-cut the thread, it should fit very snugly if your printer is calibrated properly.

Put four M3 nuts inside the universal joints. Then insert four M3x12 screws with washers through these nuts and into the universal joint pieces. Tighten them pretty well to prevent the delta robot from unscrewing itself.

For all fasteners I recommend stainless steel.

Hi great work , I'm from Mexico and I'm making one delta printer for my thesis please ¿May you help me with somethings? please PLEASE
Hello! Very exciting reading about the Rostock. I just received a printed parts set I had someone print for me. It looks very high quality, but the universal joints seem very tight, is that normal or should they be fairly loose? Should the holes for the m3 nuts require drilling out?

Thanks so much for sharing this design.
deltabot.tumblr.com/post/28046966532

If they were loose enough to spin freely, the platform would have backlash and your prints would be inaccurate. The holes should be very tight, so that the M3 screws will cut their own thread into the joint pieces. First there will be some friction but after a while, they will move smoothly but wi
thout backlash.
Actually, I didn't realize there was a forum running, I'll move this over there, thanks! groups.google.com/forum/?fromgroups#!forum/deltabot
Can you specify the % fill and other important setting when printing these pieces.
Hello friend I
´m interested in your machine but wanted to ask if it can be operated with a pic because I have a cnc which would be modified to make a 3d printer but I wonder if you could help me with pregrama in C. if this is possible.

is an amazing machine

Thanks
What material do you recommend this be created from?

Shapeways has White, Strong
&
amp; Flexible - PA 2200
Until now I have only printed these parts with PLA on my Prusa Mendel. PLA parts are very strong and rigid, not flexible.

shapeways.com/materials/white_strong_flexible PA 2200 (Nylon 12) looks like it might work okay. 80 Celsius is probably not heat resistant enough for the parts near the hotend, which operates at 185 Celsius. But the vertical carriage is far away from the hotend so it may work okay.

I wo
uld probably try shapeways.com/materials/alumide instead, which is the same as above but with Aliminum dust mixed in. It is heatproof to 172 Celsius and more rigid.

If you get parts from Shapeways, please let us know how they work.
I'm very interested how Shapeways works out as well.

Somehow they calcualte the rods I uploaded as 194x194mm, no matter if I upload as mm or inches. Which calculates to... 274mm by theorem of Pythagoras.
Is this correct? And btw, what units do you use in your scad/stl Johann?

Full price for all printed parts (incl. airtripper's extruder) is about 5
00€ on Shapeways (all in White
&
amp;Flexible, which may not be the best choice for all parts ;) ). Ouch.
Your recommendation of one longer bearing - Is this from experience or a good suggestion?

And do you think that 3mm filament would work for a replacement for screws in the universal joints?
The longer LM8LUU was just an experiment to see if it would keep the carriage more horizontal. It doesn't seem to make a difference, except for added cost and weight.

I tried filament instead of M3 screws but the results were not very good. If you make the holes tight enough to avoid backlash, then there is so much friction that you can't push the filament in, and even if you did, the joint will not operate smoothly.
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