i'm designing a large delta printer and i was wondering.

3D Printing
,
1

i’m designing a large delta printer and i was wondering.
what joints do you guys use?

2

U joints! There’s been more than one report they are more rigid in the right directions.
But never played with a delta yet so no piratical experience.

3

I have never once heard anyone who used Traxxas balls speak well of them. Yet, by and large, every person I’ve ever heard using magballs have spoke nothing but the highest regards of them. Take that how you will…

4

what comment people about traxxas? they do not have backlash movements

5

@Javier_Prieto : http://www.thingiverse.com/thing:59283 - “The Kossel deltabot by Johann uses rods with Traxxas rod ends. These rod ends can have sloppy tolerances”

https://groups.google.com/forum/#!topic/deltabot/r5y1cCJ275s - whole thread is about Traxxas backlash.

http://forums.reprap.org/read.php?178,230812,page=3 - More backlash issues, having to install springs to keep it from happening

6

I don’t (think) I have any problems with traxxas. I got them pre-made at ultibots or tridprinting… i forgot. AFAIK, the secret is to freeze the metal parts for a while, and place the nylon in boiling water for a minute or so. Then carefully seat the metal inserts into the (hot) nylon in a machine vice.

7

oh… I don’t feel any obdvious backlash. I don’t think the traxxas are the main culprit of any backlash I do have. I’m doing kinematic calibration experiments, and my printer is pretty well measured. I get bed probes repeatable to about 30 micron. I have no reason to believe that the primary source of the 30 micron spread is the traxxas. There is pleanty of flex elsewhere in the system to give 30 micron.

8

I have magnetic joints. The problem with them is that they can detach if you hit a snag during print.

9

@Shachar_Weis do you think it’s fixable by larger magnets? Would ring magnets hold it stronger than disk magnets?

10

I don’t know. I use two beefy disk magnets.

11

@Shachar_Weis thanks.

12

thanks everyone for the input it helps a lot.

13

@ThantiK those links are very are full of information, but i tolk about its printing, all have the exact measuremes (20.00,20.00,20.00) without any corner out of the vertical. Maybe i will have that backlash later