Xnaron Printable Magnetic u-joint option for Rostock Max

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Xnaron Printable Magnetic u-joint option for Rostock Max

Postby xnaron » Tue Apr 23, 2013 11:45 pm

After seeing the awesome Berrybot3D by Werner Berry I got magnet fever and had to have one. I did not have the time to cnc mill and lathe the required parts out of metal so I decided to see if I could make a printable part set. Well I did and it worked better than I could have ever hoped. I'd like to share it with the community so they can benefit from it. Please find the details below. Don't hesitate to post any questions you have in this thread. The details below are a work in progress and I will continue updating them as required.


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STL's:

https://github.com/xnaron/Xnaron-Magnarms-for-Rostock (openscad files to be uploaded in due course)


Parts:

- Magnets http://shop.revolutionmachines.com/3-8- ... 8-12pc.htm (BE CAREFUL NOT TO LET THE MAGNETS SNAP TOGETHER AND NEVER USE PLIERS ON THEM. THEY ARE FRAGILE AND CAN EASILY BREAK)
- Balls http://www.ebay.com/itm/380140413083
- Alum or carbon fiber tube x 6 @ exactly 240mm long
- 12 x 3mmx6mm cap head allen screws to be jb welded to the balls. Important: Clean the balls and the screws in an acetone bath before gluing.
- JB Weld (Mix it well)
- Assorted 3mm screws, washers and locknuts to mount the components
- CA glue

Optional Parts:

- Squirrel cage fans for cooling PLA. http://www.ebay.com/itm/180389680237
- os1r1s squirrel fan mount https://github.com/os1r1s-/misc-parts

Instructions/notes:

- Use a small dab of jb weld to glue the 3mmx6mm screw to the ball. I use one of the boom ends with the magnet in it in a vice to hold the ball. The magnet will help suck the screw down when you are gluing it. Let it cure under a lamp about 12" from the bulb.
- Use a 3mm washer under every ball on the effector and the cheapskate mounts.
- Use 3mm cap head screws to secure the cheapskate ball mounts to the cheapskate carriages.
- Use a longer 3mm screw to cut the threads for the balls in the effector and cheapskate ball mounts. Don't try and thread with the ball
- Use CA to glue the ball ends to the tubes if you don't have a push fit (don't forget to put the magnets in). Make sure all the arms are the same length.
- make sure you use 3/8" outer diameter tubes for the arms cut to exactly 240mm. This will match the firmware #define DELTA_DIAGONAL_ROD 269.0 // mm in configuration.h
- You need to #define END_EFFECTOR_HORIZONTAL_OFFSET 36.5 in configuration.h for the new effector. (if you don't do this you prints will be too large)
- The stock seemecnc hot end will work in this but don't use the standoffs. You want to keep the hotend away from the printed effector.
- I used 1/4" light ply to laser cut the all the dxfs EXCEPT for the J-Head groove mount which is thinner material.

BOWDEN Extruder:
- This bowden extruder derived from tscdan's excellent design.
- Files on my github
- Uses same ptfe pushfit that are on SeeMeCNC Rmax.
- Stepper Kysan 1040222 http://www.kysanelectronics.com/Product ... ordID=8318
- Gear on stepper from Stock Drive products. Part number: s10t05m022s0508 https://sdp-si.com/eStore/Catalog
- I am getting 60mm/s retracts with Rambo current set to 115. It is ultra quiet.

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Last edited by xnaron on Fri Jun 21, 2013 2:03 pm, edited 31 times in total.
The Xnaron Project http://xnaron.com find me also on youtube http://youtube.com/xnaron

3D Printers: Behemoth, Xnaron Prusa Bumblebee, Xnaron Prusa, Jolly Roger, MG Prusa, Rostock Max

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Re: Printable magnetic u-joint option for Rostock Max

Postby Flateric » Wed Apr 24, 2013 12:57 am

Very nice!

Are the files up anywhere?
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Re: Printable magnetic u-joint option for Rostock Max

Postby xnaron » Wed Apr 24, 2013 11:04 am

Flateric wrote:Very nice!

Are the files up anywhere?


Thanks. I will put them up after I run the first test which should be very soon. Stay tuned. :)
The Xnaron Project http://xnaron.com find me also on youtube http://youtube.com/xnaron

3D Printers: Behemoth, Xnaron Prusa Bumblebee, Xnaron Prusa, Jolly Roger, MG Prusa, Rostock Max

Find me on IRC: #reprap, #seemecnc

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Re: Printable magnetic u-joint option for Rostock Max

Postby xnaron » Wed Apr 24, 2013 8:09 pm

Need to verify the geometry is correct in the firmware but it works great!



The Xnaron Project http://xnaron.com find me also on youtube http://youtube.com/xnaron

3D Printers: Behemoth, Xnaron Prusa Bumblebee, Xnaron Prusa, Jolly Roger, MG Prusa, Rostock Max

Find me on IRC: #reprap, #seemecnc

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Re: Printable magnetic u-joint option for Rostock Max

Postby Flateric » Wed Apr 24, 2013 11:19 pm

Looks good, I wouldn't be too concerned about geometry if you have verified arm length, mounting position of balls.

I'd love to have a go at those files soon! LOL

Is holding power fairly decent? Think that it could support a dual hotend setup?
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Re: Printable magnetic u-joint option for Rostock Max

Postby jesse » Thu Apr 25, 2013 12:41 pm

Nice, I'm interested in trying it.

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Re: Printable magnetic u-joint option for Rostock Max

Postby cambo3d » Thu Apr 25, 2013 4:29 pm

looks nice, I'm going to mill some mounts out of 1/8" aluminum to try out, similiar to the berry bot but based on the seemecnc plateform.

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Re: Printable magnetic u-joint option for Rostock Max

Postby xnaron » Thu Apr 25, 2013 10:29 pm

I'll release the files soon guys. I just want to get it printing first. this should happen this weekend.

I calibrated the bed to within 1/1000". The left tower needs a slight adjustment but the other 3 positions are dead on.

The Xnaron Project http://xnaron.com find me also on youtube http://youtube.com/xnaron

3D Printers: Behemoth, Xnaron Prusa Bumblebee, Xnaron Prusa, Jolly Roger, MG Prusa, Rostock Max

Find me on IRC: #reprap, #seemecnc

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Re: Printable magnetic u-joint option for Rostock Max

Postby aerouta » Fri Apr 26, 2013 12:49 pm

nice

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Re: Printable magnetic u-joint option for Rostock Max

Postby xnaron » Fri Apr 26, 2013 7:00 pm

First print in progress

The Xnaron Project http://xnaron.com find me also on youtube http://youtube.com/xnaron

3D Printers: Behemoth, Xnaron Prusa Bumblebee, Xnaron Prusa, Jolly Roger, MG Prusa, Rostock Max

Find me on IRC: #reprap, #seemecnc

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