Alpha 4

[Mike Stegen]

Hi,

Here are some pictures from my Alpha 4 build.
btw this google groups editor sucks bigtime, can't seem to align the pictures at all..

And yes i forgot to include 5 nuts inside the extrusions on the bottom and the top as well ;-)

[Karl]

Dagnabbit! Mike's ahead of me!

Nice job, Mike. :)

]

[Mike Stegen]

Progress ;-)

It moves nice by hand, but positioning the effector near the extrusions, and it will bind.
Hopefully magnetic ball joints will fix this.

[Michael Anton]

I'm eagerly watching your build, as it seems similar to what I am planning.  It's looking pretty good so far!!!

Mike

[Michael Stegen]

Did some fast movement tests on my alpha 4 FPD.
20000 mm/min

Any faster and it starts missing steps.
I could probably increase the motor current, but right now it looks fast enough for pnp-ing :)

http://youtu.be/KeYqakPn5Qc

Op 9 sep. 2014 00:05 schreef "Michael Anton" <3d.m...@gmail.com>:

I'm eagerly watching your build, as it seems similar to what I am planning.  It's looking pretty good so far!!!

Mike

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[Neil Jansen]

WOW, very nice Mike :)  I'm extremely impressed.  

[Christian Lerche]

Very nice!!! Now that's even fast than I thought it would move!

[Mike Stegen]

Thanks,

If Karl and you want me to test anything, let me know, i'm ready.

[Michael Anton]

That works out to 333.3mm/s.  My cartesian reprap safely does 300mm/s, so that is within the range of what we should expect with an arduino driving it.  Others have achieved much higher speeds by moving to ARM processors, as the skipping can be caused by inaccuracies in timing at high step rates.  I'm planning on using 400 step/rev motors, so my speed will be half of that. :-(  At least I won't be relying on microstepping quite as much for increasing the resolution, which is tends to be inaccurate.

It might be nice to add stepper motor type, and microstepping settings to the machine comparison build sheet.

Mike

[Karl]

Mike, I just saw your video. It's awesome!

FPD3 is moving much more slowly and carefully. ETA on software for you to test is 1-2wks. To incorporate error adaptation, we need to switch Marlin back to cartesian and do Pi delta calcs.