Wally's Electronics

Wally's Electronics

Postby Cozmicray » Fri Dec 13, 2013 12:03 am

RAMPS/MEGA
mounted in a place that makes it hard to get to.
Adjusting steppers
Plug / un-plug connections

Should include cooling fan for stepper drivers and MOSFETs

:?:
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Re: Wally's Electronics

Postby Nicholas Seward » Fri Dec 13, 2013 12:27 am

Is this a question?

I am sure everyone has their own way they like to do electronics. I used an Azteeg X1 and it ran cool enough without fans. There is no reason you couldn't add one.
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Re: Wally's Electronics

Postby Cozmicray » Tue Dec 17, 2013 11:23 pm

Is there a wiring diagram for Wally out there?
Where?

I'm using a mega with a RAMPS 4.1 on it

but what stepper motors go where would be helpful?

??Where is the firmware??

Tnx
:?:
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Re: Wally's Electronics

Postby cdsteinkuehler » Wed Dec 18, 2013 12:33 am

Cozmicray wrote:??Where is the firmware??


Wally uses standard firmware, so pick your favorite flavor (Marlin, Sailfish, etc).

There is a gcode pre-processor you run on your sliced gcode to convert normal XYZ axis values into Wally's peculiar shoulder angle values. The pre-processor can be found in github, alongside the Wally design files. Nicholas hasn't specified how you set the units/gain (steps/degree, maybe?), but I assume it should be fairly obvious if you look at the gcode pre-processor source.

...unless, of course, you're as crazy as I am. I'm running LinuxCNC on a BeagleBone to control my Wally and Simpson, with custom real-time non-Cartesian kinematics (so I can use normal gcode, no pre-processing necessary). I'm still building and printing, however, so it will be a bit until I have kinematics modules uploaded to github.

But you said you're using Mega/RAMPS, so just use Nicholas' gcode pre-processor and the firmware of your choice. :)
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Re: Wally's Electronics

Postby Cozmicray » Wed Dec 18, 2013 1:04 am

Thanks
Looking for
Left XY motor ----- >????? on RAMPS
Right XY motor ----->?????
Z axis motor ------> ?????
Extruder Motor -----> ?????

I suppose I could guess and swap things around
but I thought I'd ask for what the real instruction might recommend.

So in Marlin there is a selection for "WALLY"

I am crazy running windoze XP 64
would like to use Repetier-Host
Linux on my Raspberry Pi but I am linux handicapped

DOAK
:?:
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Re: Wally's Electronics

Postby cdsteinkuehler » Wed Dec 18, 2013 1:40 am

Cozmicray wrote:Looking for
Left XY motor ----- >????? on RAMPS
Right XY motor ----->?????
Z axis motor ------> ?????
Extruder Motor -----> ?????

I suppose I could guess and swap things around
but I thought I'd ask for what the real instruction might recommend.

So in Marlin there is a selection for "WALLY"

I am crazy running windoze XP 64
would like to use Repetier-Host
Linux on my Raspberry Pi but I am linux handicapped


Left & Right motors will be X and Y on your RAMPS, I'm not sure which is which so you may have to swap them. Z and E will be the Z and E0 axis on RAMPS, respectively.

There is no selection in Marlin for Wally, just select the physical board you're using (ie: Mega + RAMPS) so the pinout is correct.

You can use Windows to communicate with the printer, but you'll need some way to run the Python gcode pre-processor. IMHO, it's much easier to run Python scripts on Linux, but there are various Pythons available for Windows as well. Regardless, the platform you run the gcode pre-processor on has no bearing on what you use to communicate with the printer.
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Re: Wally's Electronics

Postby Nicholas Seward » Wed Dec 18, 2013 3:53 am

Left motor is X. Right motor is Y. Z and E as you would expect.

Set the xy steps/mm in such a way that the firmware thinks one rotation is 400mm.

I need to do that for z also and do all the tough math. For now just calibrate it to be about right.

Redoing the preprocessor is on my list. It is not right. The transformation is right but the speeds are not right. I am missing something obvious.
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Re: Wally's Electronics

Postby Cozmicray » Fri Dec 20, 2013 12:22 am

"Set the xy steps/mm in such a way that the firmware thinks one rotation is 400mm."

What does this mean? In marlin you set steps/unit X, Y, Z, E
So what is it for Wally?

Right , Left facing Wally or from back of Wally?

I have put a Freaduino MEGA 2560 with RAMPS4.1 on my Wally

1. Can't find a driver for this for Win XP 64 (or any other 64bit system)
2. Plugged it in to a mac, loaded marlin
Used Repetier_Host to run it ---- all I get is motor buzz
wiring of phases seems right
driver pots set OK

Anybody have experience with this Freaduino MEGA 2560?

:?:
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Re: Wally's Electronics

Postby Nicholas Seward » Fri Dec 20, 2013 1:23 am

I have no experience with your controller.

Left when facing Wally.

Most steppers have 200 steps/rotation. Some are 400 steps/rotation. You need to multiply that by your microstepping mode to know how many microsteps/rotation. For instance, I use 1.8 degree steppers (200 steps/rotation) and 1/32 microstepping. That is 6400 steps/rotation. This translates to 16 steps/mm.

You can always use 32bit drivers when you can't find 64bit drivers.
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Re: Wally's Electronics

Postby Cozmicray » Fri Dec 20, 2013 4:11 am

What controller do you use?
What Firmware.

in Marlin
DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200.0*8/3,760*1.1} //default

Right now on a Ordbot hadron I use 2760 steps / mm on Z-zxis M8 leadscrew
Steppers do 3200 steps /rotation
For timing belt drive about 78 steps/mm

Wally has 10mm X-Y pulley so 31.4mm circumference
It is impossible to get 400mm/rotation of X-Y pulley

But maybe I should use with Wally --- X-Y pulley 3200/31.4 = 101 steps/mm

confused

:?:
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