Extruder works now it only wants to amke HUGE parts

Well if it isn't one thing it is another. Now when I send a part to the machine that is about a 2 inch in diameter circular part it draws an oblong part all across the entire platform. I thought I had axes switched but nope all are where they should be. It's like it is building in metric on one axis and inches on the other. The z stage is fine. So wierd. Any thoughts?

Also how many opto endstops should I have? I have 2 for each axis but only 1 hooked up on each.

The steps per millimeter (and steps per inch) is settable independently. You probably just need to recompile your firmware with the correct numbers. You did edit the .h file?

Endstops are 1 per axis for zero positioning. It was originally designed for more, but last I heard there aren't enough pins on the processor to properly use them all.

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I'm building it with Baling Wire

Have a look at this part in the Configuration.h


#define X_STEPS_PER_MM 10.047
#define X_STEPS_PER_INCH (X_STEPS_PER_MM*INCHES_TO_MM) // *RO
#define INVERT_X_DIR 0

#define Y_STEPS_PER_MM 10.047
#define Y_STEPS_PER_INCH (Y_STEPS_PER_MM*INCHES_TO_MM) // *RO
#define INVERT_Y_DIR 0

#define Z_STEPS_PER_MM 833.398
#define Z_STEPS_PER_INCH (Z_STEPS_PER_MM*INCHES_TO_MM) // *RO
#define INVERT_Z_DIR 0

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Mfg
Wolfgang

Aller Anfang war schwer - Wolfstrap

Reprap-fab.org

Erfahrungen kann man leider schlecht weiter geben, die muss man selber machen.

jgilmore Wrote:
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> The steps per millimeter (and steps per inch) is
> settable independently. You probably just need to
> recompile your firmware with the correct numbers.
> You did edit the .h file?
>
> Endstops are 1 per axis for zero positioning. It
> was originally designed for more, but last I heard
> there aren't enough pins on the processor to
> properly use them all.


Ok I have one opto per axis. Which .h file?

Wolfgang I will check that as well, isn't that how you dial inyour accuracy depending on your machines gearing? When I had the old firmware installed it would traceout this part no problem and those parameters were set that same as they are now.

> isn't that how you dial inyour accuracy depending on your machines gearing?

yes it is !



did your Stepper not run in one direktion ? (too fast ?)

normaly i make a square (10mmx10mm) and look what the machine makes from it.

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Mfg
Wolfgang

Aller Anfang war schwer - Wolfstrap

Reprap-fab.org

Erfahrungen kann man leider schlecht weiter geben, die muss man selber machen.

The machine moves fine it is just building everything HUGE. I know it sounds like a simple inches to metric conversion but where? Everything is set to metric and the STL is metric. The STL loads in the host software in the right scale but looks like it is printing inches....I have to be missing a conversion somewhere.....

look in your G-Code is there this ?


G21 (Millimetres as units Implemented.)

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Mfg
Wolfgang

Aller Anfang war schwer - Wolfstrap

Reprap-fab.org

Erfahrungen kann man leider schlecht weiter geben, die muss man selber machen.

> Endstops are 1 per axis for zero positioning. It was originally designed for more, but last I heard there aren't enough pins on the processor to properly use them all.

There are enough pins, even on a standard Arduino, for a standard RepRap. You only have one extra pin, so if you want to add something else, like a heated bed or extruder encoder you will have to cannibalize the max sensors. I don't use the max sensors because they get knocked out of alignment more often than they activate (because I almost never move that far.)

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Darwin clone, Gen 2 electronics, Arduino Duemilanove w/ AtMega328, 5D Firmware, Pinchwheel extruder
[www.codeerrors.com]

Curlrup, try measuring the difference between the commanded and actual moves, and the ratio might give you a clue. It could be that one of your stepper drivers is set to microstepping mode if it's 1/2, 1/4, 1/8 or 1/16 exactly.

Wade Wrote:
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> Curlrup, try measuring the difference between the
> commanded and actual moves, and the ratio might
> give you a clue. It could be that one of your
> stepper drivers is set to microstepping mode if
> it's 1/2, 1/4, 1/8 or 1/16 exactly.


It's funny I jog the machine 10 mm in each axis and it jogs very close to 10 mm, I send an STL file to it and it prints like it is printing something huge. It even overshoots when it homes itself before a print. If I get a build going with the motors off and turn them on after the home command it is making huge moves. It's crazy.

By default the home command should move all the way to the endstops, no matter where the head is in the machine. Perhaps you could attach the gcode file to this post, and I'll see if it looks ok. What firware version and host version are you running? Attach the Stl as well, sometimes they have odd offsets.

Wade

The funny thing is even though it is building huge parts when it homes and triggers the Optos it keeps right on going. If I home it in the control panel on the host it stops. I will get all my versions and G Code here soon. Thanks

Curly


Wade Wrote:
-------------------------------------------------------
> By default the home command should move all the
> way to the endstops, no matter where the head is
> in the machine. Perhaps you could attach the
> gcode file to this post, and I'll see if it looks
> ok. What firware version and host version are you
> running? Attach the Stl as well, sometimes they
> have odd offsets.
>
> Wade

Hi,
if you are using the Reprap Host software, put the part (klick right on it) a little in the mittle of the Table..
The way to the Homeposition at the beginning of a layer is normal.

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Mfg
Wolfgang

Aller Anfang war schwer - Wolfstrap

Reprap-fab.org

Erfahrungen kann man leider schlecht weiter geben, die muss man selber machen.

Well I tried a diffrent STL file and it works great! I think that SYL was bad, very very possible. New problem.......I know will it ever end. This is a little more cryptic It stops after two layers and gives me this error message


Productionexception:java.lang.ArrayIndexOutOfBoundsException: -1


?????

What is out of bounds?

It is tracing the file perfectly. It homes and starts printing. Very strange. Any thoughts? Thanks for all of the help folks I am soooo close to printing something.

Curly

array index out of bounds exception means something is asking for item number 5 (index) from a list (array) of 3 items or something like that.

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Wooden Mendel
Teacup Firmware

Normally,
when you look at the complete stack trace, of the thrown exception,
you can also see the class and line-number of source-code where the exception occurred. It helps tremendously when debugging the original source-code.
Hope this helps.
Cheers.
Marius Botha
Pretoria, South Africa
[mariushermanbotha.wordpress.com]

Yep none of that helps me at all. Sorry folks but when it comes to java and programing I am a complete novice, I know little to nothing. I know more than most but what Triffid and Ballance posted went right over my head.

OK I got everything rolling again. I even got Skeinforge, and Repilcator G rolling so now I just have to get that extruder stepper gear to stop slipping and I am good to go. The gear I put on the shaft to grip the filament keeps workinig loose. That is an easy fix I know how to do. I soon will be posting first prints!