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Author Topic: aspect ratio...
giorgiodid-
on
Newbie
Posts: 12
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Post aspect ratio...
on: January 18, 2012, 20:04
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hi all! finally the polargraph seems working well, the only issue i cannot understand is that the printing area is stretched: vertical size is shorter than the image loaded...
any idea?
thank you
giorgio

PS sandy i will place an orther for some spare parts direct from paypal ok? (i need 2 stepper motor, 2 Sprockets, 2 Beaded cord 3mt each)
kongorilla
Pro
Posts: 362
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kongorilla
Post Re: aspect ratio...
on: January 18, 2012, 21:11
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Did you set these parameters correctly, and upload them to your machine?

machine.motors.stepsPerRev: This is how many steps your motors have per revolution. Well, it's actually _double_ that, because I'm using an interleaved step style in the software - it creates kind of intermediate steps. My stepper motors have 400 steps per rev, so I enter 800.
machine.motors.mmPerRev: This is how much cord is extended per revolution. It is essentially the circumference of the sprockets, though with these beaded cords, it's actually the length of 8 bead sections.

If you're using beaded cord from Sandy, I think mmPerRev should be 95.
kongorilla
Pro
Posts: 362
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kongorilla
Post Re: aspect ratio...
on: January 18, 2012, 22:08
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Now that I've thought about the problem being only height, it occurs to me that maybe you aren't properly homing the gondola before starting the drawing. Or maybe you move the gondola by hand after homing, which wouldn't be good.
sandy
Administrator
Posts: 1317
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sandy
Post Re: aspect ratio...
on: January 18, 2012, 23:25
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Could be homing issue, but that would make the whole thing distorted too (tapered, or flared) too. Giorgiodidon, do you have a pic? Easier to diagnose that way.

Rory
Newbie
Posts: 1
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Post Re: aspect ratio...
on: February 6, 2012, 16:58
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Hello guys,

I'm having a similar issue.. I'm trying to draw a sample of shapes - circle/square/pentagon. But for some reason the drawings are always skewed and do not look at all like the shapes. I've tried this on a few of the pixel styles and always with the same results.

The overall shape is a semi circle at an angle but obviously filled in with the different pixel styles...(if that makes sense!) would you know why this would happen?

Also, I was wondering if perhaps you could give me a practice drawing to get started on, along with the different settings I should use, ie grid size/sample area + motor speed etc..?

I'm getting there through trial and error but it would be very handy to have a place to start so I know the settings are right and what the extreme highs and lows are.

thanks for all your help so far
sandy
Administrator
Posts: 1317
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sandy
Post Re: aspect ratio...
on: February 6, 2012, 23:00
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Hey Rory, probably a similar issue - do you have a picture? How you calibrate the machine and the software is completely dependent on your actual machine size - someone else's machine spec won't be any use to you.
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