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Author Topic: Adjustment of measures
soko
Newbie
Posts: 9
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Post Adjustment of measures
on: November 29, 2017, 23:26
Quote

Hello,

First of all congratulate the creators of this great project πŸ˜€ and forgive me for my low level of English.

I have finished my machine, and now I work with the software.

I use arduino one and a cnc shield, with the latest version of polargraph.

My pulley is 82 mm / rev, I use two steppers of 200 p / rev, the driver is at 4 micropasses.

The problem is that when I move the machine or draw something, the movements of the machine are much greater than the ones I have sent in the controller and it always leaves the margins.

I have tried to scale the measures of the machine, change micropasses, and other parameters but nothing fits the real measurements 😑

Attached configuration, if any can help me. Thank you very much!!!
Image

kongorilla
Pro
Posts: 341
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kongorilla
Post Re: Adjustment of measures
on: November 30, 2017, 05:16
Quote

In the attached image, you have steps per rev at 400, rather than 200.

sandy
Administrator
Posts: 1254
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sandy
Post Re: Adjustment of measures
on: November 30, 2017, 20:31
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Good spot Kong!

soko
Newbie
Posts: 9
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Post Re: Adjustment of measures
on: November 30, 2017, 20:52
Quote

Hi, thank you very much for the answers.

Indeed, I have tried with the value 200, 100, 50 and also of 800 and 1600. But I do not find values ​​for correct movements.

In the firmware there is a line that is:

int startLengthMM = 800;

What exactly indicates that measure?

Thanks !!!

soko
Newbie
Posts: 9
Permalink
Post Re: Adjustment of measures
on: November 30, 2017, 22:27
Quote

I can solve my problem!!!!! πŸ˜€

I dont update correctly machine dimensions in the firmware, I only update in the software.

Thanks and great software!!!

sandy
Administrator
Posts: 1254
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sandy
Post Re: Adjustment of measures
on: November 30, 2017, 22:30
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Just what I was going to suggest πŸ™‚

soko
Newbie
Posts: 9
Permalink
Post Re: Adjustment of measures
on: December 5, 2017, 23:06
Quote

Quote from soko on November 30, 2017, 20:52

Hi, thank you very much for the answers.

Indeed, I have tried with the value 200, 100, 50 and also of 800 and 1600. But I do not find values ​​for correct movements.

In the firmware there is a line that is:

int startLengthMM = 800;

What exactly indicates that measure?

Thanks !!!

Can someone help me with this?

sandy
Administrator
Posts: 1254
Permalink
sandy
Post Re: Adjustment of measures
on: December 5, 2017, 23:19
Quote

It's the length that the machine believes the cords to be upon startup. Until you do a "set home", it will assume the cords are 800mm long.

It's a default and doesn't actually make much sense - it's quite arbitrary.

Sn

soko
Newbie
Posts: 9
Permalink
Post Re: Adjustment of measures
on: December 9, 2017, 21:40
Quote

OK, thanks.

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