First Cut

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samng
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Joined: Wed Mar 26, 2014 6:51 am

First Cut

Post by samng » Wed Mar 26, 2014 4:19 pm

hi,

I just encountered a first cut problem. I used CAMBAM to generate g-code The first two tasks (profile1 and profile2) were done perfectly but the final task (profile3) was out of control and cut in a mess. I attached three images here, I don't know what wrong is, Can anyone give me a hand?
Attachments
03_s.jpg
03_s.jpg (111.52 KiB) Viewed 1318 times
02_s.jpg
02_s.jpg (86.68 KiB) Viewed 1318 times
01_s.jpg
01_s.jpg (46.5 KiB) Viewed 1318 times

twforeman
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Re: First Cut

Post by twforeman » Wed Mar 26, 2014 4:36 pm

Could be any number of things.

- overheating drivers - do you have a fan on the board?
- bit slipping in the chuck?
- cork moving around during the cut? how was it fastened down?
- slipping pulleys?
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danimal
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Re: First Cut

Post by danimal » Wed Mar 26, 2014 4:37 pm

To me that looks like your steppershield is overheating. I would recommend getting a fan and or heatsinks and tune your currents for your motors to minimize heating. I think that there is a wiki for adjusting motor currents. That seems to be the hardest part in the beginning. Really getting a good amount of airflow across the controller is the best thing, and if you add some heat sinks I doubt that you will have any more problems.
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edwardrford
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Re: First Cut

Post by edwardrford » Wed Mar 26, 2014 5:17 pm

Hi Samng,

Looks like you're getting close. I concur with both danimal's and twforeman's suggestions.

As a side ntoe: Please do not intentionally post the same topic in two places. It makes helping you more difficult and (as shown by the near identical answers) creates redundant work for fellow forum members.

your two identical posts have been merged into one. The merged topic has been moved into the correct forum.

Carry on.

-Edward
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WillAdams
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Re: First Cut

Post by WillAdams » Wed Mar 26, 2014 5:25 pm

danimal wrote:I think that there is a wiki for adjusting motor currents. That seems to be the hardest part in the beginning. Really getting a good amount of airflow across the controller is the best thing, and if you add some heat sinks I doubt that you will have any more problems.
Correct. We have some information here: http://www.shapeoko.com/wiki/index.php/ ... or_Current

and that has a link to the official: http://www.synthetos.com/wiki/index.php ... or_Current

(but please read the ShapeOko wiki first --- there's an important caveat there)

Agree that adding a fan (and/or heat sinks) is a worthwhile thing to do.
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samng
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Re: First Cut

Post by samng » Wed Mar 26, 2014 5:29 pm

I have no fan to cool the board.

The problem I observed is that When the spindle is cutting the big circle, it would suddenly stopped for a while and recovered to cut afterward. So, it would miss several lines of g-code and the result became mess.

The cord was mounted firmly on the cutting platform so the third point can be ignored.

twforeman
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Re: First Cut

Post by twforeman » Wed Mar 26, 2014 5:46 pm

If you have no fan, and the machine is stopping and starting, then you are most likely having thermal shutdown issues.

Get some cooling on the driver board.
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Schruminator
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Re: First Cut

Post by Schruminator » Wed Mar 26, 2014 9:10 pm

This could be due to excessively long lines of gcode, although I would have though the eyes and smile would have also caused an issue.

Regardless, it'd be useful to make sure your lines are limited to 50-70 characters depending on what you're using. Som epoking around the forum about long gcode lines should stir up some more specifics on this one (some of the gcode senders have an option to automatically trim the long lines).
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selektha
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Re: First Cut

Post by selektha » Mon Mar 31, 2014 6:19 am

Looks like my old problem with unshielded wires, bought high quality shielded wires and my problems where solved.

The motors and rotary tools(like dremels) generate a huge amount of EMF that can create erratic behavior.

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