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Messages - Tweakie.CNC

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6151
Mach SDK plugin questions and answers. / Re: Impact engraving plugin
« on: December 22, 2010, 04:09:45 AM »
Stitos,

Sorry my explanation was not very good, I will try again.

Quote
But the voltage and intensity of LPT1 is modified or not?

The voltage on the selected LPT1 pin (digital trigger) is, in my case, either 0V or 5V (off / on) It is pulsed for a duration of 40uS at a varying frequency which is dependent on the image depth and the axis feedrate.
This produces the equivalent to a variable duty cycle (similar in it's effect to 'Pulse Width Modulation') but it is essentially Pulse Repetition Frequency (PRF).

Hope this helps.

Tweakie.

6152
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: December 22, 2010, 02:35:23 AM »
Hi Josh,

The output from the plugin is a short duration pulse (40uS) it is the pulse repetition frequency that varies and this is in turn related to the feedrate. I am not sure this helps but the signal I am using to tell the laser how much power to put out is PRF.
I will be back on the project again in the new year but I am documenting the Synrad laser control here http://www.cooperman.talktalk.net/files/28.htm

Tweakie.

6153
Mach SDK plugin questions and answers. / Re: Impact engraving plugin
« on: December 22, 2010, 02:01:40 AM »
Andrea,

Excellent work, as always, on your completed impact engraving unit, extremely professional. (hope you sell lots  ;) )

Tweakie.

6154
Mach SDK plugin questions and answers. / Re: Impact engraving plugin
« on: December 22, 2010, 01:59:29 AM »
Stitos,

It is a short duration pulse (40uS for laser) but it is the pulse repetition frequency (0 to 100%) that varies. Obviously Art would be able to provide a better description but this is the type of signal that I see.

Tweakie.

6155
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: December 21, 2010, 11:15:40 AM »
Hi Josh,

As far as I know there are no manuals or guides but it is simple enough to use it is really just a matter of trial and error.

Output from the plugin is on the 'digital trigger' and this can be configured within Mach to any output pin# of your choice. The output power from the plugin is related to axis speed and it may take a while to get this just right but that's it really.

Good fortune with your project.

It would be really nice if you would start another thread with details and pictures of your project and the progress you make.

Tweakie.

6156
General Mach Discussion / Re: My mill started going backwards
« on: December 21, 2010, 07:56:02 AM »
Phase,

I agree with Hood - I think you have a problem with the driver recognition of the direction signal for your Y Axis. Perhaps a thorough check of your connections PC to BoB to Drivers etc may reveal the problem.

Tweakie.

6157
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: December 21, 2010, 07:37:01 AM »
I really should not do this because I have no permission to use this image which I came across on the internet but as it is just for my own testing and not for commercial or any other purpose I hope the artist will not mind too much.

This is a piece of 10mm acrylic, the reverse of which was sprayed black. The image was then laser etched into the paint/acrylic and then sprayed white. This is the result when viewed from the front. The next stage is, possibly, to laser engrave a foreground into the front of the acrylic - could have interesting results, perhaps.

Tweakie.

6158
FAQs / Re: Tutorials?
« on: December 20, 2010, 11:10:32 AM »
Talan,

Pleased to hear you are making progress.

The Z axis is usually set by touching the tool to the surface of the work then zero the Z Axis DRO. Initially I used a thin piece of paper to set this Z Zero but now have moved on to a Touch Plate and using the auto tool zero function.

Hope this helps.

Tweakie.

6159
FAQs / Re: Tutorials?
« on: December 20, 2010, 04:41:21 AM »
Hi Talan,

I am sorry you have not yet received an answer to your question.

I think that the best tutorial is probably 'hands-on' practical experience, provided you don't use your best cutting tool and you choose a soft material such as the hard model making foam you really can't do much harm and I am sure you will learn fast. Not sure why you should have that problem with Road Runner but you could try Sam's Wile E Coyote here http://www.machsupport.com/forum/index.php/topic,12140.0.html I have run this a few time without problem.

If you have any specific problems or issues please post them under the General section where they will get the most exposure.

Good luck.

Tweakie.

6160
General Mach Discussion / advice please
« on: December 18, 2010, 02:41:55 AM »
Mike,

Is your robot an 'arm' or 'linear flatbed' device ?.

Tweakie.

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