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Messages - Tweakie.CNC

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6111
General Mach Discussion / Re: Breakout Board
« on: February 25, 2012, 02:52:19 AM »
Although not identical to the one you mentioned CNC4PC do a good range of breakout boards so you should be able to select a comparable replacement. http://www.cnc4pc.com/Store/osc/index.php?cPath=33&osCsid=074e2c480e07efcff985cce3938884a5

Tweakie.

6112
General Mach Discussion / Re: Previous Versions
« on: February 23, 2012, 10:18:17 AM »
Hi John,

No idea what can be causing the problem - I have not had that error here (yet  :) )

Tweakie.

6113
General Mach Discussion / Re: LC Not Saving Files
« on: February 23, 2012, 07:39:41 AM »
Hi Pendragon,

Using LC is a bit like driving a vintage auto-mobile you have to learn it's peculiar little ways.

Rich's manual may help you   http://www.machsupport.com/forum/index.php/topic,12078.0.html

Tweakie.

6114
General Mach Discussion / Re: Gcode more than 100,000 lines
« on: February 23, 2012, 07:31:37 AM »
Dave,

The M30 would make G0 moves so check your motor tuning because you probably have the Velocity / Acceleration set far too high.

Tweakie.

6115
General Mach Discussion / Re: Previous Versions
« on: February 23, 2012, 04:56:02 AM »
Hi John,

I have uploaded v056, which I am using, here http://www.graytel.talktalk.net/Mach3(056).zip

It will only be there for a few days before it is deleted but should give you enough time to get it  ;)

Tweakie.

6116
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 22, 2012, 06:08:47 AM »
Hi Dan,

OK, I submitt. You know best  ;D

Tweakie.

6117
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 22, 2012, 05:19:16 AM »
Quote
And to be more correct, I think that the laser never really does several pulses on top of one another (well if it's focused fine enough that is), as the axis is in a constant move. I think the correct way of thinking about it is the dots intensity. And the other thing to consider while at it is that the exposure time is determined by the axis feed rate.

Hi Dan,

You can do the maths – when the laser is pulsing at twenty thousand dots per second with a line scan speed of just four hundred pixels per second, there can indeed be many dots on top of one another. If it was not for this fact, the plugin would not, I think, be able to produce any shades of grey.  ;D

Tweakie.

6118
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 22, 2012, 04:29:43 AM »
Well, I think the plugin doesn't control the laser power whatsoever. All it does is trigger it on and off.

Dan


Hi Dan,

In a way you are right – the plugin does indeed just switch the laser on and off but it does in a cunning way called modulation. As laser ‘burn’ is related to both laser power and exposure time when the plugin switches the laser on it does it in pulses or dots per pixel – a few pulses on top of one another produces a light mark and many pulses on top of one another produces a dark mark. You have seen from Art’s description that these pulses or dots are pretty quick and providing the step-over has been set correctly they will blend and this in turn produces the shades of grey. I have tried to describe the process in my PDF http://www.cooperman.talktalk.net/Engraving.pdf which I am sure you have probably read already.

Overall, the function is not dissimilar to a PWM spindle speed controller – it only turns the spindle on and off at full power but by varying the duty cycle it controls the speed. There are a few more refinements in a speed controller such as measuring the back EMF and adjusting the pulse width so that a constant speed can be maintained under varying tool loading but basically all it does is turn the spindle on and off.

Tweakie.


6119
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 20, 2012, 12:22:00 PM »
Hi Dan,

I think you have got me there, because I just don't know the answer.

On it's own, the plugin will not always smooth a gradient of tone without producing 'steps' as can be seen in the background of this image which is a smooth transition from light to dark. I have spoken with Art about this and he feels that the cause is mathematical in nature.



Once an image has been 'halftoned' this does not happen, the gradient is much smoother.

As for why ? hopefully I will eventually discover the reason but for the moment it illudes me.

Tweakie.

6120
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: February 20, 2012, 11:14:18 AM »
Hi Dan,

A very good question (you always ask good questions) – as far as I can tell, yes the dots are all the same size so this would indicate that the laser has been fired at exactly the same power level throughout the whole image. The thing that varies is the dot density and this is the clever part which gives the illusion of shade.
In some areas of the image the dots actually merge because the burn marks on the wood are larger in diameter than the laser spot that created them. So, in theory, if I could increase my axis speed and reduce the burn time of each dot they would be smaller in diameter and I could increase my resolution. But, as said before, everything is a compromise.  :'(

Tweakie.

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