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Messages - Tweakie.CNC

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341
Hi GréG,

You have to bear with me here because I am better at doing things than I am at explaining them but…

CV = Constant Velocity.

You can have a Gcode file containing many G1********* commands on many lines of Gcode which will be performed as one seamless operation within the rules of your Mach4 Constant Velocity settings. If you then insert an M3 or M5 command within those lines of Gcode the CV chain will be broken and a delay will be introduced. This delay may not be that noticeable with conventional machining but it will be noticed when using a laser.
For this reason the M62/M63 commands were introduced within Mach4 so they can be inserted into the Gcode and the file will run without breaking the CV chain. As mentioned previously I do not know about the latest Mach4 build (I haven’t tried it) but previously the S### command also broke the CV chain and that is what you are seeing in your excessive burn marks – the delay it introduces is noticeable.
It is only within the last couple of months that the Pokeys Mach4 plugin has supported the use of the M62/M63 command set so you will need to be using their latest build of the plugin and also the latest Mach4 build.

Quote
Here is my problem and the question: how to vary the laser power with pwm and M62 / M63 during machining?

If you want reliable laser operation then my best suggestion is to do as I have done and incorporate a simple circuit to gate the PWM signal with the M62/M63 signal, as I explained earlier.

Tweakie.

342
Hi GréG

There have been a number of recent developments within Mach4 to enable better laser handling but I am still not certain if controlling laser switching using the S### word can be done without breaking the CV chain (and causing delays). You would need to install the latest Mach4 build and see if this function has yet been implemented.
If it has not then…
It requires a bit of work but you need to ‘gate’ the PWM signal (pulse width set with the S### word) with the M62/M63 signal. This post (and linked posts) refer to the solution which I currently use. https://www.machsupport.com/forum/index.php?topic=12444.msg265104#msg265104
The laser is enabled with the M03 command but the actual switching is always done with the M63/M63.
If you require a change to the S### word then this is done during the period when the laser is switched OFF (by the M63Px command) then there will be no excessive burn and the laser can, for example, be switched between cut and engrave power levels without issue.  Although this was done at a time before the M62/M63 command were implemented (I used my A axis direction signal) this video demonstrate the principle of laser power control. https://www.youtube.com/watch?v=8fUg6ebWut0&ab_channel=PaulMott

Hope this helps.

Tweakie.

343
You should be using the dedicated laser switching commands M62Px / M63Px (where x is the Output# controlling the laser) to switch your laser ON/OFF as these commands allow switching without any delays. The S### command (and M03 / M05) unfortunately breaks the CV chain and causes a delay which will create excessive and unwanted burn marks in the work.

Some of the postings in this thread refer to the issue;   https://www.machsupport.com/forum/index.php?topic=12444.msg280664#msg280664

Tweakie.

344
General Mach Discussion / Re: laser power control
« on: November 20, 2021, 02:52:51 AM »
Hi John,

As mentioned in my previous post – you need the PWM on one pin and the switching signal (M11/M10) on another pin. The PWM is variable by the S### word and turned on by the M3 command.
In operation the PWM is turned ON and left running. It is then applied to your laser TTL input by the gated PWM/M11/M10 signal so you need to construct a small circuit (as I described in my previous post) to achieve this. At the end of the job the PWM is turned OFF by the M5 command.

Tweakie

345
*****VIDEOS***** / MOVED: Find No XHC NcUsbPod!
« on: November 17, 2021, 12:52:46 AM »

346
Sounds interesting, can we have more details please?.

Tweakie.

347
General Mach Discussion / Re: z axis depth increasing with every cut
« on: November 16, 2021, 12:36:26 AM »
Excellent news  ;)

Tweakie.

348
Quote
AXBB-E - this board but dont have a PWM - 0-10V, or i cant found in specifies.

There is perhaps too much to read...
On the AXBB-E plugin page in Mach3 you can attach the analog output channel to the spindle PWM. Then you have the 0 - 10V.  Simple really.

Tweakie.


349
Before you buy please note that because of their Mach3 license violation Novusun products are not supported by this forum.  https://www.machsupport.com/forum/index.php?topic=24331.0

The AXBB-E would be a good choice  ;)  (good product with full manufacturer's support).

Tweakie.

350
Welcome morrissel311  ;)

Tweakie.

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