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Messages - Tweakie.CNC

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4301
General Mach Discussion / Re: laser pulsing instead of cutting a solid line
« on: September 22, 2012, 11:58:57 AM »
Hi Andre,

Perhaps some more details of exactly how you have your laser connected and configured in Mach3 would be helpful.

Tweakie.

4302
FAQs / Re: Axes position at start up
« on: September 22, 2012, 07:05:41 AM »
On the General Config page, uncheck the 'Axis DRO Properties' boxes then Mach3 always starts up with DRO's at 0.0000

Tweakie.

4303
Hi Ronny,

Connect the 3 motor wires to the 3 output terminals of your VFD.
If the motor runs backwards when it should run forwards just swap any two motor wires you have connected to the VFD terminals.

Tweakie.

4304
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: September 21, 2012, 10:32:16 AM »
My new tube has just arrived from China, been plumbed in and the water circulation system run for some 2 hours (to remove all the air bubbles) now to test it out.

Tweakie.

4305
Italian / Re: TANGENTIAL setting problem
« on: September 20, 2012, 12:50:17 PM »
Ciao Sebastian,

Si prega di tenere conto per il mio uso di Google Translate.

Quando cerchi di taglio si consiglia di creare un lead-in e lead-out (nel software CAD / CAM) con lo stesso raggio del cerchio da tagliare. In questo modo il taglio è orientato nella direzione corretta prima che entri nel lavoro.
Rettangoli funziona correttamente - si tratta solo di un problema di Mach3 ha con cerchi.

Tweakie.

4306
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: September 20, 2012, 06:24:46 AM »
As always Jeff, excellent results.

I am pleased you are now using PicEngrave - John has put a lot of work into writing his software and results like this, I am sure, will make it all worthwhile.

Tweakie.

4307
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: September 19, 2012, 11:34:53 AM »
Based on the excellent results Jeff (JJWMACHINECO) has achieved with burning ‘shades of grey’ into wood…

There are those that have converted imported CO2 laser machines to operate with Mach3 who do not actually have a motorized Z Axis and others who perhaps do not wish to add an encoder to their existing Z Axis. For this scenario I submit the following design idea which is primarily aimed at CO2 lasers with 40 Watts (or more) available output power.

Because the Mach3 internal PWM generator cannot easily be controlled ‘on the fly’ with the S*** commands blended with X Axis movement, or at least not fast enough to be useful, another approach has been considered.

It is perfectly feasible to construct a ‘stand alone - step / direction’ controlled PWM generator the output of which is easily converted to a voltage with a simple DAC (digital to analogue converter). Then by using 2 voltage dividers, one to set the lower voltage at which the wood is just marked and the other to set the higher voltage at which the maximum burn is achieved the laser output power can be fully controlled (via its PSU), with 8 bit resolution, from a lithophane type GCode tool-path.

I threw out the initial idea of connecting an encoder to a stepper motor and then using a standard stepper motor driver in favour of an all electronic solution which will enable ‘on the fly’ adjustment of the minimum and maximum thresholds whilst still maintaining an 8 bit resolution of  voltage over a typical 2mm depth of tool-path.

My design may well be a bit theoretical at this stage but so far I have established that a PIC microprocessor, clocked at 20MHz, can be configured within Mach3 as an Axis which can then be driven at a typical feed-rate of 1000mm/min with 127.5 steps/mm and produce a continuously updated PWM output between 0 and 100%.
Referring to my very basic schematic, this PWM is then opto-isolated, to remove the GND constraint and place the 255 step output potential between the maximum and minimum voltage settings of the two potential dividers. A simple DAC is then used to drive the emitter-follower output voltage to the laser PSU.

For the initial testing and for convenience, I am using a partially populated pcb from my RF Laser controller design (mentioned many posts back) purely because the display is useful, at the software design stage, to be able to observe the various settings and values. The final design will be a lot less complicated.

As always, early days yet but it all looks promising.

Tweakie.

4308
Hi Sweep,

Obviously not all parallel ports are produced to the same specification but the maximum value that can safely be drawn from any one pin should be considered as not to exceed 10mA (the port is primarily designed to sink current rather than source it).

Just as a tip, it would be far better to use a USB port for the source of the 5 Volts supply in your circuit (or else use a separate 5 Volt supply).

Tweakie.

4309
Hi Ansen,

Welcome to the forum.

I find your photography method most interesting and the results are indeed quite spectacular.
I look forward to seeing some of your innovative CNC work.

Tweakie.

4310
General Mach Discussion / Re: Awesome Cowboy Welcome Sign DXF File
« on: September 14, 2012, 04:27:26 AM »
Thanks Jason, it is most kind of you to share some of your beautiful work.

Tweakie.

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