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Messages - Tweakie.CNC

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4411
General Mach Discussion / Re: Climbing Z axis
« on: July 17, 2012, 12:40:30 PM »
Hi Al,

Reduce the current setting for that motor. It should be warm to the touch, during operation, but not as hot as you have described.

Tweakie.

4412
General Mach Discussion / Re: Climbing Z axis
« on: July 17, 2012, 11:18:28 AM »
Hi Al,

Just out of curiosity, how hot is your motor getting ??

Tweakie.

4413
General Mach Discussion / Re: Engraver Conversion
« on: July 17, 2012, 06:58:02 AM »
Hi Bobby,

No, don’t use the 2.5D

Under Config / Ports & Pins / Spindle setup, specify an Output # for M3 (1 would be good). Then under Output Signals for Output #1 specify the port and pin you will be using to drive your pen up / down.
Then the GCode M3 / M5 will activate / deactivate this pin accordingly.

If it is any help, you can e-mail me or post here a sample copy of the code you are planning to use and I will check out the compatibility etc.

Tweakie.

4414
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: July 17, 2012, 04:15:24 AM »
Something I have perhaps only briefly mentioned in earlier posts is the advantage, even the necessity, of Air assist.

When laser cutting wood, for example, carbon is produced and if this occupies the bottom of the kerf it will reduce penetration considerably. Air assist, if correctly orientated, will remove these carbon particles from the kerf as they are produced and cutting efficiency is much improved as a result. Although wood is perhaps the best example, many other materials will exhibit similar properties and the end product will almost certainly benefit from the use of air assist.

If the air is applied co-axial to the laser beam, for example – the air is fed into the side of the lens assembly and then exits through the same (small diameter) nozzle as the beam, this has the added advantage of preventing vapours or particles from the work piece being deposited onto the surface of the focus lens thus extending the life of the lens and reducing the necessity of frequent cleaning of this component. The disadvantage is that a clean, dry and oil-less air supply is required. The Koi pond aerator type pumps are pretty well suited to this task, they are available in various sizes and air flow rates and are not expensive to buy. These are relatively quiet in operation and are probably the most commonly used type for small laser machines. Shop air could also be used, providing the necessary traps / filters (similar to those used for vehicle spray work) are included in the line together with suitable pressure regulation but with a compressor there is always the potential risk of oil contamination of the lens if the filters are not changed regularly.

For cutting thin materials (veneers, gaskets and the like) a relatively low air pressure / flow rate is all that is necessary – too high a pressure can result in the cut parts or waste material being blown around on the cutting bed and causing problems. For this type of work I use a small Koi pond pump and also have an air-bleed valve in the line so that I can reduce pressure / flow rate if necessary. For the thicker materials I use an old twin cylinder Gast Roc-R pump and between these two different pumps manage to cover most eventualities.

Tweakie.

4415
General Mach Discussion / Re: Engraver Conversion
« on: July 17, 2012, 01:26:16 AM »
Hi Bobby,

You can control the pen down / pen up function quite easily by using the M3 / M5 commands within your GCode.
These commands can be mapped to an available output pin and used to control your relay in exactly the same way as a spindle on / off control.

Tweakie.

4416
General Mach Discussion / Re: tangential knife rotation problem
« on: July 16, 2012, 02:05:36 AM »
Hi ET,

I am pleased that you have got it sorted.

Tweakie.

4417
General Mach Discussion / Re: tangential knife rotation problem
« on: July 16, 2012, 01:00:33 AM »
 ;D

Tweakie.

4418
General Mach Discussion / Re: tangential knife rotation problem
« on: July 15, 2012, 11:49:35 AM »
Hi ET,

No, it will not affect the X Axis - it just changes the direction of rotation of the A Axis stepper motor.

Tweakie.

4419
General Mach Discussion / Re: tangential knife rotation problem
« on: July 15, 2012, 07:14:46 AM »
Hi ET,

Try changing the 'Dir LowActive' state in Config / Ports & Pins / Motor Outputs for your A Axis.

Tweakie.

4420
FAQs / Re: Cant get tool settings on mach3 to work... NEWBIE :)
« on: July 15, 2012, 04:06:45 AM »
Hi Rune,

There are different ways of handling the cutter radius compensation.
You can produce an 'on the line' type of toolpath then include the G41/G42 commands into your GCode to apply the offsets set up in your tool table etc (see the Mach3 manual for full details).

Personally I prefer to include the cutter radius compensation into the generated GCode (exactly what your Phlatscrip appears to have done).
Just changing the tool size within Mach3 will not have any effect on the actual toolpath if you are using this method.
If you post a question on the Phlatforum the guys there will will tell you how to set your tool diameter within the Phlatscript/Sketchup GCode generation.

Tweakie.

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