Newbie looking at 6040 (China CNC) for polypropylene 15mm sheet

**JOGARA** · 25-04-2017

removed......

**JOGARA** · 25-04-2017

So it looks like heavy mist/flood works really well.

The finish quality is really good too.

Having some odd problem where the Gcode is saying helical down, but Mach3 isn't doing it. It is still running the rest of the code as it should be but ignores Z.

**Zeeflyboy** · 25-04-2017

It's only just started doing it?

Does the axis travel in mach (i.e. is the Z travelling in the mach "DRO" for the Z axis?). Sure you haven't accidentally picked the wrong post processor?

Does the simulation in fusion work as expected? Quite possible you accidentally set the depth to a top contour if not.

**JOGARA** · 25-04-2017

It worked fine when I did the simple 2D plate of 5mm.
So physically I know the spindle can go down further.

Does the axis travel in mach (i.e. is the Z travelling in the mach "DRO" for the Z axis?).

No idea what that is. Will look into it.

Using the stock Mach3 from Fusion.

Simulator works fine. Even goes down the -2mm I set off the bottom of the stock.

The Gcode says the Z to go further,

**Boyan Silyavski** · 26-04-2017

you need more like 22000rpm and 3000mm/min with 3 flute roughing bit at 3mm depth of cut. heavily cooled by air at least. But that are speeds and feeds for very rigid machine or a mill

0.07mm feed per tooth on aluminum? i dont think so, especially on your machine. Lower the depth of cut and look to eliminate any chatter. Or lower feed per tooth to 0.3 lowering your feed speed half.

Just make a video to hear whats going on and we will tell you whats wrong...

**JOGARA** · 26-04-2017

Originally Posted by Boyan Silyavski

you need more like 22000rpm and 3000mm/min with 3 flute roughing bit at 3mm depth of cut. heavily cooled by air at least. But that are speeds and feeds for very rigid machine or a mill

0.07mm feed per tooth on aluminum? i dont think so, especially on your machine. Lower the depth of cut and look to eliminate any chatter. Or lower feed per tooth to 0.3 lowering your feed speed half.

Just make a video to hear whats going on and we will tell you whats wrong...

This is what I am currently using under heavy mist and it works quite well.
2mm DoC

This is the surface finish.