[maki]

I am working with wire cutting cnc (GMFC) for abouth 18 years, and it is a dxf wersion sensitiwe. There is werry wisible diference hov manny points is implemented in a single curve becaue software doesn't make interpolation between points if is an object not an airfoil.

[tantemay]

It's not the DXF. The GCode consists only of a G2 instruction which you cannot enter via MDI.
I have the aperture settings at 0.00125 and 50 °

[PlanetCNC]

There is a lot of confusion about blend.
Here is some math.

Imagine two line segments, such that direction only slightly changes. For example:
G00 X0 Y0
G01 X100
G01 X200 Y1
Almost straight line :-)
Now imagine machine moving on this "straignt" toolpath with constant velocity. Lets say F1000.
Calculate forces acting on machine at position X100 Y0.
Why is calculated result different from what is observed on real machine? What exactly happens on real machine and what can we do about it?

Edit: this is off topic because it is not about facets.

[tantemay]

I can't answer the questions you ask.
I only know that changing the parameters in Blend was the only one that improved the milling pattern.

I can rule out mechanical problems.
Because a friend of mine has the same machine.
He doesn't have these facets.
It only has a different control. (EdingCNC).

So there is a suspicion that it is due to the control or the settings. But there I get nowhere information that takes me further.

[PlanetCNC]

@tantemay
Send me your profile and g-code that makes facets.

[tantemay]

Here are the files in the .zip

[tantemay]

Interpolation?
Can TNGv2 only drive straight?

The length of the degrees it then moves depends on the interpolation time constant and the feed.

If you have now set the standard value of 0.01s, this means that at 5000mm / min feed only sets a new way point every 0.8333mm (5000mm / min / 60 = 83.33mm / s x 0.01s = 0.833).

This means that facets with a length of 0.83mm are created on a circle that is driven at 5000mm / min.

It's just a thought from me. Maybe I am wrong.

[PlanetCNC]

TNG can drive curves.

How fast did you cut this file? G-code says F1000.
Did you measure facet length?

[tantemay]

I milled it as in the code.
But also with different speeds and different feeds.
I also varied the step resolutions.
Basically, the surface remains the same.
In the case of curves, the facet length changes depending on how far the facet is from the apex of the curve.

After a closer look, it doesn't matter whether you have activated Bend or not

[PlanetCNC]

I noticed something in your settings which is probably totally unrelated.
1. Go to Settings/Motors/Backlash
2. Set value other than 0 so that "Backlash" options become enabled
3. Make sure "Backlash" is set to "Disable"
4. Confirm settings.
5. Restart TNG.
6. Go to Settings/Motors/Backlash and set it back to zero.

For some reason your backlash was enabled. Like I said - probably totally unrelated.

[PlanetCNC]

I tested and that "backlash" has nothing to do with your problem.
I made a "plot" of actual coordinates at high resolution and no facets are visible. I can send it to your email. It is too big for here.

[tantemay]

Today I was able to make the first improvements.
I had set the driver's DIP switch for the X axis differently than that for the Y axis.
Exactly it was SW 5. Is used for setting the active edge of the input signal, “off” -means the active edge is the rising edge, while “on” is the falling edge.
Now everyone is set to falling edge.
The surface is not yet optimal. But that's how I can live with it.

Backlash is set to Disable.