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gnea / grbl

An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino
https://github.com/gnea/grbl/wiki
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Spiral interpolation in XY axis #992

Open sergiv69 opened 3 years ago

sergiv69 commented 3 years ago

Hi, First of all apologizes if question was already done, I was not able to find it.

It seems like a dummy think but, I can not figure out how to draw spirals (like the snail shell) with X and Y axis. I can only find info on drawing arcs, but it is not an arc, I need spirals.

Is there any command to do this?

I want to do this: https://www.youtube.com/watch?v=7XvDAx_TWLg

SimonJohnCastle commented 3 years ago

To plot a spiral you simply plot radius x sin() against radius x cos() of the angle and vary the radius by the angle, if you truly want a snail shell then that follows the fibonacci series which is something else.

sergiv69 commented 3 years ago

Hi Simon,

Thank you very much for your answer. But how I can implement that on Gcode? I mean do I have to plot every point I wish with G01 commands, or with G02/03 commands and changing the radius, or there is any better method?

SimonJohnCastle commented 3 years ago

Unfortunately you will have to plot each point yourself. May be Inkscape, Gimp or one of the other graphics tools can draw spirals and you can start there. If you dont know where to start then I could add it as a tool path to my project here Conversational-Programming-CAD-Free-CNC

Link now works :-)

sergiv69 commented 3 years ago

Thanks. I can't open your link, says it was not found, could please re-attach it?

MARIOBASZ commented 3 years ago

I use bCNC to handle grbl. It has many plugins and from there I generate the figures and G code. You can generate a plugin to do that (spiral). I think that inside the Trochoidal 3 d plugin there is a spiral; I don't know if somewhere on my computer I have it as a separate plugin. While I am limited with Python, I have been able to make some input. Options: Maybe some Cad program has a spiral? Generate the points and the Gcode from excel?

SimonJohnCastle commented 3 years ago

Here is a 2 revolution spiral centered on 40,40 with increasing radius 20 by revolution.

In the interest of reducing the points you can draw regular arcs over small distances to get a good result

` G90 ; ABS

G0 X40.0 Y40.0 ; P1 Fast G1 Z0 F800 G91 ; REL G1 Z-1.8 ; DOWN G2 X0.8 Y1.4 R1.7 G2 X2.1 Y0.2 R3.3 G2 X2.1 Y-1.7 R5.0 G2 X0.8 Y-3.3 R6.7 G2 X-1.6 Y-3.9 R8.3 G2 X-4.2 Y-2.8 R10.0 G2 X-5.8 Y-0.1 R11.7 G2 X-5.7 Y3.4 R13.3 G2 X-3.5 Y6.7 R15.0 G2 X0.6 Y8.3 R16.7 G2 X5.3 Y7.5 R18.3 G2 X9.2 Y4.1 R20.0 G2 X10.8 Y-1.2 R21.7 G2 X9.4 Y-7.1 R23.3 G2 X4.8 Y-11.7 R25.0 G2 X-1.9 Y-13.3 R26.7 G2 X-8.9 Y-11.2 R28.3 G2 X-14.2 Y-5.5 R30.0 G2 X-15.8 Y2.6 R31.7 G2 X-13.0 Y10.8 R33.3 G2 X-6.1 Y16.7 R35.0 G2 X3.2 Y18.3 R36.7 G2 X12.6 Y14.9 R38.3 G2 X19.2 Y6.8 R40.0 G1 Z1.8 G0 Z5 ; UP G91 ; REL `

SimonJohnCastle commented 3 years ago

Here it is executing, each arc is 30 degrees

YouTube Another 4 More Faster

sergiv69 commented 3 years ago

Wow, that's impresive. Thank you very much!!!

SimonJohnCastle commented 3 years ago

I have added the spiral path to my conversational programming tool

Generating A Spiral Path

There are good reasons why you actually want to do it, as wall as the path being uninterupted

Running on CNC machine

sergiv69 commented 3 years ago

Hi,

Thank you very much! You are very kind.

I was also thinking about the interpolation of a rotary axis and a linear axis such as the example on this video, see from minute 1:07

https://youtu.be/atVbV22pYN8?t=67

It is incredible what they done! It could be possible to give the order with standard G01, G02, G03 instructions to do it?

Saludos cordiales / Best regards, Sergi Valls

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Missatge de SimonJohnCastle @.***> del dia dg., 21 de març 2021 a les 0:02:

I have added the spiral path to my conversational programming tool

Generating A Spiral Path https://youtu.be/nijRmX5RPwcl

There are good reasons why you actually want to do it, as wall as the path being uninterupted

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/gnea/grbl/issues/992#issuecomment-803475713, or unsubscribe https://github.com/notifications/unsubscribe-auth/ADK65Y7HRSHAFXO364ZGXBTTEUSPBANCNFSM4V7QR2XQ .