user button for taper feed on lathe / cnc compound rest

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turbothis
Posts: 309
Joined: Fri Mar 15, 2019 4:07 pm
Location: southern oregon

user button for taper feed on lathe / cnc compound rest

Post by turbothis » Sun Apr 12, 2020 7:56 pm

hey, i would like to have a user button that runs a prescribed taper that has X and Z feed variables. not position
i am not sure if this exist already or what to even call it for a search
an electronic compound rest if you will.
i can do this now by setting the jog speeds and hitting both X and Z jogs at the same time but it is not to easy to achieve the angle and kinda wonky smacking 2 buttons at once
can an executive program run this from a user button jogging?
like have a text file on the desktop with a code for a X and Z feed command?

first thing is to have input variables to set the angle. example like 12" run and 2.5" rise. (carpentry lingo)
have a master Z jog feed and then a calculator thingy/part would need to output the correct feed speeds on the X to achieve this.
this is while holding the button like jogging.

example lol

Code: Select all

#include "KMotionDef.h"

#1=[12.000]                // Z run
#2=[0.100]                 // X rise
#3=[5.0]                    // main cut feed

Taper = [#2/#1]               // how much rise to do while running, "Taper" is variable?

 main ()
{
            jog( -X F #3, +Z F(Taper) );         // use variable to set X feed speed?
}
Attachments
Tool Movement in Taper Turning line diagram.jpg

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TomKerekes
Posts: 2529
Joined: Mon Dec 04, 2017 1:49 am

Re: user button for taper feed on lathe / cnc compound rest

Post by TomKerekes » Sun Apr 12, 2020 11:01 pm

Hi turbothis,

You could Jog along an angle from a KFLOP C Program by simply commanding the X axis to Jog at one speed and the Z axis to Jog at another speed at the same time. ie:

Jog(XAXIS, xspeed);
Jog(ZAXIS, zspeed);

then to stop

Jog(XAXIS, 0.0);
Jog(ZAXIS, 0.0);

Note the motion would not be perfectly linear while accelerating or decelerating but that would be the same as your current method.

You would also need to factor in the X and Z axis resolutions as KFLOP Jog commands work in steps and steps/second.

Another issue might be that the standard User Buttons are not momentary like Jog buttons. You could have a User Button start the taper motion and then a 2nd press could stop it. If you absolutely need momentary behavior you might add a momentary button with the KMotionCNC Screen Editor to control a Virtual Bit, then have a running KFLOP C Program monitor the bit and start/stop the jogging. Of course you could also add edit controls that could be read by KFLOP to control the angle and speed.
Regards,

Tom Kerekes
Dynomotion, Inc.

turbothis
Posts: 309
Joined: Fri Mar 15, 2019 4:07 pm
Location: southern oregon

Re: user button for taper feed on lathe / cnc compound rest

Post by turbothis » Thu Apr 06, 2023 7:54 pm

hey, i have been playing with chatgpt and wanted to revisit this thought.
i am not sure if the macro can be run as a G code or what would happen
i wanted to just have a keyboard button jog this so i told it "K" button

Code: Select all

; Macro for CNC lathe controller to cut at a specified angle in the X and Z-axis
; User inputs: spindle speed in RPM, angle of feed, feed speed (in inches per minute), feed Z-axis direction, feed X-axis direction

(Start of the macro)
O1000

; User input parameters
#1 = [SPINDLE_SPEED_RPM] (Spindle speed in RPM)
#2 = [ANGLE] (Angle of feed in degrees)
#3 = [FEED_SPEED_IPM] (Feed speed in inches per minute)
#4 = [Z_AXIS_DIRECTION] (Feed Z-axis direction: 1 for positive, -1 for negative)
#5 = [X_AXIS_DIRECTION] (Feed X-axis direction: 1 for positive, -1 for negative)

; Calculate incremental X and Z-axis movements
#6 = [#2 * 0.0174533] (Convert angle to radians)
#7 = [cos[#6]] (Cosine of the angle)
#8 = [sin[#6]] (Sine of the angle)
#9 = [#3 * #7 * #5] (Incremental X-axis movement)
#10 = [#3 * #8 * #4] (Incremental Z-axis movement)

; Check for valid input values
IF [ABS[#4] NE 1] GOTO 999
IF [ABS[#5] NE 1] GOTO 999

; Start spindle and set feed rate
M03 S#1 (Spindle on, clockwise, set spindle speed in RPM)
F#3 (Set feed rate in inches per minute)

; Begin cutting
(Button_Hold)
G91 G01 X#9 Z#10 (Feed at specified angle in X and Z-axis directions)
(Button_Check) (Check for "K" button release)
M00 (Hold for button release)
GOTO Button_Hold

(Button_Release)
G90 (Reset to absolute positioning)
M05 (Spindle off)
G28 (Return to home position)

M30 (End of the macro)
GOTO 1000

; Error handling
(Invalid_Input)
N999 (Invalid input values)
(End of the macro)
O1000 M99

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TomKerekes
Posts: 2529
Joined: Mon Dec 04, 2017 1:49 am

Re: user button for taper feed on lathe / cnc compound rest

Post by TomKerekes » Sat Apr 08, 2023 2:11 am

Not sure what you’re asking, but the Interpreter doesn’t have ‘if’ or ‘goto’ statements. You might look at the GCode examples such as SubroutineWithConditionals.ngc.
Regards,

Tom Kerekes
Dynomotion, Inc.

turbothis
Posts: 309
Joined: Fri Mar 15, 2019 4:07 pm
Location: southern oregon

Re: user button for taper feed on lathe / cnc compound rest

Post by turbothis » Thu Apr 13, 2023 7:04 pm

great, i will
thanks

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