Tilted Working Plane Function TWP Example & Usage for Makino D500
Tilted Work Plane Operation outline • By shifting and rotating work coordinate, you can create programs easily on transformed coordinate system. • This function requires input angle using EULER’s ANGLE definition. • Proper rotation : - View point looking at positive axis. - CCW rotation is positive angle. - sequence of rotation: 1st is Z, 2nd is X, 3rd is Z axis.
Euler Angle Definition Z” Z’
Z
Y’ Y X’
α°
I
X
Z Rotation 1st
Z” Y’’’ Y”
Y” Y’
X’’’
γ°
β°
X”
X’
J
K
X Rotation 2nd
Z Rotation Again 3rd
Work piece overview • Makino recommends using TWP in conjunction with TCP for hole feature machining when canned cycle output is preferred. – For rigid tapping, G84 canned cycle must be utilized, so must use TWP
• Best/easiest approach is to define the TWP coordinate system at the center & top of the hole to be machined – Orient Z axis positive vector with hole centerline
Transformed coordinate system G68.2 to center/top of hole
Original coordinate system G54
Work piece overview TWP example definition G68.2 X0 Y3.5705 Z3.511 I90. J-90. K0
Step #1 – All TWP definitions come from part zero coordinate system location and orientation
Example definition for this hole G68.2 X0 Y3.5705 Z3.511 I90. J-90. K0
Z Y Part zero coordinate system location/orientation – G54
X
Work piece overview TWP example definition G68.2 X0 Y3.5705 Z3.511 I90.J-90.K0
Step #2 – Move coordinate system to hole center & top plane, but do not rotate. This defines XYZ location from part zero to hole center – see red values above
Part zero coordinate system location/orientation – G54
Work piece overview TWP example definition G68.2 X0 Y3.5705 Z3.511 I90.J-90.K0
Step #3 – Rotate around Z for 1st orientation per Euler’s angle definition – see red value above Looking at Z+ vector, CCW rotation is positive direction, therefore value is positive
Work piece overview TWP example definition G68.2 X0 Y3.5705 Z3.511 I90.J-90.K0
Step #4 – Rotate around X for 2nd orientation per Euler’s angle definition – see red value above Looking at X+ vector, CCW rotation is positive direction, but rotation required is negative to bring Z+ parallel to hole centerline…therefore value is negative TWP definition is complete for this hole
Work piece overview Sample part, definitions and hole locations
1 2
6
3 4
5
Work piece overview Sample part, definitions and hole locations
Please note - Typically there are multiple combinations for angular rotations, which all are valid. We selected these for the example.
Drilling program example D500 Move to G54 X0 Y0 Must force proper A-axis rotation prior to TWP Defines TWP location and plane orientation Performs physical rotary axis rotation to TWP **IMPORTANT** Moves tool over top of hole Activate tool length compensation with G43 Canned cycle to drill hole going 1” deep from top surface Must be in this order – cancel cycle, cancel tool length, cancel TWP Send Z axis to machine home location to clear for next rotary motion
Next hole sequence for TWP
Rigid tapping program example D500 ALL FORMAT AND TWP DEFINITIONS ARE THE SAME AS DRILLING FOR RIGID TAPPING, EXCEPT AS NOTED BELOW
Makino M-code for rigid tap followed by spindle speed
Rigid tap canned cycle G84
Makino M-code for rigid tap followed by spindle speed
