Facing by rotating C axis on 5 axis trunnion machine?

[Joe788]

I've got a big round part that exceeds the Y+ travel on my 5 axis vertical. I'd like to face it by feeding the C axis in inverse time while feeding in the Y+ direction toward the center. Is there a stock toolpath that will do this without too much trouble? I've never had an issue getting the 5 axis output I want, but I figure it's better to ask before I spend 30 minutes dinking around with it.

[Trevor Bailey]

on some machines, this is called grinding.

 

• one way to do it is create spiral geometry at the pitch you want and then use a 2d contour path to follow the spiral.
• another is to use 5ax parallel to curve with spiral motion and 4 ax output.

[gcode]

on some machines, this is called grinding.

 

• one way to do it is create spiral geometry at the pitch you want and then use a 2d contour path to follow the spiral.
• another is to use 5ax parallel to curve with spiral motion and 4 ax output.

 

 

don't you need to use axis substitution to supress the X motion and restrict it to Y and C

[mayday]

morgh between 2 curves, I "mill" turn all the time using that. sweet cause you can tilt the head to eliminate drag from the back of the tool. 1 or 2 degree's is all you need

[Hardmill]

morgh between 2 curves, I "mill" turn all the time using that. sweet cause you can tilt the head to eliminate drag from the back of the tool. 1 or 2 degree's is all you need

 

 

You got a file i can look at ?? numbskull

 

 

 

 

 

 

 

 

 

 

PEACE

[mayday]

Ya, can you read?

[Joe788]

don't you need to use axis substitution to supress the X motion and restrict it to Y and C

 

This is what I was expecting to do. Tried two or three combos of axis sub for two minutes and then just switched to a 3 inch facemill to get that extra half inch that I couldn't reach.

 

I'd still be interested in how to get it to work though, 'cause I've got a bigger part coming up that I won't be able to reach even with a bigger facemill.

[mayday]

I post just a snipet. this is for a horazontal E-tower but you get the hint.

note the 2 degree lead angle on the B axis as C rotates and X travels to center

 

N1

G20 G10.9 X0

G91 G28 X0.

G28 Y0. Z0.

M901

T60 T60 M06

M200

G97 S210 M03

M108 M212

G0 G90 G53 B2.

M211

G18 G54

C99.9065

G90 G43.4 H60 X0. Z.8438

X7.7518 Y9.5108

M08

X-1.252 Y11.0833

X-1.266 Z.444

G94 G1 X-1.28 Z.0442 F16.

X-1.2671 C99.5854

X-1.2704 C98.7927

X-1.2736 C98.0009

X-1.276 C97.2127

X-1.2793 C96.4205

X-1.2825 C95.6284

X-1.2848 C94.841

X-1.26 C94.1938

X-1.2634 C93.401

X-1.2657 C92.6135

X-1.269 C91.8212

X-1.2722 C91.0291

X-1.2745 C90.2418

X-1.2634 C89.7578

X-1.28 C89.1307

X-1.2824 C88.3429

X-1.2576 C87.6957

X-1.2609 C86.9034

X-1.2632 C86.1161

X-1.2664 C85.324

X-1.2697 C84.5317

X-1.272 C83.744

X-1.2754 C82.9513

X-1.2786 C82.1589

X-1.2815 C81.3685

X-1.2842 C80.5795

X-1.2593 C79.9325

X-1.2626 C79.1401

X-1.265 C78.3523

X-1.2683 C77.5597

X-1.2715 C76.7674

X-1.2738 C75.9802

X-1.2771 C75.188

X-1.2803 C74.3957

X-1.2827 C73.608

X-1.2579 C72.9606

X-1.2612 C72.1682

X-1.2639 C71.3791

X-1.2667 C70.5887

X-1.27 C69.7965

X-1.2733 C69.0041

X-1.2757 C68.2163

X-1.279 C67.4238

X-1.2822 C66.6315

X-1.2845 C65.8442

X-1.2596 C65.1973

X-1.2629 C64.405

X-1.2653 C63.6174

X-1.2686 C62.8246

X-1.2719 C62.0322

X-1.2743 C61.2446

X-1.2774 C60.4528

X-1.2807 C59.6606

X-1.2838 C58.869

X-1.2582 C58.2257

X-1.2615 C57.433

X-1.2648 C56.6407

X-1.2671 C55.8535

X-1.2703 C55.0613

X-1.2736 C54.269

X-1.2759 C53.4814

X-1.2793 C52.6887

[Hardmill]

Can i see your MC file ??

 

Ya, can you read?

 

Waz that ??

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PEACE

[mayday]

Waz that

 

that mean you want it? I just roughed it in. Linking and other odds n ends are not set properly