Threadmilling - No Rapid?

[Mick]

I just noticed,when toolpathing threadmilling, and then posting it, that when it reaches the bottom of a hole, or the top of the hole (depending on which way it is being cut), that it repositions on Z for the next cut at feedrate and not rapid rate. I thought it might have been something I edited in the post, but I tried two generic post processors, and they do the same thing.

 

Has any else ever noticed this?

 

NAT21 (THREADMILL 1 INCH BSW HOLE)

/ T21 M6 (20.562 X 8TPI WH THREADING BAR)

(MAX : Z5.)

(MIN : Z-30.)

S1500 M3

G0 G17 X0. Y0.

G56 Z5. H21 M8

G1 Z-30. F200.

G41 Y-2.069 D21

G3 X2.069 Y0. I0. J2.069

Z-26.825 I-2.069 J0.

Z-23.65 I-2.069 J0.

Z-20.475 I-2.069 J0.

Z-17.3 I-2.069 J0.

Z-14.125 I-2.069 J0.

Z-10.95 I-2.069 J0.

Z-7.775 I-2.069 J0.

Z-4.6 I-2.069 J0.

Z-1.425 I-2.069 J0.

Z1.75 I-2.069 J0.

X-1.624 Y1.281 Z3. I-2.069 J0.

X-1.281 Y-1.624 I1.624 J-1.281

G1 G40 X0. Y0.

Z-30. <-------- No rapid. Is this normal?

G41 Y-2.219 D21

G3 X2.219 Y0. I0. J2.219

Z-26.825 I-2.219 J0.

Z-23.65 I-2.219 J0.

Z-20.475 I-2.219 J0.

Z-17.3 I-2.219 J0.

Z-14.125 I-2.219 J0.

Z-10.95 I-2.219 J0.

Z-7.775 I-2.219 J0.

Z-4.6 I-2.219 J0.

Z-1.425 I-2.219 J0.

Z1.75 I-2.219 J0.

X-1.742 Y1.374 Z3. I-2.219 J0.

X-1.374 Y-1.742 I1.742 J-1.374

G1 G40 X0. Y0.

Z-30.

[Brando]

i think its always posted like that, there are no options for rapid plunge on the threadmill page, i just change the feed rate on the plunge field

 

 

(THREADMILL 3/8-16)

(MC TOOLPATH# 18 )

T123 M06 (VARDEX 375-16 THD MILL)

M62

(UNLOCK TABLE)

G00 G17 G90 G54.1 P2 B0. X4.7013 Y5.6897 S2538 M03

M10 (LOCK TABLE)

G94

G05.1 Q1 R5

G43 H123 Z2.

Z.1001

G01 Z-.7299 F300.

Y5.6782 F7.

G41 D123 X4.6877 Y5.6897

G03 X4.7012 Y5.6605 Z-.7143 I.0136 J-.0114

X4.7012 Y5.6605 Z-.6518 I0. J.0292

X4.7148 Y5.6897 Z-.6362 I0. J.0178

G01 G40 X4.7013 Y5.6782

Y5.6897

Z-.7299 F300.

Y5.6773 F7.

G41 D123 X4.6799 Y5.6897

G03 X4.7012 Y5.6527 Z-.7143 I.0214 J-.0123

X4.7012 Y5.6527 Z-.6518 I0. J.037

X4.7226 Y5.6897 Z-.6362 I0. J.0247

G01 G40 X4.7013 Y5.6773

Y5.6897

Z-.7299 F300.

Y5.6773 F7.

G41 D123 X4.6799 Y5.6897

G03 X4.7012 Y5.6527 Z-.7143 I.0214 J-.0123

X4.7012 Y5.6527 Z-.6518 I0. J.037

X4.7226 Y5.6897 Z-.6362 I0. J.0247

G01 G40 X4.7013 Y5.6773

Y5.6897

G00 Z2.

G05.1 Q0

G91 G30 Z0.

G49 G90

[Mick]

Thanks for the reply. Yes, to be honest, I've never really noticed it before, although to be honest I haven't done threadmilling in a while.

 

As you suggest, I'll just up the plunge rate/retraction rate

[Mick]

The plot thickens. If I set the threadmill to cut bottom to top, (climb milling) it outputs the high plunge rate.

 

If I set it to cut top to bottom (conventional milling), it doesn't output the high plunge rate. Ugh.

 

Of course, typically I would be climb milling, but... there is always that time when for whatever reason you need to go down instead of up

[Mick]

Fixed the problem below. It was a post issue

 

The plot thickens. If I set the threadmill to cut bottom to top, (climb milling) it outputs the high plunge rate.

 

If I set it to cut top to bottom (conventional milling), it doesn't output the high plunge rate. Ugh.

 

Of course, typically I would be climb milling, but... there is always that time when for whatever reason you need to go down instead of up

[Brando]

glad you got it all fixed up, but im curious was that a self inflicted post issue or a problem with the standard post you fixed?

[Mick]

Self inflicted I've made some major tweaks to this post to get it exactly where I want