revering a Face cut

[Keith Graydon]

Good Morning,

 

I am prepapring a piece of stock for machining. X27" x Y12". I'm FACE cutting with a 3" dia Shell mill, at 90 degrees and taking 2 passes with the finish pass at .005 in Z.

 

Im Using Ver 8.1.1 and an older FADAL VMC 15XT (decent 'tho).

 

QUESTION: How do i get the tool to stay down and reverse it's path for the finish cut? I dont like the rapid up, long (24") rapid back to the beginning and rapid down to start the finish cut.

 

I can do a lot of work arounds to fix this but i'd like to do iy right in that path in MasterCam.

 

TIA

KLG

[Guest]

I think the only way to do that is to make two separate facing operations.

[iowajim62]

Hi Keith,

In using 8.1.1 Face operation I used all absolute

values for parameters and high speed loops between cuts. Zigzag cutting method with 50%

stepover and Depth Cuts checked on. In depth cuts I used .005 finish pass and checked on Keep Tool Down box. Posted with MPMaster and looked good.

HTH

Jim

[Keith Graydon]

Hi,

 

Yes that keeps the tool down but that also forces a FEEDRATE back to the start point prior to the finish pass. Doesn't it? Thats even slower than a rapid. ( even tho im told about my hi feedrates LOL)

 

KLG

 

 

[ 10-08-2002, 12:56 PM: Message edited by: Keith Graydon ]

[cadcam]

So Keith you don't want it to use the plunge rate to go to "Z0" then back to the cutting rate?

 

Wait it does not move back to the starting point in this fashion it finishes the ruff and the move straight down the back to cutting rate and back to the start point.

 

Sample:

N40 G0 G90 G54 X-5.8475 Y-1.5388 S2200 M3

N50 G43 H1 Z2. M8

N60 Z.2

N70 G1 Z.01 F15.

N80 X5.7161 F25.

N90 G3 X6.5548 Y-.7001 J.8387

N100 X5.7161 Y.1386 I-.8387

N110 G1 X-4.5975

N120 G2 X-5.4362 Y.9773 J.8387

N130 X-4.5975 Y1.816 I.8387

N140 G1 X6.9661

N150 Z0. F15.

N160 X-4.5975 F25.

N170 G3 X-5.4362 Y.9773 J-.8387

N180 X-4.5975 Y.1386 I.8387

N190 G1 X5.7161

N200 G2 X6.5548 Y-.7001 J-.8387

N210 X5.7161 Y-1.5388 I-.8387

N220 G1 X-5.8475

N230 G0 Z2. M9

 

Please advise.

 

[ 10-08-2002, 01:02 PM: Message edited by: cadcam ]

[iowajim62]

Hi,

No it stays down at the end of the 1st pass and drops down in Z and cuts back to the original

start point where it drops down in Z again and

then cuts its last pass. The posted code I'm

looking at never lifts and doesn't go back

to the start point.

Jim

[Keith Graydon]

Dang Jim Im glad you came to work today. (everyone else too)

Keep tool down does in fact, allow it to retrace the path in reverse.

 

Thank you.

[iowajim62]

Keith,

Your welcome sir. This is the perfect example

of the nice side of this Forum.

Have a nice day.

Jim

[Guest]

Well I was wrong and have learned something new today. Sorry and Thanks.