4th Axis feedrates????

[Wanny]

Hi all

 

I've acquired a 4th axis with cenroid controls and with the post I'm using keep getting strange feedrate outputs as you can see below. Basically I want the tool to cut at the feedrate that I put in when I create the tool, it seems to change on every line.

When I do a normal toolpath, say a parrallel with a few simple curves it changes the feedrate as it goes along is there a simple setting to disable this and machine from the feedrate I have choosen.

 

 

G0 G54 G90 X-5.119 Y-2.798 A0. S7500 M3

G43 H4 Z64.56 M8

G1 G93 X-5.144 Y-2.637 F10748.4

G2 X-5.004 Y3.043 R16.342 F-.9

G1 X-4.754 Y6.822 F462.1

Z64.311 F7011.5

G3 X-6.231 Y-.873 R17.445 F1.2

X-4.798 Y-7.096 R17.528 F.9

G1 X-6.066 Y-6.213 F1132.7

Z64.061 F7011.5

G2 X-7.104 Y-1.064 R18.168 F-.7

X-6.515 Y4.4 R17.502 F-.8

X-6.022 Y5.964 R19.681 F-.2

G1 X-7.097 Y5.369 F1424.5

Z63.812 F7011.5

G3 X-7.188 Y5.088 R31.293 F0.

 

Any help would be greatly appreciated.

 

Thanks in advance

[[email protected]]

Search this forum for "inverse feedrates"

 

HTH

[Storkman]

In the CD switch 4 axis feedrates from inverse to UPM

[Wanny]

Thanks Murray I have been doing various searche since I knew we was getting the 4th axis and have learnt a great deal on machining methods and a bit on the post side. I'm kinda guessing it has something to do with this section in the post but not sure what the correct number would be.

 

 

#Feed control settings

convert_rpd$ : 0 #Convert rapid to rapid feed

use_fr : 1 #Output feedrate

#0 - programmed feedrate

#1 - inverse feedrate

#2 - inverse feedrate on 5 axis continuous

#3 - inverse feedrate on motion with rotary

inv_fd_typ : 0 #Calculate feed location options

#0 - inverse feed at tip

#1 - min-max on flute length

#2 - tip to pivot on tool length

#3 - min-max on flute length to pivot on tool length

[john316]

.

 

In the post above yours Terry advises "In the CD switch 4 axis feedrates from inverse to UPM". The CD is the Control Definition in Mcam. If you change it there it will modify your post for you.

 

You need to check which format your control uses. Some can use a straight feedrate but others use inverse feed which will output a lot of crazy looking numbers but the control needs them to syncronize the 4th axis with the XYZ movement.

 

.

[Wanny]

Cheers Terry but none of the feedrates are on inverse they are all on unit/min.

[Wanny]

Thanks John I have tried what Terry suggested but like you said I am getting an output of crazy numbers. All I'm trying to achieve is to machine 6 weird shape pockets around a headlight diameter, so I machine 1 then it rotates around then does the 2nd etc. it just seems to be outputting crazy numbers when its doing normal 3d work.

[Wanny]

Right Chaps

 

I changed 1 of the settings in the post from inverse speeds to programmed speeds and it seems to be outputting what I reguire.

 

Thanks for all your help

[kkominiarek]

I need inverse feedrates.

 

My post only post FR's when they change. I need to post FR's in all lines of code containing XYZ and A moves.

 

Is there a switch (in the post) I can change to post FR's in all lines?

[kkominiarek]

Here is answer as what to change in order to post out feedrates in each line of code.

 

In Post.....go to plinout (see below)

Change `feed to *feed

 

 

plinout #Output to NC of linear movement - feed

if not(cuttype <> 0 & xinc = 0 & yinc = 0 & zinc = 0 & ainc = 0 & cinc = 0), #avoid output of feed with no motion when changing between G93 and G94/G95

[

pcan1, pbld, n$, sgfeed, sgplane, `sgcode, sgabsinc, pccdia,

pxout, pyout, pzout, paout, *feed, strcantext, scoolant, e$ #pcout, *feed was `feed

]

 

 

Thanks to my "as always" helpful reseller Optipro and Chris Parish.

[buck30]

i have a good 4th axis Centroid post if you would like a copy??