MPGEN5AX Post VX

[kccadcam]

How many of you are using this post??

I have a Makino Horizontal 5-axis Table/Table.

code:

---

# 5 Axis Rotary Settings

#Assign axis address

str_pri_axis "B"

str_sec_axis "A"

str_dum_axis "A"

---

A travel +10 to -110 (A-90 table faces spindle)

B travel unlimited wind-up

 

I have issues with positioning.

 

code:

---

# mi4 - Start initial primary rotary axis bias

# +/-999 represents start as close to limit as possible

# 0 represents calculate without using bias

# Any other value represents an angle in degrees to attempt

# to position near.

# -999 = Low, 0 = Off/Default, 999 = Hi, Value = Angle bias

#

# mi5 - Start initial secondary rotary axis bias

# +/-999 represents start as close to limit as possible

# 0 represents calculate without using bias

# Any other value represents an angle in degrees to attempt

# to position near.

# -999 = Low, 0 = Off/Default, 999 = Hi, Value = Angle bias

---

I don't fully understand this, seems like a guessing game........

 

I have a spot drill come in and drill 4 holes,

then toolchange to a drill in the same plane and it repositions!! (un-wind??)

It does not seem to matter if frc_cinit is 0 or 1.

Look at highlighted indexes:

code:

---

Z26.

( .190 DIA HOLE IN LEFT FACE )

B182.962 A-.305

X-19.8838 Y15.7151

G81 G98 Z12.5171 R12.7171 F1.

G80

( CENTER TANG LEFT .156 HOLE )

B186.145 A-.631

X5.8304 Y16.4688

G81 G98 Z20.2164 R20.4164 F1.

G80

( CENTER TANG RIGHT .156 HOLE )

X1.5102 Y16.3992

G81 G98 Z20.183 R20.383 F1.

G80

( CENTER BORE )

B252.993 A-96.144 <----------------180 too far

X-8.8398 Y-11.4458

Z16.1536

G81 G99 Z15.9536 R16.1536 F1.

X-10.3023 Y-11.8906

X-10.8668 Y-10.0343

X-9.4043 Y-9.5896

G80

Z26.

M9

G91 G28 Z0. M5

G49

G91 G28 Y0.

M1

M6 ( 13/64 SOLID CARBIDE DRILL TOOL - 11 )

( CENTER BORE )

G0 G90 X8.8398 Y11.4458 T15

B72.993 A-83.856

<------------should be this

M3 S1500

G43 H11 Z22. /M8

Z16.1536

G81 G99 Z15.0536 R16.1536 F5.6

X10.3023 Y11.8906

X10.8668 Y10.0343

X9.4043 Y9.5896

G80

---

Any ideas on how to position the last spot drill index at the same index as the first position of the drill?

Is there something I'm missing?? I should be able to put -180 in mi4 on the spot drill op???

Dazed and confuzed...........

[Mike-T]

I've never messed with those settings, Are you creating Tool planes ??

[mgsanchez]

I have used the MPGEN5AX post. Unfortunatly the MPGEN5AX post will not work the way you are hoping that it would.

 

Don't take this wrong, but you are going to have to live with it. Let me explain, when the post performs the the calculations for your spot drill position it finds multiple solutions, so then it freaks out and then picks the first solution. When you change tools to your drill it follows the same exercise and does the same thing as the spot drill.

 

You can "trick" the post to find only one solution and work the way you want, but your part accuracy will suffer.

 

What really needs to be done is to write a postblock to so the MPGEM5AX post works the way you would like. This can be done, but it is not an easy task. Expect to pay lots of $$$$$ or spend lots of time for this one.

 

Hope this helps,

Mike

[mgsanchez]

Kevin,

 

I just thought of something, but I will need your file to comfirm. If you can place your file where I can get to it and I will run it thru my post and check the output.

 

Mike

 

[ 04-10-2007, 05:22 PM: Message edited by: mgsanchez ]

[MIL-TFP-41]

Kevin,

 

Check your e-mail.....

 

try setting mi4 to 180 or 252

[DavidB]

Kevin,

I use the Generic Fanuc 5X mill post for my Horizontal 5-axis Makino A66 that comes with a MC install.

Did some mods with the help of this forum (GREG.

Works a treat.

[kccadcam]

Thanks for the info James, good to talk with you again....

I think I found the problem, frc_cinit must be zero.

It keeps recalculating from zero at every toolchange. Then the mi's work correctly.

Now I just have to go back thru 812 operations and tweak everything!!!!

[crazy^millman]

If an Mi thing the change operation works great in X for this without Red X the operation.

 

HTH

[kccadcam]

Found something else:

bias_null : 1 #mi4 and mi5 bias are applied at null toolchanges

 

That is what I was really looking for...

Now everything is working great except my right angle head..(that's another story)