Updated Post RPM Problem

[Greg Williams]

I have a problem with my Lathe post that I cannot seem to solve, Or perhaps I even created it myself.

 

MY problem is that the LB-300M post which started life as MPLOSP7 does not output the correct spindle RPM before CSS is activated

 

My LB300M Post Outputs (Note ********** Blocks)

 

NAT1

G50 S2500

X888. Z555. T010101 M8

G0 G94 G97 S509 M03 *********

G0 X160. Z10.

G96 S400

 

 

NAT3

X888. Z555. T030303 M8

G0 G94 G97 S318 M03************

G0 X200. Z-20.

G96 S250

G18 Z-16.431

 

 

NAT5

X888. Z555. T050505 M8

G0 G94 G97 S318 M03**********

G0 X30. Z10.

G96 S250

X29.406

 

 

MPLFAN outputs

 

G0 T0101

G18

G97 S796 M03*******************

G0 G54 X160. Z10. M8

G50 S2500

G96 S400

 

M01

(TOOL - 3 OFFSET - 3)

(LATHE TOOL 3 INSERT - N123J2-0500-0004-GM)

( GROOVE )

G0 T0303

G18

G97 S398 M03**************************

G0 G54 X200. Z-20. M8

G50 S2500

 

M01

(TOOL - 5 OFFSET - 5)

(LATHE TOOL 5 INSERT - VBMT 11 03 04-PF)

( FINISH BORE )

G0 T0505

G18

G97 S2500 M03********************

G0 G54 X30. Z10. M8

G50 S2500

 

As you can see for some reason my post is slighlty off in the spindle rev calculation speed. Any ideas where to look?

[Greg Williams]

Well as fate has it as soon as I asked this question I found the answewr

 

The fix is to # out the below line from ltlchg$ #Toolchange, lathe

 

#pmap_home #Get home position, xabs

 

The calculation is incorrect because this post has hardcoded home positions. As a result the RPM is calculated form the tool home position as defined in the toolpath parameters page which in my case was defaulted to 250mm dia. Hence the RPM of 507 at 400m/min cutting speed

[DavidB]

Hey Greg any news on that Okuma post with canned roughing and milling you where working on?

[DavidB]

Bump

[Greg Williams]

Hi Dave,

 

Ah yes still in progress.

There really needs to be a couple of posts as LB300M needs a slighty different output to LB300MY for the milling ops

 

[ 05-21-2008, 04:11 AM: Message edited by: Greg Williams ]

[Greg Williams]

Edit - The best option is to get a post from In-House, I am a tad snowed under at the moment

[Mick]

I'll second that. We purchased the InHouse post for our Multus B400W. It kicks a**.

 

It had to be tweaked (very minor) for use of the Sandvik twin/multi tools, but other than that it was almost perfect.

 

If you need great posts, go straight to InHouse.

[Post dept]

We are finding some variation in the Okuma lathes setup world wide based on the Okuma rep in the area, but usually it is a few minor tweaks. Thanks to Greg for all the Okuma support!