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Mach Turn Problem
« on: January 23, 2008, 06:17:09 AM »
I know that it is more likely to be operator probems as I am new to this. I have just finished converting my Boxford TLC250. It works very well with manual entries and I have also tried some turning wizards with success.
However when I try a simple end facing toolpath generated by mastercam X2 the tool starts at the correct piont but it faces the whole diameter of the stock. I set Z by taking a light cut and zeroing the z axis. I then take a light cut over the diameter, measure the diameter and enter that in thex axis. A printout of the toolpath is below.  Post proc is Fanuc 2 axis slant bed.

(PROGRAM NAME - Test)
(DATE=DD-MM-YY - 22-01-08 TIME=HH:MM - 19:15)
(MCX FILE - Test)
(NC FILE - C:\MCAMX\LATHE\NC\T.NC)
(MATERIAL - ALUMINUM MM - 2024)
G21
(TOOL - 1 OFFSET - 1)
(OD ROUGH RIGHT - 80 DEG.  INSERT - CNMG 12 04 08)
G0 T0101
G97 S500 M03
G0 G54 X37.95 Z0.
Z.52
G98 G1 X-1.6 F30.
G0 Z2.52
X37.95
Z.26
G1 X-1.6
G0 Z2.26
X37.95
Z0.
G1 X-1.6
G0 Z2.
G28 U0. W0. M05
T0100
M30

I also noticed tha the Mach 3 toolpath representation shows a front toolpost while Master cam shows rear toolpost, the lathe has a rear toolpost.
I would be gratefull if anyone can point me in the correct direction to rectify the above.

Regards

Arthur

Offline Hood

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Re: Mach Turn Problem
« Reply #1 on: January 23, 2008, 07:57:31 AM »
Your problem is either some settings in MasterCAM or you need to try a different Post Processor.
For your toolpath view problem just go to Config menu then down to Toolpath. In the middle somewhere you will see the option to Show tool above center, or something like that.
Hood
Re: Mach Turn Problem
« Reply #2 on: January 23, 2008, 10:58:46 AM »
Thanks Hood

I have the display correct now but struggling with Mcam. It seems that Mcam sees the centre of the bar at half the diameter 19.75 and drives the tool to 1.6mm past the other side of the bar. I can easily manually change the code to correct this this but would prefer for the software to do this.

Has anyone any recomendations for which Post Processor to use for Mach turn and Mcam?

Regards

Arthur

Offline Hood

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Re: Mach Turn Problem
« Reply #3 on: January 23, 2008, 11:06:38 AM »
You should be able to edit your post processor to use Dia rather than Radius. I dont have and have never used MasterCAM so dont know buty most of these CAM packages come with an editor for the Post Processor.
Hood

Offline DAlgie

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Re: Mach Turn Problem
« Reply #4 on: January 23, 2008, 04:44:39 PM »
I read that G code as it sending the tool 1.6mm past the center of the bar, probably to make up for the tool tip radius not cutting if you just machine to X0. You DO have to X0 set at the machine center, do you?
    DaveA.
Re: Mach Turn Problem
« Reply #5 on: January 23, 2008, 05:36:56 PM »
Thanks guys,

 I found another post processor for mach 3 lathe and it has cured all problems after setting mach3 to Radius.  http://cnc.novalab.org/mach_files.htm


Regards

Arthur

Offline Hood

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Re: Mach Turn Problem
« Reply #6 on: January 23, 2008, 05:59:39 PM »
personally I prefer Dia mode so I would be editing the post, but if you like Radius mode then your sorted :)

Hood
Re: Mach Turn Problem
« Reply #7 on: January 23, 2008, 06:03:36 PM »
Once I figure out how to edit the post I will change to diameter mode which is wat I would prefer. Main thing is I am getting results that make sense now.

Regards

Arthur

Offline Hood

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Re: Mach Turn Problem
« Reply #8 on: January 23, 2008, 06:08:33 PM »
Arthur
Just curious where you are from with a name like FlyingScot?
Hood
Re: Mach Turn Problem
« Reply #9 on: January 23, 2008, 06:14:57 PM »

Not far from Edinburgh, I fly RC aircraft and my great grandfather was one of the first drivers on the Flying Scotsman non stop Edinburgh to London. So the name is quite relevant.

Arthur