Hello Guest it is December 06, 2019, 10:47:48 PM

Author Topic: Help with Mach3 Lathe Toolpath display  (Read 5255 times)

0 Members and 1 Guest are viewing this topic.

Offline Leed3

*
  •  159 159
    • View Profile
Help with Mach3 Lathe Toolpath display
« on: November 01, 2006, 11:36:38 AM »
Hi,
Please look at the following and tell me what is happening and how to correct it.
To see the problem do this:

1. Open Mach3 lathe and load program
%(DrillRollers.tap)
G20 G40 G49 G80 G90 G94
G00 Z.9
G00 Z.2
G01 Z0 F5 (Move to stock face)
G01 Z-1.2 F4 (Drill in 1.2")
G00 z.9 (Move out to clear)
M30 (rewind)
2. Run it without setting any coords and look at toolpath display.

3. Close the file and open the program
G20 G40 G49 G80 G90 G94 (Imperial and standard modes)
G00 x0.3 Z0.05
F4
S1000 M0
G01 X0.28
G01 Z-1.2 (first cut)
G00 X0.3
G00 Z0.05
G01 X0.26
G01 Z-1.2 (second cut)
G00 X0.3
G00 Z0.05
M30 (rewind)
This is from the Using Turn3 PDF Page 3-10

4. Run the program looking at the toolpath display. Then close the program and reload the first program and run it it again.
It looks different. My first question is why? Apparently program 2 is leaving some leftovers in Mach3 lathe. The only thing leftover that I saw was that X Limits were left in.

My second question is how to make the toolpath display show the right thing if I do not load  program 2. Here is what I am doing. I have a piece of 1.25" Dia. stock that is 1" long mounted in the chuck. I have a drill chuck with drill bit mounted on the crossfeed. I am center drilling the stock to a depth of 1.2". Z is at the face of the stock. The program (no 1) works fine but the display shows the stock face as being at approx -1.0". I have tried changing the world Z coord, machine coords and display coords but I cannot get the right combination to make the display look right.  Can anyone tell me what I need to set to make the toolpath display look right? I want it to look more like what I see after doing the program 2 then program 1 scenario described above.

Hopefully, my rambling makes sense.

Offline Chip

*
  • *
  •  2,056 2,056
  • Gainesville Florida USA
    • View Profile
Re: Help with Mach3 Lathe Toolpath display
« Reply #1 on: November 01, 2006, 01:05:21 PM »
Hi, Leed3

I think your not re-zeroing Z and X or Regen.?
Try this

%(DrillRollers.tap)
G20 G40 G49 G80 G90 G94
G00 Z.9
G00 Z.2
G01 Z0 F5 (Move to stock face)
G01 Z-1.2 F4 (Drill in 1.2")
G00 z.9 (Move out to clear)
g00 z0;-----------------------zero added
;-----------------------------M30 (rewind)
;-----------------------------G20 G40 G49 G80 G90 G94 (Imperial and standard modes)
G00 x0.3 Z0.05
F4
;-----------------------------No spindle hoo-ed up for me ;S1000 M0
G01 X0.28
G01 Z-1.2 (first cut)
G00 X0.3
G00 Z0.05
G01 X0.26
G01 Z-1.2 (second cut)
G00 X0.3
G00 Z0.05
g00 Z0;-----------------------zero added
g00 x0;-----------------------zero added
;---------------------------------M30 (rewind)
;--------------------------------%(DrillRollers.tap)
;--------------------------------G20 G40 G49 G80 G90 G94
G00 Z.9
G00 Z.2
G01 Z0 F5 (Move to stock face)
G01 Z-1.2 F4 (Drill in 1.2")
G00 z.9 (Move out to clear)
G00 Z0;-------------------------- zero added
M30 (rewind)

Hope this Helps, Chip

Offline Leed3

*
  •  159 159
    • View Profile
Re: Help with Mach3 Lathe Toolpath display
« Reply #2 on: November 01, 2006, 01:36:56 PM »
Hi Chip,
Thanks for the reply. I did not want to combine the 2 programs. I just wanted to know 2 things. 1. Why the toolpath display for DrillRollers was different after running TurnDown and 2. How to make DrillRollers look correct in the toolpath display assuming that TurnDown didn't even exist.

My concern with number 1 makes me think that you should exit Mach 3 Lathe and restart it before loading a new program. My intention with the DrillRollers program is to run it and drill all the pieces. Then mount the pieces on a mandrel and run 2 different programs 1 to shape the back of the Roller and another to shape the front of the Roller.

My concern with number 2 is simply how do I get the toolpath display to look correct. I do not want to change the position of X since I carefully set it manually to be on the centerline (x=0) of the stock before running the program. I have drilled the rollers and they came out fine.

Hopefully, this clears up my previous post.
Thanks
Lee

Offline DAlgie

*
  •  304 304
    • View Profile
    • Algie Composite Aircraft
Re: Help with Mach3 Lathe Toolpath display
« Reply #3 on: November 04, 2006, 12:24:14 AM »
I'd have to admit that my lathe screen has toolpath display problems as well. Some programs show it clearly and all is as it should be, some are sort of messed up and I have to go back to my old Fanuc CNC lathe methods that had no real time toolpath display at all, and ignore it. It's sort of random, sometimes the display won't have any shading, but is ok in general, sometimes it will show odd stuff that is not meant to be there.
        Dave.

Offline Leed3

*
  •  159 159
    • View Profile
Re: Help with Mach3 Lathe Toolpath display
« Reply #4 on: November 04, 2006, 08:02:37 PM »
Hi Dave,
Thanks for letting me know. Your situation sounds like what I have noticed. The key thing is that Mach 3 cuts the metal just fine. I am grateful for that. In my case, since I was not moving the X axis, Mach 3 could not figure out a minimum and maximum x. The next program that I ran ( facing the stock to the right length) displayed fine.
Thanks again
Lee

Offline Chip

*
  • *
  •  2,056 2,056
  • Gainesville Florida USA
    • View Profile
Re: Help with Mach3 Lathe Toolpath display
« Reply #5 on: November 05, 2006, 11:26:06 AM »
Hi, Lee & Dave

Maybe there needs to be a Diameter / radius setting in setting's Page, Like the one's used for Rotational Axes's in Mill.

This would  eliminate the guess work MachLathe dose now.

Haven't done much lathe cnc work, Just a thought.

Maybe just need's proper Gcode start-up word's

I'm sure someone out there will advise.

Thank's Chip

Offline DAlgie

*
  •  304 304
    • View Profile
    • Algie Composite Aircraft
Re: Help with Mach3 Lathe Toolpath display
« Reply #6 on: November 05, 2006, 01:39:28 PM »
My lathe is set in diameter mode, and the diameter always seems to display ok, or not wierd anyway, it seems to be when you have a more complex part it goes crazy. Simple shapes such as the wizards will machine usually display ok. Lee, you have diameter mode set up or radius?