Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Overloaded on December 28, 2007, 04:04:24 PM
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Hello All,
What is to be entered in the "Tip Dir." column in the format illustrated ?
Chapter 9.2 on page 94.
Is this taken care of by using G41/42 and to be disregarded ?
Is all that is needed the X and Z offsets and the tool tip radius ?
PS: Tried to post the screenshot, print screen, paint, paste,additional options, browse. All went well...but the file was almost 3 meg. How do you make them smaller to post more quickly ?
Thanks,
RC
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I just use the X and Z offsets, wondered about the Tip Direction a while back and Graham answered my question, you will see it here http://www.machsupport.com/forum/index.php/topic,4413.0.html
Not done much with the lathe yet as I still dont have it totally finished but so far I have not found the need for tip radius entries.
Hood
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Oh and for screen grabs get yourself the free version of ScreenHunter, you can capture and save images to a location you choose, you can decide how to capture the area you want etc etc and typically it will save a full screen well under 100KB.
Hood
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Hood, Thanks twice.
Graham's explanation was excellent as always. I saw a similar illustration in the Turn man. but did not understand totally.
To shed a little light on what I'm into:
I need to cut a .005" radius from the face of the material to the OD, or vise versa, with a tool tip radius of .005".
The only way I can get it close is with a super sharp point, which is no good of course. The comp. should do exactly what I need if I understand it correctly and can get a grip on it.
Everything I've tried so far goes totally NUTS.
1 more question: The manual said something to the effect of : This is under development in Mach .
I hope it is working properly and I'm not beating a dead horse. Do you know if it has been finalized ?
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Sorry dont know, you would have to ask Brian or Art that.
Hood
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Give me some dimensions of the arc and part you want to cut and I will give you some sample code.
Do you work rad or dia?
Graham.
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As for screen shots, I think most of us use Wisdom-soft Screen hunter, its FREE.
http://www.wisdom-soft.com/downloads/downloadfiles.htm
Graham.
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Hello Graham,
I'll try to send a sketch.
Dia. mode.
It's actually tubing and I am facing from the id outward, then the radius, then the taper.
Thanks,
RC
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This is a sample of the code you will need to produce the part.
(USE TOOL OFFSET TABLE)
(SET TIP RAD TO MATCH TOOL)
(SET TIP DIRECTION TO 3)
N1 T0101
G00 X.2 Z.1 G97 S1000 M3
G01 G42 Z0 F0.004
X0.353 F.001
G03 X.368 Z-.007 R.007
G01 X.38 Z-.09 F.002
Z-.25
X.5
G00 G40 X1. Z1. T0100
M30
Graham.
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Thanks Graham, I'm anxious to run it tomorrow.
I was using the Center Format, Inc. IJ previously. The Radius Format method looks simpler. I had not tried it.
Getting better every day, with help of course.
Thanks to you and Hood for the Screen hunter tip, it's really KEEEEN.
I'll soon be needing some sort of auto feed system, that's another topic.
Thanks again,
RC
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Hello,
I was not able to try this on my lathe today but I did run it "dry" with the PC at home.
Something isn't quite right.
Watching the DRO's, every cut is tapering. And the radius..............well.
Tip Direction is 3, tool radius is .005" and offsets 0 - 0 in the tool table.
::)
Also, I cannot find any reference to G97, please explain.
Thanks,
RC
I checked settings, changed nothing then ran it againand got the results in the last image. Had to use camera, if I hit any key, the green tool path goes away. Pick hunter stops the run and clears the green line too.
Happy New Year,
RC
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To Graham, Hood, ART, Brian and the whole gang at ARTSOFT and on the Forum.
Thanks for the help, party safely, and HAPPY NEW YEAR !
Hopefuly we can work on this next year,
regards,
RC
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G96 and G97
Graham.
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It would appear there are a few issues with comp and front/rear turrets. Brian has it on his to do list now, so it will get sorted.
Here is a non G42 version for you to try.
%
G20 G40 G00 G90 G94 G61
G43
N1 T0101 (MINI TURN .005 THOU RAD)
G00 X0.19 Z0.1 G97 S1000 M3
G01 Z0. F0.4
X0.321
G03 X0.341 Z-0.009 R0.01
G01 X0.375 Z-0.255
Z-1.005
X0.575
G00 X1. Z1. T0100
M30
%
Graham.
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Thanks Graham,
See attachments for results:
I changed G3 to G2, (2nd pic), then went from Radius Format Arc to Center Format and ended up with the last pic.
With Radius Format and G2, the radius point looks to be at the X and Z intersection.
I will try to make this work for now.
Thanks again,
RC
Interesting discovery: Turn Options.
With "Reversed Arcs in Front Post" checked...G2 cuts CW
unchecked, G2 cuts CCW
Opposite of what I would have expected.
Anyway, the direction is OK now but it's weird in Rad. Format Arc mode..OK in Center Format.
Thanks
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RC
Go to your Ports and Pins then to Turn Options and put a check in (or take it out) the reversed arcs box and then regen your toolpath, you should now be OK.
Hood
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Hey Hood, I was editing my last post as you were responding.
I did as you said, see my edit. That gets the direction right but the actual arc is goofy when using the Radius format. It seems OK using the Center Format.
Thanks Hood
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Hi, Overloaded
If your using LCam to generate your G-code, I think, Theres a Bug in the LC Default Post.
Thanks, Chip