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Author Topic: Major/ minor arcs in turn  (Read 12262 times)

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Offline RICH

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Re: Major/ minor arcs in turn
« Reply #10 on: May 31, 2009, 07:08:27 AM »
DaveA,
Could you post an example or some code, of what you are talking about. I took a look at my Smid book looking for some preferences in the interpretation but couldn't find anything specific. Just trying to learn something.
Thanks,
RICH

Offline DAlgie

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Re: Major/ minor arcs in turn
« Reply #11 on: May 31, 2009, 10:54:56 AM »
Yes, you have it there at that last post. The arc is still the same direction, but the unsigned centre is on the opposite side of where you want, so the arc is theoretically correct in direction, but just like that last screenshot you have. Somebody told me that this problem only shows up with either G3 or G2 but can't remember which, my lathe is not here so I will have to go check more and get a screenshot, but it will look a lot like what you got there.
    DaveA.

Offline Hood

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Re: Major/ minor arcs in turn
« Reply #12 on: May 31, 2009, 10:58:33 AM »
have never seen that, only way I got that was to code in 2 parts, wonder why you are seeing it?
Can you attach the code and your xml and I will see if I can reproduce here, also are you using an old version of Mach as I seem to recall that there was an issue similar waaaaaaaayyyyyyyyyyyyy back, but that was before I had a lathe so it didn't register in the old grey matter :)

Hood

Offline DAlgie

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Re: Major/ minor arcs in turn
« Reply #13 on: June 03, 2009, 01:44:04 AM »
Here's a couple of screenshots that melee got with his testing

Offline Hood

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Re: Major/ minor arcs in turn
« Reply #14 on: June 03, 2009, 02:34:41 AM »
What is the code for these screenshots?
Hood

Offline RICH

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Re: Major/ minor arcs in turn
« Reply #15 on: June 03, 2009, 03:01:20 PM »
DaveA,
Since you struck my curious side,

Pic #1 shows some info about using R values for arcs and was wondering if that is were you are comng from?

Pic #2 shows a simple arc on the end of a shaft using the R value ( + or - ) differently along with the effect of Reversed Arcs  checked, BTW this is for a lathe. The only difference in the code is the + or - R value. The first capture in the picture does the ball cut wanted.

RICH
« Last Edit: June 03, 2009, 03:12:33 PM by RICH »
Re: Major/ minor arcs in turn
« Reply #16 on: June 03, 2009, 03:14:13 PM »

Offline RICH

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Re: Major/ minor arcs in turn
« Reply #17 on: June 03, 2009, 04:49:02 PM »
SteinarN,
How about using this as an example.
RICH
Re: Major/ minor arcs in turn
« Reply #18 on: June 03, 2009, 06:02:28 PM »
I think I should buy a book explaining how to make g-codes.
One question, is it required to use I/K codes instead of R codes when making a part with arcs which would require both checked and unchecked Reversed Arcs in R codes?

Offline Hood

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Re: Major/ minor arcs in turn
« Reply #19 on: June 03, 2009, 06:51:44 PM »
The above shows a G2 and a G3 arc, wouldnt matter whether it was IK or R.
 Looks like the + or - with the R defines minor or major , having none on my system makes it a minor, wonder if Dave has a - in his code?
Hood