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G73 parameters
« on: November 04, 2010, 08:15:52 PM »
I'm trying to use G73 for a row of deep drilled holes, and I can't see any guidance in the manual for the use of the parameters. I gather from other discussions that X & Y are the start position, that Z is the hole depth, R is the final retract position (maybe), L is the number of repeats (only useful in incremental mode) and Q is the retract increment. So what do A, B & C do? And have I got ANY of them right?

In other discussions F is brought in as a feed rate, but it's not mentioned in the G73 description. If F is a valid parameter for G73 shouldn't it be mentioned along with the others?

Can anyone clarify what the parameters are? Simple examples in absolute and incremental modes would be useful.

And if you did the same for the other canned cycles I suspect you'd be doing everyone a favour!


Keith

(not involved in previous G73 discussions)
Keith  S. Angus

Offline BR549

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Re: G73 parameters
« Reply #1 on: November 04, 2010, 09:12:10 PM »
yOU need to read the entire section on canned cycles to get the whole picture.

In a nutshell.

G98/G99 sets the initial retract level of the canned cycles. G98 = r level as stated in the call, G99 is to the level previous to the call

XYZ are the primary axis   XY are location and Z = depth of the cycle

ABC are secondary axis, normally rotary, using polar movements

F = feedrate of the cycle
R = retract level above the hole
Q = peck or step distance in a pecking drilling cycle
L = # of repeats, normally for incremental use

G80 cancells the canned cycle

SO for a normal G73 cycle

G98
G0 X1.000 Y1.000
G73 X1.000 Y1.000 Z-0.500 R.1 Q.050 F5
X2.000 Y2.000
X3.000 Y3.000 Z-0.750 Q.025
X4.000 Y4.000
G80

Hope that helps, (;-)TP

Offline BR549

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Re: G73 parameters
« Reply #2 on: November 04, 2010, 09:35:01 PM »
INcremental:

G98
G0X0.000 Y0.000
G91
G73 X1.000 Y.000 Z-.5 R.1 Q.050 F10
X1 L3
G80
G90
M30
Re: G73 parameters
« Reply #3 on: November 05, 2010, 01:41:28 AM »
Thank you for that clarification. I have read the manual repeatedly, but it is clear that the discussion of G81 to G89 does not include G73, so it is not certain that the parameters described there also apply to G73. Previous versions of G73 I have used had a clear explanation but used different parameter letters.

Your second example in incremental mode is almost the entire programme for the machine I'm designing!

Thanks for the quick response.
Keith  S. Angus