G-code, G41 and G42 3

[dho]

how to use these codes? what do left or right means?
if in turning half a ball (sphere), from 0 to 90 degrees, G41 (or G42) will compensate right?
thanks.

 

[ornerynorsk]

You might want to start with a basic intro to cnc book. G41 offset compensation is for climb milling, G42 is for conventional milling. Left and right simply confuse the issue. A good book or manual with illustrations and accompanying sample code will be the easiest. As they say, a picture is worth a thousand words.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[mcgyvr]

In general.. Cutter compensation
G41 means the cutter stays to the left of the programmed path.
G42 means the cutter stays to the right of the programmed path.

 

[looslib]

In your ball example, assuming the 0 is furthest from the lathe head and the 90 is furthest from the lathe spindle axis AND you are cutting above tha axis, then a G42 with appropriate value entered in the machine controller for that tool offset will cut the part oversize with a positive ofset value. The tool stays to the right of the theoretical shape.

G41 for climb and G42 for conventional is not always a valid statement, especially on a lathe.

Think of it as driving a car and staying away from the centerline on the road. If I want to stay to the right in the direction of travel by 2 feet, I enter 2 in the offset register and use a G42 to stay to the right of the line. If I want to drive in England, I would use a G41 to stay away from the centerline.


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[dho]

i have code from several machinists........ three seem not right in some degree.
your judgement?

xx---cor

We use a .012 R tool

G0 X.8563 Z.1
G96 S300
G1 Z.025 F.002
G41 Z0
X.75
G2 X.6131 Z-.0183 I0 K-.137
G3 X.48 Z-.04 I-.0665 K.0913
G1 X.1254

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XX-tool

The following G-code requires a .008 tool nose radius. X.766 Z0; G2 X.6112 Z-.0248 R.133; G3 X.496 Z-.040 R.117.

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XX--com

Untitled
N4G97S1625M13(FINISH FORM FACE)
M98P1
T0404
G0G99X.9Z.1
G1G41X.85Z.0005F.005
X.750F.0005
G2X.615Z-.020R.125
G3X.48Z-.040R.125
G1X.15
G40Z.1F.2
M98P2
M1

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XX-TECH

NAT05(R.BORE)
N0600G97S2500M08
N0601G00X0.185Z0.05T050505
N0602G96S275
N0603G85N0604D.025F0.004U0.008W0.004
N0604G81
N0605G00X0.75
N0606G01Z0G41E0.004
N0607G02X0.615Z-0.02I0.0003K-0.125E0.004
N0608G03X0.48Z-0.04I-0.0678K0.105
N0609G01X0.22