[nathanokkema]

I am looking to program a G76 on a workpiece just to round the corner ever so slightly so it isn't sharp. The axis coordinates I need rounded are X7.874 Z-0.450 and another corner that needs to be rounded is at X0.9500 Z-0.0450. I am unsure of how to write the code exactly. Any help is appreciated. Thanks.

My program is as follows:
G00 X19.7 Z4.
NAT1
(FACE THE FRONT)
(OD ROUGH RIGHT - 80 DEG.)
(CNMG-432)
G90 G95
M08
M41
G50 S1200
G97 S289 M03
T010101
G00 Z0.03
G00 X8.3207
G96 S630
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.3500
G00 Z0.01
G00 X8.3207
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.3500
G00 Z0.0
G00 X8.3207
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.05
G01 Z.03
Z-.929
X8.2
G00 Z.1
X8.02
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.990
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.970
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.950
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.920
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.900
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.884
G01 Z.03
Z-.929
X8.2
G00 Z.1
X7.874
G01 Z.03
Z-.929
X8.0
G00 Z.1
M09
M05
G00 X19.7 Z4.
NBT1
M00 (STOCK FLIP)
(T010101 - OD ROUGH RIGHT - 80 DEG. - CORNER RAD .0156")
NAT2
(FACE THE FRONT)
(OD ROUGH RIGHT - 80 DEG.)
(CNMG-432)
G90 G95
M08
M41
G50 S1200
G97 S289 M03
T010101
G00 Z-.02
G00 X8.3207
G96 S630
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.35
G00 Z-.0350
G00 X8.3207
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.35
G00 Z-.0450
G00 X8.3207
G01 G95 X8.3207 F.008
X6.668
G00 X3.1000
G01 X3.1000
X0.500
G00 Z.1
X8.05
G01 Z.03
Z-.43
X8.2
G00 Z.1
X8.02
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.990
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.970
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.950
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.920
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.900
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.884
G01 Z.03
Z-.43
X8.2
G00 Z.1
X7.874
G01 Z.03
Z-.43
X8.0
G00 Z.1
G00 X19.7 Z4.
M01
NAT2
(ROUGH ID)
(ID ROUGH MIN. 1.0 DIA. - 75 DEG.)
(NONE)
G90 G95
M08
M41
G50 S1200
G97 S289 M03
T101010
G00 Z.1
X1.4200
G96 S630
G01 G95 Z-1.300 F.008
G01 X1.4500
G00 Z.1
X1.3900
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.3600
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.3300
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.3000
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.2700
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.2400
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.2100
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
X1.1900
G01 G95 Z-1.300 F.008
G01 X1.4
G00 Z.1
G00 X1.1795
G01 G95 Z-1.300 F.008
G01 X1.2
G00 Z.1
G00 X1.1500
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X1.1200
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X1.1000
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9800
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9600
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9500
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X19.7 Z4.
M05
M00
M01
NAT2
(ROUGH ID 2)
(ID ROUGH MIN. 1.0 DIA. - 75 DEG.)
(NONE)
G90 G95
M08
M41
G50 S1200
G97 S289 M03
T101010
G00 Z.1
G00 X1.1500
G96 S630
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X1.1200
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X1.1000
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9800
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9600
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
G00 X0.9500
G01 G95 Z-.4695 F.008
G01 X1.2
G00 Z.1
M09
G97 S599
M05
G00 X19.7 Z4.
M02
%

[Algirdas]

did you try
G76 0.1 ?
or chamfer
G75 0.1 ?
Pay attention: Tool tip radius must be correctly set for these operations.

[kurmay]

G01 X7.874 Z-0.450 G76 L0.1

[deadlykitten]

I am unsure of how to write the code exactly.

hy nathanokemma if you wish, begin with drawing finish contour on a paper, and have a list of coordinates .... from there, i will show how to create the code, put compensation and chamfers

just to round the corner ever so slightly so it isn't sharp

for small chamfers, barely visible, you should use a small feed, so to allow the spindle to stay a couple of full revolutions over your chamfer

for example, for a 0.1chamfer, use a 0.03mm/revo ...

even so, if the feed before the chamfer is too big, relativ to the feed on the chamfer, then machine may still rush fast and not execute the chamfer corectly, because of controler tolerances, etc

in other words, small chamfers may appera diferently, only by changing the feedoverride this is food for thougth, as for now, i believe you should focus on how to write the code, if you have time, possibilty, etc / kindly

[Voss_Machine]

[machinehop5]

for small chamfers, barely visible, you should use a small feed, so to allow the spindle to stay a couple of full revolutions over your chamfer

for example, for a 0.1chamfer, use a 0.03mm/revo ...

even so, if the feed before the chamfer is too big, relativ to the feed on the chamfer, then machine may still rush fast and not execute the chamfer corectly, because of controler tolerances, etc

... use G09/G61 for Exact Stopping sharp corner or radius will fix that feed problem. Search "okuma exact stop"
DJ

[cricketidlogin]

Silverexch Com Login, Website: https://cricketidpro.in/2022/01/22/silver-exchange/

[deadlykitten]

... use G09/G61 for Exact Stopping sharp corner or radius will fix that feed problem. Search "okuma exact stop"

hy machinehop be sure, i know g-code for okuma droop control ...

9 61 is mill, and this is a lathe discusion my dear sunshine / you are the best ... kindly

[nathanokkema]

I tried inputting that code and got an "Alarm B Chamfering L Over". Maybe there's something I'm missing?

[nathanokkema]

hy nathanokemma if you wish, begin with drawing finish contour on a paper, and have a list of coordinates .... from there, i will show how to create the code, put compensation and chamfers



for small chamfers, barely visible, you should use a small feed, so to allow the spindle to stay a couple of full revolutions over your chamfer

for example, for a 0.1chamfer, use a 0.03mm/revo ...

even so, if the feed before the chamfer is too big, relativ to the feed on the chamfer, then machine may still rush fast and not execute the chamfer corectly, because of controler tolerances, etc

in other words, small chamfers may appera diferently, only by changing the feedoverride this is food for thougth, as for now, i believe you should focus on how to write the code, if you have time, possibilty, etc / kindly

Thank you my list of coordinates that need to be rounded are as follows:

X7.874 Z-.0450

X1.1795 Z-.4695

X.9500 Z-.0450

[Algirdas]

take the sheet of paper, pencil and draw the sketch.
starting point, final point, tool tip radius compensation and desired chamfer.
You will see very evidently.

[deadlykitten]

X7.874 Z-.0450

X1.1795 Z-.4695

X.9500 Z-.0450

hy nathanokemma that's not a regular od shape, because z goes z-, then z+ ... is this a face ?

pls share tool radius and desired chamfer/fillet value ... i will check from there / kindly

ps : hy mr bunny >oo<

[Mowzece]

Have you tried just using a G2 or G3 if you are only looking to radius a corner?
In my experience G76 is typically only used for auto rounding the two corners on a chamfer.
As far as your "ALARM B CHAMFERING L OVER" issue, remember that L is the radius value and if using cutter comp your start point and end point need to be outside of the tangent points before initiating or ending a G76

Example putting a .1 X 45° chamfer with .02 radius
on each corner going from face (Z Zero) to a 1.00 OD using 1/32 tool nose radius.

WITH CUTTER COMP ON
GO X.7 Z1.0 (RAPID CLEARANCE MOVE)
G1 G41 Z0 F50.0 (FEED TO FACE, ACTIVATE COMP)
X.7375 (STRAIT LINE FEED BUT BELOW START POINT)
G76 X.8 L.02 F.003 (START POINT OF CHAMFER W/RAD.)
G76 X1.0 Z-.1 L.02 (END POINT OF CHAMFER W/RAD.)
G1 Z-.14 (STRAIT LINE FEED BEYOND END POINT)
X1.1 F50.0 (RETRACT)

Hope this helps