Hi, I am trying to do single point thread 1 1/4 unc on lathe and not sure what the settings should be in fusion360, like the pitch, or feed in angle and other stuff…also do I need a relief?
https://a360.co/3bamJSD
The TPI is 7 so the pitch is 1/7 or 0.1428
Thread depth is (Major Diameter - Minor Diameter)/2 = 0.0876 Normally requires a bit of adjustment.
I use a feed in angle of zero when using a 60 degree tool, but you also could try 29.5 degrees
Maybe try reduce step down
Depth of each pass at maybe 0.005
Relief is your choice, most likely needed of you don’t check "Fade Thread End’’
Try some different setting an find out what works best for your setup.
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this is what my thread program looks like…I need some help…changing this to 1.25".
:10 G0 G62 G71 G90 G98 X102/2-[M15]-[M14] Z250-[M16]-[M41] S700 M4
(MSG, METRIC G71 DIAMETER PROGRAM)
(MSG,THD BLOCK THREAD STRAIGHT METRIC M30 102MM LONG, 45 PULLOUT)
(MSG,MIN START=[7003.5.006]+[TAN302.147]=16MM)
(MSG,MIN STOP=7003.5*.0013=3.185MM)
(MSG,DEPTH ONE SIDE=2.147MM LENGTH 104.14MM)
(MSG,PITCH=3.5MM)
(MSG,FRONT FACE=Z0 PART 127MM FROM JAW FACE)
(MSG,USE COLLAR ON BARSTOCK TO SUPPORT BAR IN SPINDLE!)
(MSG,)
N25 M6 T1
N20 M8
N30 G95 F3.5
N40 G0 Z16+3.5+2.54-2.4
N50 X30.0
N60 (THD,H0 D0.179 A28 C1 X25.7060 Z0+16-2.4 R33.0)
N70 G33 X25.7060+3.185*2 Z-104.14-3.185-2.4 I0.00000 K3.50000
N80 (ENC)
N90 (MSG,RETRACT TO START)
N100 M9
N110 M5
N120 G0 G62 G71 G90 G98 X102/2-[M15]-[M14] Z250-[M16]-[M41]
N130 M2
%
O01001 (1-1/4 - 7 UNC)
G98 G18
G20
G50 S3400
G53 G0 X0.
G53 Z10.
(Thread1)
T303
(OD Threader)
G99
G97
S1000 M3
G54
M8
G0 Z0.1969
X1.45
Z0.589
G92 X1.2276 Z-1. F0.1428
X1.2052 F0.1428
X1.1828 F0.1428
X1.1604 F0.1428
X1.138 F0.1428
X1.1156 F0.1428
X1.0932 F0.1428
X1.0708 F0.1428
X1.0484 F0.1428
X1.026 F0.1428
G0 X1.45 Z0.1969
M9
G53 X0.
G53 Z10.
M5
M30
%
%
O01001 (1-1/4 - 7 UNC)
G98 G18
G20
G50 S4000
G53 G0 Y0.
G53 X0.
G53 Z10.
(Thread1)
T303
(OD Threader)
M155
G99
G97
S1000 M3
G54
M8
G18
G0 Z0.1969
X1.45 Y0.
Z0.589
G76 X1.026 Z-1. K0.112 D0.0112 A0. F0.1428
G0 X1.45 Z0.1969
M9
G53 Y0.
G53 X0.
G53 Z10.
M5
M155
G53 G0 Y0.
M30
%
ok, my post processor/fusion gives me a g92, and machine says no f value allowed…
so disabled g92 in fusion and now gives me a g138 witch I can not use, but I think I can use a g76…so now I need to change my postprocessor…
I posted using the generic Haas ST-20Y post processor.
ok got the numbers right but, what makes it do the 45 degree pullout? on the program I posted above…
it will pull straight out now…