Thread Milling on M32 sub. without Y axis.

[tejano4life72]

Thread Milling

I just wanted to know if anybody out there has thread mill on a M32 citizen on the sub. without having Y axis on the turret? I know it sounds like it would be able to, using X, Z, and C axis. But has somebody actually done it. Thanks

[SWISS-TECH]

THIS IS A PROGRAM I RAN TO THREAD MILL A 3/8-16 THREAD IN A STAR SV-32 MACHINE.The "y" in this program is like "x" in most machines.

N5(ID THREAD-3/8-16)
G98M8(C-AXIS ON / IN. PER MIN.)
G0C0.
T2064(ID THREAD MILL)
#124=0.50(Z-DEAPTH)
#125=[#124/.0625*360]
G97
M47S1000(LIVE TOOL ON)
G0Y0.0T64
G0Z-0.10
G0Y0.145
G1W0.50H-#125F2000.
G0Y0.0
G0Z-0.10
G28V0W0T0
M48
M9
G99
M1

[chunkymonkey]

With all due respects to all responses, it kind of looks as if the above program is a hard numbered program for a thread whirl instead of a thread mill. That looks like our G32 for taps and screws where the H axis is our degrees in C. Thread milling should move in an actual Y axis. Otherwise I think your degrees that the C axis moves will make the thread "cave in" on itself. The more it moves in C one way, the closer your major diameter comes to touching itself. If you make a hole in G16, The hole is not round as it is eggshaped.

[SWISS-TECH]

This is the way I have thread milled alot of parts using a single form thread mill. It seems to work real well. The threads look good and the thread gages work fine.

[chunkymonkey]

On an ID thread?

[chunkymonkey]

how are you setting your helical angle?

[tejano4life72]

Thank you for the replys, ok i have read all of your replys but here goes a nother question. Same question as above but the thread being off center. I have a friend that is trying to thread mill an off center hole just using X,Z, and C axis. Can that be done and has somebody actually done it. The machine makes the movements but it is leaving a 2 flats on the major of the threads.

[tejano4life72]

sorry i meant to write minor not major, sorry

[chunkymonkey]

Remember, you must take in to account the helical angle like whirling. The formula for that is tan-1[pitch/[pitchø*pi]]. Your flat is probably being caused by that. You still can not properly threadmill with out a proper Y axis or a tool that can be positioned at an angled other than 0/90

[chunkymonkey]

It might be in good interest to remember that thread mills are expensive. The average cost i hear is 100. Taps are much cheaper.

[justB]

When the program posts it looks like this.

G0 G90 Z1.
G0 X.19 C_V$WSP$=180.000
G0 Z.1 F0.002
G1 Z0.
G0 G90 Z-.5206
G0 X.19 C_V$WSP$=180.000
TRANSMIT_S_V$WSP$
G0 X-.19 Y0.
G1 Z-.56
G1 G41 X.2475 Y0.
G3 X.2475 Y0. Z-.51 I-.4375 J0.
G3 X.2475 Y0. Z-.46 I-.4375 J0.
G3 X.2475 Y0. Z-.41 I-.4375 J0.
G3 X.2475 Y0. Z-.36 I-.4375 J0.
G1 G40 X-.19 Y0.
G0 Z.0394
G1 X-.1691 Z1.

M_V$WSP$13
TRANS_OFF
M_V$SP$=5
L_V$COFF$
G18 G40
VERSCHIEBUNG("OFF")
M_V$K$09 M_V$K$55
L710(1)
NN9999: M17

Here is a screen capture of what it looks like the attachment.

[cogsman1]

NOTE!!!!
DO NOT use a "Y" axis command for your turret unless you enter milling interpolation FIRST or you could damage the index mechanism. Even "Y0" will do this unless you have the newest version of software in the control.
Been there, Done that and paid dearly!