KFlop Single Point Threading

[netboss]

I am considering a 2nd KFlop for use on my newly converted CNC lathe. What is the current status of single point threading on the KFlop? My lathe currently has steppers, 3hp motor, VFD and 100 ppr quadrature encoder, but no index pulse.

Similar Threads:

• Single point threading 4140
• single point threading 304ss
• Single point threading (lathe) with EMC
• Single point threading
• Single point threading

[kn6za]

Works great on my lathe, and you can engage the threading with spindle off, rotate spindle by hand and the z axis will slave along so that you can line up with an already cut thread that needs to be cleaned up or re-cut. Its great.

M4 threading works now too.

No need for index pulse one my machine, just quadrature encoder.

Andrew

[TomKerekes]

Hi netboss,

Here are some User videos:





An index pulse is not needed. That just means that the Spindle 0 degree point (where the Spindle synchronized motions will begin) will be arbitrary depending on how the Spindle is oriented on power up or when the Spindle Position is reset. Normally the start position of a Thread doesn't matter as long as it is consistent from pass to pass.

HTH
Regards

[mmurray70]

Tom is there a way to reduce the amount of lead off at the end of threading? Or lead in in the first video. Kinda looks like if you were threading up to a square shoulder you would end up with a fair bit of a gap not threaded.

[TomKerekes]

Hi mmurray70,

I'm not exactly sure what you mean - but the motion path and feedrate can be programmed in the GCode. It looks like that code does a 45 degree angle to ramp out as in our example. The Ramp out at 1.4142X Feedrate keeps the pitch in the Z dimension the same while moving both Axes. Probably not so useful but moreso to show what is possible.

The path:



The Code:

G20
G43H2001
G0 X0.8 Z3
M3S100
M100
G00 Z3
(Pass1)
G00 X0.49
G32 Z2.3 F0.1
G32 X0.69 Z2.1 F.14142
G00 X0.8
G00 Z3
(Pass2)
G00 X0.48
G32 Z2.3 F0.1
G32 X0.69 Z2.09 F.14142
G00 X0.8
G00 Z3
(Pass3)
S75
G00 X0.47
G32 Z2.3 F0.1
G32 X0.69 Z2.08 F.14142
G00 X0.8
G00 Z3
(Pass4)
S200
G00 X0.46
G32 Z2.3 F0.1
G32 X0.69 Z2.07 F.14142
G00 X0.8
G00 Z3
(Pass5)
G00 X0.45
G32 Z2.3 F0.1
G32 X0.69 Z2.06 F.14142
G00 X0.8
G00 Z3
M30

Regards

[mmurray70]

Ok yes i see how it works now. So the ramp can easily be made smaller or even a different angle. Good to know. Thanks.