Correct encoder count for lathe back tool

I am trying to sort out which way the encoder count should go + or - when using the spindle in reverse for threading i.e. the tool is at the back.The code is hanging waiting the the spindle true I think. I have tried it with M3 and M4 I am using a slotted 100 slot disk with A B Z

G0 G40 G18 G80 G21 G49 G95
G90 G7
F1.5 S470
M4
G4 P1
(Change the fist X to the Dia P = the Pitch K = Thread depth)
G0 X10 Z10
G76 P1.5 Z-12 I-0.1 J0.1 R1 K1.5 Q29.5 L0 H1
g0 X30
g0 Z50
M5
M2
%

As I am still waiting for some sensors to arrive for the Boxford 125 I thought I might be cheeky and bump this.

I am not sure which way the encoder count should go as the spindle has to go CCW as the tool will be at the back for threading.

I'd guess you might have a problem with the spindle-at-speed signal

I'd also guess encoder counts up (positive) for cw rotation (SIM lathe configuration agrees)

Chris

cmorley wrote:

I'd guess you might have a problem with the spindle-at-speed signal

I'd also guess encoder counts up (positive) for cw rotation (SIM lathe configuration agrees)

Chris

Yes It now works

Had to set the encoder scale to 100 (100 slot disc) and setp spindle.0.at-speed true

Next job is the get the spindle speed display with the correct speed.

A note for others when threading Threading works very well BUT you have to make sure that the axis can move at the rate the spindle is turning. Ie. if the spindle is at 1000 rpm the Z axis has to move in time with it and if it is clamped down by MAXVEL it won't thread correctly. So you have to thread at a spindle speed that the Z axis can achieve. Hope this makes sense.