configuring lathe problem stepconfig

ArcEye wrote:

Hi

It shows 3 axes because it counts X Y Z etc, that is normal, does not mean you have to use all of them and you have the correct coordinates set as X Z

It looks like you just need to change udir and ustep to zdir, zstep.

Do it in gedit not stepconf or you risk messing up an otherwise OK config

No idea how the names got that way to start with

regards

EDIT

Attached is an altered copy, try that, can't immediately see anything else wrong with it

cmorley wrote:

What version of linuxcnc are you using? master?
U and V axes were added recently and there may be a bug.

Chris M

Would you mind giving me a sample G76 line of code for say a M10 x 50mm so I can do further tests then I can learn how to program it. I use mm for the lathe.

;; Threading with G76 

;; Speed of 300 is stable and only requires F450 to cut 1.5mm thread
;; P[itch]
;; Z[FinalExtent] - Ensure there is an overrun element so that deceleration happens beyond end of thread, 3 mm sufficient in this example
;; I[ThreadPeakOffset - cant be 0, neg for external pos for internal, if diameter is critical you can add PeakOffset to Diameter to negate this value]
;; J[FirstCutDepth - positive offset]
;; R[DepthDegression 1.0 is constant depth 2.0 is constant area 1-2 depth decreases & area increases 2> area decreases]
;; K[FullThreadDepth positive offset beyond I for root of thread]- Q[CompoundSlideAngle eg 29.5] 
;; H[SpringPasses at full thread depth] E[TaperAmount in units - normally 0] L[Taper- L0 None L1 entry L2 Exit L3 Both] 

#<_Diameter>=40
#<_Z_LeadIn>=15
#<_Pitch>=1.5
#<_Z_Finish>=-15      
#<_PeakOffset>=-0.001
#<_First_Cut_Depth>=0.01
#<_Depth_Regression>=1.0
#<_ThreadDepth>=1.5
#<_CompoundSlideAngle>=0
#<_Spring_Passes>=2
#<_TaperAmount>=0
#<_TaperType>=0

#<_Feed>=1.5
#<_Speed>=300

G18 G21 G40 G49 G54 G80 G95
G90 G7
M101 P3 (SET PULLEY SETTING 3 FOR GOOD TORQUE)
F#<_Feed> S#<_Speed>
M3
G4 P10
M7
        (GO TO OS DIA AND Z LEAD IN 
G0 X#<_Diameter> Z#<_Z_LeadIn>
G76 P#<_Pitch> Z#<_Z_Finish> I#<_PeakOffset> J#<_First_Cut_Depth> R#<_Depth_Regression> K#<_ThreadDepth> Q#<_CompoundSlideAngle> H#<_Spring_Passes> L#<_TaperType>
G00 X45

M9
M5

G28

M2

if you reverse the spindle say 10 revs the go forward again the thread does not start again until the 10revs have been done.

Would I be better off with a 100 slot disc (mine is 64 slot)?

ArcEye wrote:

Would I be better off with a 100 slot disc (mine is 64 slot)?

You might well be.

I have a 120 hole disc on mine, which was the limit of the number of 3mm holes with 3mm spacing I could get on the disc.
I prevoiusly had a 60 hole version and this is much smoother.

I just have an A and a Z, no B. I don't want to do rigid tapping and as all threading is done in the same direction, B was no advantage.

regards

I have read some ware "The advantages of using both A and B are increased noise immunity and increased resolution"