work-shifting cutoff tool on a swiss starsr20

[jeff88]

I am cutting .125 dia stock with a short part length.So I am forced to use a left handed cutoff tool.I use a right handed cutoff tool to qualify a new bar,so the stock will not snap off.But after I cut a finished part off,my g50 tool shift(width of tool to inside edge of insert),brings up the stock short on my next part,after the head resets to its working position.I am running a star sr20. Do i need to shift the qualifying tool the same distance?..and waste stock?..Or am I having a brain fart? Its been a long day

[bl409]

If you are facing a new bar with a right hand tool you should not need a shift as the end of the tool should be at Z zero. BL

[L20/M32]

Does your G50 at the beginning of the program match your start position at the end of the cut off cycle?

[cogsman1]

I think I understand your problem.
AFTER you change bars and qualify the stock with the right hand tool the program begins again but the G50 is out out for the left hand tool.
You will need to add some code to get the stock out to where the left hand tool would have it at the normal end of program. You could do another cutoff just skimming the face of the stock with the left hand tool or, to not waste time, just pull the right hand tool up and shoot the stock out whatever the distance is from one tool tip to the other. Keep in mind when you "re-position" for the new part you may want the tool in front of the stock to prevent movement.

Block skip to only run when new bar is loaded. This is how it would work on a Citizen control.
M8
/M98P#### (Bar-change)
/G0X.9T0
/T#### (INDEX TO LEFT HAND TOOL)
/G0W.### (RAPID STOCK OUT)
/G1X-.08F.002 (POSITION TOOL IN FRONT OF STOCK)
M9

continue with end of program.

[jeff88]

Thanks Cogsman...I think I have it figured out..Simple Z positive and negative confusion.Shifting the head back the amount of the total part length including cutoff,to the facing position.I ended up using the sub to grab the remnant,eliminating the right hand cutoff.To make matters worse,I'm not able to hold the bar in the bar feeder.The bar feeder collet twists up the stock.So my stock was slipping in the bushing when the head shifted back.I have to keep the bush tension loose to prevent marring the finished stock.Made up a barpull to grab the stock as the head retracted....