You can put a .625 tool blank in and touch off on the side of the bar then wind over half diameter to set centerline then add/subtract the shadowgraph measurement from there. You could even turn the bar for more accuracy.
Also. If you need to change your Preparation page data, you can use the [ABS] soft key, then if you apply a value, it will change your Data to that value without adding or subtracting (hence ABSolute)
That’s not necessarily true if you don’t have a comparator or a shadow graph, you can very easily set a Turning tool and face off under center, once you get a nipple you can measure your nipple with a Micrometer, once you achieve a value you can make an offset appropriately (Y axis is sometimes radial, not diametrical so make sure to check that) and then take it out, measure the thickness differential and change your offset to that value.. now you have a threading tool set in Y axis, without a comparator or shadow graph.
You can measure from the face that mounts against the gang to the leading edge of the insert, or from the leading side of the holder to the leading edge of the insert if you're using a turret style machine. That will just be a 1:1 adjustment with a z offset or work shift.
Your Cut-off/Part-off shift will be from the INSIDE cutting edge, to the shank, and then minus any face-off amount (I like to use 0.0100) that will be your initial G50Z shift, then when your tool calls the Z axis to machine, it will shift that amount.
@h0mbsk yes. Cutoff width minus insert width minus facing amount. For 1/2" tools with 3mm blades the shift is usually G50 W.370. For 5/8" cutoffs, it's usually G50 W.525. then call G0 X#814+.1 Z0 to position next tool.
Thanks to all answers! I think i got it now. My machine center of my Traub tnl12 is somewhere behind the guide bushing. It was difficult to Set the correct Tool coordinates on Z without ending up at Spindle Software ends.
Great content guys!!!!
You can put a .625 tool blank in and touch off on the side of the bar then wind over half diameter to set centerline then add/subtract the shadowgraph measurement from there. You could even turn the bar for more accuracy.
Yes! This is good. That’s a machinist right there!
Also. If you need to change your Preparation page data, you can use the [ABS] soft key, then if you apply a value, it will change your Data to that value without adding or subtracting (hence ABSolute)
That’s not necessarily true if you don’t have a comparator or a shadow graph, you can very easily set a Turning tool and face off under center, once you get a nipple you can measure your nipple with a Micrometer, once you achieve a value you can make an offset appropriately (Y axis is sometimes radial, not diametrical so make sure to check that) and then take it out, measure the thickness differential and change your offset to that value.. now you have a threading tool set in Y axis, without a comparator or shadow graph.
Hey guys! Thanks for making these great Swiss lathe videos! How do you find the Z axes coordinates for the Tools? Greetings from Berlin Germany
You can measure from the face that mounts against the gang to the leading edge of the insert, or from the leading side of the holder to the leading edge of the insert if you're using a turret style machine.
That will just be a 1:1 adjustment with a z offset or work shift.
I do cut off - start pos - G50 shift to Z0.0
then bring each tool down and touch off on front of bar and set longitude.
Your Cut-off/Part-off shift will be from the INSIDE cutting edge, to the shank, and then minus any face-off amount (I like to use 0.0100) that will be your initial G50Z shift, then when your tool calls the Z axis to machine, it will shift that amount.
@h0mbsk yes. Cutoff width minus insert width minus facing amount. For 1/2" tools with 3mm blades the shift is usually G50 W.370. For 5/8" cutoffs, it's usually G50 W.525. then call G0 X#814+.1 Z0 to position next tool.
Thanks to all answers! I think i got it now. My machine center of my Traub tnl12 is somewhere behind the guide bushing. It was difficult to Set the correct Tool coordinates on Z without ending up at Spindle Software ends.