6 Posts
Hello,
I am developing an eLearning course on locating program zero on the lathe. I understand that the Z0 is almost always located on the finished part face but could also be located elsewhere, such as on a chuck jaw or the chuck face.
Based on what I've found, placing Z0 on the chuck jaw or face complicates machining commands and requires the programmer and/or operator to account for leftover stock and possibly other factors. I am having trouble explaining the issue and what calculations would be needed as I can't find examples of anyone using this method. Does anyone have experience with this?
Any feedback is much appreciated!
I am developing an eLearning course on locating program zero on the lathe. I understand that the Z0 is almost always located on the finished part face but could also be located elsewhere, such as on a chuck jaw or the chuck face.
Based on what I've found, placing Z0 on the chuck jaw or face complicates machining commands and requires the programmer and/or operator to account for leftover stock and possibly other factors. I am having trouble explaining the issue and what calculations would be needed as I can't find examples of anyone using this method. Does anyone have experience with this?
Any feedback is much appreciated!
2 Replies
6 Posts
Thanks for the feedback! So it sounds like you would rarely, if ever, place Z0 in a location other than the part face. I came across mention of setting Z0 on the chuck in the sources below, and in a couple older CNC textbooks in our office, but no examples of people actually using it.
https://books.google.com/books?id=JNnQ8r5merMC&pg=PA112&lpg=PA112&dq=part+zero+locations+%22chuck+face%22&source=bl&ots=P_SBOQ_NsP&sig=ACfU3U0Uw6jKGNtIGdUvCEQyG_OLoiULAA&hl=en&sa=X&ved=2ahUKEwjNyNWwg4rjAhUILs0KHRsqDx8Q6AEwCXoECAcQAQ#v=onepage&q&f=false
https://books.google.com/books?id=ziU_rO5gcIEC&pg=PA169&lpg=PA169&dq=part+zero+locations+%22chuck+face%22&source=bl&ots=6TMJzSfHwT&sig=ACfU3U1e3evCouvoM7L7PrdKKOOfZDT5gQ&hl=en&sa=X&ved=2ahUKEwjNyNWwg4rjAhUILs0KHRsqDx8Q6AEwCnoECAkQAQ#v=onepage&q=part%20zero%20locations%20%22chuck%20face%22&f=false
https://books.google.com/books?id=JNnQ8r5merMC&pg=PA112&lpg=PA112&dq=part+zero+locations+%22chuck+face%22&source=bl&ots=P_SBOQ_NsP&sig=ACfU3U0Uw6jKGNtIGdUvCEQyG_OLoiULAA&hl=en&sa=X&ved=2ahUKEwjNyNWwg4rjAhUILs0KHRsqDx8Q6AEwCXoECAcQAQ#v=onepage&q&f=false
https://books.google.com/books?id=ziU_rO5gcIEC&pg=PA169&lpg=PA169&dq=part+zero+locations+%22chuck+face%22&source=bl&ots=6TMJzSfHwT&sig=ACfU3U1e3evCouvoM7L7PrdKKOOfZDT5gQ&hl=en&sa=X&ved=2ahUKEwjNyNWwg4rjAhUILs0KHRsqDx8Q6AEwCnoECAkQAQ#v=onepage&q=part%20zero%20locations%20%22chuck%20face%22&f=false
9 Posts
To locate program Zero on a lathe, face your stock and set the Z to 0.0.
Y 0.0 is the center of the spindle.
Program zero, or part zero, on a lathe is the center of the face of the stock.
On the lathe, Program Y 0.0 is the center of the cylindrical stock. All Y coordinates should be positive. The only time you will need a negative Y on a lathe is when facing, then you want to go -0.01 over to make sure you get the center nib off the part.
Z 0.0 is usually the part face and the numbers go negative towards the chuck, this way you know the tool is off the part if it is in a positive coordinate
Y 0.0 is the center of the spindle.
Program zero, or part zero, on a lathe is the center of the face of the stock.
On the lathe, Program Y 0.0 is the center of the cylindrical stock. All Y coordinates should be positive. The only time you will need a negative Y on a lathe is when facing, then you want to go -0.01 over to make sure you get the center nib off the part.
Z 0.0 is usually the part face and the numbers go negative towards the chuck, this way you know the tool is off the part if it is in a positive coordinate
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