The trials and tribulations of a machinist just starting out with out any experience. This can be an overwhelming time for anyone. First thing is never trust a programmer or another machinist to tell you something is right. God gave you a set of eyes and a brain to use! So use them and check for yourself. Keep your rapid overrides on crawl till you know the program and moves are correct. Always pick up your tools, sounds simple well it is there is no magic here. Touch off the insert to either a part setter or the part in the z move which is horizontal. If there is a difference in length simply face the part till it cleans up measure the lenght then subtract to the length you need and type in z (whatever the difference ie:z.05). X is about the same get the part to clean up measure the id or od and put it in your work offset. When all tools are done back them off and run slowly watch your moves. Don't get me wrong there is alot more to machining than that but so not to confuse or scare you i'm keeping it simple. You have to have good math skills or be able to use a calculator and measuring skills. Learn the feeds and speeds of the tools and parts you are running and look at the print to see what finish you need and learn to adjust accordingly. As far as boring a new set of jaws learn to write and use can cycles makes it simple from starting size to finish size. As far as setting jaws already bored try to use the MDI and write a simple program. Make sure on a lathe you are on the head you want to use keep your overrides on crawl. The program is got0101 then the x move of the outside diameter of the part. (ie:x3.144).
Go is a rapid move and t0101 is the tool and offset you wish to use. no magic there either. Then put it on hand mode in z and move in to where the jaw sits barely off the inset tighten them up then to bore you already have the size you need so put in a chucking ring and bore them.
From Chris Hartman
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Chris brings up a good point on his post if you are just starting to learn how to operate a CNC machine. From the sounds of it he is talking about a CNC Lathe. A CNC machine has on it a control that allows you to set the traverse rapid movements of the machine and take a fast moving turrent and change it so it just crawls along. Whenever you set up and run a new job on the machine it is always in eveybodys best interest to run things slow at first to work out any bugs in the program and to give yourself a chance to stop the machine before it wrecks. Starcire
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