CNC Tips & Techniques, Page: 1   2   3   4   5   6   7

CNC Tips & Techniques (p. 7)

Simplifying the task of jaw placement on three-jaw chucks

Most three-jaw chucks used on turning centers have a series of fine serrations on master jaws and top tooling that must be properly aligned when top tooling is mounted to the chuck. But by the nature of three-jaw chucks (jaws are 120 degrees apart), it can be difficult - if not impossible - to determine the exact diameter at which each jaw is being placed in the chuck. (Article)

Pallet Check for Mori Seike Horizontals

Im an applications engineer for a Mori distributor in the Northwest. I have written a macro for a pallet check on the Moris. Mori is kind enough to write the current pallet in the machine as a value in variable #147. I take advantage of this to make pallet checks at the beginning of a program to prevent programs from running on the wrong pallet. We assign these as M codes M71 for pallet A check and M72 for pallet B check. If the correct pallet is not in the machine an alarm will be generated. (Article)

DNC software that tracks cycle time and time that each tool is cutting

We've enjoyed your column in Modern Machine Shop for many years, and we've noticed that you frequently write about various ways to improve productivity by using Fanuc's Macro-B option. Our company has developed some software and macro programming techniques that may be of interest to you. (Article)

How can you tell if your control has Custom Macro B?

The most popular version of parametric programming is Fanuc's Custom Macro B. Many control manufacturers (including Haas, Mistubishi, Mazak, Yasnac, and Seikos) use Custom Macro B as their version of parametric programming. But for most controls, Custom Macro B is an option. It doesn't come standard with the control. However, many machine tool builders include Custom Macro B in the standard package of options they include with the machines they sell, especially if the machine has some special accessory like a probing system. (Article)

How the heck does G28 work?

G28, Fanuc's zero return command, tends to be one of the more misunderstood Fanuc programming words. The zero return position is, of course, the machine's reference position. A light (axis origin light) will come on for each axis that is sent to the zero return position. The zero return position is quite important: most programs begin from this location, most machines require that you (manually) send the machine to this position as part of powering up, and it's a point of reference for fixture offset (machining centers) and geometry offset (turning centers) entries. Admittedly, G28 is among the most complicated programming words. Here we attempt to clear up the confusion. (Article)

How to program a bar puller

There are three categories of turning work: chucking work, shaft work, and bar work. Turning centers vary when it comes to what kind of turning work they do best. There are turning centers that have been specifically designed for but one of these three categories. (Article)

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