Deskcnc Manual

Lathe Tool Length Offsets Explained CNC Services Northwest Introduction Each lathe tool has X and Z offsets, which serve to locate the tool tip with respect to some standard position. There are several ways to manage tool offsets on the lathe control. Which way is best for you will depend on your machine, your tool holding system, and the nature of your work. Some factors which will affect your choice of methods include: • Do you run multi-tool jobs? • Can you remove and reinstall tools without changing their locations? • Do you have enough tool holders to leave a basic set of commonly used tools in their holders all the time? • Do you have an automatic tool turret?

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First I will discuss some of the basic theory and concepts behind measuring and using tool length offsets, then I will list some recommended methods for managing your offset library, based on the preceding considerations. Theory and Concepts If at any point in this discussion your eyes start to glaze over, just skip down to the section. What are tool length compensation and tool length offsets?

Tool length compensation is a way for your CNC control to adjust for differences in length between different tools, without your having to worry about those differences in your part program. The control can adjust for tool lengths on request, provided it knows how long each tool is relative to some standard length (and therefore relative to each other tool). These relative lengths are called Tool Length Offsets or simply Tool Offsets. The Centroid control maintains two sets of tool offsets. The first set, displayed on the 'Tool Offset Adjustment' screen, is intended to hold wear offsets.

These values should all start out at zero, but may be adjusted plus and minus small amounts to compensate for insert wear or other factors. From the main screen press F1/Setup, then F2/Tool to get to the Tool Offset Adjustment screen. The second set, displayed on the 'Offset Library' screen, is intended to hold the larger geometry offsets. These values will be the difference between the tool tip position of each cutting tool, and the tool tip position of the reference tool. From the Tool Offset Adjustment screen, press F1/Offset Lib to get to the Offset Library. When a part program calls for a tool offset, the control adds the two offsets (geometry offset plus wear offset) together and uses the result.

Centroid measures tool geometry offsets by comparing each tool to a standard length. This standard length is the Reference Tool. In general, you load the Reference Tool, jog the X axis in until that tool touches some surface, and set the X Reference position there. Likewise you then jog the Reference Tool around to touch the end of the part, and set the Z Reference position there. The control memorizes these positions on each axis.

You then load each other tool, bring that tool in until it touches the same surfaces, and tell the control to measure the tool. You touch and measure each tool once for X and once for Z. The control compares the axis position with this tool touching the surface to the previously stored Reference position.

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The difference in positions is stored as the offset for the tool. Clearly, to touch the same surface with a shorter tool, you have to move the axis in further. This results in a negative offset. The shorter the tool, the more negative the offset. To touch the same surface with a longer tool, you don't have to move the axis in as far.

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This results in a positive offset. The longer the tool, the larger (or less negative) the offset.

To apply tool length compensation, the control simply needs to add the current tool's length offset values to all X and Z axis moves. For a short tool, adding the smaller (or more-negative) number causes the axis to move closer. For a long tool, the larger (or less-negative) number causes the axis to stay farther away. Centroid has traditionally recommended that your reference tool be longer than any other tool. This results in all your length offsets being negative. Doing this was never strictly necessary, but it did protect you against certain G coding errors. For example, suppose you wrote: N1 T0400; load tool 4 (at home, with no offsets applied) N2 G0 Z0.1 X1.2; rapid down to clearance position N3 T0404; turn on length compensation for tool 4 or, at the end of a cut: N48 G1 F.05 X.8 Z-1; make final cut at depth N49 T0400; turn off tool length compensation N50 G28; move to home If the X and Z offsets for tool 4 were positive, both of these examples would result in crashes.