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2.8.3 Holder Definition<br />
A holder can be a stationary or rotating device<br />
that connects the tool to the machine. In the case<br />
of complex tool assemblies, a holder can be<br />
connected to another “parent” holder, which in<br />
turn is connected to the machine or to another<br />
holder, and so on. VM supports two types of<br />
holders:<br />
Using <strong>Virtual</strong> <strong>Machine</strong> Models with CeRun and Gener<br />
Adding Tooling Definitions to the Simulation<br />
� A Profile holder is one that is defined as a<br />
surface of revolution. The profile is defined<br />
in terms of its radial and axial offsets<br />
along the machine‟s tool axis. This<br />
simple 2D profile is then swept in a complete<br />
360° arc to create the final tool holder<br />
shape.<br />
� A Generic holder is any fixed device that<br />
holds the tool and/or the tool assembly.<br />
For example, this can be a simple holding<br />
bar for turning applications or a complex<br />
right-angled head assembly for milling<br />
applications. The generic holder body is<br />
constructed by importing, positioning,<br />
aligning and defining material properties of one or more STL objects in the exact same<br />
way as is done for part, fixture and stock components (see “Adding Parts, Fixtures and<br />
Stock to the Simulation” on page 18).<br />
A holder definition includes two contact points that define how holder is connected to the<br />
machine and the tool, or to other holders:<br />
� The SCP is the spindle contact point, which is the reference point on the holder that<br />
aligns with the gage point of the spindle or with the TCP of the parent holder. A profile<br />
holder‟s axis is aligned with the axis of the spindle. A generic profile holder‟s xyz reference<br />
frame is aligned with the xyz reference frame of the spindle.<br />
� The TCP is the tool contact point, which is the reference point on the holder where the<br />
top of the cutting tool body is attached (extending downwards). For generic holders you<br />
can also define the orientation of the tool at the contact point, in terms of its X-axis, Yaxis<br />
and Z-axis rotations.<br />
Select the “internally geared” option on the generic holder dialog when a generic holder represents<br />
a head assembly. This tells VM that the spindle force is transmitted through the holder<br />
from the SCP to the TCP points. You can also define a spindle ratio in cases where the gearing is<br />
not 1:1.<br />
<strong>ICAM</strong> Technologies Corporation – Proprietary 27
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