A System for Automated Fixture Planning with Modular Fixtures
A System for Automated Fixture Planning with Modular Fixtures
A System for Automated Fixture Planning with Modular Fixtures
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28<br />
Friction <strong>for</strong>ce's magnitude and direction at a passive contact would be the same as those at an<br />
active cmtact.<br />
Note. that the above assumptions are made <strong>for</strong> a conservative analysis. Thus, a conservative fiction<br />
coefficient should be used in consideration of the material of the part, support or the base plate, or clamps.<br />
In a fixture. plan <strong>with</strong> a vise, the part and vise jaws has a s&e contact The surface contact area is<br />
conservatively estimated by a rectangle and approximated by 3 point contacts. Each contact is assumed to<br />
apply the same amount of clamping <strong>for</strong>ce. Details m idennfy the contact area between the jaw and the part<br />
are discussed in Chapter 4 Figure 3-10 shows the 2D <strong>for</strong>ce model of a fixture plan <strong>with</strong> 2 clamps.<br />
Y<br />
Figure 3-10: ZD <strong>for</strong>ce model <strong>for</strong>acurting face dindon parallel <strong>with</strong> the base.<br />
'Ihe problem is <strong>for</strong>mulated acwrding to the srandard <strong>for</strong>m of simplex method Faha 821:
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