Nautilus can also calculate how the steel dimensions of a mold need to be adjusted so that the parts can hit the nominal dimension
. The software has built-in worksheets for the various scientific molding studies, including viscosity curve, cavity balance, pressure drop, cosmetic process window, gate seal and cooling time.
By controlling the line speed or extruder RPM, the product parameters are adjusted to the nominal dimension
. The typical return time (ROI) for the investment is 6 to 8 months, the company adds.
Figure 1(a) shows an assembly of ten components with identical nominal dimension
, in which the component parts are put together circular structure.
Increases in dimensional variability can be expected to cause a slight increase in expected tool life, while nominal dimension
shifts within customer tolerance limits have a stronger impact.
Adding half the dovetail width to the .433 dimension, we get a nominal dimension
of .620 inch.
If the designer created a valid solid model, then every detail and nominal dimension
are available to the programmer without looking for drawing dimensions.
The 2 x 4 dimension is the nominal dimension
and is used when the product is sold.
The blocks have a nominal dimension
of 8 x 8-in., which means that the actual block is a bit smaller.
The critical dimension on the part print is given as 4.941 [+ or -] 0.008 in., and the actual mold shrinkage value for a part molded to the nominal dimension
is 0.02197 in./in.
As input data we have the measurement results of a 50 parts batch, the nominal dimension
and the lower and upper deviations limits of the tolerance field.
Both dimensional variability and nominal dimension
of the star test casting fin thickness were analyzed as a function of clay content, pouring temperature, sand compactability and shakeout time.
An increase in shakeout time increased the nominal dimension
across the parting line and in the drag.