The accuracy that can be achieved
in fineblanked parts is largely dependent on:
- The accuracy of the tools and their quality
of maintenance
- The quality of the raw material
- The thickness of the material
- The complexity of the component’s
shape
Tolerances are generally in the range of a .001 to .005 inches.
Caution: The following table should be used
as the engineering limit of the Fineblanking process. It assumes
perfect tooling, excellent cold rolled mild steel material,
and a non-complex part geometry.
In the real world, these values need to be adjusted
for high carbon steels, stainless steels, and complex part
geometries. A good place to start is two times these values,
and you will be very safe at three times these values.
 The
following tables use the ISO 286 system of tolerancing. If
this is unfamiliar to you, there is an excellent treatment
at www.roymech.co.uk ( under shaft tolerances). If you do any
work with fits (slip fit, force fit, etc.) this system will
save you a ton of work. But it is not necessary to understand
the system to use the tables, but that is where IT7, IT8,
etc. come from. Now on to the tables.
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Fineblanking
Accuracy
