User Guide

DesignRules:Restringsetting
The diagram illustrates the template for setting the width of the residual
ring. The standard value for the restring around holes is 25% of the hole
diameter. Since the width of the ring on small holes specified this way
would soon fall below a technically feasible value, a minimum value (10
mil in this case) is specified here. It is also possible to specify a maxi
-
mumvalue.
Example:
The ring around a hole with 40 mil diameter is 10 mil (25%). It there
-
foreliesinbetweenthemaximumandminimumvalues.
If the hole is only 24 mil in diameter (e.g. for a via), the calculation
yields a restring value of only 6 mil. For a board made in standard tech
-
nology this is extremely fine, and cannot easily be made. It might well
involveextracosts.Inthiscaseaminimumvalueof10milisgiven.
If you like to define a restring with a fixed width, use the same value for
minimumandmaximum.Thevalueinpercenthasnoeffectinthiscase.
Set the checkboxes Diameter, and the via/pad diameter will be taken into
consideration for the inner layers. This can be of interest if a pre-defined
pad or via diameter exceeds the calculated value. Otherwise the pad or
via in the inner layers would be smaller than in the outer layers. If you
want pads/vias to have the same diameter in all layers, set the option
Diameter.
The option is set off, by default, for new created boards, but will be set
on for boards that are updated from version 3.5 or prior because in these
versions pads and vias had the same diameter in all layers. Thus the up
-
dateprocessdoesnotchangetheoriginallayout.
Allthevaluescanalsobegiveninmillimeters(forexample0.2mm).
94
EAGLEManual