Rule

Note:   The following is a tip to use while making your planing forms.

There is a technique used by mold makers of plastic injection molds and die blocks to determine cavity shape as their work progresses.  They keep a small amount of modeling clay handy which they press into the cavity and then pull out to examine the resultant imparted shape.  This clay might be used to check the evenness of 60° groove filing as it progresses.  You would be able to check a few inches at a time to see that the groove bottoms are even from one steel bar of a pair to the other.  There are plasticized clays that do not dry out. (Phil Fentress)

Rule

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