Position roller frame so that the handle is facing the operator in a horizontal position. Seat panel, painted side outward, placing a piece of #1 Kraft brown paper, substrate 30, between the finished surface and the roller. Clamp panel and the protective wrapping in position by means of the three wing nuts so that one panel edge is in line with small end of conical mandrel.

Panel is then formed around mandrel by rotation of the roller frame from front to back. The action should take about 15 seconds. To remove panel, return the roller frame to front position and loosen wing nuts, then lift panel upward from conical mandrel. Examine bent surface of panel for cracking. Mark end of crack farthest from small end of mandrel. This is considered the end point. To determine percent elongation of finish refer to Specification ASTM D522.

ASTM Designation D522 calls for a cone with a diameter that increases from 1/8" to 1-1/2". It states that panel thickness not exceed 1/32", and 1/64" panels are preferred for routine test work. When bending panels, the strain on the 1/8" end of the cone might be sufficient to break the cone tip. This style conical mandrel (Model MN-CM-ASTM) is not guaranteed to bend panels thicker than 1/32" without
the possibility of cone tip damage.