Locating Clearance Holes on Custom Heater Bands
by Part Feature and with Degrees or Clock Time
If hole location cannot be determined in degrees, then measurements should be made on the inside surface of the heater. (A) From the edge of gap to edge of hole or (B) from the edge of gap to the centerline of hole.
When a hole is on the centerline of the width of a heater the maximum hole size can be determined by subtracting 3/4″ from the heater width.
When a hole is offset to one side of a heater there must be a minimum of 3/8″ clearance from edge of hole to edge of heater on one side of the hole
Holes should be located in degrees or clock time if possible, this will allow for the correct placement of holes. Note: Every minute on the clock is 6°.