Three hole drill/punch standard procedure.
A hollow drill bit used in a
paper drilling machine to produce 1 or more holes in paper stock placed between
the drill bit and drill table producing round holes 1/8", 1/4",
5/16" and 3/8" Dia. Drilling often produces edges that are dimpled and
adjoining sheets that are stuck to each other at the drilled hole. Very flexible
between hole and hole to paper edge positioning.
A solid punch pin and mating
die placed in a punching machine used to cut out the material placed between the
punch pin and die in many shapes and sizes. Punching normally produces clean cut
edges with less sticking at the hole. Limited hole positions. Generally a higher
quality hole than drill.
3-Hole drilling is often used
to mean either punching OR drilling. Normally paper stock or paper stock with
light coatings is drilled. Heavy plastic stock, heavily coated paper stock or
paper requiring quality higher than drilling is punched.
The position of the holes in
stock is determined from a customer-supplied sample. In the event the customer
instructions are "Use a standard" hole and pattern we must advise them
there is not a standard that applies to all jobs.
We have adopted the following
as SGM Bindery standards when the customer has signed off on preparing a
customer sample for holes.
5/16" Dia holes (either
drilled or punched at our discretion) located within the book such that the
holes do not break into the binding hole or glue. This could put the center of
the 3-holes as much as 1/2" or more into the book as measured from the bind
Loose leaf book materials:
A hole pattern 4.25"
between hole centers with a 1/4 or 5/16" Dia hole placed 5/16 to 3/8"
to center of hole from spine edge of paper, similar to the holes punched on a
"Punchodex No. P-39" office supply 3-hole punch.
As always, SGM can provide sample material.