Powermatic PM15, Инструкция по эксплуатации и каталог запасных частей

Страница: 17 / 40

17
Introduction to Molding
Pattern Knives
Custom molding knives are ground from high
speed hard steel. Your PM15 planer-molder will
accept a single knife set, which uses gibs and
counterbalances to ensure the cutterhead is in
balance at all times. See Figure 24. It will also
accept a three-knife set.
The three-knife molding set allows the planing
knives to remain within the cutterhead, as long
as the pattern knife is no more than 1/8” thick
and no wider than 3”.
Optional Bedboard and Guide
There is an optional bedboard with adjustable
guides offered as an accessory (#2253082). Or
a home-made bedboard and guide can be
made, as discussed below.
The use of a bedboard is highly recommended
and can be extremely critical in cases such as
custom pattern knives and molding bits where
they are designed to cut below the molding to
eliminate rough edges and to final size the
molding. In this case, the use of a bedboard is
mandatory in keeping the tips of the custom
pattern knives away from the cast planer bed.
Always use a bedboard with
a custom pattern knife, or damage to the
knives, planer bed and cutterhead can result.
Homemade Bedboard
A homemade bedboard can be made as shown
in Figure 25. Permanent guide rails are mounted
as shown.
Homemade Featherboard
For face molding, a homemade guide and comb
or featherboard can be combined to position
stock for desired pattern cuts. See Figure 26.
Select a straight piece of hardwood for the
guide. This piece should be 2” x 1/2” and at
least 27-1/4” long. The guide should be exactly
parallel to the milled edge of the planer bed. The
guide can be held in place with C-clamps. You
will have to cut clearances in the guide so the
guide will fit beneath the rollers.
A featherboard can be of great help in guiding
stock. It is quickly made from any piece of 1”
thick stock, approximately 8” long and 3” wide.
Saw the parallel slots about 4” deep and 1/8”
apart. The feather board can be C-clamped at
any position to exert a spring tension to hold the
stock against the guide.
Figure 24
Figure 25
Figure 26