Porter-Cable Jig Saw instruction manual Tenoning JIG USE

5.The tenoning jig features a positive stop to ensure fast and accurate positioning of the backstop (G) Fig. 21 at 90 degrees to the saw table. To check and adjust the positive stop at 90 degrees, loosen lock handle (H) Fig. 21, and place one end of a combination square (J) on the saw table and the other end against backstop (G). If the backstop is not 90 degrees to the table, loosen the locknut (K) Fig. 21, and tighten or loosen the adjustment screw (L) until the head of the screw contacts the casting on the vertical plate (M) at 90 degrees. Tighten the locknut (K) and lock the handle

(H).

M

J

H

Fig. 21

G

L

K

6.To eliminate chip-out when performing cheek cuts, you can fasten an auxiliary wooden backup board (P) Fig. 23 to the backstop (G) Fig. 22 with two wood screws through the two pre-drilled holes (N).

7.You can also fasten a block of wood to the vertical support plate (R) Fig. 23, through four pre-drilled holes (S) to prevent the saw blade from contacting the jig.

G

N

Fig. 22

P

R

S

Fig. 23

TENONING JIG USE

This jig is intended to perform cheek cuts only. Cheek cuts are made prior to the shoulder cuts, which are made on a table saw using the miter gauge.

Keep your hands on the jig handles when performing cuts.

Disconnect Machine from

Power Source

STRUCTURE OF A MORTISE AND TENON JOINT

Parts of a simple or “blind” joint are (Fig. 24):

A.Structural Shoulder

B.Cheek

C.Cosmetic Shoulder

D.Mortise

E.Mortise Walls

Lay out the mortise and tenon on the workpieces (Fig. 25), but keep these items in mind when laying out the joints:

•To avoid premature joint failure, avoid locating a tenon in a disfigured part of the grain (a knot), for unpredictable movement of the joint may occur. Use straight, flat, common-grained stock.

•The tenon will shrink in width away from the mortise walls, possibly revealing the mortised hole. When possible, produce tenons with shoulders on all four sides - two structural and two cosmetic - to conceal the mortised hole when wood movement occurs.

D A

C

E

B

Fig. 24

Fig. 25

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