|
Tip
#22
Horizontal
Boring In Woodworking
(continued)
Click
here for a printer friendly
version of Tip - Pg. 1-3, Pg
4-6, Pg. 7-9
Concentric
Boring
A round
or a square workpiece, if it is not too long, can be positioned
for accurate concentric holes by using the miter gauge and
the fence as shown in Figure
11-17. The table height is adjusted so the drill point
will be on the workpiece's horizontal centerline. The miter
gauge, locked in place, maintains the workpiece's alignment;
the fence serves as a backup.
 |
|
Figure
11-17. A simple way to set up for boring concentric
holes.
|
 |
|
Figure
11-18. A V-block can also be used when doing concentric
boring.
|
 |
|
Figure
11-19. A V-block is used to hold the workpiece as
shown here. Use the fence as a stop block and use a
spacer when the workpiece is too short to reach the
fence.
|
Another
method requires the use of a V-block (Figure
11-18) which cradles the workpiece as demonstrated in
Figure 11-19.
When the workpiece is shorter than the V-block, use a length
of scrap wood between the workpiece and the fence. The V-block
can also be used to hold square workpieces (Figure
11-20).
 |
|
Figure
11-20. The V-block can also be used to position
a square workpiece for concentric boring.
|
 |
|
Figure
11-21. An extension V-block is used for extra-long
workpieces.
|
For extra-long
workpieces, use an extension V-block as shown in Figure
11-21. The V-block is also used to grip short workpieces
(Figure 11-22).
The V-block, held in place by being clamped to the locked
miter gauge or clamped to the extension table, is positioned
so the vertical centerline of the spindle bisects the “V.”
Table height is adjusted in relation to the diameter of the
workpiece. Small auxiliary V's are used when the workpiece
is too small to be gripped by the basic V-block. Figure
11-23 shows how the extension V-block and the auxiliary
V's are made.
 |
|
Figure
11-22. The extension V-block can also be used to
grip short workpieces. Auxiliary V's are used when the
stock's diameter is too small to be gripped by the basic
V-block.
|
 |
|
Figure
11-23. Construction details of the (A) extension
V-block and (B) the auxiliary V's. The shape needed
is actually a rabbet cut.
|
Continue
to Boring Extra-Deep Holes
Back to Pivot Boring
|
