VERITAS Mk.II, Руководство пользователя

Страница: 19 / 70

13
General Principles – Straight-Edged Tools: Chisels and Planes
Tool Holding
Standard Projection
Use of the tool holder at the standard projection is covered
in
Chapter 4, Step 2: Create the Primary Bevel .
Short Projection
Some tools such as short butt chisels, spokeshaves and
small palm planes have blades that are too short to
register properly at standard projection. Blades as short
as 1
1
/
2
" may still be sharpened using the short setting
of the blade projection jig. As shown in Figure 12 and
on the label of the blade projection jig, when the short
projection is used, the angle as displayed on the tool
guide is no longer correct. The conversion can be made
using the table pictured on the jig label.
When working on wide, short tools, such as butt chisels
or spokeshave blades, it is often easier to ensure square
registration using the existing edge against the registration
jig rather than the side of the blade and the shoulder of the
tool holder. If the dull edge is out of square, the human
eye (aided with a small square) can usually correct to
obtain the set-up as square as it needs to be.
Be aware that it is not possible to use the 15° setting
on the tool guide when sharpening a chisel at the short
projection. To attempt this would cause the underside
of the tool holder to come into contact with the abrasive
platter. This is due to the thickness of the blade to
be sharpened and applies to chisels only. It is not a
restriction, as short chisels (butt or Japanese) cannot
normally withstand such a low bevel angle. Small
plane blades such as for spokeshaves and palm planes
are much thinner and may be sharpened at 15° with no
interference.
As noted on the Blade Projection Jig Label , when using
short projection do not set the tool guide to 40° or 45°.
Using such a combination of settings will create a bevel
angle of 52° or 59° which, aside from being unusable
cutting angles for woodworking, may cause the tool to
jam between the turntable and tool guide when taking
a leading cut. If for some reason such an obtuse angle
is necessary, it may be accomplished by using a trailing
cut as shown in
Figure 21 .
Skew Chisels
The tool holder is equipped with two registration
screws that are normally stored out of the way in tapped
holes on the top of the holder. These are for use with
skew chisels. When used as shown in
Figure 13 , they
will allow the user to hone a 60° point (30° skew) on
a
1
/
2
" wide chisel. If sharpening a
3
/
4
" wide, 30° skew
chisel, set up as shown in Figure 14 . Use one screw if
sharpening a 1 " wide skew as shown in Figure 15 .
Figure 13: 1 /
2
" skew chisel.
Figure 15: 1 " skew chisel.
Figure 14: 3 /
4
" skew chisel.
! = DO NOT USE
(SEE MANUAL)
!
!
Figure 12: Blade projection jig label.
Contact
Contact
Contact