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23
THROUGH DOVETAILS
Chapter 8
D4R Pro User Guide
8-19
Before removing the routed board from the jig, check by
eye and touch to make sure no parts have been missed. Release
the clamp and reverse the tail board in the jig, keeping the same
inside face
i
away from the jig body.
Rout the other end of this tail board and both ends of the second tail
board in the same fashion, then unclamp and put them aside.
8-20
Rotate the finger assembly to the
d
TD PINS mode and
set it one scale increment more than the
1
⁄
2
"[12,7mm] mark
➀
.
Do not change the guidefinger layout.
1
1
8-21 How the TD PIN Scales Work
Dimensions inside the pin shaped panel
➀
correspond with the
diameter of the dovetail bit chosen to rout the tails
➁
. In this
example the
1
⁄
2
"[12,7mm] diameter of the #80-8 dovetail bit matches
the
1
⁄
2
"[12,7mm] setting on the scale. This also becomes the width
of the pin
➂
.
Dimensions in the central panel
➃
indicate which straight bit diam-
eter is required with the selected dovetail bit, i.e.
5
⁄
16
"[7,9mm]
straight bit with the
1
⁄
2
"[12,7mm],
7
⁄
16
"[11,1mm] and
3
⁄
8
"[9,5mm]
diameter dovetail bits.
The increment lines in the scale window
➄
are referenced to the
index lines on the support brackets when making fit adjustments.
Once the desired fit is achieved, settings can be recorded for precise
setup next time.
1
5
4
2
3
8-22 Finished Joint Tightness
The fit of the finished joint is determined in the
d
TD PINS
mode. Moving the finger assembly outward
➀
increases the width
of the pins
➁
, giving a tighter fit. Moving the finger assembly back-
wards
➂
allows more wood to be routed, making the pins smaller
➃
,
and the joint looser. A one increment movement changes joint fit
by 0.005"[0,125mm]. A one quarter increment movement changes
fit by a tiny 0.00125"[0,03mm]. Most importantly, when that
fine fit is achieved, it allows recordable and repeatable settings for
future joints using the same router and bits (see page 28).
Why can’t there be specific, preset scale settings for
each bit combination?
Cumulative tolerances in routers, bits, guidebushes and the dovetail
jig, make it impossible to give exact jig settings for a precision glue
joint. A fine fitting joint can only be attained by trial and error test
cuts, and takes only minutes for each bit combination. Dimension
lines on the TD PIN scale provides the starting point for testing.
2
4
1
3
Содержание D4R Pro
Страница 14: ...JIG ASSEMBLY MOUNTING AND USING THE CLAMPS 6 Chapter 1 D4R Pro User Guide ...
Страница 24: ...WOOD PREPARATION 16 Chapter 6 D4R Pro User Guide ...
Страница 86: ...BIT SELECTION 78 Appendix II D4R Pro User Guide ...
Страница 90: ...JIG PARTS 82 Appendix III D4R Pro User Guide ...
Страница 92: ...PRINTED IN CANADA Joining Tradition with Today Printed in Canada ...