Leigh FMT PRO Guide

JIG ADJUSTMENTS
FMT PRO Appendix II
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Jig Adjustments
A2-1 Clamp Plate The Clamp Plate is factory set square to
the table ➀. However, this does not guarantee perfectly in-line
joints. If your router shaft and bit are not perpendicular to the
router sub-base and the Leigh Sub-Base, then the bit will not be
square to the Jig Table (nor parallel to the Clamp Plate). This will
cause a tiny “step” in the joint alignment ➁. This is because the
tenon center mark is now offset from the mortise center mark in
the assembled joint ➂. For clarity, the angle and step in this example
is highly exaggerated.
90˚
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A2-2 Check your test joints for alignment with a straightedge.
The cross represents the inside face toward the clamp face.
The left example shows the clamp plate should be adjusted in
toward the jig body ➀. The right example shows the clamp
plate should be adjusted away from the jig body ➁. Test and
adjust the Clamp Plate angle (see A2-3) until the workpieces are
in the same plane, with no joint misalignment.
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A2-3 The adjusting screw for setting the clamp plate is in the
lower center of the plate. Loosen the quadrant knobs. Use the hex
screwdriver to turn the screw counterclockwise to move the plate
in ➀. Turn the screw clockwise to move the plate out ➁. The screw
is treated with Loctite™ to prevent accidental rotation. When the
clamp plate is square, re-zero the angle indicator if necessary ➂.
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A2-4 Joint Alignment The Clamp Plate is precision-set parallel
to the table at the factory and should never need attention. However,
if it should need adjustment, here’s how. First, loosen the two quadrant
knobs and tilt the Clamp Plate up approximately 1/4" and re-tighten
the knobs. Then slightly loosen the three screws holding the right end
quadrant using the square drive screwdriver ➀. Use the hex driver to
turn the setscrew in this hole ➁clockwise to move the right end of the
Clamp Plate in toward the jig ➂; counterclockwise to move it out ➃,
then tighten the quadrant screws ➀. The adjusting screw is 28 pitch;
one turn is 0.036"[,9mm]. That’s a lot. If adjustment is ever necessary
it will likely be a small fraction of a turn.
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Appendix II Frame Mortise & Tenon Jig User Guide JIG ADJUSTMENTS
A2-5 Table Clamp Setting The setting for this is factory pre-set
using a torque tool. Should you need to adjust the pressure, lock
the table and lightly tighten the two clamp screws equally ➀. Do
not adjust these screws with the table unlocked. You should be
able to work the table lock lever with quite light pressure. When
locked, it should not be possible to move the table with firm side
to side hand and arm pressure. When unlocked, it should be easy
to position the table without sticking. The screws are treated with
Loctite™ to prevent accidental rotation.
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1
A2-6 Sight Position The sight position is factory set. If you
ever need to reset it here’s how. Clamp a straight vertical rail that
projects through the table bit opening ➀. Slightly loosen the
four small hex cap screws that hold the two sight rails ➁using
the provided hex key. Move the table forward until the rear edge
of the bit opening ➂firmly touches the vertical rail ➀, and lock
the table. Pull the sight and rails against the wood piece ➃; at the
same time centring the rear end of the sight in the recess.Tighten
the four screws.
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A2-7 Jig Maintenance Very little maintenance is required. Fine
dust build-up in the front and rear sight stops should be removed
from time to time. The end of the small hex key or a piece of wire
will do the trick. At the front ➀and with the sight to the rear
position at ➁. Dusting off with compressed air (if available) will
keep the jig clean.
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A2-8 The sidestop fence is squared at the factory, but check your first
test joints. If your router/bit is not perfectly perpendicular to the table
adjust the sidestop fence: slightly loosen the 'pivot' screw ➀and the 'lock'
screw ➁. Adjust the angle ➂to match the bit and retighten. Rout test
joints to confirm correct setting. Once locked in this position it should
never need adjusting when used with that same router. ■
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