A Frog is a central and integral part of iron / metal
bench planes
where most of the action happens, this includes the lateral angle of blade
position, the depth of cut and the finesse of cut.
The frog is used as the bed on which the plane blade lays. The bed angle
of a frog is usually 45 degrees.
A frog usually has three mechanisms for accurately adjusting the cut:
- Frog Adjuster Screw - a frog usually has a frog adjuster screw at the
base of the rear of the frog for sliding the frog forwards and backwards
to the desired position which in effect creates the mouth size.
- Lateral Lever Adjuster - the lateral lever on a frog is a long metal
rod / lever which lays behind and locates with the plane blade so when
the lever is moved side-to-side then the lever adjusts the blade laterally
(side-to-side).
- Blade Depth Adjuster - a frogs blade depth adjuster is a notch on the
front face of the frog, just below the bottom of the lateral lever. This
notch locates with a gap in the plane blade and is controlled by an
adjusting wheel (usually brass) found at the rear of the frog. The depth
at which the blade is set is adjusted by turning the adjusting wheel,
this in turn regulates the thickness of the shavings. Turning the adjusting
wheel towards the frog raises the blade, and turning in the opposite
direction towards the rear handle moves the blade downwards.
The most common type of frog is that seen on planes like the
Stanley 4 Plane
which contain all of the above features.
Some more recent or lower cost planes sometimes don't include all of the above features
on their frog.
Some frogs have improvements such as the
'Bedrock Frog'.
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