A Bedrock frog is the central part
of certain woodworking planes on which the plane blade lays and is
The Bedrock frog is a special version of the common standard frog design which are found on most iron bench planes.
The Bedrock frog is found on Stanley Bedrock planes e.g. Stanley 607C as well as being found on more modern high-end planes such as the Clifton bench planes and the Lie Nielsen bench planes.
The Bedrock frog allows the quick adjustment of the throat by moving
the frog forwards and backwards without the need to remove the blade
and cap to unscrew the frog.
The Bedrock frog is released by unscrewing the frog at the rear instead of the usual way of unscrewing the frog underneath the blade.
The Bedrock frog has two runner slots parallel to each other located
in the depressions of the frog face / bed.
Note: On the common standard frog, these depressions are where the frog securing screws / screw holes usually are.
The Bedrock frog has two special bolts which slot into these runner slots.
The special bolts have screw holes in the bottom part of the bolts stem. These screw holes are the crucial part to how the Bedrock frog works.
As with conventional frogs, the Bedrock frog needs a way of ensuring the frog is locked in position and stable.
This is done with the use of two frog securing screws; the same as conventional frogs. The difference is the position where these frog securing screws are used.
The frog securing screws on the Bedrock plane go through the rear of the frog at the base where the frog beds with the frog seat (a solid part of the plane body).
These frog securing screws not only screw into the plane seat but also locate with the screw holes in the special bolts. This combination firmly secures the frog while allowing the frog to be moved quickly and easily.
To move the frog, loosen the two frog securing screws (located at the rear of the frog on either side of the central frog adjusting screw) and then turn the frog adjusting screw (located at the rear of the frog below the brass winder wheel) to move the frog backwards and forwards.
Once in position tighten the frog securing screws to lock the frog in position. Note: ensure the screws are tightened enough that the frog doesn't rock/move but not too tight that the mechanism / screw threads are damaged.
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