From DT Online
Jointing Biscuits (aka Biscuit Joiner or Plate) are small curved shaped pieces of very dry material compressed to a standard thickness of 4mm such that they swell slightly when wetted with glue and tighten in the joint. They are made usually of timber (e.g. Beech), MDF or Ply. If made from Beech or similar natural wood, the Grain direction is diagonal to increase strength.
Features and Applications
Biscuits come in three standard sizes, No. 0, No. 10, and No. 20. Biscuit Jointers have pre-set depth stops that match these sizes and Slot Cutters, for use with a Router, have spacer bearings to slide over the cutter shank and limit the depth of cut.
- The crescent-shaped slots to receive the compressed wooden Biscuits are most easily cut using a purpose made Biscuit Jointer
- But the joining Biscuits can be used also in similar slots created by a Router fitted with a suitable Slot Cutter or into a continuous Groove along the edge of the timber.