Cleaving logs to make boards for the West Stow Saxon House Project.
WESTOVER WOODLANDS - CLEAVING LARGE AND SMALL TIMBERS.
|Cleaving is the
process of splitting wood along its grain. The process retains the strength
and durability of the wood more effectively than sawing.
Before cleaving a piece of timber we remove the bark using a drawknife or a debarking spade so that we are able to see where the split is running.
Timbers less than approximately 15cm in diameter and up to 3m long are placed in a cleaving brake, (a wooden structure to hold the material while its being cleft which helps to control the split), and split with a froe.
Large diameter timber (more than 15cm) is split with wedges for the first, and sometimes subsequent splits, to make the timber more manageable.
Wood is ideally
split two to three months after felling, though larger timber can be left
for several years. If left too long the timber will have dried out and
won't respond as well to cleaving; if the timber is too green, e.g. within
the first week of it having been felled, then it may split too easily
and it will be hard to control the split.
For example, when splitting a piece of timber in half the split should run centrally. However, if it begins to run into either half we can position the timber in the brake with the larger half on the bottom, and by pushing down on that half while using the froe to continue to cleave it, the split should right itself. Of course it doesn't always work! It is easier to cleave timber in half because when going into three it is harder to control the tension, as one side is bigger.
Not all species of timber cleave well, and even those that do often have awkward knots and twisted grain that will make it difficult to control the direction of the split.
Chestnut (Castanea sativa) to produce:-
Post and rail fencing
Batten for lathe and plaster
(Corylus avellana) for:-
Batten for wattle and daub work
Infill for garden structures
(Fraxinus excelsior) for:-
Table and chair legs, and backs
Our tool handles
Oak (Quercus robur
/ petraea) for:-
Finishing on the shave horse.