| When
the rod has been made up by the setter-outer a cutting list is
prepared for all the material required for the job.
The
list will go to the sawyer and machinist throughout the machining
processes.
It is used by the machinist to enable the timber to be selected
and cut to correct lengths with the minimum of wastage.
It
is very important that the lengths are all cut to the correct lengths
because the machinist sets the stops on the machine to locate the
joint positions and any variations would cause a sizing problem.
An
allowance for wastage will be built into the lengths to enable the
jointing and assembly to be carried out without the joints breaking
out.
A horn allowance is also included on frames and doors.
Extra waste should not be added because the timber is a
valuable resource and multiplied by a long run of frames soon add up
to a lot of money being wasted.
The
horns on Door and window frames is to provide ‘building in’ on
new-build properties and on doors to give protection in transit.
On replacement frames, the ‘horns’ or ‘joggles’ are
removed before fixing and the same for the door.
The
details found on the Cutting List include the following but they are
usually different from one workshop to another depending on the
practice of the company, etc.:
text
and graphics © G.Malthouse ~ all rights reserved |