26
12.0 Limitations of Use and Safe Working Practices
The following operations shall not be attempted on planer thicknessing machines, as they
cannot be performed safely:
stopped work, i.e. any cut which does not involve the full workpiece length,
planing of badly bowed timber where there is inadequate contact of the timber on the in-
feed table,
planing tapers which involves ‘dropping on’ where the bridge guard cannot be correctly
positioned,
thicknessing of more than one piece of timber at the same time. Accidents can be caused by
the thicknessing operation where the timber being thrown back by the knives. This can occur
when a heavy cut is being attempted on difficult material, but it happens more commonly
when a number of pieces are being thicknessed together. Because of inevitable variations in
the thickness of the pieces, the feed roller cannot grip each piece equally, and a thinner
piece travelling towards the cutter block between two thicker ones is liable to be ejected
violently when it comes into contact with the knives.
Only trained personnel should work on the machine. All local laws and regulations
regarding age and training should be met by any potential operator. This machine is not
designed for use by children.
It is essential that all operators of planer / thicknesser machines
are adequately trained in the use, adjustment and operation of the machine, this covers in
particular:
The dangers associated with the operation of the machine;
The principles of machine operation, correct use and adjustment of the fence, jigs and
safeguards;
The safe handling of the workpiece when cutting;
The position of the hands relative to the cutters and the safe stacking of the workpieces
before and after cutting.
Under no circumstances should anyone operate the machine while under the influence of
drugs, alcohol or any medication which may render them drowsy.
Persons who install this machine for use at work have a duty under safety laws and regulations
to ensure, as far as is reasonably practicable, that nothing about the way in which it is installed
makes it unsafe or a risk to health at any time during setting, use, cleaning, and maintenance.
This includes such aspects as correct assembly, electrical installation, construction of
enclosures, and the fitting of guards and ventilation equipment. When installing this machine
consideration must be given to the provision of adequate lighting and working space.
Repairs and maintenance must only be undertaken by competent technicians. Ensure that all
power supplies are isolated before maintenance work begins. Instructions for routine
maintenance work are included in this manual. All spare parts should be supplied by the
manufacturer.
Summary of Contents for PT255
Page 36: ...36 14 0 PT255 Planer Thicknesser Parts Diagram ...
Page 39: ...39 ...
Page 40: ...40 ...