Woods, Plastic, Thin metal sheeting
Carbon steel hole saws are used for making large holes in wood, plastic, plasterboard and soft sheet metal with a maximum cutting depth of approximately 25 mm. Ideal for large holes
For example: locksets in doors, or plumbing pipes. Hole saws have a central pilot drill that bites into the material first. This keeps the cylindrical saw blade in line so that it then cuts a perfect circular hole.
The central drill bit is part of the detachable accessory known as the arbor. The arbor + drill bit is simply screwed to the blade before cutting commences.
When a clean splinter-free hole is needed, drill from both sides. This requires a pilot hole be drilled through the object initially. This will transfer the centre mark to the opposite side for perfect alignment.
• Medium speeds are required for wood and low speeds for metal.
• If possible, use a low geared + high torque drilling machine with safety clutch.
• Always make sure the drill bit is tightened properly in the arbor.
• Excessive heat can damage the blade and a stop-start drilling action is important.
• A pumping action will help to extract sawdust and also limit overheating.
• Deeper holes can be drilled if the excess wood is chiseled out as you proceed. Partial or blind holes cannot be made with Hole Saws - use a Forstner bit instead.
|4BF20U||D/SET HOLE SAW||64-86mm||Q:5|