Lee Valley Tools    Woodworking Newsletter
   Vol. 4, Issue 5
   May 2010
   Featured Patents

Cunneen Hacksaw

Cunneen Hacksaw

Unlike the straight stab or keyhole saw, a metal-cutting hacksaw will work effortlessly when it has two important properties: there must be a high degree of tension in the blade and the blade must always be inserted with the teeth oriented toward the front. This is due to the fine teeth and type of set for this kind of blade.

  Close-up of the teeth
  Close-up of the teeth.
  Blade tension mechanism
  Blade tension mechanism and patent stamp.
The cut is made on the push stroke. Ideally, the blade is lifted on the return stroke, the same way a file is used, to avoid premature dulling.

Tensioning of the blade is almost always accomplished by inserting it into a frame or holder. Early metal-cutting tools of this type often had a springy frame, so one inserted the blade much like stringing a bow for archery. In fact, the fret saws used by jewellers and the coping saws used for wood still utilize this method to achieve blade rigidity.

Tensioning of the blade allows for a clean cut and, in some cases, facilitates the use of thinner blades, creating less waste and finer control. The use of modern alloys in blade manufacture has now made this type of saw very practical for cutting metal by hand.
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