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How to replace the blade of a dry wall rasp?

How to replace the blade of a dry wall rasp

Shop for Dry Wall Rasps

Pocket and two-handled dry wall rasps with their replacement blades Many pocket and two-handled dry wall rasps have blades that can be replaced when the teeth become dull and worn.
It is quicker and cheaper to replace a worn blade on a dry wall rasp than it is to sharpen one with a file It is far quicker to replace a worn blade than sharpen the teeth with a file. Also, as blades are inexpensive, when you take into account the time required to sharpen a blade it often works out cheaper to replace it.
Loosen the tension on the dry wall rasps blade by turning the screw anti-clockwise

Step 1 – Loosen screw

Turn the screw anti-clockwise to remove the tension on the blade. Models that do not have a thumb screw will require the use of a screwdriver to do this.

Hooks on the blade hold it onto the rasp The blade of a pocket rasp is held in place by two hooks – one hooks around the front of the rasp’s body and the second locates into a hook attached to the screw in the rasp’s body.
Turning the screw on the rasp moves the hook within its body to increase or decrease the tension holding the blade in place. As the screw is turned anti-clockwise (as viewed looking at the head of the screw) the hook within the rasp’s body is pushed forwards. This removes the tension that holds the blade in place on the rasp, allowing it to be unhooked.
Pocket dry wall rasp with old worn blade being changed for a new replacement blade.

Step 2 – Remove and replace blade

Detach and remove the worn blade, first by unhooking it from the hook attached to the screw, then from the front of the rasp’s body.

Hook the blade onto the front of the rasp before you attach the hook connected to the screw. To fit the new blade, first hook it onto the front of the rasp’s body then attach it to the hook connected to the screw.
Wonkee Donkee says: "Put the new blade on the rasp with the teeth pointing in the same direction as they were on the old blade, otherwise the rasp will cut in the opposite stroke direction."
Tighten the screw on the dry wall rasp by turning it clockwise to exert tension on the blade keeping it in place

Step 3 – Tighten screw

Turn the screw in a clockwise direction (as viewed looking at the screw’s head) to apply tension to the blade in order to secure it to the dry wall rasp.

How does the screw apply tension to the blade?

Pocket rasp having old blade removed. Showing the small metal plate that is used to apply tension to the blade. When the screw is turned, a small metal plate within the dry wall rasp is moved along the screw’s thread. The small plate hooks under one end of the dry wall rasp’s blade, so when the screw is turned clockwise, the distance between the far end of the rasp where one end of the blade is attached and the plate where the other end of the blade is attached increases.
Blade attached to one end of a pocket rasp This increase in distance applies tension to the blade and holds it in place on the rasp. When the screw is turned anti-clockwise, the distance is decreased, which removes tension from the blade, allowing it to be removed from the rasp.

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