Milwaukee Rasping Jab Saw Preview

Milwaukee Rasping Jab Saw Preview

The Milwaukee Rasping Jabsaw (or Rasp) is a type of saw blade used primarily for cutting thin sheetrock or plywood. It is often referred to as a “saw knife” because it resembles one when opened up. These blades are generally made from hardened steel with a flat face and have serrations along their length which allow them to cut through wood without damaging it. They are typically manufactured by Stanley or other manufacturers.


These blades are designed to be operated using either a hand crank or a lever action mechanism. When open they resemble a small saw, but when closed they resemble a knife. They come in several sizes and configurations depending upon the application required for their use. Some examples include:

Smaller than regular jigsaws, these blades can easily fit into most standard wall framing frames and cabinets where space is at a premium.

They are ideal for cutting through sheetrock or plywood. They work well on both hard and soft surfaces such as concrete, brick, tile, etc.

For general purpose use they do not require special tools and can be used to cut large pieces of material. However they are usually too heavy to maneuver around tight spaces.

Medium sized blades suitable for cutting through thicker materials like plasterboard or MDF.

Larger blades designed to cut through thick materials like hard wood or metal.

How to Use a Rasping Jabsaw:

To use a rasping jabsaw, the material you need to cut should be clamped down securely, one end of the blade should be placed on the surface of the material and then the blade is pushed along the material to be cut while applying even and steady downward pressure.

A cutting lubricant should be used for softer materials such as wood. For harder materials, a rasping blade can be used without any type of lubricant.

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Risks and Safety:

The main risk using these blades is the downward cutting motion could result in the blade sinking too deep into the material and possibly hitting your wrist. In this instance you should try to avoid over-penetrating the material.

If your blade happens to get stuck inside the material, it is best to flick your wrist quickly and pull the saw out of the material. If you try to pull it out by pulling directly on the handle, the handle could break.

After you are finished cutting, it is best to release any tension on the blade and place it somewhere safe.

If another cut needs to be made, be sure to take a moment to readjust your position and start again.

Most rasps are sharp enough to cut your fingers if you are not careful. Always wear protective gloves when working with these blades.

Another risk is using too much force and breaking the blade. If this happens you could be injured by one of the cutting edges of the blade.

The sides, top and bottom edges of the blade all have sharp edges that could easily slice skin if handled improperly. Keep hands and fingers away from the cutting edges at all times.

If you have any cuts or open wounds on your hands or fingers, you should not be using this type of blade until the wound is healed.

Once the blade is broken, it needs to be discarded.

Be aware of what is going on around you and use common sense.

If you feel yourself getting dizzy or lightheaded, take a break.

Practice properly fitting your safety gear before working with any powered tools.

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Gouging Blades:

Gouging blades are a specialized type of blade that is designed to cut at an angle on soft surfaces such as wood, plastic, drywall, etc. These blades can be used by hand or in a power saw. They are usually made out of either steel or carbide.

The cutting edge of the blade has multiple small teeth with a V-shape at the base that are designed to cut through soft material at an angle.

The teeth on this type of blade are very small and prone to breaking and becoming dull if used on any other material than what they were designed for.

For this reason, they should only be used for their intended purpose. Using them for any other purpose could be dangerous and may cause damage to the blade.

How to Use a Gouging Blade:

To use a gouging blade, clamp your work piece down securely.

Start the blade in the material at a shallow angle and slowly push the blade through the material.

Make sure that you do not apply too much downward pressure on the blade. Let the weight of the saw do most of the work. Excessive downward pressure could cause the blade to break.

If you are using a power saw, be sure that you are using the correct blades for your saw and that they are installed and tightened properly. Most power saws have a manual which will give you all the specifications for the proper blades to use.

Risks and Safety:

There are few risks and dangers involved with using gouging blades. Always wear safety glasses when working with these blades. The teeth on these blades are very small and can easily break off and become airborne while in use. If one of these tiny teeth happens to get into your eye, it could cause severe damage or even loss of vision.

Never attempt to use these blades on anything other than their intended purpose. Using a gouging blade on metal or any other hard materials could cause the blade to break or the teeth to shatter and become loose and airborne.

If this happens, the tiny teeth could get caught in the saws’ mechanism or fly off in another direction causing harm to you or someone else.

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Always use common sense when using any power tools. If a tool feels unsafe or causes you to feel uneasy, then don’t use it.

Carbide Tipped Blades:

Carbide tipped blades are a metal cutting blade with carbide tips on them. They are designed to be used in a circular saw.

These blades are much harder than regular steel and stay sharp longer when cutting most metals.

The high cost of carbide tips keeps these blades from being used on a regular basis, but they are great for cutting metal when you need to.

Safety Tips:

Always clamp your work piece down securely before cutting. This will help prevent your work piece from moving and causing an accident.

Wear safety glasses and other protective gear. Metals and tools can be dangerous. (Eye protection, gloves, etc.)

Make sure your saw is working properly before using it. Not doing so could cause an accident.

Always keep the area around you free of clutter and clear of other people. You don’t want anyone to step in the way of a flying piece of metal or get hurt by a falling piece of wood.

Milwaukee Rasping Jab Saw Preview - Picture

If you need to cut metal, use a carbide tipped blade. This will ensure that you make a clean and accurate cut in the metal.


Carbide tipped blades are very expensive. To save money, consider buying an old circular saw from a second hand store or a friend and replacing the blade on it with a new one.

Always wear protective gear when operating a power tool.

ALWAYS unplug your saw before changing any blades.

Carbide tipped blades cannot be used to cut wood. Attempting to do so could cause the blade to shatter and fly off the saw, causing harm to yourself or someone nearby.

Always wear safety glasses when operating a power tool.

Sources & references used in this article: