Saw glasses, types and how to use.

Cup saws are tools for drilling in various parts. Unlike drills, cup saws make holes for large diameters and different types of materials, due to this characteristic they are essential in various branches of activity such as carpentry, metalworking, electrical and civil construction.

For each type of material, a specific cup saw is necessary, so that the material is properly drilled ensuring the life of the cup saw the quality and integrity of the hole, so it is important to know the types of cup saws.

The drill

Before knowing the types of cup saws it is essential to know your drill. There are several types of drills on the market that will offer better or worse performance according to the material to be drilled. Professional drills have better performance, in general, because it is possible to regulate, for example, the cutting speed made by the jigsaw, hobbyist models are for less frequent uses, not recommended for constant and prolonged work when using jigsaws.

Personal protective equipment PPE

The professional who will use a glass saw must be using all the necessary PPE’s according to the activity, the use of goggles and in some cases a helmet with easy protector is the main one. Depending on the amount of noise emitted by the drill and the material being pierced, the use of ear protectors will also be necessary.

It is also recommended to use a shaving jacket to prevent sparks and projections of hot material from causing an accident in the work uniform.

Types of cup saws

As has been said there are some types of glass saws:

  • Bi-metal cup saw: They are suitable for cutting metallic and stainless steel materials, such as plates, profiles, and others.

Bi metal cup saw.

  • Multi-glass saw (videa): Suitable for cutting wood, MDF boards, plastics, with extreme ease, in addition to plaster and bricks

Saw glass of video.

  • Diamond cup saw: Used to cut reinforced plastics, germanium, asbestos (asbestos) and the like and other abrasive materials.

Diamond cup saw.

  • Cutter-type cup saw: ideal for cutting steel alloys, stainless steel and reinforced structures.

Cutter type saw.


In addition to the types of cup saws, it is possible to find some accessories that can be used in conjunction with the cup saws.

  • Fixing bracket: Some models of cup saw already come with the support close to the body, this is the case of the cup saw type milling cutter, in the other models it is necessary to use the fixing support for use and fixation in the drill.

Fixing brackets.

  • Pilot drills: These are the drills that guide the saw to the hole, and are fitted to the fixing bracke

Pilot drills.

  • Support extension: Used when very deep holes are required.

Extender for fixing brackets.

  • Waste collector: To prevent cutting residues from spreading and causing dirt.

Waste collector.

  • Waste ejector device: used to prevent residues from grabbing and accumulating inside the saw.

Waste ejector device.

Cutting fluid or coolant

For a deep hole or with very hard material, it is interesting to use cutting fluid or coolant, in this case it is considered an unfavorable situation very common in machining workshops. This fluid will facilitate the cutting process in addition to ensuring tool cooling.

Its main functions are:

  • Cool the cutting area.
  • Lubricate friction surfaces.
  • Drag the chip from the cutting area
  • Protect the tool and part against oxidation and corrosion.

Some exceptions to refrigeration are made, for example, when drilling in cast iron, in these cases it is important to analyze the manufacturer’s recommendation as to which materials should not be cooled during cutting and drilling.


Before using the chain saw it is important to follow some safety steps, ensuring safety in activities is essential.

Before the hole

  • Perform a visual inspection on the cup saw to check the presence of all the teeth for cutting, if the cup saw is not burned, possible damage to the saw body and if, in the case of the diamond cup saw, the presence of the diamond layer .

If any of these aspects are not in agreement, it is necessary to change the cup saw and, for safety reasons, you should not use a cup saw in material not suitable for it according to the manufacturer.

  • When attaching the pilot drill to the fixing bracket, the tip must not exceed the thickness of the material to be cut, otherwise, the saw’s bump on the material may break the teeth of the saw.

After use

  • Store the chainsaw clean, after use, clean and remove the residues, running water can be used for cleaning (in this case, dry the chainsaw before storing).

This conservation is important in order to guarantee a good tool life.

How to make the hol

  • Choosing the right cup saw for the material and with the right diameter, the company Starrett, for example, offers on the market cup saws with diameters from 14mm to 152mm
  • Mount the guide bit to the mounting bracket

Always check the cut of the guide drill so that there is no difficulty in starting the hole. Also use a punch to mark the appropriate location for the beginning of the hole, the use of the punch will ensure that the drill does not slip at the beginning of the hole.

Pointed puncture.

Punches for marking.

There are two types of grooves for the cup saw on the holder, a thread and a lock (the lock only for larger cup saws). The thread is manufactured in order to follow the direction of rotation of the drill, while turning the lock tightens the thread more, this ensures safety.

  • Properly fit the support already mounted on the saw to the drill chuck, correctly tighten the chuck to ensure safety during drilling.

ion from the margin for the accident at work.