What is hole saw arbor?

 Shivani Sharma 
Účastník (Participant)

Cutting a hole with a hole saw requires the use of an arbor and often a pilot bit. Arbors, also called mandrels, are designed to connect a hole saw to a drill chuck as well as hold the pilot bit. They are made from hardened steel and alloy steel components for long life, as they need to last through multiple hole saws. Arbors connect to the hole saw with a thread in the cap of the hole saw. Hol”-18 thread drives hole saws 1-1/4″ and larger. The larger hole saws (1-1/4″ and larger) also have drive pin holes in the cap which receive drive pins from the arbor to facilitate quick and easy changes of the hole saw. Smaller hole saws connect to the arbor only with the thread and often get locked onto the arbor requiring tools to remove the hole saw.

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  • Ydenal Brayde
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    The best bi-metal hole saws will be made with high speed steel that has a high percentage of cobalt content. Manufacturers such as Milwaukee® use only Matrix II high speed tool steel in the manufacture of their bi-metal hole saws. Matrix II contains approximately 8% cobalt to help maintain tooth hardness at high operating temperatures, which helps to maintain the teeth’s sharpness of the cutting edge.

    More important to users is the life they will get from their bi-metal hole saw, or how many holes they will be able to cut before needing to replace it. In addition to using high speed steel with cobalt, the heat treatment process used by the manufacturer will impact the life expectancy of the hole saw. Milwaukee® uses a proprietary cryogenic hardening process that improves upon the traditional heat treatment cycle by using sub-zero temperatures as part of this process. This process improves the microstructure transformation of the high speed steel and results in a product that stays sharper longer. All of Milwaukee’s bi-metal hole saws are treated with this Ice Hardened™ cryogenic hardening process which deliver up to 50% longer life than other hole saws in the marketplace.


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