VIDEO: Rules of thumb for calculating speeds when drilling

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The correct speeds result from the type of material you want to drill and the material of your drill. This then results in the cutting speed with which you can then calculate the speeds.

The calculation of the speeds based on rules of thumb

Most of the drills that you can buy nowadays are made of HSS steel (also called high speed steel). If you work with these drills, you can use the following rules of thumb to determine the speed.

  • If you (building-) If you want to drill steel, divide 7000 by the drill diameter, this will give you roughly the correct speeds.
  • For stainless steel, you should divide 3500 by the drill bit diameter for the required speeds.
  • You can see from the chip formation whether the speed has been selected correctly. The chip should look like a corkscrew. However, this only applies to steel. B. you'll get another chip.
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  • at wood or soft metals, such as aluminum, you can use a little more than twice the speeds that you calculated for steel.
  • With carbide drills you can use 5 times the speed.

In order to obtain a clean drilling pattern and to ensure that your drills are used carefully, you must cool sufficiently while drilling.

Further possibilities to determine the speed when drilling

In addition to the rule of thumb, you can also use other methods to determine the speeds.

  • You can see the speeds using Tables and Charts determine. For the diagrams you need the appropriate cutting speed for your material and Tools that you can find in cutting speed tables or on the packaging of your drill bits will. For HSS drills, a cutting speed of 25 m / min is recommended when drilling metal.
  • If you want to calculate the speeds exactly, you can use the physical formula for it. The formula is cutting speed x 1000 divided by drill diameter x 3.14. In variables n = Vc * 10000 / (n * π).

If you adhere to these rules of thumb and simple rules when drilling, you will get a good result and enjoy your drills for a long time.

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