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Cutter revolutions calculator

The carbide embedded cutters on a Redback Roller Reamer are made to withstand the high wear conditions of down holes operations. These cutters rotate at a relative speed to the speed of the drill string and often achieve many times more rotations than the drill string does. Therefore, it is important to know how long and how fast a drilling operation will go on for before the cutters get worn.

In this section, we have a simple calculator that calculates the total number of revolutions a cutter goes through based on the ratio of the circumference of the hole and cutter. To use this calculator, simply select a hole size in inches then fill in the string RPM and the number of rotating hours. Use the Reset button to reset the calculator if you would like a fresh start.

Also, some hole sizes could use different cutters to ream such as the 12-1/4″ hole size that can use either the 445 cutters or the 514 cutters to ream the same sized hole. The drop down in the menu for this case will be 12-1/4″ – 514 for a 514 cutter and similarly 12-1/4″ – 445 for a 445 Cutter. Note that dimensions are in inches. For any questions or issues, contact us using the button below.

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Calculate your total cutter revolutions

Pocket size:
Cutter diameter:
Cutter Circumference:
Hole Circumference:
Total Cutter Revolutions:

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