Precision Finishing Step Bores
August 1, 2026
The Bore Honing division of Engis Corporation has developed advanced tooling and processes for precision finishing dual diameters (step bores) in parts. The advanced tooling and processes now enable step bores to be finished simultaneously and hold diametrical tolerances under 1 µm (0.000040") in production.
With the Engis design, separate size compensation for each diameter can be performed within seconds; the long-lasting diamond tooling helps to produce the lowest cost per finishing piece.
Single-pass dual diameter bore finishing advantages:
- Split sleeve design allows for independent size adjustment
- Size control within 1 micron
- Separate adjusting nuts
- Two sleeves on the same mandrel
- Improved concentricity of the bores
- Reduces the number of spindles.
Advancements:
- Adjustable sizing of each bore to within 1 micron
- Improved coaxiality of bores down to 1 micron
- Cylindricity of each bore under 2 microns
- High production rates (typically 150 to 300 parts per hour).
For more information contact:
Engis Corporation
105 West Hintz Road
Wheeling, IL 60090
800-993-6447 / 847-808-9400
info@engis.com
www.engis.com
IMTS North Building, Level 3
Booth 236726
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