The Bore Honing division of Engis Corporation has developed advanced tooling and processes for precision finishing dual diameters (step bores) in parts.  Our advanced tooling and processes now enable step bores to be finished simultaneously and hold diametrical tolerances under 1um (0.000040″) in production.
Engis precision diamond tooling is manufactured to the highest quality standards which produce unsurpassed bore cylindricity, surface finish and concentricity between each bore.
With the Engis design, separate size compensation for each diameter can easily be performed within seconds; the extremely 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)