Onsite Machining Tolerances

We carry out on site machining, in situ machining and portable machining including crankshaft grinding worldwide. Services Available World-wide.
On site machining and in-situ machining (including crankshaft grinding) carried out worldwide, 24 hours a day 365 days per year.
In-Situ Machining Tolerances for the Marine, Power Gen, Petrochemical, Process and General Industry.

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Tolerances & Specifications
Crankpins Tolerances on Crankpin journals will be held to the following subject to datum references. Roundness Taper and Concentricity +/- 0.0005" (0.013mm).
Main Journals Tolerances on Main Journals will be held to the following subject to datum references. Roundness and Taper +/- 0.0005" (0.013mm). Concentricity will generally be better than the above as it is determined by the axis of rotation of the crankshaft.
Crankshaft Thrust Faces
Ball Mill Thrust Faces
Thrust Faces will generally be machined to within +/- .00075" (0.02mm) flatness and swash.
Turbine and Generator Journals Tolerances on turbine journals will be held to the Original Equipment Manufacturers specifications
The most critical tolerance in such high speed shafts is the concentricity which is usually required within 0.013mm TIR.
Ball Mill & Fanshaft Journals Tolerances on Fanshaft and Ball Mill journals will be held to the following subject to datum references. Roundness Taper and Concentricity +/- 0.00075" (0.02mm).
Power Press Journals Tolerances on Power Press Crankshaft journals will be held to the following subject to datum references. Roundness Taper and Concentricity +/- 0.00075" (0.02mm).
Main Bearing Pockets Tolerance on roundness and taper will be generally held to within +/- 0.0005" (0.0127mm) for critical equipment such as marine diesel engines. Alignment of the pockets will be to within +/- 0.0005" (0.013mm) or to the OEM's specifications. Optical or Laser Alignment will be used when required to ensure perfect alignment.
Liner Lands Liner landings will normally be bored and faced to the OEM's specification. Usually within +/- 0,00075" (0.02mm) roundness and taper. Flat landing areas can be given a ground or machined surface flat within +/- 0.0005" (0.013mm) if required
Cylinder Heads Generally brought back to OEM specifications.
Cylinder Liner De-glazing Cylinder Liners can be honed and polished to within +/- 0.001" (0.025mm) roundness and taper subject to the condition of the original bore. Our equipment unlike many others will remove ovality as well as De-glaze the bores.
Selective Plating Selective plating can produce tolerances identical to the original, subject to using the correct final machining or grinding operations.
Keyway Machining Keyways can be machined in line with the shaft centreline and at very precise angles to one another using precision guide templates.
Slipring Machining Sliprings will be machined and polished Round, Concentric and Parallel to within +/- 0.00075" (0.02mm). Measurable surface finish characteristics are imparted using various techniques to provide the customer with their exact requirements.
Hydrogen Seal Face Hydrogen seal faces are usually machined and polished to give a flat swash free surface to within 0.00075" (.02mm) TIR with respect to datum references. The surface finish is better than 16micro inches CLA.
Internal Honing & Honing of Turbine Rotors Honing of Internal bores will generally produce a round and parallel bore within +/- 0.001" (0.025mm) subject to the type and hardness of the material. Bores which are very oval will require significant stock removal to improve them. The surface finish is generally better than 16micro inches CLA.
Linish Grinding of Cast Iron Cylinders Grinding of cylinders can usually be completed to within +/- 0.0004" (0.01mm) roundness and concentricity. The surface finish is generally better than 32micro inches CLA.
Grinding of Kiln Tyres & Rollers Grinding of Kiln Tyres can usually be completed to give a round smooth surface with no noticeable rocking of the kiln. The surface finish is generally better than 64 micro inches CLA.
   


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