The Essential Guide to Crankshaft Grinding Machine Shops
A crankshaft grinding machine shop specializes in the precision machining and refurbishment of crankshafts, a critical component in internal combustion engines. Whether for automotive, marine, or industrial applications, these shops play a vital role in engine rebuilding and performance enhancement. Below is an overview of crankshaft grinding processes, equipment, and key considerations when choosing a machine shop. .jpg)
What is Crankshaft Grinding?
Crankshaft grinding is a machining process that restores worn or damaged crankshafts to their original specifications (or better) by removing material from the journal surfaces (main and rod bearings). This ensures proper fitment, smooth operation, and extended engine life. .jpg)
Key Steps in Crankshaft Grinding
1. Inspection & Measurement
– The crankshaft is thoroughly inspected for cracks (using magnetic particle or dye penetrant testing).
– Journals are measured for out-of-roundness, taper, and wear using micrometers and dial indicators.
2. Straightening (if needed)
– Bent crankshafts may require hydraulic straightening before grinding.
3. Grinding Process
– The journals are ground to undersize specifications (e.g., 0.010″, 0.020″, or 0.030″) using specialized grinding machines.
– Proper radius finishing is applied to prevent stress fractures.
4. Polishing & Finishing
– After grinding, journals are polished to achieve a mirror-like surface finish for optimal oil retention and bearing contact.
5. Final Inspection & Balancing
– The crankshaft is rechecked for dimensional accuracy and balanced (if required) to minimize vibrations at high RPMs.
Equipment Used in Crankshaft Grinding Shops
– Crankshaft Grinders: High-precision machines (e.g., Berco, Storm Vulcan, AZ Spa) with CNC capabilities for consistent results.
– Polishing Machines: To refine journal surfaces after grinding.
– Dynamic Balancers: For performance engines requiring perfect balance.
– Welding & Hardfacing Tools: Used when rebuilding severely worn cranks with material buildup before grinding.
Choosing the Right Machine Shop
When selecting a crankshaft grinding shop, consider:
✔ Experience with your engine type (automotive, diesel, racing).