Crankshaft Grinding

Precision Surface Grinding for Cylindrical Parts with Tight Tolerances

What Is Crankshaft / Eccentric Shaft Grinding?

A crankshaft and an eccentric shaft are mechanical components that convert motion, but they differ in design, function, and application.

A crankshaft is designed to convert linear, reciprocating motion into rotational motion, while an eccentric shaft is typically used to create a precise, off-center rotation for variable control in machinery.

Crankshaft and Eccentric Shaft: What are the Differences?

Crankshaft

A crankshaft is the main rotating shaft in a reciprocating engine, like those in a car, or motorcycle.

Function: It converts the up-and-down (reciprocating) motion of the pistons, caused by combustion, into the rotational motion that turns the transmission and ultimately the wheels.
How it works: Connecting rods link the pistons to offset parts of the crankshaft, called “crankpins” or “rod journals”. As the pistons move up and down, they push and pull on the crankpins, causing the shaft to rotate. We also make crankpins.

Eccentric shaft

An eccentric shaft is a control shaft with an offset axis of rotation, which allows for precise and variable control of movement.

Function: It’s used in certain types of machinery to create a variable or oscillating motion. A key application is to precisely adjust the stroke or lift of a component.
How it works: The center of the shaft is offset from the center of the rotating disk or “eccentric.” A motor rotates or pivots this shaft, changing its position and adjusting the valve lift or other mechanism.

Is CPG’s Crankshaft Grinding Right for Your Application & Industry?

CPG serves OEMs and Tier 1 manufacturers across industries where crankshaft precision defines product performance:

Agricultural & Off-Highway Equipment: Heavy-duty crankshafts for diesel and hydraulic applications

Aerospace & Defense: Small engine and auxiliary power unit components requiring exceptional balance

Industrial & Energy Systems: Compressors, pumps, and rotating machinery driven by crank motion

Our team has extensive experience collaborating closely with engineering and maintenance departments to match part specifications, surface treatments, and performance goals.

Part type: Spacers, Rings – Surface Grinding

Industries: Agriculture, Building/Construction Equipment, Military/Defense Equipment, Industrial Machinery, Power Transmission

Applications: Precision spacers or rings are components used in mechanical assemblies to create a precise gap or maintain a specific distance between two parts.

Part type: Diesel fuel injection spacer – Surface grinding

Industries: Agriculture, Building/Construction Equipment, Military/Defense Equipment

Applications: Precision spacers or rings are components used in mechanical assemblies to create a precise gap or maintain a specific distance between two parts.

Part type: Diesel fuel injection spacer – Surface grinding

Industries: Agriculture, Building/Construction Equipment, Military/Defense Equipment

Applications: Precision spacers or rings are components used in mechanical assemblies to create a precise gap or maintain a specific distance between two parts.

What Our Customers Say

"Custom Production Grinding has been a valued partner in our supply chain for more than 15 years. They always deliver a quality product at a reasonable price in a timely manner. The staff is knowledgeable, dedicated and always willing to help us out of what is seemingly some hard-to-meet deadline requests. I would recommend Custom Production Grinding to anyone looking to have grinding done to a job. In my mind, they are second to none."

"Thank you and your team for the quick turnaround on the shaft project. I had a lot of pressure on getting these completed, with it being such a high-profile project for us, and of course by the time you got the parts there was no time to spare. Somehow I always worry, but somehow you guys always come through for me! In times like this it reminds me why I consider you a partner vs. just another one of my suppliers."

"I have been using CPG for more than 20 years for my grinding needs. I have always been very satisfied with their professionalism, quality and attention to detail. They truly have a sense of urgency when it comes to servicing each job. They will go above and beyond to get the job done when we need it, and they are one of the most competitively priced grinders in southeastern Wisconsin. I would recommend them for any grinding projects – whether it’s a small quantity, or large production run."

"I’ve been in supply chain management more than 30 years and am pleased to share that Custom Production Grinding is by far one of the most outstanding vendors I have worked with to date. Their staff is extremely easy to work with and does their utmost to achieve our sometimes unreasonable goals; it could be a move-up in a delivery promise, a same-day quote request, an explanation of said quote, or collaboration on a difficult solution or corrective action. I would gladly recommend their organization for your production grinding needs."

"CPG has been grinding our parts since the start of our company in 1997. They have earned our business and trust over the decades. The quality we received from them has been second to none and we know they will grind the job right. Their staff has a great understanding of our products and guide us in ways to produce our parts to help cut costs in the grinding process. We have been in rush situations with no time to go through the quoting process and just sent them the parts to be ground. Because of their integrity, we know we will be treated fairly. They are a great partner to us."

"We’ve worked with CPG for more than 15 years. They are a trusted partner in exceeding our customers' expectations!"

"We have been doing business with CPG for over 38 years. They have been a strategic part of our supply chain since they opened. They are easy to work with and extremely accommodating to our due dates, with quick turnaround times. They produce quality parts and have great attention to detail."

Ready to Improve the Precision of Your Parts?

Get a free quote and discover how CPG’s grinding solutions can help optimize your manufacturing process and improve the quality of your metal or plastic parts.

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