ID Grinding & Honing

Precision Grinding for Internal Diameters and Tight Tolerances

What Is ID Grinding and Honing?

ID (Internal Diameter) grinding is a precision machining process used to remove material from the inner diameter of cylindrical or conical parts. It employs a rotating abrasive wheel to achieve tight tolerances and smooth finishes on the internal surfaces of components. ID grinding is commonly used for applications where precise inner dimensions and surface finishes are required, such as in automotive bushings, gear bores, bearings, and hydraulic components. The process is capable of removing material in the range of thousandths of an inch, making it suitable for finishing operations where accuracy is crucial.

Honing is a finishing process that uses abrasive stones to remove very small amounts of material from the inner surface of a workpiece. The primary goal of honing is to improve the surface finish, roundness, and dimensional accuracy of the bore. Honing produces a distinctive cross-hatched microfinish that is extremely smooth and consistent, often used to enhance the fit and function of mating parts, such as the bore of a cylinder and its piston. Honing typically removes material in the range of ten-thousandths of an inch, making it a slower but more precise process than ID grinding.

ID Grinding and Honing: Achieve Superior Internal Precision

Heald 273A Universal I.D Grinder – Versatility makes it suitable for both single-part and job-lot production runs. Okamoto IGM-15NC – Incorporates advanced features such as CNC controls, which allow for automated operation and the programming of complex grinding paths. This enhances productivity and repeatability while reducing operator intervention. At CPG, our ID grinding services can:

handle diameters up to 8” with lengths up to 8”
achieve tolerances as tight as 0.0002”
get down to an 8 Ra finish

Our honing services improve surface finishes and cylindricity for parts with precise internal dimensions—using Sunnen EC-3500 honing centers and Sunnen 1800 & 1804 power strokers to deliver superior finishes on internal diameters, ensuring high-quality results for demanding applications. CPG’s honing capabilities:

range from as small as 0.125″ diameter up to 9″ diameter
hold tolerances of 0.0002″
get down to an 8 Ra finish

Is CPG’s ID Grinding and Honing Right for Your Application & Industry?

CPG’s ID grinding and honing services are ideal for industries like aerospace, automotive, and medical device manufacturing, where internal features like bores and housings must meet the highest precision standards.

If your components require tight internal tolerances, our ID grinding and honing solutions can meet your needs with proven reliability and performance.

Below are just some examples of the ID grinding and honing work we’ve done for OEMs and other manufacturers in metro Milwaukee and throughout the Midwest.

Part type: Spindle Shaft – OD Grinding & ID Grinding

Industries: Agriculture, Auto/Transportation, Oil & Gas Services, Recreational Vehicle/Power Sports

Applications: Shafts used in any industry with a moving part

Part type: Spindle Shaft – OD and ID Grinding

Industries: Agriculture, Auto/Transportation, Oil & Gas Services, Recreational Vehicle/Power Sports

Applications: Shafts used in any industry with a moving part

Part type: Boom Roller – OD Grinding and ID Grinding

Industries: Building/Construction Equipment

Applications: Boom trucks are versatile, truck-mounted cranes used for lifting and transporting materials, particularly in construction and utility applications.

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 Cylindrical 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.

Let’s Talk About Your Specific Requirements