What is Honing?

Honing machines are metal abrading tools and process utilizing hard tooling and perishable abrasives stones for the correction of

Diameter
Shape
Surface finish
Positional tolerances of bores

The hone process was developed to allow for perfection of bore geometry, size control, final surface finish and surface structuring. The honing process provides the final sizing and creates the desired finish pattern on the interior of tubing or cylinder bores. Finishing is accomplished by expanding abrasive stones of suitable grit and grade against the work surface. The stones are rotated and reciprocated in the part with hone abrasive under controlled pressure. Combining rotation and reciprocation produces a cross-hatch pattern in the surface of the part being honed.

Why Honing?

Cost effective machining method for:

Removing stock
Generating exacting
Bore tolerances
Bore polishing
Finishing bores of almost any material such a: sprayed coatings, CGI, Ceramics, etc.

Define The Honing (Process):

The honing process provides the final sizing and creates the desired finish pattern on the interior of tubing or cylinder bores. Finishing is accomplished by expanding abrasive stones of suitable grit and grade against the work surface. The stones are rotated and reciprocated in the part with hone abrasive under controlled pressure. Combining rotation and reciprocation produces a cross-hatch pattern in the surface of the part being honed.

Honing Machines Perform Three Operations

First, it is a stock removal process which takes out ruptured metal and reaches base metal.

Second, a finish pattern is generated to provide the best possible surface for promoting optimum lubricating conditions.

Third, honing assures extremely accurate straightness, roundness and size of the cylindrical surface.

What is Single Pass Honing Machine?

Single pass honing is done with a diamond abrasive, boring bar type honing tool. This type of honing tool produces a straight, round, and un-tapered bore in one pass of the tool through the part. Single pass honing is ideally suited for honing engine crank and cam bores. Since size is achieved in one pass, there is no crosshatch pattern in the finished part. The adjustable single pass tool expands the hone stones with a cone similar to standard tooling. However, the stones are not expanded and retracted as with conventional honing. The stones are only expanded to achieve size. The other difference is the hone tool is longer than standard tooling and the super abrasive coat the length of the tool. The single pass hone is tapered for about seven inches and has a final size section of 2.5 inches. See the photograph on the next page. The single pass tool has no in-process hone expansion, the machine must be stopped to adjust the tool.

When to Choose Single-Pass Tooling?

Single-Pass honing machines, also called Bore Finishing, is selected for a variety of applications that have special needs involving honed cavities:

Small diameter honing machine (normally within 2”)
High-production quantities
Reduced cost per part
Reduced down-time for tool change-over
Repeatable accuracy for dimensional tolerances such as bore size, roundness, surface finish
Only super-abrasive materials (Diamond and CBN) are used for the Single-Pass processing
A high rate/volume of coolant is needed to constantly remove the chips from the honing area
Oil or water-base coolants may be used for Single Pass honing, though oil is the most common

Single Pass honing process islimited to the types and volumes of material that can be removed. Specifically, the size and volume of chips removed must be no greater than there is clearance between the super-abrasive grits on the tool sleeve. As such, the Single Pass honing process is best suited for honing operations that produce a relatively small amount of chips, such as interrupted or short length bores. It is most successful (but not limited to) in honing cast iron and powdered metals.

Applications that feature a long length of material to be honed, small quantities and/or requiring a lot of material to be removed, are not the best suited parts for Single Pass honing. Rather, they may be best served using conventional Stroke Honing. In many cases, conventional Stroke Honing can also provide excellent dimensional geometry for these types of applications.

Why Stroke Honing Machines / Systems?

Barnes Stroke Honing Machines & Finishing Systems offers a complete line of products for all honing requirements. We can offer fully integrated systems and machines for high volume production applications and equipment for low volume job shop applications.We also offers rebuild and upgrade services for existing machines. We provide our customers with fully engineered complete custom solutions and offer a full line of accessories and consumables in addition to comprehensive training and repair services.

Our extensive line of Stroke honing machine / systems have the ability to hone machine bores with diameters ranging from 0.25 – 30 inches and bore lengths up to 75 feet. We offer systems for both medium to large-scale serial production as well as small batch production; these systems can be made to be manually operated or fully automated. With innovation and customer service as our main objectives, Barnes Stroke Honing & Finishing Systems is continuously researching and developing new technology and machinery. By consistently staying on top of the latest developments on the market, we ensure that our customers are provided with the most state-of-the-art production and control.

Why Single Pass Honing Machines / Systems?

Barnes Single Pass Honing/Finishing machine line is suitable for a variety of single pass honing applications. The flexible machine design can be configured with a single spindle for lower volume production requirements for the smallest of machine shops. It can also be arranged with multiple spindles to satisfy high volume production requirements for the most demanding of companies. Our Single Pass honing machines are designed and manufactured for minimal maintenance requirements and It's accessible configuration also reduces set-up and changeover time from part to part.