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Next Generation Honing of Engine Blocks, Liners and Parts

The SV-30 cylinder hone from Sunnen features automatic step-and-repeat capability for in-line and V-block engine configurations that produces ideal bore roundness and surface finish in a variety of part types and materials at an affordable price.

Posted: March 19, 2019

To reduce setup time and improve bore quality when honing engine cylinder blocks, cylinder liners and other engine parts, the SV-30 cylinder hone from Sunnen provides step-and-repeat capability for automatic bore-to-bore processing of in-line and V-block configurations, with spindle reversal for creating a slightly rounder bore, removing folded-over metal and cleaning debris out of the valleys of the surface finish to achieve the desired result.

The SV-30 cylinder hone from Sunnen Products Company (St. Louis, MO) is the next generation of legendary Cylinder King® machines, achieving expert results on engine cylinder blocks, cylinder liners and other engine parts that require honing. Six standard models include four step-and-repeat capability versions that allow automatic bore-to-bore processing for in-line and V-block configurations, reducing setup time and improving bore quality. In addition, two models are available with a manual X-axis. The SV-30’s cylinder diameter range is 0.75 in to 8.0 in (19 mm to 200 mm) depending on the tooling option, and the new GH-LF tooling is required for automatic step-and- repeat operation. With six new models in the series, the SV-30 can be tailored to meet the needs of manufacturers, job shops and automotive performance and rebuild shops. It includes a new PC control with simplified menus and storage for 1,000+ setups for quick and easy changeovers. When used with the wide range of Sunnen-made abrasives, tooling and coolants, the U.S.-built SV-30 produces ideal bore roundness and surface finish in a variety of part types and materials at an affordable price.

The SV-30 includes spindle reversal, standard bore oversize setup (.010 in/ .020 in/ .030 in) and automatic tool protection at the top and bottom of the bore to verify an unobstructed stroke before starting a cycle. Models include either a variable-speed 6 hp (4.5 kW) servo or 5.5 hp (4.1 kW) induction spindle motor, producing speeds from 50 rpm to 600 rpm. A 3.4 hp (2.5 kW) servo ball screw system produces up to 100 true vertical spm with a stroke travel up to 27.75 in (705 mm). The linear stroking drive maintains concentricity with the bore throughout the full stroke to produce a consistent diameter from top to bottom. A large 48 in x 30 in (1,219 mm x 760 mm) work envelope allows versatility in processing bigger parts. The new spindle reversal feature duplicates the capabilities of machines used by automotive OEMs: “Reversal can be used anytime in the process, but is especially helpful during the finishing strokes,” explained Phil Hanna, a product manager at Sunnen. “Reversal helps create a slightly rounder bore and aids in achieving the desired surface finish. It causes the honing stones to take out any less-than-round shape left after initial passes, while shaping up and dressing the stones themselves. Reversing the spindle also aids in removing folded-over metal and cleaning debris out of the valleys of the surface finish.”

The proven Phoenix industrial PC control ensures automatic, consistent bore-to-bore geometry and finish, without constant adjustment by the operator. The 15 in (381 mm) color touch screen with intuitive controls provides a real-time display of the full-bore cross section during the process. The control can store 1,000+ part setup programs, and a USB port allows offline setup file storage. The control’s programmable Auto-Dwell feature automatically corrects taper anywhere in the bore for unattended operation, while two-stage honing tools with diamond or CBN abrasives can complete roughing and finishing operations in one pass for high productivity. Left/right positioning of the honing column on its 32 in (813 mm) X-axis is easily accomplished with a servo-motor or a manual hand wheel located immediately below the operator station (model dependent). The machine is equipped with a 55 gal (208 l) internal coolant system with two standard steel canister cartridge filters, heavy-duty pump, and filter status gauge.

In addition to the GH-LF tooling required for automatic step and repeat operation, the SV-30 is compatible with all of Sunnen’s current large diameter tooling, including diamond abrasive hone heads and brushes, GHSS single-stage hone heads with CBN or diamond abrasives and brushes, and GHTS hone heads for two-stage honing with CBN or diamond abrasives. The SV-30 is equipped with new standard LED lighting in the work envelope and has the latest standard safety features, including light curtain, interlocked front door, stainless guarding around the work envelope, and safety PLC which limits setup speeds in all axes. Options include a T-slot base (for custom fixturing), heavy-duty manual rollover cradle for engine blocks, and a full-feature automation interface. The SV-30 is backed by a three-year parts and labor warranty and is sold and serviced as part of a total system that includes abrasives, tooling, bore gauges, and coolants.

Sunnen Products Company, 7910 Manchester Road, St. Louis, MO 63143, 314-781-2100, Fax: 314-951-2718,,

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