FHN Series Floating Holders

July 12, 2023
Floating Holders Follow The Smallest Offset to Improve Single-Pass Honing Accuracy

The new Takezawa-Seiki FHN Series floating holders follow the smallest offset to improve single-pass honing accuracy. The New FHN Series are now available in North America through the online shop https://SocalSpecialtyTools.com.

Honing is a popular abrasive machining process that produces a precision surface on a metal workpiece by scrubbing an abrasive grinding stone or grinding wheel against it along a controlled path. Typical applications are the finishing of cylinders for internal combustion engines, air bearing spindles and gears. There are many types of hones, but all consist of abrasive stones that are held under pressure against the surface they are working on.

In honing, where very high precision is required, even small deviations between the center of the tool and the center of the pilot hole can have a significant impact on machining accuracy, quality, and tool life. Takezawa Seiki's FHN floating honing tool holder, designed specifically for one-pass honing, delivers key benefits including:

* Improves Single-Pass Honing Accuracy
* Follows even the Smallest Offset
* Extends Tool Life

The FHN Series method compensates for small offsets, including tilt, between the center axis of the tool and the pilot hole. By correcting the offset that occurs when attaching and detaching tools with the holder, it is now possible to achieve higher precision machining.

Depending on the degree of misalignment, the machining accuracy, such as surface roughness and roundness, may deteriorate. As the honing tool is pushed forcefully into the pilot hole's deviated position, it also experiences a load due to the reaction force from the pilot hole. This misalignment not only degrades the machining accuracy but also results in quality variations.

Takezawa Seiki's floating holder maintains a constant transmission torque, unlike conventional floating holders whose transmission torque is prone to fluctuations. Such fluctuations can result in variations in quality and load on the tool.

While other floating honing holders can compensate for offset-related problems, they themselves can cause other issues. However, Takezawa Seiki's floating holder has a unique mechanism that enables it to maintain a constant transmission torque.

Two models available for order online:
1. FHNS12C1: 12mm Shank with ER20 Collet
2. FHNS25C2: 25mm Shank with ER32 Collet

Related Glossary Terms

  • abrasive


    Substance used for grinding, honing, lapping, superfinishing and polishing. Examples include garnet, emery, corundum, silicon carbide, cubic boron nitride and diamond in various grit sizes.

  • abrasive machining

    abrasive machining

    Various grinding, honing, lapping and polishing operations that utilize abrasive particles to impart new shapes, improve finishes and part stock by removing metal or other material.

  • collet


    Flexible-sided device that secures a tool or workpiece. Similar in function to a chuck, but can accommodate only a narrow size range. Typically provides greater gripping force and precision than a chuck. See chuck.

  • grinding


    Machining operation in which material is removed from the workpiece by a powered abrasive wheel, stone, belt, paste, sheet, compound, slurry, etc. Takes various forms: surface grinding (creates flat and/or squared surfaces); cylindrical grinding (for external cylindrical and tapered shapes, fillets, undercuts, etc.); centerless grinding; chamfering; thread and form grinding; tool and cutter grinding; offhand grinding; lapping and polishing (grinding with extremely fine grits to create ultrasmooth surfaces); honing; and disc grinding.

  • grinding wheel

    grinding wheel

    Wheel formed from abrasive material mixed in a suitable matrix. Takes a variety of shapes but falls into two basic categories: one that cuts on its periphery, as in reciprocating grinding, and one that cuts on its side or face, as in tool and cutter grinding.

  • precision machining ( precision measurement)

    precision machining ( precision measurement)

    Machining and measuring to exacting standards. Four basic considerations are: dimensions, or geometrical characteristics such as lengths, angles and diameters of which the sizes are numerically specified; limits, or the maximum and minimum sizes permissible for a specified dimension; tolerances, or the total permissible variations in size; and allowances, or the prescribed differences in dimensions between mating parts.

  • shank


    Main body of a tool; the portion of a drill or similar end-held tool that fits into a collet, chuck or similar mounting device.


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