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Working force Spring guide Base side Thicker wall cross-section The arrow is indicating of the force applying direction. For Piercing Cam slide structure is designed to bear greater loads The cam slide is designed to obtain high stiffness. The cam slide has been designed with a thicker wall which enables the unit to withstand greater load. OILES #2000 is supplied on all sliding sections. This Cam unit is best suited for processing of thick panel and high tensile strength steel Ordinarily, pre-positioning by driver alignment was unavoidable before positioning of driver and base for piercing. With this cam unit, this process is not required anymore, with a clearance between the cam slide and guide shaft. Location difference between the base and the driver is absorbed in this clearance, and assembly becomes easy. The cam slide is accurately positioned on the V-surface of the driver. Therefore, piercing position is always achieved. Pierce retainer positioning procedure The retainer can be positioned easily by taking the same procedure as OASA series. Refer to page 114 describing the OASA series for details. Easy piercing by self centering mechanism of the cam slide One-side clearance, 0.1mm or wider Bearing Cam slide Guide shaft Bearing magnified Base Shaft Cam slide Driver Clearance, 0.1mm or wider Clearance Bottom dead point OAHT56 and 75 series cam units are exclusively made for piercing applications. If these units are used for any operations other than piercing such as cutting or bending, a thrust block/receiver must be used. Lowering more than specified shut height may result in the damage of the built-in spring. Broken built-in spring may result in break-down of the cam unit. Precautions on design Cam Unit 283