ASME B107.22M:1998 pdf download ELECTRONII: CUTTERS
4.6 Joint
4.6.1 Construction. There shall be no excessive sideways movement, play, or other indication of loose- ness of the two halves of the cutters when opened or closed that will affect the function of the cutters. The fastener shall have a hardness of 30 HRC to 50 HRC.
4.7 Jaws
4.7.1 Spring. All cutters shall have a spring. The spring shall be captive, durable, and capable of opening the jaws under normal use. The spring shall open the jaws to the minimum jaw opening distance, as indicated in the appropriate tables, for the normal life of the cutters. 4.7.2 Jaw Opening. Jaw opening distance shall be measured at the tips of the jaws. Beyond the minimum opening in the applicable tables, the jaws may open at increasing loads until the position stop i s engaged.
4.7.3 Jaw Hardness. Cutting edges [within 0.06 in. (1.5 mm) of the cutting edge shoulder] shall have a hardness equivalent to 55 HRC to 65 HRC and meet the cut tests specified in para. 5.3. The balance of the jaw shall have a minimum hardness of 35 HRC.
4.8 Finish li
4.8.1 Appearance. All cutters shall have finished heads. Finished surfaces shall have a maximum surface roughness of 63 pin. (1.6 p n ) arithmetic average. Measurement of the finish shall be made with a measur- ing instrument using a 0.03 in. (0.8 mm) roughness width cutoff (see ASME B46.1). All other surfaces not finished shall be free of pits, burrs, cracks, and other defects which may adversely affect the performance or appearance of the cutters. ELECTRONIC CUTTERS ~ 4.8.2 Coating. All surfaces must be coated _or ~ . treated to inhibit rust.
4.9 Marking
4.9.1 Requirements. Cutters shall be marked- in a plain and permanent manner with the manufacturer’s name or trademark of such known character that the- source of manufacture and country of origin may be readily determined. The markings-shall be as permanent as the normal life expectancy of the cutters to which it i s applied (providing the surface has not been sub- jected to a fretting or abrading action) and capable-of- withstanding cleaning normally experienced during its intended use.
4.10 Workmanship
4.10.1 Requirements. The requirements within this Standard are intended to describe the best commer- ~ cia1 quality cutters available. Cutters shall conform to the requirements specified in this Standard.
5 TESTING PROCEDURES
5.1 Safety Many tests required herein are inherently dangerous. Adequate safeguards for personnel and property shall be used when conducting such tests.
5.2 Handle Load Test
5.2.1 Procedure. Permanent set and deflection shall be tested in accordance with ASME B107.25M, para; 5. I . The load shall be applied at the point of maximum handle curvature. The cutters shall be tested with the comfort grips removed and a hardened jaw insert placed between the cutting edges.
5.2.1.1 Hardened Jaw Insert. Insert shall be approximately 0.06 in. ( I .6 mm) thick and tapered if required so that the cutting edges are completely in^ contact with the insert when the handle load i s applied. The insert shall be hardened to not less than 40 HRC.
5.2.2 Permanent Set and Deflection. Permanent set on all cutters shall not exceed 0.04 in. (1.0 mm) when subjected to a major load of 100 in.-lb ( I I N.rn).. Deflection on all cutters less than 5 in. (I27 mm) in nominal length shall not exceed 0.50 (12.7 mm). Deflection on all cutters 5 in. (I27 mm) in nominal length or longer shall not exceed 0.75 in. (19.1 mm). If permanent set or deflection exceeds the maximum values