ASME B107.50M pdf download BRICK CHISELS AND BRICK SETS: SAFETY REOUIREMENTS
4.3.2 The hardness of the struck face of the chiselor set shall not exceed 45 HRC
Many tests required herein are inherently hazardousand adequate safeguards for personnel and propertyshall be employed in conducting such tests.
4.4.1 General. Brick chisels and brick sers shallbe capable of meeting tests specified in paras. 4.4.2through 4.4.4. Separate (new) samples shall be usedfor cach of these tests. Failure to meet the requirementsof any one of the tests indicates that the chisels orsets are not in compliance with this Standard.
4.4.2 Hardness Determination Test. Hardnessdeterminations with respect to cutting edges and struckfaces shall be made on a fixtured tool or on a suitablemounted or unmounted specimen that has been cutfrom the tool using the wet-abrasive or other equivalentmethod. Any hardness test that uses equipment andmethods equivalent to Rockwell hardness determinationequipment as specified in ASTM E 18 shall be ac-ceptahle.
4.4.3 Impact Test for Brick Chisels, There shallbe no chipping, spalling, cracking. dulling, or tumningof the cutting edge; no mushrooming or chipping ofthe head (struck face): and no bending of the tool whentested according to the following procedure. Normaldeformation at cither end is pcrmnitted.
The brick chisel shall be mounted vertically withthe cutting cdgc resting crosswise on the largest surfaceofa rectangular common brick having a minimumthickness of 2.00 in.(50.8 mm) and a width of at least3.00in.(76.2 mm).
The brick shall rest on a solid foundation that supportsthe entire brick surface, such as a block weighing notless than 10 1 (4.5 kg).A stcel wcight of S I (2.3kg) and having astriking face hardness of 45 HRCto 60 HRC or equivalent shall be dropped 20 timesfrom a height of 10.0 in, (254 mm) squarely onto thcchisel struck face. The diameter of the striking faceof the weight shall not be less than 0.375 in.(9.53 mm) larger than the struck face of the chisel.Typically the weight is cylindrical and is droppedthrough a seamless tube slightly larger than the diameterof the weight. The test brick shall be moved after eachdrop of the weight to make a new impression.
4.4.4 Impact Test for Brick Sets. The impacttest for brick sets shall be the same as the test in para.4.4.3, except that the weigh shall be dropped 10 times.
5 SAFETY REQUIREMENTS ANDLIMITATIONS OF USE
(a) Brick chisels and brick sets are special-purposetools designed, manufactured, and intended only foruse in scoring and cutting brick and masonry block.(b) To avoid possible eye or other bodily injury,these tools shall not be used to cut metal objects orconcrete.
(c)A hammer blow should always be struck squarelywith the hammer face parallel with the struck face ofthe brick chisel or brick sct. Glancing blows, overstrikcs,and understrikes should be avoided.
(d) No surface of the chisel or set other than thestruck face shall be struck. The ball peen, hand drilling.or engineer’s hammer of the appropriate size shall havea striking face with a diameter approximately 0.375in. (9.53 mm) larger than the struck face of the brickchisel or brick set.
(e) Brick chisels and brick sets shall never be struckby a bricklayer’s hammer.
()) Brick chisels and brick sets shall not he usedfor prying or wedging.