{"id":711,"date":"2019-07-04T16:11:06","date_gmt":"2019-07-04T07:11:06","guid":{"rendered":"https:\/\/www.newregiston.co.jp\/?page_id=711"},"modified":"2020-03-16T19:00:10","modified_gmt":"2020-03-16T10:00:10","slug":"kiso05","status":"publish","type":"page","link":"https:\/\/www.newregiston.co.jp\/en\/baseint\/kiso05\/","title":{"rendered":"\u2164. What is peripheral velocity?"},"content":{"rendered":"<ul>\r\n\t<li><a href=\"#k15\">Maximum Operating Speed<\/a><\/li>\r\n\t<li><a href=\"#k16\">Peripheral velocity and RPM(Round Per Minute)<\/a><\/li>\r\n\t<li><a href=\"#k17\">Peripheral velocity of Grinding Wheels<\/a><\/li>\r\n\t<li><a href=\"#k18\">Burst peripheral velocity<\/a><\/li>\r\n<\/ul>\r\n<h2 id=\"k15\">Maximum Operating Speed<\/h2>\r\n<p>\u201cPeripheral velocity\u201d is the speed that a point in the circumference moves per second. \u201cMaximum operating speed\u201d is the highest peripheral velocity for ensuring safe operation; in no circumstances should the speed be exceeded. (Safety and hygiene regulations, article 119)<\/p>\r\n<p>Maximum Operating Speed is marked on each product.<br \/>\r\n*Manufacturer of grinding wheel should mark the maximum operating speed on the wheel which is over 3 inch. (Standards of grinding machines in Japan laws)<\/p>\r\n<h2 id=\"k16\">Peripheral velocity and RPM(Round Per Minute)<\/h2>\r\n<p>Peripheral velocity: The speed that a point in the circumference moves per second (Unit: m\/s, m\/min)<br \/>\r\nRPM: The number of times that a point in the circumference rotates per minute (Unit: min-1)<\/p>\r\n<p>Assuming there is a point in the circumference, when this point moves 72m (4,300m per minute) per second, the peripheral velocity of wheel is 72m\/s (4,300m\/min). The number of rotations when wheel moves 72m\/s is calculated according to the following equation.<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.newregiston.co.jp\/en\/wp-content\/uploads\/sites\/2\/2020\/03\/rpm.gif\" alt=\"\" width=\"467\" height=\"85\" class=\"alignnone size-full wp-image-2525\" \/><\/p>\r\n<h2 id=\"k17\">Peripheral velocity of Grinding Wheels<\/h2>\r\n<p>The table below shows peripheral velocity that is converted to kilometer per hour for easy reference.<br \/>\r\nThe careless operation is the common cause of serious accidents. Always pay attention to the safety.<\/p>\r\n<table>\r\n<tbody>\r\n<tr>\r\n<th>Grinding wheels<\/th>\r\n<th>Maximum operating speed<br \/>\r\n(m\/s)<\/th>\r\n<th>Kilometers per hour<br \/>\r\n(km\/h)<\/th>\r\n<\/tr>\r\n<tr>\r\n<td>Resinoid flat grinding wheels<\/td>\r\n<td>50<\/td>\r\n<td>180<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Cut off wheel<\/td>\r\n<td>72<\/td>\r\n<td>259<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Resinoid depressed center wheels<\/td>\r\n<td>72<\/td>\r\n<td>259<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Resinoid depressed center wheels for high speed<\/td>\r\n<td>80<\/td>\r\n<td>288<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2 id=\"k18\">Burst peripheral velocity<\/h2>\r\n<p>The biggest factor affecting safety is the internal stress caused by centrifugal force.<br \/>\r\nExcessive speed will produce internal stress exceeding its strength which can result in a wheel breakage. The excessive speed is called \u201cbursting peripheral velocity\u201d and safety degree is established based on the bursting peripheral velocity.<\/p>\r\n<p>The maximum operating speed is calculated by dividing the bursting peripheral velocity by a fixed safety factor. The safety factor for manual &#8220;center depressed wheel&#8221; and &#8220;cut off wheel&#8221; is &#8220;2.0&#8221;.<br \/>\r\nNRS has been conducting a random bursting test on our products (center depressed wheels and cut off wheels); make sure that the actual bursting peripheral velocity is more than double of the maximum operating speed for ensuring safety.<\/p>\r\n<p><strong>It&#8217;s the user&#8217;s responsibility to not exceed these maximum operating speeds.<\/strong><\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.newregiston.co.jp\/en\/wp-content\/uploads\/sites\/2\/2020\/03\/peripheral_velocity.gif\" alt=\"\" width=\"530\" height=\"288\" class=\"alignnone size-full wp-image-2526\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>Maximum Operating Speed Peripheral velocity and RPM(Round Per Minute) Peripheral velocity of Grinding Wheels Burst peripheral velocity Maximum Operating Speed \u201cPeripheral velocity\u201d is the speed that a point in the circumference moves per second. \u201cMaximum operating speed\u201d is the highest peripheral velocity for ensuring safe operation; in no circumstances should the speed be exceeded. (Safety and hygiene regulations, article 119) Maximum Operating Speed is marked on each product. *Manufacturer of grinding wheel should mark the maximum operating speed on the wheel which is over 3 inch. (Standards of grinding machines in Japan laws) Peripheral velocity and RPM(Round Per Minute) Peripheral velocity: The speed that a point in the circumference moves [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":47,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template_parent.php","meta":{"footnotes":""},"class_list":["post-711","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/pages\/711"}],"collection":[{"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/comments?post=711"}],"version-history":[{"count":4,"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/pages\/711\/revisions"}],"predecessor-version":[{"id":2527,"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/pages\/711\/revisions\/2527"}],"up":[{"embeddable":true,"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/pages\/47"}],"wp:attachment":[{"href":"https:\/\/www.newregiston.co.jp\/en\/wp-json\/wp\/v2\/media?parent=711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}