{"id":2492,"date":"2026-10-27T03:10:58","date_gmt":"2026-10-27T00:10:58","guid":{"rendered":"https:\/\/temak.com.tr\/en\/precision-parallel-sets-features-applications\/"},"modified":"2026-10-27T03:10:58","modified_gmt":"2026-10-27T00:10:58","slug":"precision-parallel-sets-features-applications","status":"publish","type":"post","link":"https:\/\/temak.com.tr\/en\/precision-parallel-sets-features-applications\/","title":{"rendered":"Precision Parallel Sets: Features, Applications and Accurate Set-Up"},"content":{"rendered":"<p>In machining operations (especially on CNC machining centres and universal milling machines), the calibrated accessories that ensure a workpiece is level, horizontally parallel and raised to the required machining height when clamped in a vice or on the machine table are called <strong>parallel sets<\/strong>.<\/p>\n<p>Watch Temak Teknik\u2019s video below explaining the types of parallels, their precision tolerances and the correct way to use them on the machine:<\/p>\n<p><iframe loading=\"lazy\" title=\"Paralel Altl\u0131k Setleri\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/ric2NJyFWKc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h2>Construction and Technical Specifications of Parallels<\/h2>\n<ol>\n<li><strong>High Precision and Surface Quality:<\/strong> The precision ground parallels are square to 90\u00b0, with a height and parallelism tolerance between pairs of <strong>0.01 mm (one hundredth of a millimetre)<\/strong> [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=49\" target=\"_blank\" rel=\"noopener\">00:49<\/a>].<\/li>\n<li><strong>High Hardness:<\/strong> They are made from heat-treated tool steel and have a hardness of approximately <strong>60 HRC<\/strong> [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=90\" target=\"_blank\" rel=\"noopener\">01:30<\/a>].<\/li>\n<li>\n<h2>Standard Sizes<\/h2>\n<ul>\n<li><strong>Lengths:<\/strong> Generally available in standard lengths of 100 mm, 125 mm and 150 mm [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=58\" target=\"_blank\" rel=\"noopener\">00:58<\/a>].<\/li>\n<li><strong>Width \/ Thickness:<\/strong> The most widely used in industry are <strong>5 mm (thin parallels)<\/strong> and <strong>10 mm (thick parallels)<\/strong> wide [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=80\" target=\"_blank\" rel=\"noopener\">01:20<\/a>].<\/li>\n<li><strong>Height Increments:<\/strong> Sets contain matched pairs in a range of heights such as 14, 16, 18, 20, 22, 24, 26, 28, 32, 35, 40, 45 and 50 mm [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=180\" target=\"_blank\" rel=\"noopener\">03:00<\/a>].<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2>Applications and Building Combinations<\/h2>\n<ul>\n<li><strong>Raising the Workpiece and Ensuring Parallelism:<\/strong> Placed between the vice jaws, they allow the workpiece to be clamped parallel to the base and at the required machining height [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=170\" target=\"_blank\" rel=\"noopener\">02:50<\/a>].<\/li>\n<li><strong>Combinations (Stacked \/ Side-by-Side Use):<\/strong> When an intermediate size other than the standard heights is required (e.g. 55 mm), the precise height can be achieved by stacking 5 mm or 10 mm thick parallels [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=194\" target=\"_blank\" rel=\"noopener\">03:14<\/a>].<\/li>\n<li><strong>Machine and Gauge Calibration:<\/strong> Used as support elements for precise levelling of machine tables, fixtures or gauges [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=35\" target=\"_blank\" rel=\"noopener\">00:35<\/a>].<\/li>\n<\/ul>\n<h2>Points to Consider When Using Parallels on the Machine<\/h2>\n<ul>\n<li><strong>The Worst-Case Scenario: Cutting or Drilling into the Parallels:<\/strong> In drilling or slotting operations on the workpiece, if the drill\/cutter length is not set correctly, both the parallels and the cutting tools will be damaged [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=140\" target=\"_blank\" rel=\"noopener\">02:20<\/a>]. The clearance under the workpiece (the distance between the parallels) must always be wider than the drill\/tool diameter [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=112\" target=\"_blank\" rel=\"noopener\">01:52<\/a>].<\/li>\n<li><strong>Chip Cleaning:<\/strong> At every part change, the surfaces of the parallels and the vice base should be cleaned with compressed air. Even a single small chip trapped under a parallel or on the contact surface with the part will compromise the part\u2019s 0.01 mm parallelism accuracy [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=232\" target=\"_blank\" rel=\"noopener\">03:52<\/a>].<\/li>\n<li><strong>Seating with a Plastic \/ Copper Mallet:<\/strong> After the workpiece has been clamped in the vice, it is tapped lightly from above with a plastic or copper mallet to ensure it is fully seated on the parallels [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=285\" target=\"_blank\" rel=\"noopener\">04:45<\/a>].<\/li>\n<li><strong>Checking for Movement (Play):<\/strong> Once clamping is complete, check by pulling gently on the parallels by hand. If one of the parallels moves, the part is seated at an angle\/skewed in the vice [<a href=\"https:\/\/www.youtube.com\/watch?v=ric2NJyFWKc&amp;t=314\" target=\"_blank\" rel=\"noopener\">05:14<\/a>].<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Precision ground parallel sets raise and level workpieces in the vice; learn about tolerances, standard sizes and correct use on the machine.<\/p>\n","protected":false},"author":4,"featured_media":2455,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-2492","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/posts\/2492","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/comments?post=2492"}],"version-history":[{"count":0,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/posts\/2492\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/media\/2455"}],"wp:attachment":[{"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/media?parent=2492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/categories?post=2492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/temak.com.tr\/en\/wp-json\/wp\/v2\/tags?post=2492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}