{"id":5527,"date":"2018-12-21T01:00:37","date_gmt":"2018-12-21T06:00:37","guid":{"rendered":"http:\/\/www.rpwoodwork.com\/blog\/?p=5527"},"modified":"2018-12-21T01:01:32","modified_gmt":"2018-12-21T06:01:32","slug":"pinch-rods","status":"publish","type":"post","link":"https:\/\/www.rpwoodwork.com\/blog\/2018\/12\/21\/pinch-rods\/","title":{"rendered":"Pinch rods"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"570\" height=\"395\" src=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4996_edited-2.jpg\" alt=\"pinch rods\" class=\"wp-image-5528\" srcset=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4996_edited-2.jpg 570w, https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4996_edited-2-150x104.jpg 150w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/figure>\n\n\n\n<p>Accurate construction of most furniture assemblies \u2013 frames, carcasses, post-and-rail construction, and drawers \u2013 usually involves 90\u00b0 angles. &#8220;Square&#8221; is a big part of woodworking. Parallelograms, we do not want.&nbsp;<\/p>\n\n\n\n<p>Will a square do the job? Yes, for verifying individual parts, but for most assemblies, the tool to use is pinch rods. <strong>Here are the reasons:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>They are more <strong>accurate<\/strong>.<\/li><li>You can work <strong>faster<\/strong>, and don&#8217;t need to remember numbers.<\/li><li>You will get a more <strong>intuitive<\/strong> sense of the magnitude and direction of the error.<\/li><li>Most important, you will see immediately <strong>how to correct it<\/strong>, especially during glue up.&nbsp;<\/li><\/ul>\n\n\n\n<p><strong>The idea is simple.<\/strong> You are comparing the length of the diagonals across the frame. If they are equal, you have a rectangle; if not, you have something else, such as a parallelogram. (Yes, the diagonals would still be equal in a symmetrical trapezoid, but you will not make that if you start with the opposite sides of the frame being equal, unless of course you want it ever so slightly that way in making a carcase to hold drawers.)&nbsp;<\/p>\n\n\n\n<p>I have been using this set of pinch rods for more than 20 years, which I made with <a href=\"http:\/\/www.leevalley.com\/us\/wood\/page.aspx?p=32585&amp;cat=1,43513,43553\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"collars manufactured by Veritas (opens in a new tab)\">collars manufactured by Veritas<\/a>. I recommend these because they simplify construction, and the result is a lightweight, low profile tool that is quick and secure to clamp, and adjusts smoothly.&nbsp;<\/p>\n\n\n\n<p>Veritas supplies basic construction instructions but <strong>here are a few tips<\/strong>. You&#8217;ll want to build a set of rods, so keep in mind that the shortest length a pair of rods can measure is at least 1&#8243; longer than the individual stick length, while the longest measurement will be about twice the stick length minus 3&#8243;.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"570\" height=\"380\" src=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4997_edited-2.jpg\" alt=\"range of pinch rods\" class=\"wp-image-5529\" srcset=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4997_edited-2.jpg 570w, https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4997_edited-2-150x100.jpg 150w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/figure>\n\n\n\n<p>A 40\u00b0 <strong>chisel-like business end<\/strong> works well, but contrary to Veritas&#8217; instructions, I suggest orient the pair of sticks so the bevels face away from each other, toward the outside, as seen in the photo below. In use, the beveled side should always face the shorter side of the rectangular assembly. Thus, you will rotate the stick 180\u00b0 along its length to measure the other diagonal. This allows the tool to manage even the narrowest rectangles.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"570\" height=\"271\" src=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4998_edited-2.jpg\" alt=\"pinch rod ends\" class=\"wp-image-5530\" srcset=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4998_edited-2.jpg 570w, https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_4998_edited-2-150x71.jpg 150w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/figure>\n\n\n\n<p>The storage position is shown in the photo below. The non-working blunt end protects the sharp-beveled working end.&nbsp;I prefer to apply the gentle accuracy of these wooden rods instead of metal ones on cleaned up work.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"570\" height=\"444\" src=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5000_edited-2.jpg\" alt=\"pinch rod ends\" class=\"wp-image-5531\" srcset=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5000_edited-2.jpg 570w, https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5000_edited-2-150x117.jpg 150w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Nearly always, you will be measuring from the <strong>inside<\/strong> of the frame or carcass because the other parts of the assembly will interact with the inside surfaces and angles, not the outsides.&nbsp;<\/p>\n\n\n\n<p>For very large assemblies, a tape measure, perhaps with the <a href=\"http:\/\/www.leevalley.com\/us\/wood\/page.aspx?p=56766&amp;cat=1,42936\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"special tip (opens in a new tab)\">special tip<\/a> made by Veritas, or an ad hoc pair of rods, is more practical than having a giant special pair of rods.&nbsp;<\/p>\n\n\n\n<p>To make a parallelogram into a rectangle, there is a simple <strong>rule to remember:<\/strong> shorten the long diagonal. For dry assembly, this may mean tweaking the joints, such as trimming tenon shoulders in a frame or post-and-rail construction, or simply adjusting the positions of the clamps. <strong>During the crunch time of glue up, remember:<\/strong> angle the clamps to be slightly more along the long diagonal, as if you are trying to scrunch it shorter. I am always amazed at how little clamp adjustment is necessary to square up the assembly, especially using heavy clamp pressure. Don&#8217;t overdo it.&nbsp;<\/p>\n\n\n\n<p>Sure, you did a meticulous layout and cut great joints \u2013 dovetailed that drawer, mortise-and-tenoned that frame \u2013 but somehow when it all goes together the evil forces still manage to sneak in. Assess and correct it with pinch rods.&nbsp;<\/p>\n\n\n\n<p>You might even want to make a nifty <strong>rack<\/strong> to store them.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"570\" height=\"504\" src=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5001_edited-2.jpg\" alt=\"rack for pinch rods\" class=\"wp-image-5532\" srcset=\"https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5001_edited-2.jpg 570w, https:\/\/www.rpwoodwork.com\/blog\/wp-content\/uploads\/2018\/12\/IMG_5001_edited-2-150x133.jpg 150w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Accurate construction of most furniture assemblies \u2013 frames, carcasses, post-and-rail construction, and drawers \u2013 usually involves 90\u00b0 angles. &#8220;Square&#8221; is a big part of woodworking. Parallelograms, we do not want.&nbsp; Will a square do the job? Yes, for verifying individual parts, but for most assemblies, the tool to use is pinch rods. Here are the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-5527","post","type-post","status-publish","format-standard","hentry","category-tools-and-shop"],"_links":{"self":[{"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/posts\/5527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/comments?post=5527"}],"version-history":[{"count":9,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/posts\/5527\/revisions"}],"predecessor-version":[{"id":5541,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/posts\/5527\/revisions\/5541"}],"wp:attachment":[{"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/media?parent=5527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/categories?post=5527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rpwoodwork.com\/blog\/wp-json\/wp\/v2\/tags?post=5527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}