http://www.sheetmetalworkbook.com DVC Planners Precision Sheet Metal Layout Manual #1, The FREE Online Version. A basic workbook to teach all about developing sheet metal flat patterns. en-us Mon, 06 Feb 2012 08:32:46 CST Mon, 06 Feb 2012 08:32:46 CST http://www.sheetmetalworkbook.comhttp://www.sheetmetalworkbook.com/My_Account/cgi-bin/tools/logos/sheetmetalworkbook.com.png http://www.sheetmetalworkbook.com/ DVC Planners Precision Sheet Metal Layout Manual #1, The FREE Online Version. A basic workbook to teach all about developing sheet metal flat patterns. Mon, 06 Feb 2012 08:32:46 CST http://www.sheetmetalworkbook.com/articles/151419/Page-21:-More-on-Bend-Deduction... MORE ON BEND DEDUCTION When using this bend deduction method to calculate the developed length, dimensions must always be from apex to apex. In all of the ex-amples below the developed length would be: Dim 1 - Bend Ded. + Dim 2 Flat length = Dim 1 - B.D. + Dim 2 Bend Deduction Problems Bend Radius = 3/32 Material Thickness = .063 ... 2011-12-31 http://www.sheetmetalworkbook.com/articles/151426/Page-22:-90-Degree-Bends... 90 DEGREE BENDS When developing flat length for 90 degree bends always make sure the dimensions are outside to outside. Using the example to the right let us say the material thickness is .050 and the bend radius is .032. Our bend allowance would be (.0078 x .050 + .01743 x .032) x 90 = .085 Now we can calculate th... 2011-12-31 http://www.sheetmetalworkbook.com/articles/150332/Page-19:-Bend-Allowance... BEND ALLOWANCE Bend Deduction, Setback, Bend Allowance, these terms all across the country seem to have no consistent meaning. They are all used to mean the same thing or different things. I will define these terms by what is usually accepted by most sheet metal mechanics that I know. These terms may be used differently by ... 2011-12-10 http://www.sheetmetalworkbook.com/articles/150333/Page-18:-Bending... BENDING Three terms used for forming sheet metal. AIR BENDING: 3 point contact of metal. Punch tip and die edges. Air bending is what most bend allowance formulas are based on. When form­ing mild steel the inside bend radius is based upon bottom die V open­ing. It is close to 15.6 percent of the die opening. Therefore a 3/8 die opening wo... 2011-12-10 http://www.sheetmetalworkbook.com/articles/150334/Page-20:-Bend-Deduction... BEND DEDUCTION BEND DEDUCTION: Bend Deduction is the difference from the start of the radius to the apex of the angle times two minus the bend allowance. To state it simply: Bend deduction = D + D - bend allowance &n... 2011-12-10 http://www.sheetmetalworkbook.com/articles/149833/Page-17:-NC-Angular-Orientation... ANGULAR ORIENTATION CONCERNINGMOST NC & CAD/CAM SYSTEMS ... 2011-11-30 http://www.sheetmetalworkbook.com/articles/144648/Page-16:-Coordinate-Systems... Coordinate Systems Back to:http://www.sheetmetalworkbook.com/ http://www.dvcplanners.com ... 2011-09-01 http://www.sheetmetalworkbook.com/articles/59857/Page-15-Problem-Solving... Problem Solving 1. What is the diameter of the circle?___________________________ 2. What is the circumference of the circle?______________________ 3. How many degrees is the angle A?____________________________ 4. How many degrees is the angle B?____________________________ 5. What is the length of the line ... 2010-04-08 http://www.sheetmetalworkbook.com/articles/35875/Page-3-English-Decimal... ENGLISH DECIMALS Just a little note about English decimals. In the precision sheet metal trade we work with dimensions either in English or Metric units. When working in English units our dimensions are based on a piece of measurement called an inch. There are still a lot of places using fractions of an inch on their blueprin... 2009-09-29 http://www.sheetmetalworkbook.com/articles/34851/Page-2-Order-in-the-Math... ORDER IN THE MATH When doing mathematical equations there is a rule that we must follow. A fancy term for this is mathematical hierarchy. This is a very important rule, if you don't follow it you can make some big time mistakes. One good thing about math rules (unlike English) there are no exceptions. Most good calculators will f... 2009-09-22 http://www.sheetmetalworkbook.com/articles/34446/Page-14-Solving-Triangles... SOLVING TRIANGLES 1. C =_________2. D =_________3. E =_________ The Following problem will probably be one of the most frequent trig problems that you will encounter while developing flat patterns with acute bend angles (See Acute Bends Page:40... 2009-09-20 http://www.sheetmetalworkbook.com/articles/34291/Page-13-Intersecting-Lines-and-Angle-Relations... INTERSECTING LINES AND ANGLE RELATIONS The two horizontal line segments are parallel to each other and perpendicular to the vertical line segment. For this illustration the # angle should not be less than 90 degrees and the * angle should not be greater than 90 degrees although most of the relations will ... 2009-09-19 http://www.sheetmetalworkbook.com/articles/26255/Page-12:-Pythagorean-Theorem... PYTHAGOREAN THEOREM A2+ B2= C2 NOTE DIAGRAM BELOW:A2+ B2= C216 + 9 = 25 Alterations ofPythagorean Theorem C2- B2= A2 25 - 9 = 16 C2- A2= B2&n... 2009-08-24 http://www.sheetmetalworkbook.com/articles/18636/Page-10:-Right-Angle-Triangles... &n RIGHT ANGLE TRIANGLES The right angle triangle is a very important and useful tool in sheet metal flat pattern development. Triangle rules state that the sum of all three angles in a triangle = 180°. If one angle = 90° then it is called a right angle triangle. If there is at least two known ... 2009-07-05 http://www.sheetmetalworkbook.com/articles/18645/Page-11:-Where-Two-Sides-are-Known... WHERE TWO SIDES ARE KNOWN Now you try it! THREE MORE IMPORTANT KEYS: sin-1cos-1tan-1 IF TWO SIDES ARE KNOWN SOLVE&nb... 2009-07-05 http://www.sheetmetalworkbook.com/articles/16134/Page-8--Looking-at-Trig... LOOKING AT TRIGONOMETRY A COMMON SENSE APPROACH Let's take a common sense approach looking at right angle triangles and how trigonometry is used. Every book you learned from probably dealt with terms like side adjacent, side opposite, etc. etc... Well I am going to use easy terms like... 2009-06-12 http://www.sheetmetalworkbook.com/articles/16151/Page-9:-Common-Sense-Formulas... SOME COMMON SENSE FORMULAS: IF YOU KNOW TWO SIDES And you want to know an angle. Use Sketch Below(from page 8) * If you know the legs only use the inverse tangent. Examples: &nbsp... 2009-06-12 http://www.sheetmetalworkbook.com/articles/14088/Page-7:Triangles... TRIANGLES Facts: 1. Has 3 angles and 3 sides. 2. Sum of all angles = 180 degrees 3. Isosceles triangle has two sides that are equal 4. Equilateral triangle has three equal sides And three equal angles, which are always 60 degrees each, (180 ÷ 3) remember rul... 2009-05-30 http://www.sheetmetalworkbook.com/articles/13979/Page-6:-Circles... CIRCLES Circle: Every point on a circle is equidistance from some fixed point, which is the center. A circle is divided into 360 degrees. Only one circle can pass through three points not in a straight line. Chord: A length of ... 2009-05-28 http://www.sheetmetalworkbook.com/articles/11859/Page-5:-Planes,-Plane-and-Solid-Geometry... PLANES, PLANE AND SOLID GEOMETRY The kind of geometry that we will be using in this manual is called plane geometry. Plane geometry deals with points, lines, polygons (A shape with more than two sides, i.e. square, triangle, hexagon, etc.) and circles on a flat surface (plane). Sheet metal flat patterns are done in plane geom... 2009-05-16 http://www.sheetmetalworkbook.com/articles/7191/DVC-Planners-Layout-Manual-TOC... Please Donate if you find this workbook useful and to help me keep improving the online version. We are Thankful for any and all amounts! Even the smallest amount is appreciated and beneficial. So far as of **09/29/09 no one has donated anything and this site gets about 30 hits per day. So if you are thinking :man I b... 2009-04-19 http://www.sheetmetalworkbook.com/headlines/news/Laser Fabrication Laser Fabrication News Headline :DVC Planners Precision Sheet Metal Layout Manual #1, The FREE Online Version. A basic workbook to teach all about developing sheet metal flat patterns. Mon, 06 Feb 2012 08:32:46 CST http://www.sheetmetalworkbook.com/resources/partners Other Resources :DVC Planners Precision Sheet Metal Layout Manual #1, The FREE Online Version. A basic workbook to teach all about developing sheet metal flat patterns. Mon, 06 Feb 2012 08:32:46 CST http://www.sheetmetalworkbook.com/exm/Precision_Measuring_Tools/     2009-05-01 http://www.sheetmetalworkbook.com/exm/Buy_Printed_Manual/ 2009-05-28 http://www.sheetmetalworkbook.com/exm/Other_Books/   ... 2009-06-06 http://www.sheetmetalworkbook.com/exm/Software_and_Calculators/   ... 2009-06-12 http://www.sheetmetalworkbook.com/exm/Forum/ Sheet Metal Forum,   All about Sheet Metal Layout related with Cad/Cam. Your input is very helpful.Sheet Metal Cad/Cam ... 2010-01-22 http://www.sheetmetalworkbook.com/exm/Math_Helps_For_Sale/   Precision Sheet Metal Stuff for Sell 2011-10-07 http://www.sheetmetalworkbook.com/news/1447831/-Research-and-Markets:-Laser-Ablation-in-Liquids:-Principles-and-Applications-in-the-Preparation-of-Nanomaterials... Research and Markets has announced the addition of the "Laser Ablation in Liquids: Principles and Applications... 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