On Tuesday 17 November 2015 11:35:34 John Kasunich wrote: > On Tue, Nov 17, 2015, at 11:10 AM, Gene Heskett wrote: > > On Tuesday 17 November 2015 10:44:02 John Thornton wrote: > > > You can use the ruler from a square... > > > > A foot out, my square is in 1/16ths. For this, that never gets to > > rotate speed so it won't fly. ;-) I go by the errors I see. If the > > right hand finger is to narrow, my board width is too big & vice > > versa. > > It doesn't matter what the markings on the square are. It just > matters how long it is from end to end. > > Just to be clear - we are talking about using the ruler from a > combination square. > > Hold a scrap against one edge of your board. Put one end of the > ruler against the scrap. Put the back end of your dial caliper > against the other end of the ruler. That's 12 inches. Open the > calipers so that the "depth gage" rod extends back towards the board > and touches the edge. If the calipers read 1.366", then the board is > 12.000 - 1.366 = 10.634" wide. > > If the ruler isn't exactly 12" it might not matter. If you are trying > to tell if one board is 0.050" wider than another, the length of the > ruler cancels out. If one board reads 1.366 on the caliper and the > next one reads 1.380, the second board is 0.014" narrower than the > first one. > > Actually, an even easier way (for boards less than 9" or so) is to > leave the ruler in the combination square. Set the blade of the > square so it sticks out as far as possible on the 90 degree side - as > long as it sticks out more than the width of the board you are good. > Now you can hold the head of the square against one edge of the board, > and use the depth rod of the caliper to measure back from the end of > the square blade to the other edge of the board. All measurements are > relative, just don't move the square blade in the head. > > On further thought, the square blade doesn't need to stick beyond the > end of the wood. You can place the end of the calipers against the > wood and extend the depth rod back to meet the end of the square. > That has the advantage that you add the square length and the > caliper reading, so bigger caliper readings mean bigger boards. The > other way makes you subtract, so things read backwards.
I had something very similar in mind, but didn't make the connection between a square, and the 12" ruler out of a tri-square. I kept coming up with my 18x24 framing square. :( That ruler from a tri-square I believe would work quite nicely. Thank you John. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Give your users amazing mobile app experiences with Intel XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2-D/3-D games for multiple OSs. Then get your creation into app stores sooner, with many ways to monetize. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
