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. -- John Kasunich [email protected] ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
