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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#13
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Sine Bar Chart?
Jim Wilkins wrote:
On Apr 7, 4:19 pm, RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? I just made one for you in OpenOfficeCalc. In cell A1 enter "1" In cell A2 enter "=A1 + 1 Copy cell A2 and paste it downward to get all the angles to 90. Go a little further to get some extra cells to enter custom angles. In cell B1 enter "=SIN(RADIANS(A1))". This actually gives the sine of the angle in degrees instead of radians. Copy cell B1 downwards. Format column B for 4 or 5 decimal places, one more than the resolution of your gage block set. As a check the sine of 30 is 0.5000, of 45 is 0.7071. Go down to the last filled cell and change the angle to 14.5. The sine is 0.250. That's supposed to be the reason for 14.5 pressure angle gears, from way back when draftsmen drew them full size for pattern makers. In cell C1 enter "=B1 * 5", or whatever the length of your sine bar is. Copy it downward and format the decimals. Jim, that is perfect. thanks much! |
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