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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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#1
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Sine Bar Chart?
Anyone got a simple chart or spreadsheet for a 5" sine bar?
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#2
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Sine Bar Chart?
RBnDFW wrote:
Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com |
#3
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Sine Bar Chart?
On Wed, 07 Apr 2010 13:22:52 -0700, Tim Wescott wrote:
RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? No, it's offset=sin(angle)x5 :-) Zeus books have sines in, as do school tables books (if anyone still prints them). Otherwise, pocket calculators or decent slide rules work... Mark Rand RTFM |
#4
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Sine Bar Chart?
Mark Rand wrote:
On Wed, 07 Apr 2010 13:22:52 -0700, Tim Wescott wrote: RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? No, it's offset=sin(angle)x5 :-) Zeus books have sines in, as do school tables books (if anyone still prints them). Otherwise, pocket calculators or decent slide rules work... Mark Rand RTFM I did get that backwards, didn't I? -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com |
#5
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Sine Bar Chart?
On Wed, 07 Apr 2010 15:19:43 -0500, RBnDFW
wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? ========== Not to put too fine a point on it, but with the proliferation of cheap scientific calculators with the sine function, charts/tables are obsolete. Also you can use the calculator for speed/feed/DoC calculations. for some examples see http://www.walmart.com/ip/Texas-Inst...ulator/1535939 http://www.walmart.com/ip/Casio-FX-3...lator/10248096 http://www.walmart.com/ip/Casio-FX26...lator/10248095 http://www.walmart.com/ip/Sharp-Scie...1WBBK/10992485 Unka George (George McDuffee) ............................... The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953). |
#6
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Sine Bar Chart?
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. jsw |
#7
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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! |
#8
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Sine Bar Chart?
Tim Wescott wrote:
Mark Rand wrote: On Wed, 07 Apr 2010 13:22:52 -0700, Tim Wescott wrote: RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? No, it's offset=sin(angle)x5 :-) Zeus books have sines in, as do school tables books (if anyone still prints them). Otherwise, pocket calculators or decent slide rules work... Hey, I'm the guy that flunked HS trig Or more correctly, I bailed before I failed. |
#9
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Sine Bar Chart?
On Apr 8, 12:09*pm, RBnDFW wrote:
... Hey, I'm the guy that flunked HS trig Or more correctly, I bailed *before I failed. I flunked college technical writing, that was a practice exercise. jsw |
#10
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Sine Bar Chart?
Tim Wescott wrote:
RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? Tim, it is a sine bar. Not an arcsin bar. I love Easy Calc that I run on my palm pda. http://easycalc.sourceforge.net sin(30)*5 returns the expected 2.5 as long as I tell it to use degrees and not radians or gradians. Wes |
#11
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Sine Bar Chart?
On 2010-04-07, Tim Wescott wrote:
RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? Isn't it just angle = arcsin(offset/5")? That is working backwards to ge the angle from the stack size. If you want to calculate the (gauge block) stack size needed to get a specific angle, try: block_stack_needed = sin(angle) * 5 that is why they are called "sine bars". If you have a scientific calculator (like my old HP 15C), you have a sine function in there. Otherwise, pick up an old _Handbook of Chemistry and Physics_ (or any of a number of other reference books) and look for a table of sines which has sufficient digits to give you the accuracy you need. Hmm ... old editions of _Machinery's Handbook_ also have the sine tables. Newer ones have dropped that because of the availability of scientific calculators. (Avoid BASIC in a PC, because it probably does not have enough significant figures to do what you need -- and it also probably is expecting the angles in radians, not degrees. I'm not sure what precision a spreadsheet can give, but unless you can at least ask for "double precision" calculations, forget it. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#12
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Sine Bar Chart?
On Apr 9, 1:41*am, "DoN. Nichols" wrote:
.... I'm not sure what precision a spreadsheet can give, but unless you can at least ask for "double precision" calculations, forget it. * * * * Enjoy, * * * * * * * * DoN. In OpenOfficeCalc 3.0, SIN(30) = 0.50000000000000000000 jsw |
#13
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Sine Bar Chart?
DoN. Nichols wrote:
On 2010-04-07, Tim Wescott wrote: RBnDFW wrote: Anyone got a simple chart or spreadsheet for a 5" sine bar? If you want to calculate the (gauge block) stack size needed to get a specific angle, try: block_stack_needed = sin(angle) * 5 that is why they are called "sine bars". If you have a scientific calculator (like my old HP 15C), you have a sine function in there. Otherwise, pick up an old _Handbook of Chemistry and Physics_ (or any of a number of other reference books) and look for a table of sines which has sufficient digits to give you the accuracy you need. Hmm ... old editions of _Machinery's Handbook_ also have the sine tables. Newer ones have dropped that because of the availability of scientific calculators. (Avoid BASIC in a PC, because it probably does not have enough significant figures to do what you need -- and it also probably is expecting the angles in radians, not degrees. I'm not sure what precision a spreadsheet can give, but unless you can at least ask for "double precision" calculations, forget it. OK, found a iPhone free app calculator with trig functions. that ought to be the ticket. thanks |
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