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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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Engineering software, sines and cosines
My maths is appalling, I am sorry to say. Yesterday I wanted to work out
the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! |
#2
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Engineering software, sines and cosines
On 2010-04-30, Chris Wilson wrote:
My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! Almost any scientific calculator from your local discount store should do trig. What you need is not just the calculator, you need a textbook on coordinate geometry and trigonometry. You need to know what to ask from a calculator. i |
#3
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Engineering software, sines and cosines
"Chris Wilson" wrote in message ... My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! If I'm feeling real lazy or its toooo hard I sometimes use my mechanical cad dwg package to work out distances etc. |
#4
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Engineering software, sines and cosines
On Apr 30, 8:54*am, Chris Wilson wrote:
My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! A cheap CAD package would probably do it, or a little work with memorizing what the trig functions REALLY mean along with a dollar store "scientific" calculator would do as well. I've picked those up for as little as $6 from Big Lots. I find the calculator is faster for most things. Holes in a circle might be the break-point. It also helps to know that the length of the hypotenuse of a 45 degree right triangle is the square root of 2 times either side in length, a special case along with a 30-60-90 triangle. See Pythagorean theorem. From that it should be dead easy to work out X-Y, even with a pocket four-banger calculator. Banging away at problems 5 days a week at 7:30 in the morning for a couple of years will embed this stuff permanently. Stan |
#5
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Engineering software, sines and cosines
On Fri, 30 Apr 2010 15:54:19 +0100, Chris Wilson
wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! http://www.freecad.com/ |
#6
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Engineering software, sines and cosines
On Fri, 30 Apr 2010 15:54:19 +0100, Chris Wilson
wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! Since you have a Windows machine, you already have a decent calculator as part of the O/S. Just fire up calc, and if it comes up as a 4-function, switch to "Scientific" from the View menu. The setting should stick unless you have a Naz^H^H^H control freak IT guy limiting your permissions. Many enhanced keyboards even have a handy dedicated key to fire it up, right over the number pad. BTW, the Windows 7 calculator is fancier with more modes and is more eye-candy-like than the old reliable XP/Win2k calculator, but they did manage to break one useful ability of the older calculator. If you do some calculations in floating point decimal and then want to convert it to hex, you can't without re-entering the numbers because it clears when you change from Scientific to Programmer modes. Best to copy the old one over if this matters to you. In this case, you could use sin/cos to calculate the y and x movements required. sin(45°) = cos(45°) = sqrt(2) ~= 0.7071. So if the PCD was 3", you'd multiply the radius (half of that) * sin(45) to get the y motion required (about 1.061") and for 45 degrees, the x motion is the same. Then crank the x back double that (2.123") to drill the left-hand hole, if I understood your description correctly. |
#7
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Engineering software, sines and cosines
On Fri, 30 Apr 2010 15:54:19 +0100, Chris Wilson
wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! Hey Chris, Here's your guy !! http://www.myvirtualnetwork.com/mklotz/ Brian Lawson, Bothwell, Ontario. ps..."centre" ??? Where are you? |
#8
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Engineering software, sines and cosines
Brian Lawson wrote:
On Fri, 30 Apr 2010 15:54:19 +0100, Chris Wilson wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! Hey Chris, Here's your guy !! http://www.myvirtualnetwork.com/mklotz/ Brian Lawson, Bothwell, Ontario. ps..."centre" ??? Where are you? BOLTCIRC.ZIP is the program you want from Mr. Klotz's site. You will have to unzip it and run it as a cmd line program. Works fine. The output data is placed in a file boltcirc.dat that you can open with notepad. Keep in mind that 0 degrees is at 3 o'clock for purposes of orientation 90 degrees at 12 o'clock. I use Machinist Tool Box PDA on my palm for this but I *can* do it the hard way, just Wes |
#9
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Engineering software, sines and cosines
On Apr 30, 10:54*am, Chris Wilson wrote:
My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! You want a bolt circle calculator. Here's a simple online one (nothing to load into your computer): http://www.selectsmart.com/darex/bolt_cir.cgi Here's its solution to your problem: 2 holes in pattern Bolt Circle Diameter: 3 Centered at: (0,0) Starting angle: 45° (45° 0' 0" ) Ending angle: 45° (45° 0' 0" ) ( 1.0607 , 1.0607 ) ( 1.0607 , 1.0607 ) |
#10
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Engineering software, sines and cosines
On Fri, 30 Apr 2010 14:26:44 -0700 (PDT), rangerssuck
wrote: On Apr 30, 10:54*am, Chris Wilson wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! You want a bolt circle calculator. Here's a simple online one (nothing to load into your computer): http://www.selectsmart.com/darex/bolt_cir.cgi Here's its solution to your problem: 2 holes in pattern Bolt Circle Diameter: 3 Centered at: (0,0) Starting angle: 45° (45° 0' 0" ) Ending angle: 45° (45° 0' 0" ) ( 1.0607 , 1.0607 ) ( 1.0607 , 1.0607 ) Hmm.. that's two holes in the same location. You need to start from here, for some reason they didn't put a link back to the form page that I can see. http://www.selectsmart.com/darex/bolt_cir.html I did this (assuming the holes are +/- 45 degrees relative to 12 o'clock). The program take the x-axis (3 o'clock) as 0 degrees and CCW angles as positive from what I can see. 2 holes in pattern Bolt Circle Diameter: 3 Centered at: (0,0) Starting angle: 45° (45° 0' 0" ) Ending angle: 135° (135° 0' 0" ) ( 1.0607 , 1.0607 ) ( -1.0607 , 1.0607 ) |
#11
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Engineering software, sines and cosines
Excel will do trig work.
=sin(rad_number) do help in the upper right sin(number) and it shows info... Martin Chris Wilson wrote: My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! |
#13
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Engineering software, sines and cosines
Chris Wilson wrote:
My maths is appalling, I am sorry to say. Yesterday I wanted to work out the X and Y axis movement on a milling machine to drill two holes opposite one another skewed 45 degrees from the vertical at a known PCD . I had the machine zeroed on the centre of the hole around which these drillings were needed. Took me ages as I have forgotten most of my Trig and I couldn't find a suitable calculator Is there any easy to use engineering software for this sort of thing? It's at times like this a CNC machine seems wonderful Ta! download KwikTrig. Free and easy |
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