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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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Gear making (was Calling All Machinists)
On Mon, 29 Jun 2009 07:34:43 -0500, Ignoramus24381
wrote: snip This, from my point of view, can be addressed with a perl script running on a laptop. It could tell me how many turns to make, etc. Something along the lines of what I did with "Egyptian CNC". Ergo, the laptop could say "turn the handle 3 times and stop at XX.XXX". snip One of the major problems is that the rotary tables tend to be calibrated in degrees-minutes-seconds while the spreadsheet will calculate in decimal degrees. If you will send me a good email address i will send a excel program that calculates the decimal degrees for a given number of teeth and then translates those decimal degrees into degrees-minutes-and seconds [rounded to my rotary tables seconds resolution]. If anyone else wants a copy of the spreadsheet send me a good email address. I went ahead and bought the index plate set w/ arms, after I got the rotary table and now have a dividing head. The spreadsheet is currently set-up for a 127 tooth gear [exact metric change gear] but can be adapted to any number of teeth. Note that even the dividing heads with the index plates have problems cutting the larger prime number[100] gears such as 127. Some of the very expensive dividing heads allow split or divided indexing using 2 index plates, but this appears to be a royal pain. For our readers on a tight budget, you can download an excel compatable spreadsheet from openoffice for free. http://www.openoffice.org/product/calc.html I just checked using my copy of openoffice 2.0 and calc opens the spreadsheet but you may need to reset column width. One trick is to use a slitting or slitting saw to remove most of the material before you switch to the gear cutter. Good luck with your gear cutting and let the group know what you learn. Unka' George [George McDuffee] ------------------------------------------- He that will not apply new remedies, must expect new evils: for Time is the greatest innovator: and if Time, of course, alter things to the worse, and wisdom and counsel shall not alter them to the better, what shall be the end? Francis Bacon (1561-1626), English philosopher, essayist, statesman. Essays, "Of Innovations" (1597-1625). |
#2
Posted to rec.crafts.metalworking
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Gear making (was Calling All Machinists)
On 2009-06-30, F George McDuffee wrote:
On Mon, 29 Jun 2009 07:34:43 -0500, Ignoramus24381 wrote: snip This, from my point of view, can be addressed with a perl script running on a laptop. It could tell me how many turns to make, etc. Something along the lines of what I did with "Egyptian CNC". Ergo, the laptop could say "turn the handle 3 times and stop at XX.XXX". snip One of the major problems is that the rotary tables tend to be calibrated in degrees-minutes-seconds while the spreadsheet will calculate in decimal degrees. Well, if I write a script, I can convert decimal degrees into minutes and seconds, no problem. # Untested my $angle = calculateAngleInDegrees( ... ... ... ); my $degrees = int( angle ); my $minutes = int( ($angle - $degrees) * 60); my $seconds = int( ($angle - $degrees - $minutes*60)*60 ); print "Turn handle to $degrees degrees, $minutes minutes, $seconds seconds.\n"; If you will send me a good email address i will send a excel program that calculates the decimal degrees for a given number of teeth and then translates those decimal degrees into degrees-minutes-and seconds [rounded to my rotary tables seconds resolution]. If anyone else wants a copy of the spreadsheet send me a good email address. I went ahead and bought the index plate set w/ arms, after I got the rotary table and now have a dividing head. The spreadsheet is currently set-up for a 127 tooth gear [exact metric change gear] but can be adapted to any number of teeth. Note that even the dividing heads with the index plates have problems cutting the larger prime number[100] gears such as 127. Some of the very expensive dividing heads allow split or divided indexing using 2 index plates, but this appears to be a royal pain. George, I like messing with scripts, so while I greatly appreciate the spreadsheet offer, I would like to try to use my own scripts. For our readers on a tight budget, you can download an excel compatable spreadsheet from openoffice for free. http://www.openoffice.org/product/calc.html I just checked using my copy of openoffice 2.0 and calc opens the spreadsheet but you may need to reset column width. OpenOffice is awesome, I use it all the time, though less now with Google Docs. I have a spreadsheet in google docs that calculates my exact net worth based on prices of stocks and mutual funds that I own etc. The function that they provide for it is called GoogleFinance. One trick is to use a slitting or slitting saw to remove most of the material before you switch to the gear cutter. Good luck with your gear cutting and let the group know what you learn. I will definitely try. Thanks for the encouragement. i |
#3
Posted to rec.crafts.metalworking
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Gear making (was Calling All Machinists)
On 2009-06-30, F George McDuffee wrote:
On Mon, 29 Jun 2009 07:34:43 -0500, Ignoramus24381 wrote: snip This, from my point of view, can be addressed with a perl script running on a laptop. It could tell me how many turns to make, etc. Something along the lines of what I did with "Egyptian CNC". Ergo, the laptop could say "turn the handle 3 times and stop at XX.XXX". snip One of the major problems is that the rotary tables tend to be calibrated in degrees-minutes-seconds while the spreadsheet will calculate in decimal degrees. If you will send me a good email address i will send a excel program that calculates the decimal degrees for a given number of teeth and then translates those decimal degrees into degrees-minutes-and seconds [rounded to my rotary tables seconds resolution]. If anyone else wants a copy of the spreadsheet send me a good email address. I'm sure that Iggy can do that in perl. It is a full strength interpreted programming language with features from just about any language around rolled into it. It probably already has libraries for converting decimal degrees to Degrees/Minutes/Seconds. There are an amazing number of libraries already available for it. But, at least for me -- I have a proper diving head with the index plates and the arms. I went ahead and bought the index plate set w/ arms, after I got the rotary table and now have a dividing head. Good. The spreadsheet is currently set-up for a 127 tooth gear [exact metric change gear] but can be adapted to any number of teeth. Note that even the dividing heads with the index plates have problems cutting the larger prime number[100] gears such as 127. Some of the very expensive dividing heads allow split or divided indexing using 2 index plates, but this appears to be a royal pain. For our readers on a tight budget, you can download an excel compatable spreadsheet from openoffice for free. http://www.openoffice.org/product/calc.html Or StarOffice, which comes with Sun's Solaris 10 OS. Sun calls it StarOffice, the rest of the world OpenOffice, but pretty much the same code. I just checked using my copy of openoffice 2.0 and calc opens the spreadsheet but you may need to reset column width. One trick is to use a slitting or slitting saw to remove most of the material before you switch to the gear cutter. And he has an interesting collection of slitting saws with everything else. Good luck with your gear cutting and let the group know what you learn. Indeed so, 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 --- |
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