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.
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--- Black Holes are where God is dividing by zero ---