On 9/15/25 11:49, [email protected] wrote:
I think that you need to calculate the length of an Archimedean spiral to
determine the time to move along it. This page provides a general formula
for arc length using calculus for spirals expressed in parametric or polar
form.
https://www.mathsisfun.com/calculus/arc-length.html
Unforch Ken, while the above is no doubt correct, I still have 2
problems. Not your fault, mine, as my math education stops with simple
8th grade algebra, (I quit school and started fixing the first 30 tube
tv's in '48) is problem #1, #2 is I haven't a clue where to find those
characters on my utf-8 keyboard. I have done some work with
cateranary's(sp?) but not since the '70's to check guy wire tensions on
a 1000' Stainless tower after a legendary Nebraska blizzard left several
tons of ice on the antenna, using the rifle scope derived intercepts on
the wires. Had to make a homemade TDR to tell the tower crew where to
take it apart to find the first of the line burnup that caused. Tower
was a bit crooked but straightened as the weight went away as the ice
ablated. Took around 11 days to thaw it all. I was caught at the site
for 3 days w/o any food in the fridge, when I got plowed out I went to
the drug store for my youngest's special formula and some eats for the
rest of us, and drug it all the last mile to the farmhouse we were
living in at the time, on a 2x6 throw rug slogging thru 2 to 4 foot
drifts. Obviously I was a bit younger then. Now I'll be 91 in about 2
weeks.
Thank you Ken.
-----Original Message-----
From: gene heskett <[email protected]>
Sent: September 15, 2025 11:37 AM
To: Enhanced Machine Controller (EMC) <[email protected]>
Subject: [Emc-users] EDM auto advance Q's
Actually 3 Q's, two of which Peter may be able to answer.
1; in a 7i76D, the 12 volt inputs need a signal of what duration to reliably
detect that a signal has occurred? And what is the maximum voltage that can
be applied to a 12 volt input?
2; how can I determine the predicted elapsed time for a 10 spiral g2/g3 move
which will expand in time as the diameter of the spiral grows?
Thanks everybody.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
