Re: RE: axis names

Alan wrote:

>what would be an example of say, A motion? I don't think I've seen
>it in my limited researches. Do you know if FlashCut (my touchstone)
>supports it?
>Alan

> A(rotational around X)Engrave a pool cue.

This was my answer.


Alan,

I'm going to assume you saw that and wanted more info.

My flashcut manual (one of the first) makes no mention of 4th axis,
but a quick look at the website http://www.flashcutcnc.com shows
"fourth axis available" in both the software and controller sections.

The A axis is called like any other:
G01 A180.00 F25 (+ or - 360 degrees for some controls/rotary tables)

Many controls allow moves of more than +or- 360 degrees.
+or- 8380.00 is common.

HEY! ANYBODY KNOW WHY THIS IS? 8380twice is 16760. 2^14 is 16384.
wont work. 8380 divided by 360 is 23.2777777777777777777777777777778.
still no help. Maybe it's related to radians? How about it. Anybody
know why control writers use +or- 8380.00 in rotary axes??? I've been
wonderin' this for some time.

Okay Alan, I'm back now :)


Lets cut an oil groove(well, actually 2) in a bronze bushing:
We want it to be helical so the shaft is fully supported.

G90G20G40G80 (safety block)
G0x0y0z.1 (program zero,centered over the end of the bush)
G0x.25 (move to start of 1st slot, x0 is end of bush)
G01 z-.150 F25 (bushing is 1/8 thick, 1" long, okay)
x.75 A-180 (cut slot,G01 is modal, don't need it each line)
g0 z.1 (clear the tool from the part)
X.25 (start of 2nd slot some rotary tables need the A-180 here also)
G01 z-.15 (REAL programs SHOULD be more consistant: spaces,caps)
x.75 A-360 F25 (2nd slot,ABSolute mode, remember?)
g0 z.1 (clear tool from part)
xoyoz0 (not always, but a good habit)

Hope this helps.

Ballendo

P.S. more to follow, after I eat. :) (typed this twice already,
there's some sort of a glitch in the post s/w that ERASES the post if
you hit the....??? spacebar??? at the wrong time.)