Re: 4th Axis Question.

On Fri, 21 Mar 2008 20:07:49 -0700, BottleBob
<bottlbob@xxxxxxxxxxxxx> wrote:

John R. Carroll wrote:
BottleBob wrote:
John R. Carroll wrote:

BTW, your rotary is accurate to 30 arc seconds and that might have
been problematic. It isn't the .001 degree you thought.

Yeah but I have the specs from HAAS.

ftp.machiningsolution.com/RotaryBrochure.pdf

John:

OK. But 30 arc seconds is like .0083 of a degree. And at 5" comes
out to 5 X sin .0083 or .00073. Do your holes have to be more accurate
than that?

Also, if you rotate in the same direction the repeatability is
supposedly 10 arc seconds or .00024. So someone could program an arc
type "positive approach" for all their holes, and "theoretically" be
within a few tenths, at least on a new Haas HRT210 rotary.
==============
Not to put too fine a point on this, but how do you measure the
"actual" hole location? Tell me its *NOT* gauge pins, a pair of
"verynear" calipers, and a scientific calculator....

Given the type of work, more than likely you are using true
position dimensioning, but then factors such as hole squareness,
straightness, temperature, etc. start to interact at those
tolerances. 2-tenths over 5 inches?


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).
.

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