Thank you BKT for your comments. I had meant in my reply that it is in
fact possible to build a conventional configured lathe which actually
can routinely do the precision required for their application, and
provide some idea of what you have to do to make this work in practice.
You are right that it is difficult measuring anything at that precision.
On Jul 5 2017 1:23 AM, theman whosoldtheworld wrote:
For my little experience as insert for late and mill seller, some
late for
bearing work with cheramic + diamond insert and air flow as
lubrificant
.... these means more or less 20° araund tool, araund bearing in
working
order, plus in most cases machines equipped with oil coolers
circulating
around the spindle and slides ... so most of the lathe concerned is
kept at
a constant temperature ... so the hight precision is possible ... the
most
problem regards the real measure ... if is right the working bearing
is
kostant in measure, it is not so sure that the measure obtained is
the
desired one ... in fact, it is very difficult to measure the
spherical
bearing head ... beyond the only transfer from the working area to
the
measuring chamber changes the measurement itself.
So you do not have to be amazed at the data you bring ... above all
you
have to remember that data is collected in the field and not in the
measurement laboratories.
regards
bkt
2017-07-04 20:39 GMT+02:00 EBo <e...@sandien.com>:
I had studied the design specs for a lathe which was certified
<0.000002"
which used oil bearings instead of air, but from what I have seen
1um is
reasonably doable by mere mortals <https://www.youtube.com/watch
?v=sFrVdoOhu1Q>, however back in the 90's there were only a handful
of
people that could build, tune, and run a machine that would do 20x
the
precision. And yes, you have to temperature and hudity control the
work
(unless the structural members of the machine are made from
something like
Sitall or Zerodur...
On Jul 4 2017 11:05 AM, Marius Liebenberg wrote:
There are lathes that do that already. The lathe is temperature
controlled and the slides run on air bearings with a tolerance of
better than 2 or 3 nano meters. The job is given in 10 micron steps
and I have to work the gcode from there
------ Original Message ------
From: "Niemand Sonst" <nie...@web.de>
To: emc-developers@lists.sourceforge.net
Sent: 2017-07-04 18:01:54
Subject: Re: [Emc-developers] Finest resolution of Lcnc
Gmoccapy is not the issue, as you can add more digits to the DRO on
the
settings page. But if you speak about 0.1 µm it is useless to
build a lathe
on that accuracy, as you will never be able to turn a part at that
accuracy. Just a few degrees temperature difference will destroy
the
repeatability.
Just calculate 1 Degree is 1 µm length difference on every 100 mm.
Norbert
Am 04.07.2017 um 17:15 schrieb Marius Liebenberg:
The DRO's will have to be modified a bit I suppose. In order to
show
the larger travels. The max travel is about 300mm.
------ Original Message ------
From: "andy pugh" <bodge...@gmail.com>
To: "Marius Liebenberg" <mar...@mastercut.co.za>; "EMC
developers" <
emc-developers@lists.sourceforge.net>
Sent: 2017-07-04 13:59:32
Subject: Re: [Emc-developers] Finest resolution of Lcnc
On 4 July 2017 at 12:10, Marius Liebenberg
<mar...@mastercut.co.za>
wrote:
The question I have is - will I be able to control the lathe to
say
0.1
micro meter with Lcnc using the Gmoccapy front end.
You could easily configure the machine to use microns as the
base unit
(then G20 would work in thousandths of an inch).
-- atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils
and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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