On 8/16/2010 11:50 PM, pyotr filipivich wrote:

Ah, but with a CNC machine, you get to bonch parts of a higher
precision and tolerances (as well as expense) at a rate far exceeding
those possible with manual machining centers.

Especially given that a human will invariable and instinctively back off
as soon as things start making grunching noises, whereas a CNC will
happily continue feeding at the programmed rate until something stalls
or breaks...


Jon

On 2010-08-17, Pete C. wrote:
Well, the "real" controls do monitor axis servo load limits and the like
and will trip e-stop on those limits, but on those big machines they can
do a lot of damage without nearing their limits. I've seen clamp bars
and vises with big slots milled through them when someone goofed. To the
machine it was just a normal cut with normal loads.

I have seen really milled out vises at some places too.

i

On 2010-08-17, Larry Jaques wrote:
On Mon, 16 Aug 2010 21:05:21 -0500, Ignoramus28874
wrote:

On 2010-08-16, Gunner Asch wrote:
On Mon, 16 Aug 2010 14:40:42 -0500, "Robert Swinney"
wrote:

Iggy,

It really seems your zeal for CNC has surpassed your level of manual craftsmanship. Why not slow
down a bit and stop trying to digitize your entire life??

What..and have him not learn what the sound of CRUNCH! SPOING!BANGRATTLE
is? Thats the sound of tooling shattering and bounching off the walls.

I already broke 2 endmills in about 3 weeks of machining with this
CNC.

So you're fuhmiller with bounching noises, I see. What diameter were
they and how did you break them? Did you learn from the noise?


Actually, this is an extremely non-violent machine, very user
friendly. Stuff just does not fly too far due to low RPM.

Once I broke an endmill because it gummed with aluminum and was
stuck.

Another time, the endmill was in the hole and I accidentally commanded
the table to move horizontally.

All things considered, knowing that I already used the mill quite a
bit and tried a few things, having just two end mills broken is not so
bad.

i

"Pete C." on Tue, 17 Aug 2010 09:15:28 -0500
typed in rec.crafts.metalworking the following:

Jon Anderson wrote:

On 8/16/2010 11:50 PM, pyotr filipivich wrote:

Ah, but with a CNC machine, you get to bonch parts of a higher
precision and tolerances (as well as expense) at a rate far exceeding
those possible with manual machining centers.

Especially given that a human will invariable and instinctively back off
as soon as things start making grunching noises, whereas a CNC will
happily continue feeding at the programmed rate until something stalls
or breaks...

Jon

Well, the "real" controls do monitor axis servo load limits and the like
and will trip e-stop on those limits, but on those big machines they can
do a lot of damage without nearing their limits. I've seen clamp bars
and vises with big slots milled through them when someone goofed. To the
machine it was just a normal cut with normal loads.

"Missed it by that much!" Crap.

pyotr

--
pyotr filipivich
We will drink no whiskey before its nine.
It's eight fifty eight. Close enough!

On Tue, 17 Aug 2010 10:24:48 -0500, Ignoramus11933
wrote:


All things considered, knowing that I already used the mill quite a
bit and tried a few things, having just two end mills broken is not so
bad.

i

Indeed. Im quite impressed at your evolution. You are doing very well.

Gunner

--


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The more you present a leftist with factual evidence
that is counter to his preconceived world view and the
more difficult it becomes for him to refute it without
losing face the chance of him calling you a racist, bigot,
homophobe approaches infinity.

This is despite the thread you are in having not mentioned
race or sexual preference in any way that is relevant to
the subject." Grey Ghost

What's that Lassie? You say that Jon Anderson fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Tue, 17 Aug 2010 07:05:10 -0800:

On 8/16/2010 11:50 PM, pyotr filipivich wrote:

Ah, but with a CNC machine, you get to bonch parts of a higher
precision and tolerances (as well as expense) at a rate far exceeding
those possible with manual machining centers.

Especially given that a human will invariable and instinctively back off
as soon as things start making grunching noises, whereas a CNC will
happily continue feeding at the programmed rate until something stalls
or breaks...



It also doesn't care how loud you scream, or how much you bleed.
Keep within range of the E-stop buttons.
--

Dan H.
northshore MA.

On 2010-08-17, Ignoramus28874 wrote:
On 2010-08-17, dan wrote:
What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.


These two should work well for what I want.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=130421610161

They will do for onesy-twosy operations -- though I would
consider three to be better, so you could clamp in a third spot before
releasing the first -- less chance of the workpiece shifting -- rotating
around the sole remaining clamp pressure point.

But if you are doing a lot of something, I would suggest the
De-Sta-Co toggle clamps.

Drop into the MSC page (or catalog) and look at item 3
#65189706 -- with a soft pad to avoid marring. They are also available
with simply the slotted bar which you can put a bolt into -- and perhaps
polish the head a bit first if you want a heavier grip. This one is a
1000 lb clamp capacity for $21.07 each. Others are down to 600 lb
capacity -- or much less for really small ones.

Anyway -- when you operate the lever, the clamping bar lifts 90
degrees as the handle pivots out of the way.

There are other versions which push horizontally -- to hold the
workpiece against a stop on the table to start in the proper position.

Anyway -- they are very quick to operate to move the one out of
the area about to be machined and to lower another into the area already
machined.

To see the whole collection -- at least one other brand besides
De-Sta-Co -- just search on "Toggle Clamp". At least the first page
does not show anything which does not belong -- unlike with many
searches on their site.

Of course, you can find them on eBay -- or in one of your usual
lucky find areas.

Enjoy,
DoN.

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On Tue, 17 Aug 2010 23:58:34 GMT
(dan) wrote:

snip
It also doesn't care how loud you scream, or how much you bleed.
Keep within range of the E-stop buttons.

Hmm... can Voice Recognition be added maybe?

"ARGGggg!" = E-stop

--
Leon Fisk
Grand Rapids MI/Zone 5b
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