On 12 November 2012 02:18, John Kasunich jmkasun...@fastmail.fm wrote:
man oneshot from the command line should get you the documentation.
Or the HTML docs: http://www.linuxcnc.org/docs/html/man/man9/oneshot.9.html
Note that you can set it to produce a pulse on both the rising and
falling
If you want to go with the auxiliary slide idea you can often pick up
short linear slides off eBay for peanuts. Bolt on your torch, add a
switch and the job is done. I have some nice 100mm long THK rails here
that I bought for this purpose.
I have been thinking about this for some time and a
That does sound like a lot of work when a simple acme screw and plain
bearing slides do the trick.
http://gnipsel.com/shop/plasma/z-axis-02.xhtml
John
On 11/12/2012 5:32 AM, Les Newell wrote:
If you want to go with the auxiliary slide idea you can often pick up
short linear slides off eBay
On 12 November 2012 11:32, Les Newell les.new...@fastmail.co.uk wrote:
I have been thinking about this for some time and a while back I came up
with a very different design to all of the others I have seen. First of
all, you don't need or want a ball screw on Z. Z doesn't need to be
hugely
Ok, got pycam going on linux. A couple things..
Generate toolpath generates a flat toolpath, it requires generate all to
generate the curve.
MM seems to be hard coded here??
Is there a place to input retract height?
Anyway, thanks for the help, I think this is going to work. And, thanks
for
Is the reason behind the floating head so there won't be damage if the head
hits an object while cutting, like a warped part sticking up? I'm having
trouble grasping why it's needed. Again, I have very little experience
with plasma tables, being limited to the one machine my former employer
had.
On 12 November 2012 16:00, Jim Coleman drunkenwhip...@gmail.com wrote:
Is the reason behind the floating head so there won't be damage if the head
hits an object while cutting, like a warped part sticking up? I'm having
trouble grasping why it's needed.
While cutting you can measure the
How I would do it:
Use a trapezoidal screw and a delrin nut.
Allow the nut to float axially in its housing, with a microswitch to
detect when it has moved.
Normally the head hangs on the nut. When the head touches then the nut
slides down in its housing, operating the microswitch. (Use the
Ok so I should have re-read the first message in this thread before sending
that. I now see the OP is looking for a way to handle the overtravel from
decel on the Z axis after the probe has touched. I'm guessing that just
probing slow enough to be able to stop quickly is less than desirable
What about, instead of it actually floating, if you were to soften the
structure a little so it could handle the impact of hitting on the probe
operation? I'm envisioning the torch mounted on rubber standoffs
resembling the body mounts to a car. I'd think they could allow enough
flex to keep
I concur with Andy. Some of us use plasma cutter on a daily basis in
production and some of us (Me) do consultation to sort out machine
problems on a daily basis. From experience and seeing many good and many
bad machines, the best production solution is a floating head that will
detach when
I like it when pros weigh in. The machine I used (it was in a production
environment) didn't have any floating mechanism that I could see, but then
again I wasn't at all impressed by that machine. It's homing sequence
would get you within a repeatability of 2 inches or so in both X and Y,
Controlling arc distance has been used as an example of one of the hardest
things to put in a
control loop. The interaction is non linear and chaotic. For cutting most
sheet material, I would
set it up to start at some sane distance and have a long, filtering time
constant in the loop with
On Tue, Nov 13, 2012 at 1:06 AM, Marius Liebenberg
mar...@mastercut.co.zawrote:
I have seen many alternative solutions that all end up being scraped and
redone to floating head.
It is my opinion that the only good and maybe better alternative is the
capacitive sensing THC system. The simpler
On Nov 12, 2012, at 5:56 PM, Yishin Li wrote:
On Tue, Nov 13, 2012 at 1:06 AM, Marius Liebenberg
mar...@mastercut.co.zawrote:
I have seen many alternative solutions that all end up being scraped and
redone to floating head.
It is my opinion that the only good and maybe better
On Mon, 12 Nov 2012, Tom Easterday wrote:
Date: Mon, 12 Nov 2012 19:13:15 -0500
From: Tom Easterday tom-...@bgp.nu
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users]
But not practical for touch off on thin material...
On 11/12/2012 6:30 PM, Peter C. Wallace wrote:
On Mon, 12 Nov 2012, Tom Easterday wrote:
Date: Mon, 12 Nov 2012 19:13:15 -0500
From: Tom Easterday tom-...@bgp.nu
Reply-To: Enhanced Machine Controller (EMC)
I think it would work fine, you can set the torque and velocity quite low. I
think I could touch off on cardboard if I had to :-)
-Tom
On Nov 12, 2012, at 8:14 PM, John Thornton wrote:
But not practical for touch off on thin material...
On 11/12/2012 6:30 PM, Peter C. Wallace wrote:
On
On Tue, Nov 13, 2012 at 9:14 AM, John Thornton bjt...@gmail.com wrote:
But not practical for touch off on thin material...
There's a digital probe signal attached to the plasma head. For thin
material or dry plasma cut, we use digital probe.
-Yishin
Karl
Most good THC equipment give you three signals of importance.
1: The Arc good signal - tells you that the system has pierced and is
ready to move
2: Torch up - tells you the torch is too low
3: Torch down - tells yo the torch is to high
Simple bit of logic will sort out the THC loop I
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