On Mon, 30 Sep 2013 17:33:55 -0700, you wrote:
On Mon, 2013-09-30 at 18:23 -0600, Gregg Eshelman wrote:
How about trying a different resin? Call Smooth-On and see if they have
any recommendations that may fit your needs.
Or perhaps an epoxy might work better? There are many manufacturers of
The PSU on my milling machine blew up again last night. This is the
second time it has happened. I haven't pulled the box out of the
machine yet, but I expect to see this again:
https://picasaweb.google.com/lh/photo/xxfP_tT7Ae0op6GxUhSDvtMTjNZETYmyPJy0liipFm0?feat=directlink
Which is a power
So far, I have realized a number of mistakes.
#1. I didn't wax the modeling board the first round, so the silicone
surface is much too porous. Because of this, the surface releases bubbles
during molding process and any residual moisture causes issues as well.
#2. The back suction action
Maybe look into using a starter solinoid maybe 12 or 24 v I know but
should handle a fair amount of current failing that could you use all
three phase contacts of a three phase contactor or even four contacts
if you get the spare as n/o
John d norton
C/o John Norton Fabs Ltd
On 2 Oct 2013, at
On 2 October 2013 11:09, john d norton j...@jnfabs.co.uk wrote:
Maybe look into using a starter solinoid maybe 12 or 24 v I know
It really needs to have interlocked NO / NC contacts and be controlled by 240V.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
Various companies make contactors intended for DC drives. They
have a conventional three-pole frame, but the center pole has NC
contacts (the two outer poles have conventional NO contacts). The
center pole is intended to apply a DB resistor across the motor
armature after the outer poles
On 2 October 2013 13:54, John Kasunich jmkasun...@fastmail.fm wrote:
Various companies make contactors intended for DC drives.
Ah, yes, that looks approximately perfect apart from the cost and the
delivery time. (I can't see any on eBay UK)
I have ordered the 220VDC rated contactor from RS,
The relay or contactor you use must be a break before make style. I like
contactors better as the distance between contacts tends to be larger, so
more time between break make.
A larger value resistor for bleed off might be in order.
I usually put a very large value resistor across the power
Contactors are generally a lot more robust than relays. Since switching
to contactors on my supplies I have never had any welded contact issues.
I normally switch the AC before the rectifier instead of the DC. This
does mean the smoothing caps are permanently connected to the load but
in my
On 2 October 2013 14:55, jrmitchellj . jrmitche...@gmail.com wrote:
The relay or contactor you use must be a break before make style
The ones I have been using are meant to be, but they are not
force-guided to ensure it.
A larger value resistor for bleed off might be in order.
I usually put a
Large in value sense.
--J. Ray Mitchell Jr.
jrmitche...@gmail.com
(818)324-7573
“Truth is treason in the Empire of Lies.” — Ron Paul
On Wed, Oct 2, 2013 at 7:47 AM, andy pugh bodge...@gmail.com wrote:
On 2 October 2013 14:55, jrmitchellj . jrmitche...@gmail.com wrote:
The relay or
On 2 October 2013 16:00, jrmitchellj . jrmitche...@gmail.com wrote:
Large in value sense.
The problem here is that my capacitors are large (in both senses) and
so a large value resistor will take a long time to discharge the caps.
--
atp
If you can't fix it, you don't own it.
On Wed, Oct 2, 2013, at 10:47 AM, andy pugh wrote:
I guess I could use a 250W resistor, which is 30s to 5V, or a 1kW
resistor, which is 7.5 seconds to 5V. But both seem wasteful, and I am
not sure I have the space.
(Also quite expensive:
I'm getting joint following errors on my Z-Axis when I increase the
jog speed above ~1015 mm/min.
I also see it on X (and presumably Y) when I increase its max speed to
over 2336 mm/min; not quite linear given Z has twice (4mm/rev) the pitch
of X (2mm/rev) with the same microstepping (800/rev).
On Wed, 2 Oct 2013, Russell Brown wrote:
Date: Wed, 2 Oct 2013 17:08:50 +0100 (BST)
From: Russell Brown russ...@lls.lls.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Following Error with Steppers
Quoth John Kasunich.
$13 gets the same ohms and watts, but can run continuously if needed:
http://www.ebay.com/itm/131001379245
That's brilliant... stick a kettle on top and Andy automatically gets a
nice cuppa when he's finished making chips :-)
--
Regards,
Russell
Andy,
I think you need to add a sealed in relay on your input power contactor
circuit. You start the machine by pushing a power on button which has
a seal in contact to hold the contactor in place after the button is
released. When the power drops out the contactor drops out and will
not
On 2 October 2013 17:33, Dave Cole linuxcncro...@gmail.com wrote:
When the power drops out the contactor drops out and will
not pull back in when the power recovers unless you push the power on
button.
I think I am happy to trust this to HAL. I may add an input to HAL
from the contactor
Quoth Peter C. Wallace.
On Wed, 2 Oct 2013, Russell Brown wrote:
It's a stepper based system using a Mesa 5I25 and the standard
BASE_PERIOD of 50us which should allow 20,000 steps per second
(according to TFM).
There should be no base thread at all with hardware stepgens
(it will make
andy pugh wrote:
I think that the failure mode is that, in the case of a power glitch,
the crowbar relay switches and is discharging 300V DC at a fair
current, then the power returns and the NC contact tries to break 300V
10A and welds the NC contacts closed. Then the NO contacts close and
we
You might post this on the forum in the pncconf section, it does sound
like a little bug with pncconf.
Is this a 5i25/7i76 combo? You might just try a plain config that is
known to work...
http://gnipsel.com/linuxcnc/configs/index.html
JT
On 10/2/2013 12:26 PM, Russell Brown wrote:
Quoth
In case people don't know, there will be a CNC-related meeting October
5th (Saturday) in Wheaton, IL. Contact saku...@gmail.com
for more info, or check http://www.osmoces.org/
It is at the IIT Rice campus.
I'll be there representing LinuxCNC, and bring along my minimill
to demo. I will give a
On 2 October 2013 18:26, Russell Brown russ...@lls.lls.com wrote:
loadrt abs names=
loadrt lowpass names=
This is a stepfconf bug. I can't recall what prompts it. I thought it
was fixed. (it tries to load a bunch of components with blank names,
and then their pin names collide)
I have a Highz-720 CNC machine from Heiz in Germany .
I cant get EMC to work with it.I run Linux-CNC 2.4.6
I also have another CNC machine for which EMC works perfectly!
Any suggestions? Anyone else has this combination?
Rindert Schutten
Designer/Owner SchuttenWorks
On 2 October 2013 18:28, Jon Elson el...@pico-systems.com wrote:
If this is the case, the contacts will still be welded, so open up the
relay and examine it.
I will, but as I still have the welded relay from last time, I think I
know that it can happen.
Normal relays are severely derated
On Wed, Oct 2, 2013, at 01:58 PM, andy pugh wrote:
On 2 October 2013 18:28, Jon Elson el...@pico-systems.com wrote:
or use a FET to control the dump resistor.
I would like to do this, but I am not sure how to wire a FET to
discharge the cap when AC power is removed (Whereas an NC
That could work as well.
I thought this was part of your safety circuit to bring the power supply
voltage down to zero ASAP. As in the motor is running away and I need
to kill the drive.
Dave
On 10/2/2013 1:11 PM, andy pugh wrote:
On 2 October 2013 17:33, Dave Cole
Just wire the relay to the AC line. Connect the resistor to the COM NC
contacts. Relay connects bleeder resistors when AC line is removed. No
need to get fancy.
Stephen
On Wed, Oct 2, 2013 at 2:43 PM, Dave Cole linuxcncro...@gmail.com wrote:
That could work as well.
I thought this was
On 2 October 2013 20:41, Stephen Dubovsky smdubov...@gmail.com wrote:
Just wire the relay to the AC line. Connect the resistor to the COM NC
contacts. Relay connects bleeder resistors when AC line is removed. No
need to get fancy.
That was what I thought.
Power up brakes?
There were nine of these at the power source side in the mill I am
retrofitting. They are grouped in three. I guess they have something to do
with the power-on process. Or energy dumping when stopping the spindle.
On top of that I have no idea why they are connected like this.
2013/10/3 Sven Wesley svenne.d...@gmail.com
Power up brakes?
There were nine of these at the power source side in the mill I am
retrofitting. They are grouped in three. I guess they have something to do
with the power-on process. Or energy dumping when stopping the spindle.
On top of that I
Probably braking resistors for the spindle. The resistors are
connected across the 3 phases of the motor to bring the motor to a rapid
stop.
Looks like they are wired in a Wye or Star connection..One center
connection and the three phases which probably connect to a contactor
which is
From: bodge...@gmail.com
Date: Wed, 2 Oct 2013 18:47:08 +0100
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Following Error with Steppers
On 2 October 2013 18:26, Russell Brown russ...@lls.lls.com wrote:
loadrt abs names=
loadrt lowpass names=
This
On 10/02/2013 12:40 PM, Jon Elson wrote:
In case people don't know, there will be a CNC-related meeting October
5th (Saturday) in Wheaton, IL. Contact saku...@gmail.com
for more info, or check http://www.osmoces.org/
It is at the IIT Rice campus.
I'll be there representing LinuxCNC, and
TJoseph Powderly wrote:
Wow, thx Jon
need anything? I'm in Elgin, could save you carrying stuff
registered / bought tix already
I hadnt heard _anything_ about this
thx
Yes, this is more a mechatronics sort of thing than specifically CNC, but
I think there will be significant interest
35 matches
Mail list logo
