On Thursday 18 October 2007, Kirk Wallace wrote:
On Thu, 2007-10-18 at 00:17 -0400, Jim Coleman wrote:
On 10/18/07, Jon Elson [EMAIL PROTECTED] wrote:
Kirk Wallace wrote:
Thanks again Jon and Chris. What should have been obvious
turns
... snip
interference
Hi,
I'm building a stepper configuration from 2 old floppy stepper motors,
and use quadrature signals to control them.
For the hal-configuration I started with the stepper_mm config and
modified it to output quadrature signals.
the steppers move when a jog in Axis, without following errors (even
We picked up a free oversized transformer for our shop 3 phase and the inrush
would trip the breaker so it was useless to us.
John
On 17 Oct 2007 at 11:17, [EMAIL PROTECTED] wrote:
Mark already said that the transformers are at least twice as
big has he really needs.
But they are free
if there is a ground loop somewhere in your setup, it won't conduct any
current unless it's ... a loop! so when you disconnect the sensor, it
breaks the circuit; no current is induced in the wires by stray magnetic
fields, and you dont see any voltage.
if the noise were 'coming from the
Gene Heskett wrote:
A possible test to see if its VFD generated noise would be to see if it
largely goes away when the motor is at full speed, and gets progressively
worse as the speed is lowered.
Basically, look for a correlation between spindle speed and the extra noise
pulses.
A
Jim Coleman wrote:
i was thinking the light bulb idea when i read it, i remember reading an
article on a homebuilt 1000 watt audio amp, he did that because of the
inrush current tripping a breaker. i was just wondering how many bulbs in
parallel it would take to handle the current without
It should be possible to use a slightly higher current breaker or one with
longer time delay for magnetic devices? Failing that a knife switch with time
delay fuses should handle the job.
Rayh
On Thu, 18 Oct 2007 06:06:15 -0500, Enhanced Machine Controller (EMC)
On Thu, 2007-10-18 at 09:38 -0400, John Kasunich wrote:
Gene Heskett wrote:
A possible test to see if its VFD generated noise would be to see if it
largely goes away when the motor is at full speed, and gets progressively
worse as the speed is lowered.
Basically, look for a
Another possible trouble is that your motor frame is not grounded with a low
impedance to earth ground. If this is the case, capacitance from motor
windings to the motor frame will couple switching spikes from your VFD into
your encoder via the motor shaft or encoder cover (metal covers make
John Thornton wrote:
We picked up a free oversized transformer for our shop 3 phase and the inrush
would trip the breaker so it was useless to us.
You could probably put light bulbs or reistors in series to
magnetize the transformer core in sync with the line, then shunt
the resistance out.
Kirk Wallace wrote:
I used the existing cable which has four shielded twisted pairs. I have
one pair for each A, B, I and power.
Are the shields grounded at both ends?
also what about an inductor or capacitor at the encoder in its power
line to help smooth any noise introduced there?
John Kasunich wrote:
Gene Heskett wrote:
A possible test to see if its VFD generated noise would be to see if it
largely goes away when the motor is at full speed, and gets progressively
worse as the speed is lowered.
Basically, look for a correlation between spindle speed and the extra
Kirk Wallace wrote:
I totally underestimated and overlooked the issues involved with VFD's.
I guess they aren't a simple plug and play kind of thing. I plan on
using allot more VFD's in the future and developing experience will not
only help now but in the future.
I'll be interested to hear
Hi all,
I was wondering if anyone could suggest some open-source software for
generating toolpaths for making signs.
Apparently the preferred kind of font is called a stick font or
single stroke font and I have found that there are quite a few
commercial packages that do this. We have been
Jon Elson wrote:
I did have some non-CNC interference from my mill's VFD, mostly
to my computer monitor. I put a Corcom-type line filter box on
the line in to the VFD, and it solved the problem.
Jon
I had the same thing with the fractional HP VFD on my drill press.
It was only running
Patrick Ferrick wrote:
Hi all,
I was wondering if anyone could suggest some open-source software for
generating toolpaths for making signs.
http://timeguy.com/cradek/truetype
Regards,
John Kasunich
-
This SF.net
At 01:45 PM 10/18/2007, you wrote:
Hi all,
I was wondering if anyone could suggest some open-source software for
generating toolpaths for making signs.
Apparently the preferred kind of font is called a stick font or
single stroke font and I have found that there are quite a few
commercial
I'm trying to learn how match8 works in a hal file. As I understand if the
match8.x.b0
is true and the match8.x.a0 is true then the match8.x.out should be true...
This the the hal file
# components
loadrt threads name1=partest_thread period1=100
loadrt hal_parport cfg=0x0378
addf
you could try autotrace with the -centerline option. it wouldn't give you
the z-depth for different widths with a conical cutter, but it might look
ok anyway.
On Thu, 18 Oct 2007, Patrick Ferrick wrote:
I was wondering if anyone could suggest some open-source software for
generating toolpaths
John Kasunich wrote:
Patrick Ferrick wrote:
Hi all,
I was wondering if anyone could suggest some open-source software for
generating toolpaths for making signs.
http://timeguy.com/cradek/truetype
Well, at least the sample on the first page is not a stick
font. It has line width. For
Patrick Ferrick wrote:
Hi all,
I was wondering if anyone could suggest some open-source software for
generating toolpaths for making signs.
Apparently the preferred kind of font is called a stick font or
single stroke font and I have found that there are quite a few
commercial
You must addf match8.0 partest_thread or its outputs will never be
updated.
Jeff
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