Most of the 140gr 6.5CM data I've seen the bullet slows down past 24" bbl
length. Not sure why you'd want/need a barrel burner either (isn't thats
what people pick 6mm/243 win for?) The stock Hornady 140 ELD-M load is
already comparable ballistics to 300 win mag. I've shot 6.5CM out to
1200yds.
May I opine that noise on one of the encoder lines may cause a zero speed
estimation. If you get two of the same channel edges in a row the encoder
logically must have reversed direction. It must go through zero speed to
change direction. Since a third edge (one on the other channel) is not yet
Why not swap 2&3? Machine base flat and machine keyway for the table.
Then mount to the table and indicate off the table slot to bore the hole
exactly on center? By default they will be parallel.
On Thu, Mar 30, 2017 at 7:02 AM, andy pugh wrote:
> If you have a part with a large bore through t
Just a couple days ago RS was preparing to file for bankruptcy *AGAIN*.
They need to give up.
On Tue, Mar 7, 2017 at 8:18 AM, Ron Ginger wrote:
> On 3/7/2017 4:55 AM, emc-users-requ...@lists.sourceforge.net wrote:
> > BTW I thought all of the Radio Shack stored were closed and the company
> was
running a commercial RTOS its very necessary.
On Fri, Feb 24, 2017 at 2:22 PM, Chris Albertson
wrote:
> On Fri, Feb 24, 2017 at 6:54 AM, Stephen Dubovsky
> wrote:
>
> >
> > Indeed support is VERY useful. There are many more ARM forums (and
> > professional users) the
On Thu, Feb 23, 2017 at 9:47 PM, Erik Christiansen
wrote:
...
> Conversely, why is the ATtiny15
> "best" for the job at hand? Answer: Because it has a few ADC channels, I
> have a few of them in my goodies box, AND I'm set up to develop with
> them.
That last one is big. "set up to develop the
tor
designers that it can happen. No idea what the coercivity of a modern
neodymium magnet is at typical motor operating temp.
On Thu, Jan 26, 2017 at 7:09 AM, Eric Keller wrote:
> On Wed, Jan 25, 2017 at 11:22 PM, Stephen Dubovsky
> wrote:
> > On Wed, Jan 25, 2017 at 10:
On Wed, Jan 25, 2017 at 10:25 PM, Jon Elson wrote:
> Field weakening is not possible on permanent magnet
> brushless motors.
>
>
It actually is. Apply current in the D axis will oppose and reduce the net
flux in the gap. Move a coil in between two N poles permanent magnets
facing each other and
I have those same PA-09 crimpers. They will crimp the insanely tiny JST-SH
(1.0mm pitch) connector. They work very well.
Stephen
On Sat, Dec 3, 2016 at 8:33 PM, Danny Miller wrote:
> For those micro-pins, I had NO success with any crimper but this one,
> which worked GREAT:
>
> https://www.am
>
> I also tried a cheap chinesse one but it's was a disaster. Then I found
> these Mitutoyo that are extremely cheap and come from China but I don't
> know what to think.
>
> http://www.ebay.com/itm/Mitutoyo-500-196-20-30-300mm-
> 12-Absolute-Digital-Digimatic-Vernier-Caliper-/331999662209?
> hash
We're running 72Mhz dual channel-DDR-QSPI on a little Cortex ARM =
1.152Gbit/s :) (FWIW, more for super low delay than raw data rate)
On Wed, Oct 26, 2016 at 9:12 AM, W. Martinjak wrote:
> On 2016-10-26 08:39, Chris Albertson wrote:
> > Yes they are that fast in some micro controllers. But on
So you found a dropped packet on one particular combination of
hardware/software some time ago. Bugs get fixed (and yes, new ones
sometimes introduced.) LinuxCNC has had bugs. Doesn't mean that a PC/RTOS
has no business running a machine. There are no collisions on full duplex
ethernet as its n
rzemek.klosow...@gmail.com> wrote:
> On Mon, Oct 24, 2016 at 10:42 PM, Stephen Dubovsky
> wrote:
> > Why would UDP need resends on a shared ethernet port? There are no
> > collisions on a full-duplex port & switch (which is pretty much ALL of
> them
> > now-a-days.)
Im fully aware UDP doesn't resend. But there are no collisions on modern
ethernet LANs. No more reason a UDP packet would be corrupted going
through a (shared) switch as a direct connection.
On Tue, Oct 25, 2016 at 8:23 AM, Mark wrote:
> On 10/24/2016 10:42 PM, Stephen Dubovsky wrote:
Why would UDP need resends on a shared ethernet port? There are no
collisions on a full-duplex port & switch (which is pretty much ALL of them
now-a-days.) Passive hubs went the way of the dodo.
On Mon, Oct 24, 2016 at 10:22 PM, Gene Heskett wrote:
> On Monday 24 October 2016 22:05:47 Mark Jo
I think the error of this approach (using N times higher accel/vel) is
coming from the piecewise linear approximations of the curves going bad.
If you try to follow a curve N times faster, then there are N times fewer
samples along that curve for a fixed time sampling period. That introduces
error
In a sim config, can you increase the base thread rate 100x+ w/o it knowing
its been sped up? Disable the RTOS scheduling entirely? It would run all
the same calcs, same HAL, same gains/accel, just no RTOS pauses between
calls. Basically count the # of base thread cycles, multiply what you told
On Tue, Aug 2, 2016 at 10:46 AM, Mark wrote:
> You can't "heat treat" brass/bronze/copper etc (non-ferrous) to harden.
> You can only anneal those metals. They do, however, work harden, which
> annealing takes away.
>
> Mark
>
FWIW, There are copper alloys that can be heat treated. Beryllium c
If you are hollowing out a book, why not glue the pages together first?
Should be able to come up w/ some sort of super thinned out glue to dip the
pages into (while holding the bookends back.) Then clamp in a press to let
dry. Would have to do this w/ the covers closed to get the spine and paper
My L00 MT4.5 Clausing 5C adapter sticks out of the spindle a similar
amount. It's for the thread protector (which also serves to eject the
adapter when you unscrew it.)
On Jul 1, 2016 11:02 PM, "Gene Heskett" wrote:
> Greetings everybody;
>
> This Sheldon lathe came with an MT5 -> 5C adapter, bu
You can not just shift the extents by +2" on a non-cartesian machine - you
have to recheck every point. We tend to forget how complex the general
case can be when we're used to running cartesian mills/routers.
Stephen
On Mon, Jun 27, 2016 at 1:18 PM, andy pugh wrote:
> On 27 June 2016 at 17:16
Depends on how you define suitable. For straight up hard-switched
boost/buck I would agree. Try implementing something like phase-shift
modulation to get 'free' ZVS soft-switching (lower EMI and higher
efficiency) and I will disagree. The microcontroller horsepower typically
isn't lacking but th
You can not include the termination or pull up/down resistors on a
RS422/485 network in the drivers (unless they can by disabled.) You don't
know where (or how many) are located on the bus. They are multi-drop
networks after all. Only terminate the two far ends.
On Fri, Apr 1, 2016 at 1:37 PM,
Rick, would one of those USB flash drives w/ built in wifi work? (Sandisk
makes one, Im sure there are others.) The machine would see the USB flash
drive and you could drop files on it from another machine via the wifi?
SMD
On Thu, Mar 24, 2016 at 2:22 PM, Rick Lair wrote:
> Even though all th
And there are some that do both 1 *AND* 2. Look at the Xilinx Zynq for
example. Dual gigahertz A9 cores w/ a FPGA core (Spartan/Virtex) that IIRC
is larger than the one used for the Mesa 5i25. Could run a zillion
channels of PWM or even hostmot2. We were porting some code to it for a
work proje
+100 to that! :D
*THANK YOU* for the hm2 sserial fix. Endured the 5C garage temps for a
while to update and then further troubleshooting my X axis (must have
flipped a bit or swapped the wiring polarity while I was monkeying w/ the
servos to quiet them down.) The Supermax mill is back up and ru
No mixup. I used to work for GE (and Hughes) designing AC induction drives
for mostly traction applications. You can servo **ANY** induction motor.
The only limit to frequency response is the inductance and that can be
solved with high enough bus voltage (DC motors and steppers have the exact
sam
The positioning ability of an induction motor is no different to that of a
DC servo motor. When no torque is needed both go to zero voltage/current
to stop moving (though technically an induction motor can maintain a DC
current if it chooses to to provide braking - similar to shorting out the
DC m
They do typ top out around 3HP 1ph. So just don't use them;)
What John pointed out is entirely correct. The inverter runs from a
rectified DC bus. There are 2 things limiting you running a 3ph vfd on a
1ph line.
1) Phase loss detection. Some big inverters will fault if they detect one
of the p
The lack of torque multiplication by removing a variator/gearbox can be
partially solved by just using a bigger motor. Its my understanding that
Monarch use a 10hp motor+VFD for 10EE retrofits instead of using a
gearbox. Simple. The original MG set versions used a 3hp?? Though I have
no idea w/
I run my pc and monitor off the 240. Almost all are universal input
nowadays (some pcs require a switch) and have isolated supplies.
On Dec 25, 2015 12:18 PM, "Ed" wrote:
> On my CHNC I have a 500VA control transformer to drop 240V to 120V for
> the computer and the monitor. That way I do not hav
Peter, this is the root cause in the change of behavior between <=2.6 and
2.7 w/ the 5i25+7i77 that a couple of us have been having (was discussed
here about a week ago)? I have noticed an occasional warning in the prior
version I was running (just at startup iirc.) I need to put some more
noise
FWIW, the iCoupler type things from ADI and Silicon Devices are faster,
cheaper, better isolation, and lower powered than high speed optos. win,
win, win, win;)
On Mon, Dec 14, 2015 at 7:11 PM, Jerry Scharf wrote:
> Hi,
>
> Just did a super quick google search and came up with a fairchild
> opt
How to set dec? And what was it in prior versions?
On Tue, Dec 8, 2015 at 7:49 PM, andy pugh wrote:
> On 8 December 2015 at 23:25, Peter C. Wallace wrote:
> > Possible software fixes are having the driver ignore this error (as
> apparently
> > 2.6 does)
>
> There are parameters for smartserial
Opps. Yes I meant an involute hob is a simple trapezoid. No curves;)
Cycloidal hob is indeed a funnier shaped thing and far more difficult to
make.
On Tue, Dec 8, 2015 at 5:14 PM, Dave Caroline
wrote:
> Hobs can be ground to generate cycloidal teeth as well as involute,
> the key word here is
I can generate mine tonight but it looks exactly the same.
On Tue, Dec 8, 2015 at 3:26 PM, Todd Zuercher
wrote:
> Here it is.
>
> - Original Message -
> From: "Peter C. Wallace"
> To: "Enhanced Machine Controller (EMC)"
> Sent: Tuesday, December 8, 2015 3:19:10 PM
> Subject: Re: [Emc-u
If you use a divider head its not hobbing. Hobs do not have epicycloidal
teeth. They are trapezoidal iirc. The curved tooth comes from rotating
both the hob AND the blank together to get multiple angles of attack on the
cut.
On Tue, Dec 8, 2015 at 2:52 PM, Peter Blodow wrote:
> Andy, yes, I'v
uot;error = (13) Communication error"
Looks like something is still mismatched?
FWIW, it looks like the 5i25 is ver 1.43. Newer than it was, though not
sure if that is the latest.
Thank you,
Stephen
On Mon, Dec 7, 2015 at 12:06 AM, Stephen Dubovsky
wrote:
> Thank you! Will try it tomor
I *THINK* if you incline your resolver gear you can use a straight cut
gear. IIRC, the sum of helix angles must add up to the shaft angles. In
your picture the shaft angles are 90deg so one helix is something like
80deg (the large gear) and the other is 10deg (the small gear). You can do
the sam
ADME file in sserial/utils/linuxcnc.
>
> So, you will need ssinstall script and a special script, called update7i77
>
> 12/07/2015 06:03 AM, Stephen Dubovsky rašė:
> > Hello all,
> > Upgraded the Ubuntu mill (2.5?) to 2.7.3. Using a 5i25 & 7i77. It
> > complained t
Hello all,
Upgraded the Ubuntu mill (2.5?) to 2.7.3. Using a 5i25 & 7i77. It
complained that the 7i77 needed updating. I found some docs on the forum
and updated the 5i25. But it still complains "hm2/hm2_5i25.0: Warning:
sserial remote device 7i77 channel 0 has old firmware that should be
updat
I have a couple Compact5s and its definitely a brushed dc spindle motor.
Using a KBC DC speed controller on one of them but I can't reverse it w/o
adding some sort of DPDT relay and some time delays. It uses AC input so
pretty easy to use.
I've thought about adding spindle reversing for rigid tap
There is a limit to db suppression for rifles. I can double up muffs over
plugs when shooting a 50bmg but its really isn't THAT much quieter. Bone
conduction limits the max suppression possible.
I have a set of 3M(?) muffs that are super quiet but would be useless
firing a rifle as they protrude
You may need to have it retracted to clear another tool in an adjacent
pocket in the turret. What if you put a large diameter tool, like a face
mill, beside another?
On Tue, Nov 10, 2015 at 4:54 PM, Dave Cole wrote:
> If you rotate it with it extended it will have a lot more inertia, tend
> to
Trickier than that. Depending on the corner point it may be able to
develop the same hp at half speed w/ twice the torque. One would think
that an induction motor that needed variable speed would be designed to top
out somewhere on the const hp part of the curve than right on the corner
point. I
The GS2 is a simple V/Hz control which is open loop. 208V @ 60Hz = 1800rpm
simply scales 1/18 to 11.5V @ 3.3Hz = 100rpm. Nonlinearities will often
cause problems at very low speeds in an open loop system. (Note: the GS2
might have some functions to boost the voltage at low speeds and such to
help
You can't run a belt fast *IN* a fluid. You can run it in an oily
environment like the outside of a car engine. But to run one submerged it
will 'hydroplane'. The fluid that fills the gear tooth void must be pumped
out when the belt tooth enters it. The fluid in a belt has nowhere to go
but out
On Thu, Jul 16, 2015 at 6:39 AM, Erik Christiansen
wrote:
>
> Yebbut, what on earth do we use when flashplayer won't cut it any more?
>
>
HTML5 replaces Flash for the most part.
--
Don't Limit Your Business. Reach for the
There are air operated collet drawbars for grinders. My KOLee came w/ a
pair of them.
SMD
On Fri, Jul 10, 2015 at 2:58 PM, Dave Cole wrote:
> I think that most CNC power 3 jaw chucks are hydraulic.
> You might be able to find one used and setup an air over hydraulic
> cylinder to control it so
If you look at something like Vectric's V-carve Pro it does the faster
no-lift case. I suspect the high-end Aspire tool does the same since they
are based on the same code base. For something like an A they don't even
lift to go back a little to get to the cross bar. And its geared towards
wood
As has been stated, Ethernet has lots of advantages. We use it for a real
time control network (loop control > 1kHz.) We just use an unused
ethertype. All other stuff on the network will thus ignore the data and we
don't need to have an IP stack (we do since we also run web traffic, but
our cont
d.
On Fri, May 15, 2015 at 11:33 AM, Jon Elson wrote:
> On 05/15/2015 09:34 AM, Stephen Dubovsky wrote:
> > A brushed AC motor in a drill/router/saw is almost assuredly a
> 'universal'
> > motor. Its a DC parallel field wound motor.
> I re
A brushed AC motor in a drill/router/saw is almost assuredly a 'universal'
motor. Its a DC parallel field wound motor. Thus both the rotor and
stator are connected to the same terminals. When the AC polarity reverses
BOTH magnetic fields reverse and the motor still turns the same direction
(both
No collisions on full duplex ethernet (which is practically ALL 100bT and
faster networks.) You can sit behind another packet from a switch going to
the same destination. VLAN/priority tagging can be used to bump real time
up to highest priority (jump to the head of the queue put simply.) Takes
It *IS* AC. 10-30kHz AC. And 40A isn't going to cut it. I think
Leonardo is mentioning 97A/phase MAINS input. Compute the input power
draw. Is typ goes through a high freq stepdown transformer so its only a
couple volts AC and hundreds (thousands?) of amps. Takes many many kJ of
energy to ma
EMI. VFDs generate lots of it. You're likely getting lots of noise coupled
into your limit switch cabling. Shield the vfd wires if possible. Running in a
shielded single cable is probably best. Separate the motor and switch cables as
much as possible too.
On March 6, 2015 6:56:08 AM EST, rus
Gregg,
You in the continental US? I could probably ship you one of mine for about
that;) I bought three in one lot from a school auction. Converted one to
LCNC for myself, sold another to a friend who is also doing the same, and
still have the third. Mine are yellow though.
On Thu, Jan 29, 20
Slice the buttons off some donors. We have elastomeric keypads made for us
(offshore) and AFAIK, they drop the carbon buttons in the molds and inject
the elastomer. They can be cut off w/ an exacto knife. I don't have any
raw buttons but I could send you some keypads that have 4 per. Though is
Yes, IME they will cut a V-ish shaped groove where none existed before.
Common in sign carving. Mine are woodworking bits so they wont
plunge/centercut well and would have to be ramped in like if using a face
mill to pocket. Dont know if the little ones for metalworking are center
cutting or not.
Eh? Google has owned YouTube for what has to be a decade by now.
On Thu, Oct 30, 2014 at 10:39 AM, Pete Matos wrote:
> Yeah I am pretty well against anything Google plus. tried it and it wanted
> to turn my YouTube account against me and a host of other annoyances. I
> turned it off which tha
Found it: "the engines that came in from the cold"
https://www.youtube.com/playlist?list=PLv7-kDhSnm7P1dAiJvvjeiLgwfv8_58TO
On Wed, Oct 29, 2014 at 8:15 PM, Stephen Dubovsky
wrote:
> Yes, the old russian rockets are BETTER than anything the US produced,
> even today. They
Yes, the old russian rockets are BETTER than anything the US produced, even
today. They are closed cycle. There was a very good documentary on them
not too long ago I watched but can't find it now.
On Wed, Oct 29, 2014 at 8:07 PM, Home wrote:
> As I understand it, those are (basically) the sam
Looks really nice Kirk. I have a manual lathe that I have scales for but
haven't bought a display device yet.
On Wed, Oct 22, 2014 at 2:54 PM, John Alexander Stewart
wrote:
> Kirk;
>
> Interesting - I did just sell my drill press, and am finishing up a "G0704"
> mill conversion, and would like
Could you use a tag cable? (there are other sources of the same thing.) We
use them for programming.
http://www.tag-connect.com/
Samtec makes header sockets that can come up through the bottom of the
board. We use those too.
SMD
On Wed, Oct 15, 2014 at 3:50 PM, Kirk Wallace
wrote:
> I'm plan
LOL. Just noticed the scale of the thing. Only 1/8" tall ramps? File it
by hand. Only you know what it mates to and its exact function. How
precise does it need to be?
SMD
On Mon, Oct 13, 2014 at 11:33 AM, andy pugh wrote:
> On 13 October 2014 16:18, Dave Caroline
> wrote:
> > I think you
Dont overthink it;)
1) Mount it flat and cut four slots. It appears thats what they did. To
make them undercut as your last email states, incline on a rotary table
slightly (or tilt the head.)
2) Mount on an A-axis and machine the ramps from the side.
You will have a very small step at the botto
> That usage does NOT require a goto, a conventional if statement works:
>
He was simply pointing out the syntax. Of course a two line statement
didn't need a goto.
> There are plenty of ways to use goto that are clean and structured. And
> every one of those ways is better done using if/else/
All Kurt vises are keyed on the bottom. They even sell the keys in
different stepped widths IIRC. My import vises are also keyed the same
(but included the keys and have to be ground down if you have something
other than a bridgeport sized slot.) So maybe the guy wasn't so clever;)
They do repea
Rotary transformers may be a better idea than slip rings. AC couple
everything. Resolvers, being AC in nature, work very well through them.
On Fri, Jul 18, 2014 at 12:46 PM, andy pugh wrote:
> On 18 July 2014 17:39, jeremy youngs wrote:
> > how about a blue tooth transmitter? our mazak probe
On Thu, Jun 12, 2014 at 5:09 PM, rayj wrote:
> ...
> Assuming identical motors and driver boards, is it possible to wire both
> driver boards to the same output from the breakout board. Example: run
> the wires from the BOB X-axis step pin to the step input for 2 drivers
> and the X-axis directi
Cut down an allen wrench. I have a whole collection of them w/ ~1/4" stubs
on the end. Or I cut off a short pc w/ a cutoff wheel and tack weld it to
a flat bar. Or cut off a short pc, drop it in the screw w/ pliers/tweezers
and use an open end wrench on the visible stub. You can make REALLY low
What spindle is that?
On Thu, Apr 3, 2014 at 10:44 PM, Rod Fitzsimmons Frey wrote:
> Thanks for all the help everyone gave me getting my rack toolchanger going.
> It's working well.
>
> https://www.youtube.com/watch?v=0mwmas6hFRQ
>
> -
Andy,
You talking about doing it this way?
http://buildbot.linuxcnc.org/
(BTW, I found that by googling "how to get linuxcnc master branch")
Agreed. Doing git and compiling falls under "linux guru". But even I can
follow the above instructions.
On Thu, Apr 3, 2014 at 4:01 PM, andy pugh wrote:
> It would be pretty awesome to read the DRO data from LinuxCNC... :)
That would be pretty trivial w/ mesa boards (or any other hardware w/
encoder inputs.)
SMD
--
Flow-based real-time traffic analytics software. Cisco cer
Video clearly shows 2 different computers.
On Tue, Feb 25, 2014 at 11:00 AM, John Kasunich wrote:
> I think (and Sam can probably confirm) that he was using
> two separate computers in both cases.
>
> On Tue, Feb 25, 2014, at 10:45 AM, Steve Stallings wrote:
> > Also wonder if there is any conce
Thats brilliant! Very interesting info Sam!
Stephen
On Mon, Feb 24, 2014 at 2:19 PM, sam sokolik wrote:
> I have been testing a few things - 7i80, Robs new TP. I thought I would
> combine the two. After finding out that the mesa encoder counters will
> count step/dir (awesome work Peter!) -
Are steps also being generated (back and forth) or is just the direction
line toggling (w/ no steps)?
On Sat, Feb 22, 2014 at 10:56 AM, Mark Tucker wrote:
> I seem to remember there being a fix for this around v2.3 or something
> to stop the stepper motors hunting.which i assume must have been
> 3) I am really surprised that this works at all without blowing the
> drivers. You cannot guarantee that both motors are identical.
>
>
You can feed two same identical step/dir inputs to multiple drivers. That
is how my commercial accucut (48" sq) gantry did it. In theory, you could
run an infi
On Thu, Jan 30, 2014 at 2:24 PM, Jim Wilkin wrote:
> Thank you Sebastion,
>
> This is for my new to me EMCO compact 5 cnc lathe retrofit.
>
>
Hey! Im currently doing three of these! I have one machine up and running
w/ Mesa boards, new steppers+drivers, D525MW, and an ELO touchscreen. Only
thi
We're using Mesa 5i25+7i76s in a couple Emco stepper based machines w/
2.5mm pitch leadscrews. PNCConf seems to be truncating that 2.5 back to
2.0 every time we revisit the step calculator page (the pop-up where you
check off/enter the pulley info, step multiplier, etc.) that calculates the
main s
ocity
mode setting. As long as the filter rate is reasonable I guess the output
isn't still settling for a good time after the wheel has stopped.
Thanks again,
Stephen
On Tue, Jan 28, 2014 at 6:01 AM, andy pugh wrote:
> On 28 January 2014 02:09, Stephen Dubovsky wrote:
>
> >
We have MPG 'banging' on two machines that are tuned fast and I just found
the 'ilowpass' example fix online:
http://linuxcnc.org/docs/html/examples/mpg.html
Looks to be a FIR filter. I had actually found the 'limit2' and 'limit3'
functions first to use as rate limiters when searching. There is
Tex & Steve (PMDX) have done a couple ball screw micromills. I go to the
monthly meetings and have seen them;) I think Tex has to machine the nut a
little to fit but they appear to work great. Might want to drop Steve a
line again and see what they're doing if he doesn't pipe in here first.
On
On Tue, Dec 10, 2013 at 1:50 PM, Dave Cole wrote:
> I've got an Erickson QC30 on my Bridgeport CNC mill.
> R8 does not maintain any accurate Z reference after a tool change.
>
Why? R8 uses a taper angle of 16.85deg. NMTB/QC30 uses 16.5943deg [both
from wikipedia]. Both of them the taper face
Im not sure I'd go that far (and Im an owner of both). NMTB/QC30 has
positive drive but a R8 power drawbar absolutely whoops QC30 in tool change
speed & ease. Push button vs having to yank on a wrench both in and out.
Its not really an improvement.
SMD
On Tue, Dec 10, 2013 at 12:10 PM, Dave Co
On Thu, Nov 14, 2013 at 3:10 PM, Maximiliano Fermín Córdoba <
m.f.cordoba...@gmail.com> wrote:
> If the jitter is
> like the one Im facing now its useless.
>
>
Why? Both the mechanical inertia of the motor and the pwm frequency might
be well below your step rate. Odds are REALLY high the steppe
Just got an email from Zoro tools. 30% off *3 HOURS ONLY* today @ 11-2pm
CST. Coupon "30NOW"
On Tue, Nov 5, 2013 at 11:07 AM, Dave Cole wrote:
> I ordered some stuff from them yesterday late afternoon and I got a note
> that it was shipped at 7am this morning. So not bad.
> Free shipping ov
Hmm. I didn't know Zoro was owned by Grainger. Good to know! FWIW, they
run a 25% off sale a couple times a year (up to $2000 IIRC.) I have bought
a PILE of stuff from them on several occasions when they run those sales.
IIRC, 5gal pails of Vactra/Velocite delivered for about 1/2 the price of
a
W/ problem like these it seems simpler to me to create a custom
configuration for the machine than to generate 'proper' g-code. Just
generate the text/engraving in the XY plane (which is typ easy to do w/
lots of programs) and create a custom HAL file that drives the A axis motor
from Y's commands
a mil dot on a gun sight is one milliradian. It works out to 1m offset at
1000m (or 1yd @ 1000yd if so inclined but metric is easier.)
On Thu, Oct 31, 2013 at 1:52 PM, andy pugh wrote:
> On 31 October 2013 17:18, Marius Liebenberg
> wrote:
> > I always understood a mil to be a measure specifi
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 wrote:
> That could work as well.
>
> I thought this was part of your safety
Run physical signal to two pins? Encoder & gpio. Encoder wont care about
extra twiddling at start (and you're going to reset its counter anyway).
Gpio (uart) doesn't care if you ignore its output later.
SMD
On Tue, Sep 10, 2013 at 1:50 PM, Rudy du Preez wrote:
> I now realize that the A phas
On Tue, Aug 6, 2013 at 9:41 AM, dave wrote:
> Too early in the morning and still on first cup of coffee but: if you are
> within the 1/4
> step (null) then increased feedback of some kind won't fix it.
>
It does fix it. The feedback will cause the control loop to shift the
commanded position aw
Something to remember w/ steppers is that they produce no torque at rest.
The maximum pullout torque is at 1/4 full step of error. W/ a typ 200 step
motor thats 1/800th of a revolution. W/ a 0.2"(5tpi) leadscrew like on a
bridgeport that is 0.2/800= +-.00025" error depending on moving/cutting
for
Cecil,
Very nice! Can you provide details & pics of your "nut catcher"? I've
thought of doing something along those lines to one of my lathes and would
love to see how someone else implemented it!
Thank you,
Stephen
On Mon, Aug 5, 2013 at 1:56 PM, Cecil Thomas wrote:
> I made a "nut-catcher"
Might have brought out both leads of each winding so it can be wired wye or
delta.
On Mon, Jul 29, 2013 at 6:12 PM, Curtis Dutton wrote:
> OOps I forgot to name all of the wires.
>
> A+ - Motor winding phase A+
> A-
> B+
> B-
> C+
> C-
>
> REA - Resolver phase A excitation signal
> REB - Resolv
Sam,
I also have three of these from a school (compact 5 cnc versions). One has
the tool turret.
I couldn't do the web documented stepper mod because my boards were of a
different revision. So I bought some chinese stepper drivers and just
converted one (longs_motor 4.2A DM542A). The orig stepp
On Sun, Jul 7, 2013 at 4:08 PM, Charles Steinkuehler <
char...@steinkuehler.net> wrote:
> Did I miss the manual section on setting up probing?
>
G38 is probing.
http://linuxcnc.org/docs/html/gcode/gcode.html#sec:G38-probe
--
On Thu, Jun 27, 2013 at 3:33 PM, Dave wrote:
> >>Analog PID works at a (near) infinite
> rate.
>
> Yeah... when was the last time anyone worked on one of those.
>
All the time. The VAST majority of switching power supplies out there are
analog loops. Wall warts, all your computer power supplie
On Thu, Jun 27, 2013 at 11:13 AM, Dave wrote:
> Your PID loop is likely running a lot faster than what is required.
Agreed.
> The PID loop should run 10x to 50x the time constant of the control
> system. Any faster and you will end up with very small changes in tuning
> values that make a hu
1 - 100 of 185 matches
Mail list logo
