p
corrected the fairly small steady-state errors due to things like the lead
screw heating up (10 foot long screw, it adds up). It also compensates for
backlash in the screw, and if there is much of that it leads to disturbances on
direction reversal. Isn't going to fix a clapped out machi
ses thru a bead can increase effectiveness (somewhere between N and
N squared), but only if they all pass thru the bead in the same direction.
--
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jmkasun...@fastmail.fm
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s become more severe. At
rectified 120V line (170V DC) it matters. At rectified 230V (330V DC) it
matters more. And at rectified 480V or 690V (my day job), it becomes huge.
--
John Kasunich
jmkasun...@fastmail.fm
---
n that even
the el-cheapo 4' shop lights are made of metal.
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> > ___
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> > https://lists.sourceforge.net/lists/listinfo/emc-users
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> --
On Wed, Apr 11, 2018, at 3:08 PM, John Kasunich wrote:
>
>
> On Wed, Apr 11, 2018, at 10:30 AM, David Berndt wrote:
> > I'm looking to output about 1000lbf in a linear direction via a
> > crank/slider or ballscrew
> You don't mention the stroke length. Are
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Check out the vibra
u have 127V at your house, you are actually a hair above the +5%
tolerance. Maybe your local power company has set the transformer taps a bit
high to allow for voltage drop at the far end of the line, and you are stuck
with it because you are near the transformer...
--
John Kas
u kill yourself or someone else.
> Between box and real ground tester read 30 v ac
Maybe that means your wiring error is on the secondary side of your power
supply transformer.
--
John Kasunich
jmkasun...@fastmail.fm
--
or pulley. That means you can spin it up by simply plugging in the
motor.
I'd try to turn the stuff out of the grooves using a "lathe tool" made of
something softer than the pulley.
Hand-held, probably with an improvised tool rest, like on a wood lathe
--
You can use up to 16 pairs. Best approach is to plot your measured errors
on a piece of paper or in a spreadsheet, then find the set of 16 (or fewer)
straight line segments that best matches your measured error plot.
--
base is absolutely not at risk.
The LinuxCNC code was moved off of Sourceforge years ago. It was on a
privately hosted git server for a while, but was moved to github several months
ago.
The LinuxCNC website is also NOT on Sourceforge. I'm not exactly sure where it
is hosted now, but it hasn't
--
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the email address
you entered was subscribed, it has now been unsubscribed". So even now I don't
know if it worked. Let us know if you continue to get messages (and make sure
to give the exact message that the list is s
Go to https://lists.sourceforge.net/lists/listinfo/emc-users and unsubscribe
yourself.
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t on the
spindle axis, and that means the part is being rocked back and forth in the
chuck once per revolution.
--
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ear would
be two stacked and coupled gears, one with M teeth (meshing with
the N tooth planets) and one with M-2 teeth (meshing with the N+1
planets).
Not sure if what I'm describing is still a wolfrom drive, but it would
have the same result - a very high reduction from planet to output
ring.
--
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> --
> Check out the vibrant tech community on one of the world's most
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0
halcmd show param hm2_5i25.0.pwmgen.00.out0.invert_output
(it should be false now)
If the above doesn't work, either the driver is writing to the parameter,
or something is seriously busted in your install of LinuxCNC.
--
John Kasunich
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-
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On Thu, Nov 16, 2017, at 12:39 PM, John Kasunich wrote:
>
>
> On Thu, Nov 16, 2017, at 11:58 AM, Gene Heskett wrote:
> > On Wednesday 15 November 2017 23:38:46 Jon Elson wrote:
> >
> > > It seems that Tech Shop has gone out of business nationally.
> > &g
sell?
>
I think they didn't sell things. They are/were a shop space where people would
pay a membership fee for access to space, tools, etc. Makerspace kind of thing.
--
John Kasunich
jmkasun...@fastmail.fm
quadrature cycle and
thus deviations from proper 90 degree quadrature phasing are
masked.
John Kasunich
jmkasun...@fastmail.fm
--
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e g-code
a couple times (in some cases I don't even bother with a program
except for the roughing, I make the first and final cuts with MDI).
But for a one-off like Gene is describing, I've found this process
to be the best way to get the diameter I'm aiming for.
--
John Kasunich
jmkasun...
Maybe but it definitely will remove a thin layer of the diamond. and
another, and another
On Thu, Aug 3, 2017, at 11:55 AM, Stuart Stevenson wrote:
> Would that create a thin layer of casehardening?
>
> On Thu, Aug 3, 2017 at 10:02 AM, John Kasunich <jmkasun...@fastmail
; Emc-users mailing list
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Ch
cmaster.com/mvA/contents/gfx/large/2529a21p1-a02cl.png
That little notch at the tip of the spiral point tap makes a huge difference!
--
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jmkasun...@fastmail.fm
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n_ want to touch off the
last axis I moved, but not _always_
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tick it back in the chuck and just take enough of a
skim cut to make sure it is centered again.
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Check out the vibrant tech community on one of the world's most
engaging tech sites,
nd the cheap one
actually has a few features that are nicer then my (older) Fluke.
But for anything higher than 120V, I only use the Fluke.
--
John Kasunich
jmkasun...@fastmail.fm
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t
> https://lists.sourceforge.net/lists/listinfo/emc-users
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need? If 16 or less, check out the lincurve component
http://linuxcnc.org/docs/html/man/man9/lincurve.9.html
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jmkasun...@fastmail.fm
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---
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mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
> --
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On Fri, Apr 14, 2017, at 11:37 AM, John Kasunich wrote:
>
>
> On Thu, Apr 13, 2017, at 08:59 PM, Jon Elson wrote:
> > On 04/13/2017 12:44 PM, Todd Zuercher wrote:
> > >
> > > But I'm cutting out a 2ft x 3ft window. It would be silly to pocket fill
l about.
https://www.youtube.com/watch?v=Pkgw-w_AoOo
--
John Kasunich
jmkasun...@fastmail.fm
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ted by
faster threads. Thread priority in HAL is automatically set up with
the fastest threads having the highest priority so they can interrupt
slower threads.
--
John Kasunich
jmkasun...@fastmail.fm
--
Check out the
dy, I don't trust Autodesk
for a second. My hobby projects move slowly - I need tools that are viable over
a timescale of a decade or more, (or data format that let me extract my work
and move to another tool). I just don't see that in t
tech community on one of the world's most
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Elaborating on my own post:
On Thu, Mar 30, 2017, at 03:21 PM, John Kasunich wrote:
> Why can't it be as 120mm diameter x 5mm thick disk?
Turn said disk on the lathe, and bore a concentric but much smaller hole in the
center. Then you can indicate to either the hole or a dowel inser
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&
tt
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
> -
y on one of the world's most
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workspaces with light workpieces and fewer degrees of freedom can be 1/10
or even 1/100 the price of large workspaces with heavy workpieces and many
degrees of freedom.
--
John Kasunich
jmkasun...@fastmail.fm
--
Che
10", set jog-scale to 0.0025".
And so on...
hm2_[HOSTMOT2](BOARD).0.encoder.01.scale has nothing to do with it.
That is used INSIDE the encoder driver to scale the floating point output of
the encoder.
Wheel jogging doesn't use the floating point output of the encoder, it uses the
raw coun
d be two flats on the
body.
The intent is that you use two wrenches, on one the body flats and one on the
collet nut.
--
John Kasunich
jmkasun...@fastmail.fm
--
Announcing the Oxford Dictionaries API! The API offers
for me to make, so surely it would have been for Fanuc too?
>
> What am I missing?
>
Smoothness of movement is 4x better with the finer resolution.
--
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jmkasun...@fastmail.fm
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sers mailing list
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On Tue, Dec 13, 2016, at 11:08 AM, Gene Heskett wrote:
> On Tuesday 13 December 2016 09:27:22 John Kasunich wrote:
> That doesn't sound nearly so usefull John, except as a way to fix a
> screwup in an existing config. By what you say, I can't even do a
> addf mux2 1
> as
al values for "position" are -6 thru 6. Positive
6 means 6th in the thread, so it counts off five from the front of the
list and inserts the new one after #5. If you tried positive 7 it would
need to count off 6 from the front of the list. There are only 5, so the
counting would hit the en
On Mon, Oct 31, 2016, at 02:42 PM, John Kasunich wrote:
>
> This picture is under 50K, hopefully nobody minds.
LOL, apparently the list software minds, and stripped it out.
http://www.shars.com/media/catalog/product/cache/1/image/540x/17f82f742ffe127f42dca9de82fb58b1/3/0/303-134
On Mon, Oct 31, 2016, at 02:37 PM, John Kasunich wrote:
>
>
> On Mon, Oct 31, 2016, at 01:15 PM, Gene Heskett wrote:
> > On Monday 31 October 2016 10:44:33 John Kasunich wrote:
>
> > > That's why I don't own a digital caliper. Mine all have dials
> > >
>
On Mon, Oct 31, 2016, at 01:15 PM, Gene Heskett wrote:
> On Monday 31 October 2016 10:44:33 John Kasunich wrote:
> > That's why I don't own a digital caliper. Mine all have dials
> >
> > I even have a couple (one at work, one at home) 6" dual-needle dial
> &
a dead battery in 17 years.
I even have a couple (one at work, one at home) 6" dual-needle dial
calipers that read in metric and inches.
--
John Kasunich
jmkasun...@fastmail.fm
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figured out how to build LinuxCNC for
beaglebone, so I came back to my roots and am happy.
--
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was about 2 feet
(0.6m) in diameter, and the four steel tie-rods that held the machine together
against the clamp force were about 100mm diameter.
Could you make it out of four strips with some kind of joining at the corners?
John Kasunich
On Sat, Oct 15, 2016, at 08:12 PM, Leonardo Marsaglia
f using more power off of your power supply.
This seems like the most reasonable solution yet, other than the simple bypass
around the nut.
The rest seems like killing ants with sledgehammers.
--
John Kasunich
jmkasun...
On Thu, Sep 29, 2016, at 11:15 AM, John Kasunich wrote:
>
>
> On Thu, Sep 29, 2016, at 10:48 AM, Florian Rist wrote:
> > Could I do something with the axis jog pins:
> >
> > axis.0.jog-vel-mode
> > axis.0.jog-enable
> > axis.0.jog-scale
>
>
ly controlling each
> > motor (for "homing") to coordinated control.
>
> Oh, sounds very interesting.
As long as you are using LinuxCNC's motion controlle
ss the other one all move done in sync.
>
> Whats the best way to do this. The three axis are moved by servo motors
> via a Mesa card and Mesa amplifiers.
>
> I have plenty of unused IOs on the Mesa c
buying some cutting tools from a limey vendor a year ago, I'll
> be 6 weeks getting it into my hands. Nyet.
Andy posts UK based suppliers because he is in the UK. The point is
that the stuff is out there, and there is probably a US seller if you
use the right search terms.
--
John
@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
--
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jmkasun...@fastmail.fm
--
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at
n kind enough to open-source all the vhdl for their cards.
>
> Mesa has made a tremendous contribution to the community with their
> hardware and firmware.
>
Indeed. And for that reason alone I would buy the Mesa FPGA cards, even if
someone else was cheaper.
--
John
e into the side of a vise while jogging
The normal behavior is to protect sensitive and expensive equipment.
If you don't like that, you can modify it using HAL logic quite easily.
--
John Ka
goes thru another contactor
that has a charge-pump based HARDWARE estop. That
main power contactor doesn't pull in until LinuxCNC is
started and I bring it out of estop. And the main powe
Just buy the insurance...
Only 1.6 million anyway (I saw 512GB microSD advertised for $60 each)
Actually, ought to be less than that - you should be able to negotiate a
quantity discount.
On Fri, Sep 2, 2016, at 02:24 PM, Andy Pugh wrote:
>
>
> > On 2 Sep 2016, at 21:14, J
On Fri, Sep 2, 2016, at 01:32 PM, Dave Cole wrote:
> Yet it is hardly a blip on an $8 - 32 gig stick drive. The old
> days of 360K floppies and those newfangled hi-capacity 720 K and 1.44
> meg floppies seem so long ago You could stick a 1.44 meg floppy
> in your pocket! That
On Fri, Sep 2, 2016, at 01:34 PM, Ken Strauss wrote:
> Is that using paper or Mylar tape? Did you account for the weight reduction
> due to chad removed?
Paper, and no :-)
John Kasunich
jmkasun...@fastm
!? :-o
>
> The bits on paper tape are about .1" in diameter. That's a lot of paper
> tape.
15.8 miles of paper actually.
The spool would be over 35 inches in diameter and weigh 115 lbs.
gt; Todd Zuercher
> mailto:zuerc...@embarqmail.com
>
>
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less common on this side of the pond.
I did some searching on that topic a few years back and had
zero luck.
John Kasunich
jmkasun...@fastmail.fm
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On Thu, Aug 11, 2016, at 03:11 PM, andy pugh wrote:
> A chap I know made this one out of standard parts, which looks nice
>
> https://goo.gl/photos/NUgVGG3AeYKP23WU8
>
Unnaturally clean in there
--
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weeks
writing code.
John Kasunich
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40 deg C burn-in oven
for testing small VFDs. Over a weekend, the solid-state relay
used to control the heating element failed shorted. On Monday
we found 6 drives whose plastic covers looked like something
out of a Salvador Dali painting.
--
John Kasunich
j
s, Gene Heskett
>
> Perhaps I'm not understanding your earlier questions then about heat
> treating?
>
>
> Mark
I think Gene is questioning the suppliers who list brass as "not heat
treatable".
He's right - annealing is a treatment that involves heat, so yes, brass c
tp") and goes low when the encoder
driver detects an index pulse.
--
John Kasunich
jmkasun...@fastmail.fm
--
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interfac
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are
> consuming the most bandwidth. Provides multi-vendor
digging.
>
> Everything I have been finding in my searches requires a USB interface - if
> nothing else to supply power. Any ideas?
Get one that uses USB only for power, cut the end off a USB cable and splice it
to a 5V wall wart?
--
John Kasunich
jmkasun...@fastmail.fm
I don't think there is really a standard. I would guess most would be
either 45 degrees or 30 degrees.
Stick an un-ground tool blank in the hole and measure it?
John
On Sun, Jul 3, 2016, at 12:05 PM, Gene Heskett wrote:
> Greetings everybody;
>
> This Sheldon lathe came with a boring bar,
ct the R8-ER40 adaptor is too.
R8 to anything adapter is highly unlikely to be bored thru. R8 uses
a 7/16-20 drawbar thread, and a solid drawBAR not a hollow drawTUBE.
--
John Kasunich
jmkasun...@fastmail.fm
--
A
and how it is
connected to the drive, and we know exactly what the HAL pins going
into the driver are doing, maybe we can figure out what is wrong.
--
John Kasunich
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--
Attend Shape: An AT Tech Expo
s smaller than
you expect, often smaller than the clamping diameter of the matching
collets.
In my case I've got ER20 collets and bought some 3/4" straight shank
collet chucks. ER20 collets will hold up to 13mm (1/2"), but the thru-hole
in the shank is more like 3/8" (9mm).
How bi
n his hate
> campaign and may even elect him... Keep writing!
Not on the LINUXCNC mailing list!
--
John Kasunich
jmkasun...@fastmail.fm
--
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
g. We're going to have enough (far too much) of that
elsewhere for the next several months, lets not have it here.
I'm not trying to single Gene out here. Once these things start
they inevitably go downhill, and this one started several messages
ago.
Let's just not start.
--
John Kasunich
On Thu, Jun 2, 2016, at 03:16 PM, Gene Heskett wrote:
> On Thursday 02 June 2016 09:15:35 John Kasunich wrote:
> > It sounds like part of the problem is a spindle pulley that
> > is too small. That hurts twice. First, it reduces the lever
> > arm and requires mor
to uprate the drivetrain to match.
I've seen toothed belts used to transmit 100HP (big belts on big pulleys).
Certainly belts can do the job if sized properly. Industrial sized lathes
(including yours I think) usually use a combination of belts and gears.
Chains are very rare in lathe drivetrains.
-
On Thu, Jun 2, 2016, at 09:45 AM, andy pugh wrote:
> On 2 June 2016 at 14:15, John Kasunich <jmkasun...@fastmail.fm> wrote:
> > Unless this is a mighty slow lathe, I don't think chain is the
> > appropriate drive mechanism.
>
> Silent chain has been used on a nu
to be reliable.
Another option instead of timing belts is multi-groove
V-belts (J series). They have the advantage that you can
make your own pulleys (if you have a working lathe).
A spindle drive shouldn't need positive registration, so
you don't really need toothed belts.
--
John Kasu
be better for dislodging the dust, but most people
don't want to blow MDF dust all over their shops.
--
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Mobile security can be enabling, not merely restricting. Employees who
bring
ot encouraged. It is better to post
pictures somewhere else and link to them in your message.
We don't want the list to be used to distribute spam or viruses
Mark's email supplier is just another reason to not use attachment
en I realized the ground clamp was not on the cutting
> table.
One question: Why do you have a ground "clamp".
A CNC plasma is a more-or-less permanent installation. Put a lug on that
ground cable and bolt it to the machine table/frame.
-
ad (no
arcing or fire). On large (expensive) drives we sometimes use an
auxiliary contact on the bypass contactor as an interlock.
--
John Kasunich
jmkasun...@fastmail.fm
--
Find and fix application perf
hem in my well-stocked junk box so
I used them. The contactors and relays also came from junk.
I think the only thing I bought was the disconnect switch (from
Automation Direct).
This particular supply is a bit unique in that I designed it to work
as a voltage doubler on 120V, or as a bridge rect
power levels, only the bypass device needs to be
a contactor. The charging device can be a simple two-pole
relay, like the ubiquitous ice-cube or KUP.
--
John Kasunich
jmkasun...@fastmail.fm
dc-supply-precharge.pdf
Description: Adobe PDF document
dc-supply-thr
d to observe velocity.
--
John Kasunich
jmkasun...@fastmail.fm
--
Transform Data into Opportunity.
Accelerate data analysis in your applications with
Intel Data Analytics Acceleration Library.
Clic
e same current as the load carrying wires. Putting
the ground in another conduit adds inductance (due to the
loop area formed, and aggravated if the conduit is steel).
That inductance increases voltage drop and makes the
ground less effective in the event of a short to ground at
the load.
--
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