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Chris,
Could you post the link to the Ebay listing where you bought the ball screw?
I have a couple of applications that might benefit from them.
Also, what is the diameter of the nut?
Cecil
At 01:47 PM 2/26/2018, Chris Albertson wrote:
Anyone use these no-brand ball screws in a machine
Gene,
Although they are often called "thread protectors" , I prefer to call
them adapter pushers.
I have found that their most important function is to be installed
BEFORE the collet adapter and to be used by turning CCW to push
against the collet adapter to remove it. Otherwise you will need
Gene,
I guess you could understand why all the talk about gearboxes and 2
speeds and motors speeding in multiple K revs was confusing me a lot
when I thought you were talking about the Sheldon.
How close was my remembrance to about right?
Cecil
At 10:06 PM 11/30/2017, you wrote:
> Are we
Gene,
If we are talking about the sheldon you got from Tom as I recall, it had:
(These are very approximate numbers based on an admittedly faulty memory)
a) Motor pulley about 4 inches
b) countershaft Pulley (input cone pulley shaft) about 10 inches or so.
so with a "nominal" 3600 rpm motor
I have decided that Santa might bring me a soldering station for
Christmas. The question is... Which one?
Within the last year there has been some discussion on the list about
the quality and prices of "inexpensive" hot air stations.
I searched but could not find the discussions.
I have a
I have decided that Santa might bring me a soldering station for
Christmas. The question is... Which one?
Within the last year there has been some discussion on the list about
the quality and prices of "inexpensive" hot air stations.
I searched but could not find the discussions.
I have a
Peter,
The same thing happened to me and I had to rejoin.
Apparently some of the list members got messages from Sourceforge
asking them to confirm their membership and some didn't. Those who
did not confirm their membership ( which would be those who never got
the memo) were dropped from the
Todd,
I never got any such a request.
At 10:47 PM 8/10/2017, you wrote:
Did you respond to the mailing from Sourceforge asking you to
reconfirm your subscription to the mailing list?
I did and did not loose service.
- Original Message -
__
I've been on this list for over 15 years with no loss of service for
more than a day or so when the list was down.
I received my last posting on 8/2/2017.
I thought maybe the list was down but when I checked:
https://sourceforge.net/p/emc/mailman/emc-users/
I see that postings are still
Gene,
I think you are dealing with ringing as opposed to chatter. Chatter
is usually a low frequency vibration caused by the tool biting in and
releasing repeatedly. The frequency and intensity will change as you
change spindle speed, cutting depth and feed rate.
Ringing on the other hand
I have a friend who has just bought a Dyna-Mite 2400 CNC vertical mill.
I have one myself and it has very solid bones. Mine was stripped
down to the basics and refitted with 200 step nema 23 motors which I
run with linuxcnc and mesa 5i25/7i76.
His is still in mostly original condition with
The half-nuts on my jet 9 inch lathe finally got so bad that I
decided to replace the Acme lead screw with a ball screw.
I bought the cheapest ebay kit with 12 mm screw, nut, nut block and
two supports.
I really don't like to be required to fire up the computer and the
control box and use the
Nicklas,
I guess I didn't describe the setup as well as I could have.
The Gecko 320's are the source of the 20 khz pulses but the 320's are
on the x and z axes and the noise is coming in on the spindle encoder lines.
The noise is there even when the 320's are NOT active and the x and z
motors
I should probably start a new thread here but there is definitely a
similarity in the noise problem.
In my jet 9 x 20 conversion I was getting lots of noise spikes on my
spindle encoder feedback to the 7i78 card.
I went through all the regular suspects, grounding, shielding twisted
pair etc.
Thanks again Andy. It worked.
Even thought my speed control (mc-60) is cheap
and low-tech, I am able to make the speed track
better than +/- 5% from 20 to 1200 rpm under
reasonable thread cutting loads. That ain't bad for recycled junk.
This exercise with the 5i25 and 7i78 has forced
me
Andy,
Thanks for the info.
One of the things I noticed very early on as I
was trying to work all this out by myself is that
the 5i25 card is never mentioned in the documentation.
I see all kinds of examples etc. for 5i20 and
other cards but 5i25 seems to be the red headed step child of
Gregg,
I am using a common treadmill controller called an MC-60. I chose it
after months of research and deliberation --NOT.
Actually it and the motor were in the treadmill that I was given to
get it out of a friends house. It is not four quadrant, just a
simple scr drive, but it works just
Thanks Gene and Andy. I believe Andy's answer is specific enough for
me to implement and I will try it as soon as I get to the shop.
I am pretty slow on the software side of hal and hm2. It is taking
me a while to get my mind around the syntax.
My experience has been that there is a
I am running a cnc'd jet 9x20 lathe with a treadmill motor and dc
motor controller with a 5k pot for speed control in manual.
I previously was running the speed controlled from LCNC from the
parport to an opto interupter for isolation from the motor
controller which worked fine.
I was
Gene,
You don't have to use Phase II. All AXA or 100 series holders are
interchangeable. You can get the the holders here for $10 or $11 if
you want the groove in the bottom so it will hold a boring bar securely.
http://cdcotools.com/
I'm pretty sure the holders you got were AXA or 100
Gene,
Check your in box.
I sent you the answer to your question in the form of a jpeg drawing
for both the internal thread and the external thread.
You can't just use the trig for an equilateral triangle because real
threads are not equilateral triangles but are really trapezoids with
flattened
There is a forum on "Practical Machinist" just for Monarch lathes of
all styles.
Probably your best bet for info on getting it back on its feet.
I have a 10EE of early '50s vintage which is probably a completely
different animal in the drive department as it has a high(direct) and
low(back
Mark,
This is completely off topic but I thought you might be interested.
I have a Tek 511-AD (Tek's first model) vintage somewhere around 1950
or 51 that I managed to rescue from an outside pile of electrical
scrap at McConnel AFB in Wichita Ks in 1971.
It had been laying outside in the rain
Thanks Sebastian.
Obviously it's a small thing pretty much cosmetic but it was worth a try.
Thanks for saving me another couple of hours beating a dead horse.
Cecil
At 02:15 PM 2/6/2016, you wrote:
> >
> >
> > Is there a simple way to make the debug statement drop the trailing
> > zeros when
I have a debug statement in my gear cutting program to tell me what
the program is about to do before I let it start cutting. (sometimes
it can be a surprise)
Some of the variables are obviously integers. For instance the number
of passes or the number of teeth.
I would like to be able to
As promised, here is the follow up:
1. After extensive testing of the A axis running a
non-integer-step-producing angle several thousand iterations it
appears, just as John K said, that the "leftovers' are dealt with
within the planer in an intelligent way and there are no measurable
residual
I have a small lathe that I set up to use a servo drive on the
spindle, essentially making the spindle a rotary axis. The servo was
large enough to provide the torque needed to make the cuts and it
made coordinated spindle moves wonderfully. (think thread cutting,
cam grinding, milling cutter
il
At 02:07 PM 1/3/2016, John wrote:
>On Sun, Jan 3, 2016, at 01:02 AM, Cecil Thomas wrote:
> > My question is about what happens to the "leftovers" when the
> > precision of the g code commanded position cannot be met by the
> > hardware executing it.
>
>Linux
I guess I wasn't as clear as I had hoped about my question.
To be more specific:
When the commanded value for a move is converted into steps (or
microsteps) and that number of steps contains a fractionWhat
happens to the fractional part of a step
I am not speaking of dropped steps as
My question is about what happens to the "leftovers" when the
precision of the g code commanded position cannot be met by the
hardware executing it.
Several years ago I wrote a program to "generate" involute gear teeth
by making multiple cuts of the same tooth from differing angles with
a rack
Gene,
This probably doesn't apply to your situation but when I made the
encoder wheel for my jet 9x20 lathe (the disc was made from one of
those non-functional plastic discs they include in a spindle of dvds
or cds fortunately this one was black)I did the following:
Mount all the interrupters
John,
The disc has 20 slots, about 2.5 deep except for the index slot which
is about .5 deep. I can't see why I would need any more slots for
threading and more slots means higher encoder rates or slower spindle speeds.
I used the same design for the Monarch 10EE and it will reliably cut
90
Opps, Sorry,
Make that .25 inches deep!
Cecil
The disc has 20 slots, about 2.5 deep except for the index slot
Question - how many slots did you put on the
disc? I have an Emco Compact-8 that is the same size as yours, and I'm just
wondering what is the number most people use.
Thanks -
It might be too obvious to point out but I would feel the need to ask
about the current output capability of the 24 and 36 volt supplies or
batteries.
A 36 volt supply that can't output the motor's rated current is not
going to turn the motor as well as a 12 volt supply with ample
current
Gene,
I sent you a private email with a program attached.
I took John's code and spiffed it up a little to make the overall X
and Y dimensions, the corner radius and the feed all variables at the
top of the program.
All you have to do is edit those four variables and you can define
any
I buy the cheapest modeling clay I can find ,usually at Walmart in
the crafts section, and just roll a chunk of it around the surface of
the magnet. Then I toss it. Use a fresh piece the next time.
The chips and dust embed themselves into the clay and stay there. If
you use a chunk too many
Ok, first of all you have permission to laugh but here is my rule of thumb
This is meant for a hobby situation not for industrial situations
where trimming 10 seconds off an operation means the difference
between profit and loss.
For speeds when cutting metal on a lathe or mill using high
John,
If I can get the shop straightened up a bit in
the next couple of days I will try to show a
00-90 being cut on the Derbyshire(tiny), the Griz
9x20 (middle size), and the Monarch 10EE (just right).
Most people are more impressed with the 10EE
making the tiny screw than they are with the
Gene,
This is a little off the thread but you might want to consider using
one of the black dummy CD's or DVD's that come in a stack of new
discs for your encoder disk.
I used one of them for the spindle encoder for both the 9 inch
grizzly and the Monarch 10EE. The disks are about the right
I can't get more than 4k rpms from either of my lathes and I have not
had a stability problem at those speeds. I would have to do a little
testing to see if I would go higher (if I had a machine that could do it).
The size is easily adjusted. I cut mine on my cnc rotary table on my
Millright.
Gene,
The new screws (if single start) move the axis almost twice as far
per step (2.5mm vs 1.27mm) so the new scale will need about half as
many steps to move one inch.
So new scale = old scale x 1.27mm/2.5mm or old scale x .508
New scale = 64000 x .508 = 32512
You could also approach
Gene,
I also have a home brew encoder disk and interrupter set up on a 9x20
jet with a treadmill motor and an M60 controller. I also have a
similar setup on a Monarch 10EE with a 3.5 hp 350 VDC drive motor.
I was having a random problem cutting threads on both machines. The
thread was losing
80 volts is approximately what you get with half wave rectified 120 V AC.
Unfortunately with no filter it might make the brake into a buzzer.
Cecil
On 02/11/2014 01:21 PM, Duesentrieb Yahoo wrote:
have not 80v dc. could take 120vdc.
witch is plus, A or B ?
I'm pretty sure the polarity
Andy,
This one has no index. How did you generate your index pulse?
Cecil
Andy Pugh wrote:
(Cheap eBay encoder, though not the one I used):
http://www.ebay.co.uk/itm/40mm-Outer-Diameter-Incremental-Type-Photoelectric-Encoder-Rotary-Encoder-/281099904847
At that price, if you can find a way to
I used the black dummy CD or DVD (cant remember which) that comes
in a new stack of disks to make my encoder disk.
I cut 20 equally spaced notches about .15 inch deep and made one of
them about .45 deep for the index. I used TTL output optical
interrupters to read the disk with 2 for
I was a little concerned that 20 teeth (80 quadrature) wouldn't be
enough resolution. After cutting a couple of 0-80 and 00-90 screws
on both the machines and testing with commercial nuts and examining
the thread geometry under the microscope I no longer have any
reservations about 80
Thanks John, Andy, Chris and Christopher.
The DEBUG did what I needed for now. I left the m3 s#71 because I
use it to set the speed (PWM) on the little JET 9x20 and it also
gives me a target for the SPINDLE at SPEED LED.
I still have a lot to learn about widgets. Now that I think about it
Andy,
That solution has occurred to me and it might be the way I'll go. I
have the stepper and the gecko to drive for it and room in the
control box. The speed knob is connected to the rheostats by a chain
drive (similar to bicycle chain and sprockets) I can just put a
sprocket on the
I have completed the CNC conversion of my Monarch 10EE except for the
spindle speed control. For now I must set the spindle speed manually
with the speed knob.
Until I have figured out how to control the 10EE speed from
LinuxCNC I would like to have a message or notice to show up in my
Well, I finally finished my homebrew conversion of the 10EE that was
a gift to me back in the spring. Check the short Youtube
http://www.youtube.com/watch?v=D_YMuBrWoWICecil#39;s CNC Monarch
10EE Conversion - YouTube
Background:
The machine is a 1953 Ward Leonard motor/generator type which was
It actually is virtually unchanged from its original
configuration. I think I actually drilled and tapped four 1/4 inch
holes, one 3/16 hole and four 6-32. When I park the ball nut on the
right end of the lead screw and release it from the apron the lathe
is just as manual as it ever was.
I
Stephen,explanation.
I am not sure if I can post attachments to the list but I have posted
the info on Practical Machinist forum so if you click the link below
you will see it
In my 10EE CNC conversion I have decided to go to either a type L
(.375 between teeth) or type T10 (10 mm between teeth). I think I
will need the belts to be heavier than the XL that I used on my
Millrite conversion because the apron drive will require 12 inches
between the pulleys.
Does
Kirk,
Your Standard Engineering Works No. 1 appears to be the spitting
image of my U.S. Machine Tools Cincinnati horizontal mill.
I put a treadmill motor and controller on it and it works great. I
am sure there must have been some relationship or some design
stealing early on between Standard
Kirk,
If you would like I could take a few shots of my machine and send
them off line or can I post them here as attachment. I forget.
I guess at some level of exactness most of any class of machine tool
look pretty much alike and besides if it works... don't fix it!
Cecil
I am in the process of converting a Monarch 10EE to cnc. It was a
gift so no expense up front. If it hadn't been a gift I would not
have paid much or anything for it because it was shipped from Monarch
as a Basic Model in 1953. As a Basic model it is pretty much a
second op machine but a
Looks like this list does accept attachments. I guess I was confusedagain.
Cecil
--
Try New Relic Now We'll Send You this Cool Shirt
New Relic is the only SaaS-based application performance monitoring service
Correction. The AP relay stands for anti-plugging not
anti-pumping. Anti-plugging is to prevent an attempt to change the
direction of a motor while it is still turning at a speed which would
damage the equipment or the controls. Anti-pumping is a term used in
a breaker control circuit to
last two years there
we lived out west off Pawnee. Never saw a tornado but sat out a
couple of near misses in the basement.
Cecil
A scenic commute. You could stop in Wichita for a visit. :)
On May 21, 2013 10:27 PM, Gregg Eshelman g_ala...@yahoo.com wrote:
--- On Tue, 5/21/13, Cecil Thomas
Gregg,
Where do you live?
I don't quote prices since I mostly work for fun but I have an iron
clad business model.
If you bring me something to work on:
1. You must be present throughout the process either doing the work,
helping or standing around waiting.
(This eliminates most requests
One of the greatest of the advantages of a wound field motor No
magnets to degauss. The only thing challenging really quick stops is
inertia.
I was once involved in the power industry and saw the results of a
mis-timmed synrconizing breaker closure on a 600 MW generator turning
3600 rpm.
Gene,
I have a machine with a similar setup, treadmill motor, screwed on
flywheel. I screwed the flywheel on snug, drilled a #6 hole .75 inch
deep parallel to the axis of the shaft but on the pitch line of the
two threads, tapped it 1/4-20 and screwed in a 5/8 inch long 1/4-20
socket head set
Gene,
Please note that I tapped the hole .75 deep and inserted a .625 long
socket head SET screw not a cap screw. There is nothing sticking
out. The second method with the square key was not meant to be
taken seriously since the only way you could ever get the key back
out was to leave
Gene,
I wanted to be sure that you picked up on the fact that the setscrew
is inserted ALONG the thread pitch line PARALLEL to the axis of the
shaft but offset from the shaft axis by the radius of the shaft. So
it in essence forms a round key that CAN BE removed without applying
an
Gene,
My 10EE uses a couple of feet of nichrome coil like you used to see
in oven elements and toasters. It stops a 3 hp dc motor about 18
inches in diameter Probably about 50 pounds of armature plus another
100 pounds of pulleys, spindle and chuck from 3600 rpm in about a
second and a half.
Gene,
You need to remember that the seemingly high hp ratings of these
relatively small motors is due to the very high rpms at which the
ratings are valid.
These 1 1/2 to 2 hp motors develop that hp at 5000 to 6000 rpm. You
will have to rethink your drive coupling system to reduce that speed
Thanks for all the inputs. I did quite a bit of research concerning
the effectiveness vs the amount of work vs the expense of getting the
machine on line and making chips.
1. Tossing the entire drive train and replacing with a 10 hp 3ph
motor and vfd to run from 220 single phase.. can't be
I recently was given a 1953 Monarch 10EE basic Model lathe. It is
the Ward Leonard motor generator type so no electronics to deal with.
The basic model has no lead screw and no gearing for screw cutting.
There is also no taper attachment. It does have carriage and cross
slide power feeds.
I
I used Gecko 320's with no breakout board to drive the X, Z and
spindle. I had converted my millrite to CNC after I found some large
(4 diameter x 6) 30 volt motors that had an encoder shaft but no
encoder. With the big motors on hand and the encoders given to me by
a friend the step and
I have recently converted a jet 9x20 to CNC using gearhead servos on
the x and z and a treadmill motor on the spindle. I made my spindle
encoder out of a CD with 20 notches with one deeper than the rest. I
read the counts with active electronic optical interrupters so the
output is clean and
Pete I'm in East Tennessee as well. Wichita is a long drive from
here. I know because I spent most of my Air Force time at McConnel
AFB in Wichita. That was back in '69 to '72. I've often thought
about going back to visit since I was a resident there so long I
almost became a nativeYou
After several hours of trying to make Spindle-at-speed work as set up
with stepconfig I finally figured out that the custom_postgui.hal
file that stepconfig builds has a built-in error. The file compares
spindle velocity before scaling and before the absolute value is
taken with the spindle
After several hours of trying to make Spindle-at-speed work as set up
with stepconfig I finally figured out that the custom_postgui.hal
file that stepconfig builds has a built-in error. The file compares
spindle velocity before scaling and before the absolute value is
taken with the spindle
Chris,
I am using linuxcnc2.5.2 on ubuntu 10.4. I installed the linuxcnc at
2.5.0 from the live cd and updated to 2.5.2.
I can include the spindle portion of the stepconfig in an email or I
can email it to you off line. It is a little long to include it all
in a post and I am not familiar
Gene,
I CNC'd one of the red Harbor Freight 7x10's by puttting a gearmotor
with encoder (servo) on the lead screw and another on the x axis by
mounting it on the BACK of the saddle with a sliding coupling made by
drilling a cross hole in the end of the cross slide lead screw and
another in the
I have to come out of lurkdom on this subject.
I am one of those who has 3 working systems running from live CD
installations and with the exception of obvious .ini file setup and a
tweak to disable SMI I am using it out of the box.
I have been using EMC since the late 90's when it was on Red
Look around in your junk box to see if you have any 120 ac to low
voltage ac charging transformers for your battery powered drills,
saws, garden clippers etc. The secondary voltage isn't an issue as
you are looking at phase BUT.. make sure they are AC secondary of course.
I have found
Some time back I remember someone saying that they had had very good
luck with the smaller footprint Dell Optiplex models running EMC2
with very low or at least good latency.
I have been looking around and have found several at reasonable
prices but my research has shown that there are about a
Does AXIS or any of the other displays support messages from .ngc or
allow variable inputs.
I would like to place something like (MSG Be sure you have touched
off before continuing this program)
in my code. It would go along with a dwell to allow you to abort the
program if you had forgotten
Thanks for the help on my zero motiion homing problem. I am using
Jeff's workaround and all is working better than expected.
My current project is converting a Derbyshire watchmaker's lathe to
CNC by using a couple of tiny (1 inch diameter by 4 inch long brush
servos on the cross slide (x/y)
Steve,
That's not the one I remember but it looks like it might be even better.
I just spent the last 3 hours thinking I was searching the wiki for
stuff like this and basically came up with nothing.
I guess I don't understand the search methodology. How does one go
about finding stuff in the
Is there some G command that works like the HOME button in AXIS or
TKEMC that simply makes the present position HOME Without
storing offsets in the .var file
I am trying to do what appears to be a simple operation in g code but
it seems to be over my head.
here's the setup:
I am using
I have searched the users and integrators manuals and can't find this
but maybe I've missed it.
When strange things appear on startup of my axis or tkemc it is
usually because there is a value stored in the .var file.
If I zero out the strange numbers and save the .var file and restart
it
I am trying to do what appears to be a simple operation in g code but
it seems to be over my head.
here's the setup:
I am using xyza with rotary axis parallel to X. I am using an endmill
in the spindle to cut a square thread in a round bar in the chuck of
the a axis. to cut a 5 pitch thread of
I am about to format a drive and install Ubuntu/Emc on a newly
aquired pc and I have a couple of questions.
What is a very rough eta on EMC2.2 release? This month, this calender year?
Will the release be on live CD?
I have a working setup with the current version and can re-install it
on the
Stephen asked:
|Is there any particular reason why you chose 2,400,000 for the servo and
|traj periods? I'm sure it will work for these speeds (and it does
|reduce the CPU load marginally), but it shouldn't be necessary to
|lengthen these. Can you share your reason for changing them?
Stephen,
Thanks for the help.
I set my base period to 15,000, servo period to 60,000 and traj
period to 600,000.
I lowered my max vel to .75 (45 inches per minute, plenty fast
enough). Everything seems happy except the realtime error which I
have not run to ground yet.
The RT error was there at the
I am using EMC2 and a gecko servo drive to drive a servo I have
mounted on my Millrite.
When I set the max speed to 1.0 (I think that is 1 ips or 60 ipm) I
get an error saying that the velocity is too high.
I the motor/encoder/gecko drive require 2000 steps per rev and the
lead screw is 5 tpi
Ed,
I have a similar card with that chip and it seems to default to dff0
at least dff0 works for me.
Cecil
At 05:17 PM 6/10/2007, you wrote:
I picked up an add on PCI port to set up for EMC but cannot find the
addresses that it uses. LSPCI reports:
:00:09.0 Parallel controller:Timedia
Alex,
You are right of course. It's only the number that is important. I
guess the default is 1.000. The units don't seem to change anything
except the units displayed in TKEMC or whichever display you use.
I set up an experimental stepper inch which scales correctly on my
machine (input
Ray,
At 07:19 AM 6/7/2007, you wrote:
Glad that we got that all figured out and you've got what you need
going. The ball endmill called out in the chips.ngc program was
intended to be able to handle all those deep cuts without breaking.
I noticed that when I scaled the endmill to be small
Chips is supposed to run on approximately 4 x 4 inch block which is
too big for a sherline based machine.
I got it to run on a 2.5 by 2.5 inch block by using stepper_mm.ini
and changing the input scale on all the axes from 200 to 50.
I tried changing the output scale from 1 to other values but
I'd like to run 3D_chips.ngc on my converted DM (sherline) mill but
it is too big for the little machine.
Is there a trivial way to scale it, for instance changing the Units
variable in the .ini file?
Thanks again,
Cecil
This might be more of an UBUNTU problem than EMC2 but I have to start
somewhere.
I Just set up a new box (Emachines Pentium III 640M ram 80G hd with
working network connection) Using latest LiveCD version and all
updates as of yesterday.
EMC2 runs fine and the machine (converted DM tabletop
Sorry if I seem a little slow, it's only because I am a little slow.
I presently have the Nvidia card installed (in the MGA slot)
The xorg.conf file correctly says:
Section Device
Identifier NVIDIA Corporation NV11 [GeForce2 Mx/Mx400]
Driver nv
Mark,
Of course you're right I meant AGP slot.
I didn't find another Device driver with nvidia in the config file.
I hope that's not bad news.
I really appriciate the help.
Here's the output of lspci
[EMAIL PROTECTED]:~$ lspci
:00:00.0 Host bridge: Intel Corporation 82850 850 (Tehama)
1 - 100 of 101 matches
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