开云体育

Darrell Gehlsen wrote:

From: "Darrell Gehlsen" <dgehlsen@...>

Looks like I need help again.
I loaded the latest EMC and compiled it. Next I made some changes in the ini and run files for memory and linux versions.
When I try to run EMC I get the following error:

Starting steppermod.o...plat/rtlinux_09J/lib/steppermod.o: unresolved symbol stepperCount can't install it.

Where do I go from here?
Darrell

Darrell

I don't think steppermod works in this version too well. A couple of
others
and myself were unable to get it to work, but if you use freqmod instead
it
works ok. Also theis version's ini file comes with the rt platform
section
set to sim. Make sure the rt_Plat setting points to your rtlinux_09j.
There
are 2 or 3 areas in the ini file that you need to change.


bill

Looks like I need help again.
I loaded the latest EMC and compiled it. Next I made some changes in the ini and run files for memory and linux versions.
When I try to run EMC I get the following error:

Starting steppermod.o...plat/rtlinux_09J/lib/steppermod.o: unresolved symbol stepperCount can't install it.

Where do I go from here?
Darrell

Joe, I've used a friction drive setup with good results. You can use an encoder on a contact wheel to track where the
circumference axis is.

What is the largest diameter tube you want to handle? I have an old 4 inch pipe threader that I might be persuaded to part with.
You could also make an iris type clamp that would center a wide range of sizes.

Jay Hayes


Joe Vicars wrote:

From: Joe Vicars <jvicars@...>

What you describe is a friction drive which I considered. There are
pipe welders with this configuration. But there are issues with
friction drive as well.

Snip

What you describe is a friction drive which I considered. There are
pipe welders with this configuration. But there are issues with
friction drive as well.

As for standard formulas for pipe intersections there are no
formulas (to my knowledge) but there are templates that you can
construct with old fasioned drafting techniques. But these templates
are extremely limited. The machine I designed allows you to intersect a
round tube with any shape (rectangle, planes, etc) and allows multiple
tube intersections like an exhaust manifold. It also maintains the
angular relationship between joints on either end of the tube, which is
the hardest part to "eyball" when building chassis via the traditional
methods of closed loop "grind and check".
The problem with notching tube this way is that the wall thickness
messes up the theoretical "perfect" joint and has to be corrected
for. Any joint cut at any angle other than 90 degrees has this
problem, and it can get very tricky to deal with. This is why race car
chassis and such (tubular space frames) are still built by hand.
Joint Jiggers, and Hole Saw type tubing notchers cut "real" joints
but are severely limited when it comes to steep angles and multiple
intersections.
Peace.

Instead of friction drive, when above a specific size, how about a big
V block with an automatically actuated clamp. You couldn't turn at
real high rpms without ballance issues, but I don't know what sort of
speeds you cut at. It would mean that your cutter would need to cope
with something rotating around other than its center, so it could be
impossible to get workng.

At obscene prices, new, but not unheard of as surplus from the oil
patch, are 3 and 6 jaw chucks with very large thru holes. (typicaly
something like a 15" chuck, with a 6" thru hole)

If it were me, I would just make a set of bushings for each tube size
I ran. all with a constant OD, and split into two halves. (I have a
bunch of square ones, that I use on bike tubing -- I clamp one on, and
use the flats to ensure the holes are either coplanar or at a true 90
degrees. It doesn't come off untill the brazing is done. (ex: of two
90 degree miters is the down tube on a bicycle -- its a vertical,
angled miter at the head tube, and a horizontal (often with clearance
issues on top) at the bottom bracket (the tube that holds the pedal
axle))


-dp-

From: Joe Vicars <jvicars@...>

What I call the R-theta tubing notcher is more accurately described
as a rotary x-y plasma cutter. The machine control thinks it is
controlling a regular x-y coordinate system except that x is really the
circumference of a cylinder.
This machine was designed to make tubular space frames like race car
chassis and such. Using a solid modeling package (Solid Edge in this
case) You can make intersecting cuts of almost any shape (as long as
one of them is a cylinder). Then you can "unfold" the curve and tell
the machine to cut in x-y coordinates.
A company in texas makes a machine that does the same thing as mine
except it costs about 10 grand and doesn't have bar feed. Check out




One of the serious challenges I have faced is the ability to chuck
different size tube. Right now I have bushings of different I.D.'s to
accommodate different diameter tubes, and a different config. file in
the controller (note that steps per inch changes with tube diameter)
You will see from the above web site that a chuck with a 4" thru
hole is a monster. I tried collets but ran into the same thru hole
problem. 5C is limited to about 1", and larger collets are very costly,
and hard to come by.
I would like to build a chuck as is found in new pipe threading
machines. Run forward and it tightens, reverse, loosens. Can anyone
give me insight as to how these chucks are designed?

A machine like this, is another one of many unstarted projects.

Why "Chuck" it at all?

I figured a couple of sets of rollers the pipe sat on/between with
idler/hold-down rollers on top would do it, and easily accept many
different sizes of pipe.

Ugly ASCII Art: O <-hold-down
O <-pipe
O O <-rollers

This presumes 2 things the pipe is straight and that it is not fixed,
as in already welded to something else.

This is also presumed with the other system.

If this is not the case you could always build the system with the
rollers close together, and of light enough materials to allow the
machine to clamp on and rotate around the pipe instead.


Aren't there standard formulas for most pipe intersection
configurations?

Marc

What I call the R-theta tubing notcher is more accurately described
as a rotary x-y plasma cutter. The machine control thinks it is
controlling a regular x-y coordinate system except that x is really the
circumference of a cylinder.
This machine was designed to make tubular space frames like race car
chassis and such. Using a solid modeling package (Solid Edge in this
case) You can make intersecting cuts of almost any shape (as long as
one of them is a cylinder). Then you can "unfold" the curve and tell
the machine to cut in x-y coordinates.
A company in texas makes a machine that does the same thing as mine
except it costs about 10 grand and doesn't have bar feed. Check out




One of the serious challenges I have faced is the ability to chuck
different size tube. Right now I have bushings of different I.D.'s to
accommodate different diameter tubes, and a different config. file in
the controller (note that steps per inch changes with tube diameter)
You will see from the above web site that a chuck with a 4" thru
hole is a monster. I tried collets but ran into the same thru hole
problem. 5C is limited to about 1", and larger collets are very costly,
and hard to come by.
I would like to build a chuck as is found in new pipe threading
machines. Run forward and it tightens, reverse, loosens. Can anyone
give me insight as to how these chucks are designed?

I used Desk NC with a plasma retro fit I did a few months ago. It took a little playing with the machine configuration file to
get everything running right.

I must second what Joe said about support from Carl. I had a problem when my customer's new computer had a 3D video card that
wouldn't allow Desk NC to open. Carl spent several days sending me test programs and revisions to solve the problem.

The other problem I had, not related to Desk NC, was electronic noise from the plasma arc, causing erratic motion when the arc
was iniated or if the cut path ran off the edge of the metal being cut. I was running a servo system and it seemed that the
noise was getting in to the servo drivers via the encoder cables. I shielded the cables, which helped the problem to some
extent. Finally I moved the servo driver enclosure several feet away from the cutting head and rerouted the leads to the cutting
head away from the enclosure. That eliminated the problem.

Joe, I'd be interested in hearing more about your R-theta tubing notcher.

Jay Hayes
Weston, WV

Joe Vicars wrote:

From: Joe Vicars <jvicars@...>

Peter,
Give me about a week to get my x-y plasma table finished. Then I
will be very interested in going over issues like the one you described.

I used DeskNC for about a week on my R-theta tubing notcher without
any noticible issues. But I had to remove the motors to build the x-y
gantry.

As a side note, I must give praise to Carl at DeskNC. During the
construction of my R-theta machine he was emailing me almost
instantaneous responses for more than a week to help with my problems
(and I am not a paying customer). I intend to buy a copy of DeskNC even
though I may move to other software for future machines. Check's in the
mail Carl.

Snip

I agree completely, one cable to the PC would be a blessing! I wind up
with enough stuff laying on the benches in my shop, Another factor to
consider, if you purchased multiple boards and mounted one on / near each
machine you have converted to CNC it becomes an easy matter to switch the PC
between CNC machines. You could even use one of the switch boxes that
switches all 25 lines to select which machine you are going to control.
Sounds like the wonder board is headed in the right direction to me.

John Guenther

Peter,
Give me about a week to get my x-y plasma table finished. Then I
will be very interested in going over issues like the one you described.

I used DeskNC for about a week on my R-theta tubing notcher without
any noticible issues. But I had to remove the motors to build the x-y
gantry.

As a side note, I must give praise to Carl at DeskNC. During the
construction of my R-theta machine he was emailing me almost
instantaneous responses for more than a week to help with my problems
(and I am not a paying customer). I intend to buy a copy of DeskNC even
though I may move to other software for future machines. Check's in the
mail Carl.

I like the sound of these boards, and will buy a couple if they ever
exist. But I would only use them if they are external to the PC- I do
not see how all the screw terminals would make sense on a PC board-
think of the mess in back of the machine with all those wires. I like
the idea of a small board that could be mounted near the machine with
the various limit switch, step and dir signals, maybe a panic button,
maybe a ss realy switching drive motor power etc, then just one nice
parallel port cable to the back of the computer.

ron

In a message dated 02/28/2000 5:30:12 PM Hawaiian Standard Time,
multi-volti@... writes:

<< I found a seller who will only sell three motors.

I only want one (sound familiar?), but he won't sell me just one <snip>

Anyone need two hefty motors so I can buy the third?

Murray >>

Murray,
If you ever go "Belly up" with that one motor, you will be out of luck
finding one at your local Rat Shack. You might get rid of one but I would not
get rid of two.....

IMHO

Peter
THRD, Inc.

In a message dated 02/28/2000 11:50:07 AM Hawaiian Standard Time,
dfs@... writes:

<< DB25 and screw term capable input >>

I believe Doug was speaking of the euro screw terminals.

Peter
THRD, Inc.

Hello:

In my quest for the mother-of-all-steppers (haven't found any NEMA 66, had
to settle for a NEMA 42), I found a seller who will only sell three motors.

I only want one (sound familiar?), but he won't sell me just one because he
anticipates most machine users want three axis capability.

He says the 840 oz-in motors are used, not new. $225 each plus shipping. I
guess the simplest thing is for me to buy all three, so someone doesn't
skunk me by buying all three.

Anyone need two hefty motors so I can buy the third?

Murray

This is the link to Tom's page that I have.



Jim Geib
Mansfield, Ohio

Try

Tim
[Denver, CO]

Can someone point me to Tom Kulaga's DRO application program?

Thanks

Charles Hopkins

A while ago Iwas trying to get linux to work on a second HD by installing as
pimary HD then swapping IDE leads etc. and using the bios to boot from HD2
without having lilo on my HD1. loads of error mesages ... like kernel panic
fatal this and that........ then I messed it up properly with lilo and I
couldnt even get win 95 to boot (I have previosly installed linux
successfully but wanted it on another disk) the way out of this was to get a
shareware prog called part beta (ranish patition manager) Its probably
harder to use than a commercial prog but you can change partition sizes,
make new ones and mess with boot sectors without wiping you disk, It might
get some of us out of trouble without breaking the bank. It says beta but It
seems to work ok. I found it on ZDnet downloads.