On 31 March 2013 07:31, Gregg Eshelman wrote:
> So, yeah, no servo drive available to us mere mortals is going to be able
> to out-accelerate gravity.
This doesn't add up.
Any Z-axis capable of lifting the head can out-accelerate gravity. All that
is required is for the force exerted by the ac
--- On Sat, 3/30/13, cogoman wrote:
> Acceleration due to gravity = 16 feet/second/second
One thing I do remember from junior high science class is gravity acceleration
is 32 feet/second/second on Earth. 'Course I looked it up just now to be sure.
;-)
So, yeah, no servo drive available to us
On Saturday 30 March 2013 22:30:04 dave did opine:
> On Sat, 2013-03-30 at 17:34 -0400, Gene Heskett wrote:
> > On Saturday 30 March 2013 17:32:05 cogoman did opine:
> > > On 03/26/2013 01:21 AM, Gregg Eshelman wrote:
> > > >> I am not sure you will see good acceleration. In fact, it is
> > > >>
On Sat, 2013-03-30 at 17:34 -0400, Gene Heskett wrote:
> On Saturday 30 March 2013 17:32:05 cogoman did opine:
>
> > On 03/26/2013 01:21 AM, Gregg Eshelman wrote:
> > >> I am not sure you will see good acceleration. In fact, it is
> > >>
> > >> >always
> > >> >going to be less than 1g. This is be
On Saturday 30 March 2013 17:32:05 cogoman did opine:
> On 03/26/2013 01:21 AM, Gregg Eshelman wrote:
> >> I am not sure you will see good acceleration. In fact, it is
> >>
> >> >always
> >> >going to be less than 1g. This is because for any faster
> >> >acceleration
> >> >the strings go slack as
right but accel will still only be 1 g where as larges servo systems and
smalll precision high speed machines are capable of several g's . accel is
pretty important to a plasma table. one thing i like about the idea of a
pantograph style is the lack of mass in the supporting structure .
obviously t
On 03/26/2013 01:21 AM, Gregg Eshelman wrote:
>> I am not sure you will see good acceleration. In fact, it is
>> >always
>> >going to be less than 1g. This is because for any faster
>> >acceleration
>> >the strings go slack as the weighs don't fall fast enough.
> No need to go anywhere near that fa
--- On Mon, 3/25/13, jeremy youngs wrote:
> From: jeremy youngs
http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0&hash=item1e766687c7
Those might be a bit much for the torch arm, 3 newton meters. That's the to
--- On Tue, 3/26/13, andy pugh wrote:
> On 26 March 2013 23:49, Gregg
> Eshelman
> wrote:
>
> > Not a problem building the table, he has plenty of
> precision ground shaft and linear bearings at his shop that
> have been laying about, looking for something to be done
> with them.
>
> I like th
On 26 March 2013 23:49, Gregg Eshelman wrote:
> Not a problem building the table, he has plenty of precision ground shaft and
> linear bearings at his shop that have been laying about, looking for
> something to be done with them.
I like the HBot layout. (I reckon it would be another good use
--- On Mon, 3/25/13, jeremy youngs wrote:
> http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0&hash=item1e766687c7
>
>
> i like the idea of using a capstan with offsetting
> weight , if you
> use 2 motors for x
--- On Mon, 3/25/13, andy pugh wrote:
> I am not sure you will see good acceleration. In fact, it is
> always
> going to be less than 1g. This is because for any faster
> acceleration
> the strings go slack as the weighs don't fall fast enough.
No need to go anywhere near that fast because an ox
Andy said
"I am not sure you will see good acceleration. In fact, it is always
going to be less than 1g. This is because for any faster acceleration
the strings go slack as the weighs don't fall fast enough."
jeremy bounces head of keyboard realizes his stupidity and pays homa ge :)
whats that h
On 26 March 2013 01:07, Todd Zuercher
wrote:
> How about just using some air cylinders to pull your counter balance cables.
That would work, and with a set of pulleys (like a 4:1
block-and-tackle) the travel could be only a fraction of the total
string length.
--
atp
If you
On 26 March 2013 00:59, jeremy youngs wrote:
> i like the idea of using a capstan with offsetting weight , if you
> use 2 motors for x,y then use the same weight in tension the motors
> will see nothing but frictional resistance . If your capstan is
> sufficently large you should see very good a
How about just using some air cylinders to pull your counter balance cables.
- Original Message -
On 26 March 2013 00:48, Gregg Eshelman wrote:
> Now I'm thinking it needs a semi-active tension system using a computer
> controlled 3rd motor but with a spring so it doesn't have to be sup
http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0&hash=item1e766687c7
i like the idea of using a capstan with offsetting weight , if you
use 2 motors for x,y then use the same weight in tension the motors
will s
On 26 March 2013 00:48, Gregg Eshelman wrote:
> Now I'm thinking it needs a semi-active tension system using a computer
> controlled 3rd motor but with a spring so it doesn't have to be super precise
You could just run a DC or brushless motor at a constant current on
the third drum, and simply
--- On Mon, 3/25/13, jeremy youngs wrote:
> I guess the real question is then are
> you going to do it?
> if so will you post your results ?
> i would like to see them i think this could be a very
> inexpensive
> solution using small steppere and 1/8 in cable a few scraps
> lying
> around and pre
I guess the real question is then are you going to do it?
if so will you post your results ?
i would like to see them i think this could be a very inexpensive
solution using small steppere and 1/8 in cable a few scraps lying
around and presto a simple plasma cutter :)
--
jeremy youngs
-
--- On Mon, 3/25/13, jeremy youngs wrote:
> or cable attached weight so as to have constant tension ,
> my thought is how to maintain spool diameter on the
> steppers? as cable
> winds up then the diameter increases unless a capstan of
> some sort is utilized,
Lots of ways to do that. Wrap a few
On 25 March 2013 22:25, jeremy youngs wrote:
> or cable attached weight so as to have constant tension ,
> my thought is how to maintain spool diameter on the steppers? as cable
> winds up then the diameter increases unless a capstan of some sort is
> utilized,
There is a nicely engineered solut
--- On Mon, 3/25/13, Dave wrote:
> From: Dave
> Subject: Re: [Emc-users] Cable drive for a gas torch pattern follower?
> To: emc-users@lists.sourceforge.net
> Date: Monday, March 25, 2013, 10:40 AM
>
> I don't know if you have seen the Torchmate version or not
> b
On Mon, Mar 25, 2013 at 12:34 PM, andy pugh wrote:
> This would probably work in a bipod conficuration, with just a pair of
> springs on the hinges to extend the arm.
> Like this device:
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Koppi's_Toy
> With gravity replaced by springs.
or cable attached
Yes is the short answer. From some of the other answers you can get
details.
The only real question comes in can you use canned kenimatics or are custom
ones required. Even modifying canned ones isn't to hard and this group can
always be available for consistance.
On Mar 24, 2013 2:11 AM, "Greg
This would probably work in a bipod conficuration, with just a pair of
springs on the hinges to extend the arm.
Like this device:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Koppi's_Toy
With gravity replaced by springs.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
--
I just noticed that Torchmate is now part of Lincoln Electric (a big
welder manufacturer in the US).
Dave
On 3/25/2013 4:55 AM, andy pugh wrote:
> On 25 March 2013 05:45, Dave wrote:
>
>
>> They abandoned that design in favor of a more conventional CNC design.
>> I think you would be smart
I don't know if you have seen the Torchmate version or not before but
here are some similar picts and discussion.
http://www.cnczone.com/forums/cnc_plasma_waterjet_machines/31685-cnc_retrofit_heath_torchmate_upright_magnetic_follower_shape_cutter.html
The Torchmate I remember was only big enoug
On 25 March 2013 05:45, Dave wrote:
> They abandoned that design in favor of a more conventional CNC design.
> I think you would be smart in doing the same.
I wonder if they abandoned it because they didn't have LinuxCNC kins?
Having said that, it does seem that by the time you have engineered
I think that Torchmate used to make those years ago prior to their intro
into CNC cutting.
I considered buying the kit long ago but considered it too limiting.
They abandoned that design in favor of a more conventional CNC design.
I think you would be smart in doing the same.
Dave
On 3/24/20
--- On Sun, 3/24/13, andy pugh wrote:
> At first I thought you were talking about motorising the
> existing
> arms, but reading more carefully, I think you are talking
> about
> pulling the arm around with cables and drums?
> When I thought you were talking about motorising the arm I
> was going
--- On Sun, 3/24/13, Viesturs Lācis wrote:
> From: Viesturs Lācis
> 2013/3/24 Gregg Eshelman :
> > Looking into the possibility of fitting CNC to an old
> oxy-acetylene pattern following torch. (It can also mount a
> plasma cutter.)
> >
> > The torch mounts on the end of an articulated arm with
On 24 March 2013 08:11, Gregg Eshelman wrote:
> I've been thinking that a system with three or four servo motors and cables
> connected to the torch mount could move it around as well as a 2-axis gantry.
>
> Can LinuxCNC run such a setup?
At first I thought you were talking about motorising the
2013/3/24 Gregg Eshelman :
> Looking into the possibility of fitting CNC to an old oxy-acetylene pattern
> following torch. (It can also mount a plasma cutter.)
>
> The torch mounts on the end of an articulated arm with two joints.
>
> Can LinuxCNC run such a setup?
>
The description really looks
Looking into the possibility of fitting CNC to an old oxy-acetylene pattern
following torch. (It can also mount a plasma cutter.)
The torch mounts on the end of an articulated arm with two joints. On top of
the arm is a variable speed motor with a 1/4" diameter, knurled, magnetic
shaft. That ru
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