--- On Sat, 3/30/13, cogoman cogo...@optimum.net 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
On 31 March 2013 07:31, Gregg Eshelman g_ala...@yahoo.com 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
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 fast because an
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 because for any faster
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
always
--- On Mon, 3/25/13, jeremy youngs jcyoung...@gmail.com wrote:
From: jeremy youngs jcyoung...@gmail.com
http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0hash=item1e766687c7
Those might be a bit much for the
--- On Mon, 3/25/13, jeremy youngs jcyoung...@gmail.com wrote:
http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0hash=item1e766687c7
i like the idea of using a capstan with offsetting
weight , if you
use
On 26 March 2013 23:49, Gregg Eshelman g_ala...@yahoo.com 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
--- On Tue, 3/26/13, andy pugh bodge...@gmail.com wrote:
On 26 March 2013 23:49, Gregg
Eshelman g_ala...@yahoo.com
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
On 25 March 2013 05:45, Dave e...@dc9.tzo.com 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
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
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, Davee...@dc9.tzo.com wrote:
They abandoned that design in favor of a more conventional CNC design.
I think you would
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
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,
On Mon, Mar 25, 2013 at 12:34 PM, andy pugh bodge...@gmail.com 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
--- On Mon, 3/25/13, Dave e...@dc9.tzo.com wrote:
From: Dave e...@dc9.tzo.com
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
before
On 25 March 2013 22:25, jeremy youngs jcyoung...@gmail.com 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
--- On Mon, 3/25/13, jeremy youngs jcyoung...@gmail.com 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
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 jcyoung...@gmail.com 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
On 26 March 2013 00:48, Gregg Eshelman g_ala...@yahoo.com 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
http://www.ebay.com/itm/3Axis-Nema-23-Stepper-Motor-425oz-in-CNC-Mill-Controller-SD-2H044MA-driver-/130835449799?pt=LH_DefaultDomain_0hash=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
How about just using some air cylinders to pull your counter balance cables.
- Original Message -
On 26 March 2013 00:48, Gregg Eshelman g_ala...@yahoo.com wrote:
Now I'm thinking it needs a semi-active tension system using a computer
controlled 3rd motor but with a spring so it
On 26 March 2013 00:59, jeremy youngs jcyoung...@gmail.com 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
On 26 March 2013 01:07, Todd Zuercher
zuerc...@embarqmail.com 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
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
--- On Mon, 3/25/13, andy pugh bodge...@gmail.com 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
2013/3/24 Gregg Eshelman g_ala...@yahoo.com:
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
On 24 March 2013 08:11, Gregg Eshelman g_ala...@yahoo.com 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
--- On Sun, 3/24/13, Viesturs Lācis viesturs.la...@gmail.com wrote:
From: Viesturs Lācis viesturs.la...@gmail.com
2013/3/24 Gregg Eshelman g_ala...@yahoo.com:
Looking into the possibility of fitting CNC to an old
oxy-acetylene pattern following torch. (It can also mount a
plasma cutter.)
--- On Sun, 3/24/13, andy pugh bodge...@gmail.com 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
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
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