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I was only thinking of the 3dof machines for the glue-gun application as
opposed to the 6dof stewart platforms. As near as I can tell, the transforms
for those don't have singularities, but I could be mistaken.

From a Machinists view and knowing basically what is required for general machining. The Stewart platform, although clever and innovative would have to be built on a massive scale to even be adequate for modest machining including plastics. The key is mass and close tolerance and even resistance in the ways can add to the stability.

From a programming standpoint it would be a challenge. It would be an absolute production and choreography just to move the table two inches and keep it in a straight line and on the same plane radially, square to the spindle etc. Folks have enough trouble getting their cartesian machines to even cut a round circle without backlash etc., can only imagine the issues that would be involved with six actuators attempting to position a table aloft.

These designs are fun to discuss, but the reality is they are way out of the loop for the home shop. Hotwiring styrofoam possibly, but not even machining plastics.

Just my opinion, Ron

Graham Stabler <eexgs@...> wrote:
--- In CAD_CAM_EDM_DRO@..., "Dennis Schmitz"
<denschmitz@...> wrote:

In any case, this also appears to be compatible with the
goals of the reprap project. It seems that this design would be
simpler to build than a cartesian positioner, and since reprap

doesn't >require the rigidity of a mill, this might be a more
versitile design.

No way, a hexapod is a can of worms. Software, calibration, joint
accuracy, singularities etc etc

Plus you need 6 motor drivers and motors and you don't even need
6-axis control.

A triaglide perhaps but not hexapod. Especially an unproven virtual
design (as far as I can tell)

Graham

--- In CAD_CAM_EDM_DRO@..., "Dennis Schmitz"
<denschmitz@...> wrote:

In any case, this also appears to be compatible with the
goals of the reprap project. It seems that this design would be
simpler to build than a cartesian positioner, and since reprap

doesn't >require the rigidity of a mill, this might be a more
versitile design.

No way, a hexapod is a can of worms. Software, calibration, joint
accuracy, singularities etc etc

Plus you need 6 motor drivers and motors and you don't even need
6-axis control.

A triaglide perhaps but not hexapod. Especially an unproven virtual
design (as far as I can tell)

Graham

Wow, it works even with Windows 98 when saved on anywhere c:&#92; and click.
You may use other PC to run.

No it has to reside in C:&#92;Gear to work, - THEN it will generate the library.
Inside W2K it can't make the folder C:&#92;gear, you have to do this and put the exe file into this.

On your start screen it states where the output file will be saved but if you don't have a folder called c:&#92;gear it can't save there.
You need to edit your instructions or make it generate the folder name.

John S.

John Stevenson <john@...> wrote:

My programs make a library and have undercut geometry that users can see in
graphics and read undercutting information by numerical data.

Only if the program runs.
When I run the exe file it crashes with a memory error.
Not managed to run it yet.

John S.

John Stevenson <john@...> wrote:

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Sorry doesn't work for me under W2K.
keeps coming up with memory error and crashes.

I also notice that you have the 14.5 PA gears starting at 30 teeth but many
people do have to cut them at a lesser number.
I realise that there will be undercutting but sometimes you have to go lower
then 30 and accept the consequences.

John S.






---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.

[Non-text portions of this message have been removed]

---------------------------------
Stay in the know. Pulse on the new Yahoo.com. Check it out.

[Non-text portions of this message have been removed]

Wow, it works even with Windows 98 when saved on anywhere c:&#92; and click.
You may use other PC to run.


John Stevenson <john@...> wrote:

My programs make a library and have undercut geometry that users can see in
graphics and read undercutting information by numerical data.

Only if the program runs.
When I run the exe file it crashes with a memory error.
Not managed to run it yet.

John S.

John Stevenson <john@...> wrote:

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Sorry doesn't work for me under W2K.
keeps coming up with memory error and crashes.

I also notice that you have the 14.5 PA gears starting at 30 teeth but many
people do have to cut them at a lesser number.
I realise that there will be undercutting but sometimes you have to go lower
then 30 and accept the consequences.

John S.






---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.

---------------------------------
Stay in the know. Pulse on the new Yahoo.com. Check it out.

I'm curious about the Stewart platform, and what kind of actuators might be
salvaged to create a small one - like meter or less in dia? I suppose just
some salvage steppers with threaded rod, but if others might have better
ideas, I'd love to hear. One of these "sandtables" would be cool to build.





Chuck Merja

Dear Dennis,

Thank you for the tip.
I think we'll start about by making a cartesian robot, i.e. some traditional

mill/gantry/router type thing, and then eventually move over to a Stewart
platform.
<>
.org/wiki/Stewart_platform
(I'm including the above link for the benefit of others. I know you know
what
a Stewart platform is.)

_

I had found a Birdgprot II with low voltage board problems and was going to
ask what it would take money and time wise to put in a new set of controls.
This post prompts me to finally ask - and also ask what system would you
guys install?

Chuck Merja

Elliot,
I'm within easy hauling range of Goleta, but I have to wait a few
weeks until I save up enough money for a funeral. My wife would kill
me if I bought another mill.

Marv Frankel
Los Angeles

I'm suprised it hasn't gone already.
All you read are posts about people whinging about "I can't find a mill etc.
" and when one pops up they convieniantly ignore it then post later "I wish
I had known"

Read it again.
Bridgy with all the guts ripped out saving you the hassle.
Chrome ways, ballscrews etc etc.
Then throw in a 4th axis and tooling and at $400 you have stolen it.

My programs make a library and have undercut geometry that users can see in
graphics and read undercutting information by numerical data.

Only if the program runs.
When I run the exe file it crashes with a memory error.
Not managed to run it yet.


John S.

John Stevenson <john@...> wrote:

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Sorry doesn't work for me under W2K.
keeps coming up with memory error and crashes.

I also notice that you have the 14.5 PA gears starting at 30 teeth but many
people do have to cut them at a lesser number.
I realise that there will be undercutting but sometimes you have to go lower
then 30 and accept the consequences.

John S.






---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.

[Non-text portions of this message have been removed]

My programs make a library and have undercut geometry that users can see in graphics and read undercutting information by numerical data.

John Stevenson <john@...> wrote:

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Sorry doesn't work for me under W2K.
keeps coming up with memory error and crashes.

I also notice that you have the 14.5 PA gears starting at 30 teeth but many people do have to cut them at a lesser number.
I realise that there will be undercutting but sometimes you have to go lower then 30 and accept the consequences.

John S.






---------------------------------
Do you Yahoo!?
Get on board. You're invited to try the new Yahoo! Mail.

Elliot,
I'm within easy hauling range of Goleta, but I have to wait a few
weeks until I save up enough money for a funeral. My wife would kill
me if I bought another mill.

Marv Frankel
Los Angeles

I'm suprised it hasn't gone already.
All you read are posts about people whinging about "I can't find a mill etc. " and when one pops up they convieniantly ignore it then post later "I wish I had known"

Read it again.
Bridgy with all the guts ripped out saving you the hassle.
Chrome ways, ballscrews etc etc.
Then throw in a 4th axis and tooling and at $400 you have stolen it.


John S.

--- In CAD_CAM_EDM_DRO@..., "Elliot Burke" <elliot@...> wrote:

For sale a Bridgeport Series I CNC mill,
This has a 2 hp head, chromed ways, big-ass stepper motors, ball screws,
oiler, etc.
The electronics have been ripped out, but their boxes remain.

It comes with a 6" Bridgeport vise and 14 tools in collets.
There is also an indexer with compressed air/electric drive, not

quite sure

I understand that thing.

This in in zip 93117, Goleta CA.

The first $400 takes it all, you have to arrange for putting it in your
vehicle, since it is in my garage now and I have no forklift.

contact me at optics22000@...

regards-
Elliot
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.4/424 - Release Date:

8/21/2006

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Sorry doesn't work for me under W2K.
keeps coming up with memory error and crashes.

I also notice that you have the 14.5 PA gears starting at 30 teeth but many people do have to cut them at a lesser number.
I realise that there will be undercutting but sometimes you have to go lower then 30 and accept the consequences.

John S.

I Shipped mine 12,000 miles. and then converted it- with the guidance of John Stevenson UK

Get on the road.!

Neil Robertson
Invercargill
New Zealand

Hi, everybody.

I have just begun to upload my programs that generate gear tooth
geometry in dxf format and numerical data in txt format.
It's free to download and use my programs. Very simple to run.
However, two or more programs should Not be run at a time because
they could interfere each other.

If you are going to wire-cut gears and don't know how to generate
gear tooth geometry, e-mail me. I can generate coordinates of path
of wire ceter to cut gears with designed tooth thickness or backlash.
I am especially interested in wire-cutting gears. Also, a set of cnc-
cut planetary gear can be seen in my top page of website.

Thank you very much.



Chang H. Park
Hobbing.com

Elliot,
I'm within easy hauling range of Goleta, but I have to wait a few
weeks until I save up enough money for a funeral. My wife would kill
me if I bought another mill.

Marv Frankel
Los Angeles


--- In CAD_CAM_EDM_DRO@..., "Elliot Burke" <elliot@...> wrote:

For sale a Bridgeport Series I CNC mill,
This has a 2 hp head, chromed ways, big-ass stepper motors, ball screws,
oiler, etc.
The electronics have been ripped out, but their boxes remain.

It comes with a 6" Bridgeport vise and 14 tools in collets.
There is also an indexer with compressed air/electric drive, not

quite sure

I understand that thing.

This in in zip 93117, Goleta CA.

The first $400 takes it all, you have to arrange for putting it in your
vehicle, since it is in my garage now and I have no forklift.

contact me at optics22000@...

regards-
Elliot
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.4/424 - Release Date:

8/21/2006

Dear Dennis,

Thank you for the tip.
I think we'll start about by making a cartesian robot, i.e. some traditional
mill/gantry/router type thing, and then eventually move over to a Stewart
platform.

(I'm including the above link for the benefit of others. I know you know what
a Stewart platform is.)

The one thing a cartesian robot has going for it is that it's easier to
design, build, control and troubleshoot, because it's conceptually simpler.
(It's something the reprap group discussed briefly some time ago.) Stewart
platforms are harder to figure out, but I think they make more economic use
of materials, require smaller motors, etc.

On the other hand, even someone who's very clever would have trouble building
one in a weekend, like this thing:





Once we've got a few reprap units going, we'll think about switching over, and
using those systems to bootstrap a stewart platform.

Still, I'll drop that guy a note.

Regards,
-Sebastien

On Sunday 27 August 2006 16:16, Dennis Schmitz wrote:

Again with my broken record about the spidery looking parallel robot...

I ran across this website which has what appears to be an open design:

It hasn't been updated in quite some time, basically because the guy who
wrote it got a job. In any case, this also appears to be compatible with
the goals of the reprap project. It seems that this design would be simpler
to build than a cartesian positioner, and since reprap doesn't require the
rigidity of a mill, this might be a more versitile design. Judging from the
stated intent on the website, the author might be willing to donate it to a
GPL type open license.






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Yahoo! Groups Links

Again with my broken record about the spidery looking parallel robot...

I ran across this website which has what appears to be an open design:


It hasn't been updated in quite some time, basically because the guy who
wrote it got a job. In any case, this also appears to be compatible with the
goals of the reprap project. It seems that this design would be simpler to
build than a cartesian positioner, and since reprap doesn't require the
rigidity of a mill, this might be a more versitile design. Judging from the
stated intent on the website, the author might be willing to donate it to a
GPL type open license.

Can anyone help me with information on a servo motor Electro Craft
Corp part number 0671-05-00? Any good for use on a mill conversion?

regards,
Kevin

Elliot Burke wrote:

For sale a Bridgeport Series I CNC mill,
This has a 2 hp head, chromed ways, big-ass stepper motors, ball screws,
oiler, etc.
The electronics have been ripped out, but their boxes remain.

It comes with a 6" Bridgeport vise and 14 tools in collets.
There is also an indexer with compressed air/electric drive, not quite sure
I understand that thing.

This in in zip 93117, Goleta CA.

The first $400 takes it all, you have to arrange for putting it in your
vehicle, since it is in my garage now and I have no forklift.

AUGHHHHHhhhhhh!!!!!! This is 2000 miles from me, DARN it! If this was within a couple
hundred miles, I'd already be on the road!

Jon

For sale a Bridgeport Series I CNC mill,
This has a 2 hp head, chromed ways, big-ass stepper motors, ball screws,
oiler, etc.
The electronics have been ripped out, but their boxes remain.

It comes with a 6" Bridgeport vise and 14 tools in collets.
There is also an indexer with compressed air/electric drive, not quite sure
I understand that thing.

This in in zip 93117, Goleta CA.

The first $400 takes it all, you have to arrange for putting it in your
vehicle, since it is in my garage now and I have no forklift.

contact me at optics22000@...

regards-
Elliot
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.4/424 - Release Date: 8/21/2006

Thanks for the help and information guys. I will have to ponder this
one for a while to see what I can come up with.

Chris