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-----Original Message-----
From: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...>
Date: Tuesday, February 29, 2000 6:42 AM
Subject: [CAD_CAM_EDM_DRO] Digest Number 384

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There are 15 messages in this issue.

Topics in today's digest:

1. RE: resonance and controllers
From: "Harrison, Doug" <dharrison@...>
2. xyz table for sale?
From: "Jim Fackert" <jfackert@...>
3. RE: Wonderboard PC interface original message!
From: "Harrison, Doug" <dharrison@...>
4. RE: Wonderboard PC interface original message!
From: "jguenthe" <jguenthe@...>
5. Re: re - Wonderboard PC interface
From: "D.F.S." <dfs@...>
6. RE: DRO UPDATE
From: "Terry May" <tmay@...>
7. Feedback wanted
From: Charles Gallo <Charlie@...>
8. Re: RE: DRO UPDATE
From: "A. G. Eckstein" <axtein@...>
9. DRO
From: Charles Hopkins <chopkins@...>
10. Re: DRO
From: "Tim Goldstein" <timg@...>
11. Re: DRO
From: "Jim Geib" <jimg47@...>
12. For sale: two used Superior Electric 840 oz-in steppers
From: "Multi-Volti Devices" <multi-volti@...>
13. Re: re - Wonderboard PC interface
From: ptengin@...
14. Re: For sale: two used Superior Electric 840 oz-in steppers
From: ptengin@...
15. Re: is my software stable?
From: "Peter Smith" <peter@...>


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Message: 1
Date: Mon, 28 Feb 2000 09:18:25 -0500
From: "Harrison, Doug" <dharrison@...>
Subject: RE: resonance and controllers

-----Original Message-----
From: Joe Vicars [SMTP:jvicars@...]
Sent: Friday, February 25, 2000 1:59 PM
To: CAD_CAM_EDM_DRO@...
Subject: [CAD_CAM_EDM_DRO] resonance and controllers

From: Joe Vicars <jvicars@...>

I don't understand how the software control contributed to the
resonance problem that Tim described. The software controller just
outputs a square wave of varying frequency. If you have control over
your instantaneous start, accel and decel, then you should be able to
find an operating range that works. What am I missing?

Some programs are not very good at accurately spacing the step
pulses. The variation in timing shows up as harmonics and the effects are
significant.

Doug


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Message: 2
Date: Mon, 28 Feb 2000 10:08:02 -0500
From: "Jim Fackert" <jfackert@...>
Subject: xyz table for sale?

Will the fellow who had the xyz router table with servos for sale please
email me off list?

Thanks,

Jim Fackert
jfackert@...




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Message: 3
Date: Mon, 28 Feb 2000 15:20:27 -0500
From: "Harrison, Doug" <dharrison@...>
Subject: RE: Wonderboard PC interface original message!

Yes, we did get a little carried away with this one. I did manage to get
plenty of feedback, so much that I printed it into a big stack of paper
(more trees died) and took it home to read over the weekend. Thanks to all
who contributed.

I still have some more research to do before I commit to the final
specification. Perhaps I should clarify my goals, which have not changed.
The plan was to design a board with enough dummyproofing to use in
industrial applications yet simple enough to be inexpensive and quick to
build. I see the potential to use this board as an interface with several
parallel port step motor programs. However, CNCPro is the one program I
feel comfortable enough with to support for retrofits. That is the program
I am designing the board for. This is not meant to be a negative comment

on

other software and I would be happy to work with developers of such

programs

if they wish to communicate their wants and needs. The info I have on most
of them is inadequate to work with.


The preliminary specification looks like this:

1. Separate board - not in PC. ( I may change this again if I succeed in
solving the DC-DC converter issue. Shucks! I might even go both ways.)
2. All input and output lines optoisolated.
3. All optos socketed.
4. Selection of optos to allow interchangability between cheap and high
speed optos for step/direction lines.
5. Sockets for optional SS relays on control lines.
6. On board 5V power.
7. DB25 and screw term capable input - your choice
8. DB9 and screw term options for step/dir lines.
9. Screw terms for limits, e-stop and control outs.

Several of you noted that it should not be necessary to use optos to drive
the step/dir amp inputs because most drivers are already optoisolated.

Some

of them aren't. But the main reason I stuck to my guns here is that there
is a tendency (and I've seen it) to use the same 5V supply for the driver
optos as is used for the limit switches. The drivers are protected but the
parallel port is tied to the limit lines. Not good. The data out optos
will be supplied by the PC 5V supply. Yes, I know this means more than

just

a single cable from the PC - another argument for making the board fit into
a PCI/ISA slot.

Doug

-----Original Message-----
From: Dean Sala [SMTP:adsala@...]
Sent: Friday, February 25, 2000 8:25 PM
To: CAD_CAM_EDM_DRO@...
Subject: [CAD_CAM_EDM_DRO] Wonderboard PC interface original message!

From: "Dean Sala" <adsala@...>

It seems as though this thread has went off on a tangent. I originally
replied to Doug about a parrallel interface card that I had designed to
work with CNCpro. But it seemed to never appear on the message board
except in Doug's reply to it. The reply is in the "Interface Update"
thread. Anyway, It seems as though some of you are getting confused
between what Doug is proposing and what I have done. So I want to

clarify.

I designed an proto typed external interface card to work with CNCpro. I
am building a homebrew CNC system so my design is catered towards that. I
believe Doug has different requirements and is building a more robust
board catered towards industrial use. Am I right? I'm not completely
clear about his requirements yet. But this is what I wrote to him.


Here is my original message to the "Interface update" thread.

-------------------------------------------------------------------------

-

----------------------------------------------------
Doug,
It's real great that you are trying to resolve this problem. I

completely

agree that we need some sort of breakout box that could get us up to

speed

faster. With an on board 5vPS, relays, screw in terminals and such. It
just so happens that I have already designed a proto type of this board

to

work with CNCpro. Except that it does not use optoisolation on the
board.
I already have optoisolation on board my step drivers.

The proto type plugs into the parrallel port via cable. It has it's own
DB25 connector on one side and has a series of screw terminals on the
other.
It consists of a SN74S244 hex schmit trigger driver to drive the step and
direction data (3 or 4 axis or whatever)into the Step motor drivers. The
auxillary outputs, 3 in all so far (CNCPro at least) go through

ULN2003a's

(that can be parralleled for more current) to drive 1amp 5v relays.
Also,
the homing inputs are hooked up to IR switches with their own terminal
block. The other inputs are just tied high through 4.7ks. I am still
working on the design and am thinking about making it more universal for
other parrallel port NC programs that aren't as configurable as CNCpro.
But
first I'm keeping it simple. I'm sorry for not getting ideas from you
guys
but now I have a feeling what you want. Are you sure you need
optoisolation
on the board too? I can add them right to the output of the SN74S244 but
then the opto isolators would be driving opto isolators. Maybe I can put
a
switch selector to bypass opto isolation if the step drivers have them.

Possible enhancements: On board 5V power supply(otherwise supply external
5v
PS). Connectors to connect 120v to stepper power supply with fuses etc.
Diagnostic LEDs connected to various outputs. Connectors for main power
switch and power light. Oh, limit switch connectors tied to turn off
stepper PS. There you have it! All-in-one wonder board!

About using the parrallel port for drive LED's....you should sink them of
course but it's always better to put a buffer inline like an S series TTL
driver which can source 28ma and sink 64ma perfect for this situation,
more
noise resistant and just what their made for. This way you don't have to
worry about how much power the parallel port can provide.

Good luck
Dean

-------------------------------------------------------------------------

-

-------------------------------------------------------------

Please read Dougs reply in the "Interface Update" thread if you are
interested in his comments. It is a message stored under his name

If you have any questions about my design please reply. I left a few
things out of the above description.

Thanks
Dean Sala









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------------------------------------------------------------------------

Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
To Unsubscribe, read archives, change to or from digest.
Go to:
Log on, and you will go to Member Center, and you can make changes there.
For the FAQ, go to
bill,
List Manager

___________________________________________________________________________

____

___________________________________________________________________________

____

Message: 4
Date: Mon, 28 Feb 2000 15:48:51 -0500
From: "jguenthe" <jguenthe@...>
Subject: RE: Wonderboard PC interface original message!

Doug,

So what if it gets it's 5v supply from the PC and requires another cable.
It would seem to me that it could also get the 5v from a wall wort or some
other source besides the host PC, therefore my vote is for a separate board
and optional additional power supply. This way if space is a problem and
your host is a laptop, you could get the 5v from another source.

John Guenther

-----Original Message-----
From: Harrison, Doug [mailto:dharrison@...]
Sent: Monday, February 28, 2000 3:20 PM
To: 'CAD_CAM_EDM_DRO@...'
Subject: RE: [CAD_CAM_EDM_DRO] Wonderboard PC interface original message!

From: "Harrison, Doug" <dharrison@...>

Yes, we did get a little carried away with this one. I did manage to get
plenty of feedback, so much that I printed it into a big stack of paper
(more trees died) and took it home to read over the weekend. Thanks to all
who contributed.

I still have some more research to do before I commit to the final
specification. Perhaps I should clarify my goals, which have not changed.
The plan was to design a board with enough dummyproofing to use in
industrial applications yet simple enough to be inexpensive and quick to
build. I see the potential to use this board as an interface with several
parallel port step motor programs. However, CNCPro is the one program I
feel comfortable enough with to support for retrofits. That is the program
I am designing the board for. This is not meant to be a negative comment

on

other software and I would be happy to work with developers of such

programs

if they wish to communicate their wants and needs. The info I have on most
of them is inadequate to work with.


The preliminary specification looks like this:

1. Separate board - not in PC. ( I may change this again if I succeed in
solving the DC-DC converter issue. Shucks! I might even go both ways.)
2. All input and output lines optoisolated.
3. All optos socketed.
4. Selection of optos to allow interchangability between cheap and high
speed optos for step/direction lines.
5. Sockets for optional SS relays on control lines.
6. On board 5V power.
7. DB25 and screw term capable input - your choice
8. DB9 and screw term options for step/dir lines.
9. Screw terms for limits, e-stop and control outs.

Several of you noted that it should not be necessary to use optos to drive
the step/dir amp inputs because most drivers are already optoisolated.

Some

of them aren't. But the main reason I stuck to my guns here is that there
is a tendency (and I've seen it) to use the same 5V supply for the driver
optos as is used for the limit switches. The drivers are protected but the
parallel port is tied to the limit lines. Not good. The data out optos
will be supplied by the PC 5V supply. Yes, I know this means more than

just

a single cable from the PC - another argument for making the board fit into
a PCI/ISA slot.

Doug

-----Original Message-----
From: Dean Sala [SMTP:adsala@...]
Sent: Friday, February 25, 2000 8:25 PM
To: CAD_CAM_EDM_DRO@...
Subject: [CAD_CAM_EDM_DRO] Wonderboard PC interface original message!

From: "Dean Sala" <adsala@...>

It seems as though this thread has went off on a tangent. I originally
replied to Doug about a parrallel interface card that I had designed to
work with CNCpro. But it seemed to never appear on the message board
except in Doug's reply to it. The reply is in the "Interface Update"
thread. Anyway, It seems as though some of you are getting confused
between what Doug is proposing and what I have done. So I want to

clarify.

I designed an proto typed external interface card to work with CNCpro. I
am building a homebrew CNC system so my design is catered towards that. I
believe Doug has different requirements and is building a more robust
board catered towards industrial use. Am I right? I'm not completely
clear about his requirements yet. But this is what I wrote to him.


Here is my original message to the "Interface update" thread.

-------------------------------------------------------------------------

-

----------------------------------------------------
Doug,
It's real great that you are trying to resolve this problem. I

completely

agree that we need some sort of breakout box that could get us up to

speed

faster. With an on board 5vPS, relays, screw in terminals and such. It
just so happens that I have already designed a proto type of this board

to

work with CNCpro. Except that it does not use optoisolation on the
board.
I already have optoisolation on board my step drivers.

The proto type plugs into the parrallel port via cable. It has it's own
DB25 connector on one side and has a series of screw terminals on the
other.
It consists of a SN74S244 hex schmit trigger driver to drive the step and
direction data (3 or 4 axis or whatever)into the Step motor drivers. The
auxillary outputs, 3 in all so far (CNCPro at least) go through

ULN2003a's

(that can be parralleled for more current) to drive 1amp 5v relays.
Also,
the homing inputs are hooked up to IR switches with their own terminal
block. The other inputs are just tied high through 4.7ks. I am still
working on the design and am thinking about making it more universal for
other parrallel port NC programs that aren't as configurable as CNCpro.
But
first I'm keeping it simple. I'm sorry for not getting ideas from you
guys
but now I have a feeling what you want. Are you sure you need
optoisolation
on the board too? I can add them right to the output of the SN74S244 but
then the opto isolators would be driving opto isolators. Maybe I can put
a
switch selector to bypass opto isolation if the step drivers have them.

Possible enhancements: On board 5V power supply(otherwise supply external
5v
PS). Connectors to connect 120v to stepper power supply with fuses etc.
Diagnostic LEDs connected to various outputs. Connectors for main power
switch and power light. Oh, limit switch connectors tied to turn off
stepper PS. There you have it! All-in-one wonder board!

About using the parrallel port for drive LED's....you should sink them of
course but it's always better to put a buffer inline like an S series TTL
driver which can source 28ma and sink 64ma perfect for this situation,
more
noise resistant and just what their made for. This way you don't have to
worry about how much power the parallel port can provide.

Good luck
Dean

-------------------------------------------------------------------------

-

-------------------------------------------------------------

Please read Dougs reply in the "Interface Update" thread if you are
interested in his comments. It is a message stored under his name

If you have any questions about my design please reply. I left a few
things out of the above description.

Thanks
Dean Sala









------------------------------------------------------------------------
Shabang!com is the place to get your FREE eStore, Absolutely FREE
Forever. If you have any desires to sell your products or services
online, or you want to expand your customer base for FREE, Come check
out Shabang!com FREE eStores!

------------------------------------------------------------------------

Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
To Unsubscribe, read archives, change to or from digest.
Go to:
Log on, and you will go to Member Center, and you can make changes there.
For the FAQ, go to
bill,
List Manager

------------------------------------------------------------------------
GET A NEXTCARD VISA, in 30 seconds! Get rates
as low as 0.0% Intro APR and no hidden fees.
Apply NOW!

------------------------------------------------------------------------

Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
To Unsubscribe, read archives, change to or from digest.
Go to:
Log on, and you will go to Member Center, and you can make changes there.
For the FAQ, go to
bill,
List Manager





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Message: 5
Date: Mon, 28 Feb 2000 14:45:41 -0700 (MST)
From: "D.F.S." <dfs@...>
Subject: Re: re - Wonderboard PC interface

From: "Harrison, Doug" <dharrison@...>

Yes, we did get a little carried away with this one. I did manage to get
plenty of feedback, so much that I printed it into a big stack of paper
(more trees died) and took it home to read over the weekend. Thanks to

all

who contributed.

I still have some more research to do before I commit to the final
specification. Perhaps I should clarify my goals, which have not

changed.

The plan was to design a board with enough dummyproofing to use in
industrial applications yet simple enough to be inexpensive and quick to
build. I see the potential to use this board as an interface with

several

parallel port step motor programs. However, CNCPro is the one program I
feel comfortable enough with to support for retrofits. That is the

program

I am designing the board for. This is not meant to be a negative comment

on

other software and I would be happy to work with developers of such

programs

if they wish to communicate their wants and needs. The info I have on

most

of them is inadequate to work with.

Here is the design I threw together over the weekend.
It is not final, it is a starting point only.
There is some serious proofreading and checking to be done, but the basic
interface is all there.
I'm out of town this week.
I DO have the design and the free design package with me (Easy Trax)
The problem, is on my laptop, it can only run in 640X480 Mode and
That is only shown as about a 4" X 6" rectangle.
I'll be seriously limited in any REAL work on in.

I can generate Postscript files of the board.
I have no real way to generate an image given the current situation.
If anyone can convert it, and post is someplace everyone can see it.
let me know.

The preliminary specification looks like this:

1. Separate board - not in PC. ( I may change this again if I succeed

in

solving the DC-DC converter issue. Shucks! I might even go both ways.)

My board is external to allow lots of board space to add custom circuits.

2. All input and output lines optoisolated.

My design will use opto-isolators on the Board to PC interface.
The Board to device interface should probably have them where
damage is likely to happen as well.
I'll need about 20, about 11 outbound and 9 inbound to the PC.

3. All optos socketed.

I figured on socketing all the chips.

4. Selection of optos to allow interchangability between cheap and high
speed optos for step/direction lines.

The 17 Cent parts BG Micro has looked plenty fast for anythink you will
ever be able to spit out of a PC.

5. Sockets for optional SS relays on control lines.

I have PC mount Simgle pole Double throw Relays I planned to use.
I don't have sockets for them, but leaving holes for them along with
a big array of space to install them and wire them where appropriate
seems reasonable.
What do you mean by "SS" relay?

6. On board 5V power.

I figure the power and voltage requirements could vary tremendously
depending on what a person wanted to install as far as external
drive and interfaces.
110 or 220V are very likely to be used by some people.

I figured on running AC straight to the box, and installing a
surplus regulated power supply in the box, to leave all the options
open.
BG Micro, all electronics amd electronics goldmine all have a
good selection of regulated power supplies for under 10 bucks,
many are universal and can take anything from 90 - 250 Volts.

7. DB25 and screw term capable input - your choice

Mine has a 2 row 26 pin connector to the computer.
I have both 25 pin Din and 26 pin header connectors that simply crimp
on ribon cable.
Cut the cable to length and crimp the ends on.

Of course everyone has the option to crimp whatever type of connector
they want on the other end, even if it only extends to a connector
mounted on the outside of the case.

For the IO ports, I suggest dual connectors designed onto the board
and people can install the type they want. Ie. a standard header, and
holes to mount whatever readily avalible type of screw connector
we select.
I DO have some, but they are big, they take crim on spade type
connectors. There are 3 lugs on each pin, they are held down
by a screw, you could always remove the screw, toss the spades and
connect the wire to the screw.

8. DB9 and screw term options for step/dir lines.

Good idea, both designed onto the board, install whatever you want.

9. Screw terms for limits, e-stop and control outs.

Same as above.

Several of you noted that it should not be necessary to use optos to

drive

the step/dir amp inputs because most drivers are already optoisolated.

Some

of them aren't. But the main reason I stuck to my guns here is that

there

is a tendency (and I've seen it) to use the same 5V supply for the driver
optos as is used for the limit switches. The drivers are protected but

the

parallel port is tied to the limit lines. Not good. The data out optos
will be supplied by the PC 5V supply. Yes, I know this means more than

just

a single cable from the PC - another argument for making the board fit

into

a PCI/ISA slot.

My design would isolate all the PC lines at the point the enter from
and exit to the PC. That should protect the PC.
People could then isolate whatever IO From they board they considered
necessart to protect the "Wonderboard".

I would just as soon keep the board outside of the PC case.

The ISA board will now work with Laptops, Microchannel PCs and many
people would be afraid to install it inside the case anyway.

All the Status and Diagnostic LEDs I have designed in, are mounted
on the board itself. They would need to be run outside the PC and be
mounted in a project case of some sort.

Marc
BTW. we are still under 10 bucks in parts.
Granted, additions will add to that cost, but the basic board is under
10, plus a power supply, and whatever case people want.



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Message: 6
Date: Mon, 28 Feb 2000 23:56:43 -0000
From: "Terry May" <tmay@...>
Subject: RE: DRO UPDATE

Art,
Just wanted to tell I have been looking at your website, great
pictures!! It really helps to visualize your setup as you have been
discribing it on the list. I hope my DRO turns out to be half as good
as yours.
Just a quick update from my shop, I didn't have any 7414's or the
decrete transistors that Steve Linsay used on my bench so I just
played around a bit. Hooked up the encoders to my scope and checked
out the waveform and then used a freq counter to do the same. All the
encoders look like they are working fine so after work tomorrow I
will pickup some chips at Radio Shack and put together a board.
Concerning the discussions about wires/cables for the setup, I have
lots of good parts left over from a dearly departed HP plotter.
Amoung the goodies are all the wires used to move the pen holder, I
think they will be long enough for the Y and Z axis' of my mill/drill
if not the x axis.
As I was playing with the encoder still hooked to the motor and
reading it with the freq counter, I realized that just one channel
out of a 1000 line encoder is a very nice division factor for a
tach????. I think I will experiment with that a little also.
Thanks again for sharing your experiences and your website!
Terry May



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Message: 7
Date: Mon, 28 Feb 2000 18:59:48 -0500
From: Charles Gallo <Charlie@...>
Subject: Feedback wanted

Hi,
I was just wondering is anyone has gotten a chance to look at Stepster
Build 11?


Charlie

-->
RKBA!
PGP Fingerprint: 7218 67D7 54B8 EFAF 67B7 4FED 7AC5 3687 492C 7382
PGP Key at



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Message: 8
Date: Mon, 28 Feb 2000 19:31:06 -0500
From: "A. G. Eckstein" <axtein@...>
Subject: Re: RE: DRO UPDATE

Terry,
Thanks for the words of encouragement. I need that and hope my little bit
will help. I appreciate all the words that I have gotten on the site and as
things progress, will try to update it. My long term goal is to get to the
magical resolution of 0.0001"
Actually, when I started the goal was to get accuracy to 0.001" with no
backlash. I have far exceeded that but now it is a challange.

Please let me know if I can help further.

Art

At 11:56 PM 02/28/2000 -0000, you wrote:

From: "Terry May" <tmay@...>

Art,
Just wanted to tell I have been looking at your website, great
pictures!! It really helps to visualize your setup as you have been
discribing it on the list. I hope my DRO turns out to be half as good
as yours.
Just a quick update from my shop, I didn't have any 7414's or the
decrete transistors that Steve Linsay used on my bench so I just
played around a bit. Hooked up the encoders to my scope and checked
out the waveform and then used a freq counter to do the same. All the
encoders look like they are working fine so after work tomorrow I
will pickup some chips at Radio Shack and put together a board.
Concerning the discussions about wires/cables for the setup, I have
lots of good parts left over from a dearly departed HP plotter.
Amoung the goodies are all the wires used to move the pen holder, I
think they will be long enough for the Y and Z axis' of my mill/drill
if not the x axis.
As I was playing with the encoder still hooked to the motor and
reading it with the freq counter, I realized that just one channel
out of a 1000 line encoder is a very nice division factor for a
tach????. I think I will experiment with that a little also.
Thanks again for sharing your experiences and your website!
Terry May

OLDER THAN DIRT

Country Bubba

(Actually the inventor of Country and Bubba)



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Message: 9
Date: Mon, 28 Feb 2000 20:53:13 -0500
From: Charles Hopkins <chopkins@...>
Subject: DRO

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

Thanks

Charles Hopkins



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Message: 10
Date: Mon, 28 Feb 2000 19:09:58 -0700
From: "Tim Goldstein" <timg@...>
Subject: Re: DRO

Try

Tim
[Denver, CO]

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

Thanks

Charles Hopkins

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Message: 11
Date: Mon, 28 Feb 2000 22:13:20 -0500
From: "Jim Geib" <jimg47@...>
Subject: Re: DRO


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



Jim Geib
Mansfield, Ohio
----- Original Message -----
From: "Charles Hopkins" <chopkins@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: Monday, February 28, 2000 8:53 PM
Subject: [CAD_CAM_EDM_DRO] DRO

From: Charles Hopkins <chopkins@...>

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

Thanks

Charles Hopkins


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Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

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Message: 12
Date: Mon, 28 Feb 2000 22:27:55 -0500
From: "Multi-Volti Devices" <multi-volti@...>
Subject: For sale: two used Superior Electric 840 oz-in steppers

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



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Message: 13
Date: Tue, 29 Feb 2000 04:21:12 EST
From: ptengin@...
Subject: Re: re - Wonderboard PC interface

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.


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Message: 14
Date: Tue, 29 Feb 2000 04:26:17 EST
From: ptengin@...
Subject: Re: For sale: two used Superior Electric 840 oz-in steppers

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.


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Message: 15
Date: Tue, 29 Feb 2000 10:57:17 -0000
From: "Peter Smith" <peter@...>
Subject: Re: is my software stable?


----- Original Message -----
From: Joe Vicars <jvicars@...>
To: <CAD_CAM_EDM_DRO@...>
Sent: 25 February 2000 20:31
Subject: [CAD_CAM_EDM_DRO] is my software stable?

Hello Joe
I to have just started using DeskNC and G codes, and noticed an odd effect
with the programing, in the two examples below, the first one does not run
correctly, i.e. when the motors are decelerating almost to a stop, there
seems to be a kick just as the motor stops ( all axis, lost steps), this
does not happen in the second one where G90 X0.0 Y0.0 Z0.0 are on the same
line, I have also noticed that comments in the file sometimes cause a
similar problem.
Has anyone had this problem before ?

G90
G00 X 0.0 Y0.0 Z0.0
G00 X1.8 Y1.8 Z-1.8
G00 X0.0 Y0.0 Z0.0
M02

G90 X0.0 Y0.0 Z0.0
G00 X1.8 Y1.8 Z-1.8
G00 X0.0 Y0.0 Z0.0
M02

Best Wishes
Peter Smith

From: Joe Vicars <jvicars@...>

I am running desknc from a 486 DOS only machine. So far everything
works great, but the longest program I have run is less than 30 seconds
total. Eventually I want to run more complicated paths, and much longer
execute times. Am I going to run into stability problems from the
software?


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Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems in the above catagories.

To Unsubscribe, read archives, change to or from digest.
Go to:
Log on, and you will go to Member Center, and you can make changes there.
For the FAQ, go to
bill,
List Manager

___________________________________________________________________________

____

___________________________________________________________________________

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