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'[AD:] (will be) Small CNC mill, controller and sof'
2004\07\20@193054 by Jack Smith

picon face
Sherline's mill with numerical readout uses a simple backlash offset
adjustment.

The lead screws are 1/4-20 precision rolled with a two-nut arrangement for
backlash adjustment. However, it's not possible to adjust for zero backlash
and still have the leadscrew turn with reasonable torque. Typically I find
.002 or .003 inches backlash when adjusted for smooth turning.

Sherline's digital display counts leadscrew turns and converts those to
X/Y/Z values, with a step size of 0.0005 inch.

You program in the backlash value, in steps of 0.0005 inches. This backlash
value is assumed to be constant over the X and Y travel and is just
subtracted when cranking the leadscrew. (Of course, you enter separate
backlash constants for X, Y and Z.)

The system works better than one might think. However, the Shooting Star DRO
on my "real" milling machine is a better arrangement, as it reads
displacement directly, without regard to backlash. (Well, actually there's
likely a bit of backlash inherent in the rack/pinion system Shooting Star
uses, but in practice, it's well within its rated accuracy from what I've
been able to measure.)

Sherline has a great deal of information on its web site concerning its
products. http://www.sherline.com.


Jack

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2004\07\20@203815 by Spehro Pefhany

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At 07:31 PM 7/20/2004 -0400, you wrote:


>The system works better than one might think. However, the Shooting Star DRO
>on my "real" milling machine is a better arrangement, as it reads
>displacement directly, without regard to backlash. (Well, actually there's
>likely a bit of backlash inherent in the rack/pinion system Shooting Star
>uses, but in practice, it's well within its rated accuracy from what I've
>been able to measure.)

Shooting Star claim NO backlash. There is no backlash inherent in a
geared system IF it is preloaded and if the spring force is not exceeded by
any other forces.

That's how the ballscrews in real CNC machines work- they are "preloaded"
with a powerful spring to a force higher than the biggest cut you'll ever
take so that there is NO backlash. Since there is little force involved
in running the DRO encoder, the little leaf spring does the same thing
for the pinion on your machine.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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'[AD:] (will be) Small CNC mill, controller and sof'
2004\08\24@142657 by James Newton
face picon face
source= http://www.piclist.com/piclist/2004/08/22/034635a.txt?

Philip Stortz  says:
> i'd like to build a microcontroller based interface that
> coordinates the axes and just takes motion commands like
> someone else on the list mentioned, freeing the computer and
> allowing better control/interpolation.  
>
The new quickstepper controller I'm getting ready to release is exactly that. It avoids depending on the PC for the timing of step and direction pulses and instead accepts path commands which it then uses to ramp and drive the motors as cleanly as possible from point A to point B.
I have beta test units available now as kits for qualified users at about $30 but the final unit will be sold assembled and tested, plug and play, ready to go.

http://www.quickstepper.com

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2004\08\24@151233 by Larry Green

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face
Subject: Re: [AD:] (will be) Small CNC mill, controller and software for ~$500


source= http://www.piclist.com/piclist/2004/08/22/034635a.txt?

Philip Stortz  says:
>> i'd like to build a microcontroller based interface that
>> coordinates the axes and just takes motion commands like
>> someone else on the list mentioned, freeing the computer and
>> allowing better control/interpolation.
>>
>
> The new quickstepper controller I'm getting ready to release is exactly that.
It avoids depending on the PC for the timing of step and direction > pulses and
instead accepts path commands which it then uses to ramp and drive the motors as
cleanly as possible from point A to point B.

> I have beta test units available now as kits for qualified users at about $30
but the final unit will be sold assembled and tested, plug and
> play, ready to go.

James, are you saying this unit will be independant of a PC or will be an
interface between the PC and the CNC machine like most other controllers out
there?

I am about to start building a low cost CNC mill/router/engraver and I am still
looking for a suitable interface to drive the steppers.

Will your controller accept industry standard G code files (or at least the step
and direction info from G code control software) or is it designed more for
Epsilon, Gerber or HPGL type files?

Is it going to connect to the parallel port or the serial port? Most of the CNC
software I have found seems to be based on the printer port (at least when
interfacing with a control board).

Larry Green

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2004\08\24@170008 by Howard Winter

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flavicon
picon face
Larry,

On Tue, 24 Aug 2004 15:17:11 -0400, Larry Green wrote:

>...<
> Is it going to connect to the parallel port or the
serial port? Most of the CNC
> software I have found seems to be based on the printer
port (at least when
> interfacing with a control board).

Looking at the far-left of the top photo on James' site,
it says "5V-level serial" so it looks like it needs an
RS232 level converter (MAX232 or whatever) to connect to
a PC serial port.

Cheers,


Howard Winter
St.Albans, England

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2004\08\24@170708 by Larry Green

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face
> Larry,
>
> On Tue, 24 Aug 2004 15:17:11 -0400, Larry Green wrote:
>
> >...<
> > Is it going to connect to the parallel port or the
> serial port? Most of the CNC
> > software I have found seems to be based on the printer
> port (at least when
> > interfacing with a control board).
>
> Looking at the far-left of the top photo on James' site,
> it says "5V-level serial" so it looks like it needs an
> RS232 level converter (MAX232 or whatever) to connect to
> a PC serial port.
>

Thanks, I spotted that when I looked at the photos again *after* hitting
send.......... DOH!

Larry Green

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2004\08\24@200321 by Victor Faria

picon face
Looks good !
But  bipolar ,unipolar,amps,max voltage??
Also price once released?
thanks
Victor

----- Original Message -----
From: "James Newton" <jamesnewtonspamKILLspamPICLIST.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Tuesday, August 24, 2004 2:34 PM
Subject: Re: [AD:] (will be) Small CNC mill, controller and software for
~$500


source= http://www.piclist.com/piclist/2004/08/22/034635a.txt?

Philip Stortz  says:
> i'd like to build a microcontroller based interface that
> coordinates the axes and just takes motion commands like
> someone else on the list mentioned, freeing the computer and
> allowing better control/interpolation.
>

The new quickstepper controller I'm getting ready to release is exactly
that. It avoids depending on the PC for the timing of step and direction
pulses and instead accepts path commands which it then uses to ramp and
drive the motors as cleanly as possible from point A to point B.

I have beta test units available now as kits for qualified users at about
$30 but the final unit will be sold assembled and tested, plug and play,
ready to go.

http://www.quickstepper.com

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EraseMEjamesnewtonspam_OUTspamTakeThisOuTpiclist.com  1-619-652-0593 phone
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2004\08\24@204302 by James Newton

face picon face
source= http://www.piclist.com/piclist/2004/08/24/151233a.txt?

Larry Green  says:
> James, are you saying this unit will be independant of a PC
> or will be an interface between the PC and the CNC machine
> like most other controllers out there?
>
An interface.



Larry Green  says:
> Will your controller accept industry standard G code files
> (or at least the step and direction info from G code control
> software) or is it designed more for Epsilon, Gerber or HPGL
> type files?
>
HPGL and Eagle board files at this point.

Larry Green  says:
> Is it going to connect to the parallel port or the serial
> port? Most of the CNC software I have found seems to be based
> on the printer port (at least when interfacing with a control
> board).
>
Seral port. I'm not going for a "standard" device. I want to be less host dependant, e.g. run HPGL files from your PALM Pilot if you want. One of the uses I'm looking at is a more portable system that can be taken to point of sale and used to make custom art, etc.. on the spot. And, as anyone who has tried knows, USB to parallel adapters suck but USB to serial units actually work sometimes.

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2004\08\25@092849 by Alan B. Pearce

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Just had a new CPC catalogue arrive on a colleagues desk here in the UK, and
while browsing through it, in the PCB consumables section is a "Low Cost CNC
Kit" for GBP256.02, catalogue #PC00380. It does require a Minicraft Drill
model MB150 (CPC # TL-MB150)

Don't know if this is also available in the USA, but it sure would come
inside the US$500. Might be too light weight for what is envisaged, but for
the price is probably about as good as you can get.

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2004\08\25@101513 by Dominic Stratten

picon face
That sounds suspiciously like the Milford Instruments 3 axis machine shown
here :

http://www.milinst.com/robotics/robotics.htm#axis

I've always fancied one but have decided to build one from scratch sometime
in the next 25 years to save a few pennies ;)

Dom

{Original Message removed}

2004\08\25@103210 by Alan B. Pearce

face picon face
>That sounds suspiciously like the Milford Instruments
>3 axis machine shown here :
>
>http://www.milinst.com/robotics/robotics.htm#axis
>
>I've always fancied one but have decided to build one
>from scratch sometime in the next 25 years to save a
>few pennies ;)

The picture certainly looks the same. But at the price CPC have for it, I
doubt it is worth trying to do your own, unless you already have some pretty
heavy duty machining facilities available.

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2004\08\25@105536 by Dominic Stratten

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I used to work for a small precision bearings manufacturing company and one
of the projects I worked on was a giant 3 axis machine with an Elu Moffet
(spelling) 1kw router on the top. It was that rigid (and powerful) it could
carry an adult on the Z Axis and still be pretty accurate.
Always wanted one after watching it draw pictures on a 5 foot square piece
of paper with a felt tip pen :-)

We had some scarey monents with it though. When a controller unit or
feedback unit failled it would decide to come bombing towards you at 3
meters per second. This may not seem much but it had enough momentum to
topple half a ton of machine towards you if it wasn’t bolted down to the
floor.

One day I'll build a mini version. I just need more space, funds and time
lol.

Dom        

{Original Message removed}

2004\08\25@122904 by hael Rigby-Jones

picon face
{Quote hidden}

Details online at
custom1.farnell.com/cpc/product.asp?catalog%5Fname=cpc+catalogue&prod
uct%5Fid=PC0038066

No pictures unfortunately.

Regards

Mike


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2004\08\25@162426 by steve

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> >Just had a new CPC catalogue arrive on a colleagues desk here
> >in the UK, and while browsing through it, in the PCB
> >consumables section is a "Low Cost CNC Kit" for GBP256.02,
> >catalogue #PC00380. It does require a Minicraft Drill model
> >MB150 (CPC # TL-MB150)

> No pictures unfortunately.

But the top line does say "Low Cost CNC Kit Milford Instruments".

Steve

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2004\08\25@224735 by hilip Stortz

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but will it do circles?  will it coordinate all 3 axis or 3+ axis?  will
it do ovals?  will it be aware of tool size and tool offsets?  that's
what i want.  i'd also like to be able to do a combination of manual and
computer controlled milling, i.e. manually move the mill to a point and
then tell it to make a circle/oval/rectangular cut or pocket and be
smart enough to know which tool is in the mill or ask me to put in the
bit(s) it wants.  yeah, i know, i want a lot.

James Newton wrote:
{Quote hidden}

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