[EMAIL PROTECTED] wrote:
>
> I do wonder how accurate the positioning is for a 50 foot table
> and how repeatable the positioning would be after a long move.
>
> That would still be one impressive machine.
Well, this machine was supposed to have a 50 foot glass scale.
Depending on the architectur
e.net
Subject
Re: [Emc-users] DRO input?
02/01/2008 11:12
lled using its own feedback.
- Original Message -
From: "Kirk Wallace" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)"
Sent: Saturday, February 02, 2008 5:29 PM
Subject: Re: [Emc-users] DRO input
> On Sat, 2008-02-02 at 15:05 -0500, John Kasun
On Sat, 2008-02-02 at 11:57 +, [EMAIL PROTECTED] wrote:
... snip
> a/ DRO (with pukka glass scales) is a huge boon to any manual mill.
Agreed. I write all my way-points with a sharpie on the vise or table
before hand so, I don't know what I would do without a DRO of some sort.
> b/ A DRO coul
On Sat, 2008-02-02 at 15:05 -0500, John Kasunich wrote:
> Jon Elson wrote:
> > [EMAIL PROTECTED] wrote:
> >
> >> i/ I guess this is going to come down to a philosophical choice, do you
> >> pursue the DRO first, or the EMC + NC first? vi vs emacs anyone?
> > If you are going to the trouble and exp
Jon Elson wrote:
> [EMAIL PROTECTED] wrote:
>
>> i/ I guess this is going to come down to a philosophical choice, do you
>> pursue the DRO first, or the EMC + NC first? vi vs emacs anyone?
> If you are going to the trouble and expense of embarking on one
> of these paths, then the CNC path is the
John Thornton wrote:
> I just wonder why you want to put such a nice DRO on a worn out old manual
> mill
> that needs the ways scraped and the screws are worn out?
Hate to argue, but the differential wear in the screws makes it
totally impossible to make anything with better than 1/8"
accuracy
[EMAIL PROTECTED] wrote:
> i/ I guess this is going to come down to a philosophical choice, do you
> pursue the DRO first, or the EMC + NC first? vi vs emacs anyone?
If you are going to the trouble and expense of embarking on one
of these paths, then the CNC path is the most reward for your
effo
drivers are free to (and probably should) keep encoder counts in 'long
long's. This way, the exported count may wrap at 2^31-1 (limit of
signed 32-bit ints) but the exported position can continue to increase
to 2^63-1 counts.
Jeff
-
I just wonder why you want to put such a nice DRO on a worn out old manual mill
that needs the ways scraped and the screws are worn out? You will not be able
to
make an accurate part to the abilities of your DRO if the table won't stay
where you
put it and your Z is always changing because you
to
> [EMAIL PROTECTED]
>
> You can reach the person managing the list at
> [EMAIL PROTECTED]
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Emc-users digest..."
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&
Kirk,
That's not my website on the DRO's I just built a couple from there and they
work well.
John
On 1 Feb 2008 at 16:34, [EMAIL PROTECTED] wrote:
> That's a nice setup DRO system and website you have. I was fishing for
> a reason to have a serial micrometer connected to EMC for a reason
> oth
On Feb 1, 2008, at 8:12 PM, Jon Elson wrote:
[EMAIL PROTECTED] wrote:
Yep! Wilson machine bought a 50' x 4' CMM at a Boeing auction.
Got it
cheap and spent a million moving it and
getting it set up again. And that was only a few miles.
Holy COW! a 50 FOOT CMM? There must only be 2 or 3
[EMAIL PROTECTED] wrote:
>>>Yep! Wilson machine bought a 50' x 4' CMM at a Boeing auction. Got it
>>>cheap and spent a million moving it and
>>>getting it set up again. And that was only a few miles.
>>
>>Holy COW! a 50 FOOT CMM? There must only be 2 or 3 in the
>>entire US that big. (I can und
On Fri, 2008-02-01 at 23:19 +0100, Anders Blix wrote:
> I have a different idea.
>
> Why not tap in to the signal from the encoders themselves? If this is glass
> scales with proper quadrature output it should be simple to read this
> signals by a cheap card? There is nothing that says the quadrat
(EMC)
> Subject: Re: [Emc-users] DRO Input?
>
>
> Dave.
>
> I would say all the advice given to you is sort of a shot in the dark-
> until you tell us your intentions with your equipment. Of course what you
> do with the advice is up to you.
> As far EMC and se
>>
>> Yep! Wilson machine bought a 50' x 4' CMM at a Boeing auction. Got it
>> cheap and spent a million moving it and
>> getting it set up again. And that was only a few miles.
>Holy COW! a 50 FOOT CMM? There must only be 2 or 3 in the
>entire US that big. (I can understand why Boeing would ne
RogerN wrote:
> Would it be difficult to update the actual position with the position
> from the linear encoders? The DRO position would just stomp on the
> actual position. Hopefully most of the time the error would be small
> and it would require real time DRO position... or perhaps only ass
RogerN wrote:
> Would it be difficult to update the actual position with the position
> from the linear encoders? The DRO position would just stomp on the
> actual position. Hopefully most of the time the error would be small
> and it would require real time DRO position... or perhaps only ass
[EMAIL PROTECTED] wrote:
> but... sticking an encoder on an axis is not measuring the position of
> anything except the leadscrew, it takes no account whatsoever of backlash,
> uneven wear or pitch errors.
>
> To a certain extent you can map out backlash and areas of wear on a
> leadscrew, but le
Dave Engvall wrote:
>
> Yep! Wilson machine bought a 50' x 4' CMM at a Boeing auction. Got it
> cheap and spent a million moving it and
> getting it set up again. And that was only a few miles.
Holy COW! a 50 FOOT CMM? There must only be 2 or 3 in the
entire US that big. (I can understand w
On Fri, 2008-02-01 at 06:03 -0600, John Thornton wrote:
> That is how my DRO's work that I built for my mill and lathe.
>
> http://www.shumatech.com/
>
> John
> On 31 Jan 2008 at 18:04, [EMAIL PROTECTED] wrote:
>
> > Another thought, is there any value in having an RS-232 connection
> > with ser
That would depend on the accuracy of your scales... .4" precision
(.001mm)is
not cheap...
In my case mine are not nearly that accurate...
I guess it depends on how much accuracy is needed and the future of the machine.
EMC does have screw mapping...
John
On 1 Feb 2008 at 4:04, [EMAIL PRO
That is how my DRO's work that I built for my mill and lathe.
http://www.shumatech.com/
John
On 31 Jan 2008 at 18:04, [EMAIL PROTECTED] wrote:
> Another thought, is there any value in having an RS-232 connection
> with serial calipers or micrometers?
--
when the axis is moving very slow or stopped.
- Original Message -
From: <[EMAIL PROTECTED]>
To:
Sent: Friday, February 01, 2008 4:07 AM
Subject: Re: [Emc-users] DRO Input?
>
>> Message: 9
>> Date: Thu, 31 Jan 2008 13:36:51 -0800
>> From: Dave Engvall <[EM
> Date: Fri, 1 Feb 2008 10:07:32 +
> From: [EMAIL PROTECTED]
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] DRO Input?
>
>
>> Message: 9
>> Date: Thu, 31 Jan 2008 13:36:51 -0800
>> From: Dave Engvall
>> Subject: Re: [Emc-users]
> Message: 9
> Date: Thu, 31 Jan 2008 13:36:51 -0800
> From: Dave Engvall <[EMAIL PROTECTED]>
> Subject: Re: [Emc-users] DRO input?
>
> Hi Dave,
>
> It all depends on what you want to do. If you just want manual
> position then the glass scales will do your job
On Jan 31, 2008, at 6:01 PM, Jon Elson wrote:
> Kirk Wallace wrote:
>> On Thu, 2008-01-31 at 12:54 -0800, Kirk Wallace wrote:
>> ... snip
>>
>>> In thinking about scales again, one thought that came to mind is,
>>> EMC
>>> might make a good CMM (manual or powered). But I guess the real
>>> ma
Kirk Wallace wrote:
> On Thu, 2008-01-31 at 12:54 -0800, Kirk Wallace wrote:
> ... snip
>
>>In thinking about scales again, one thought that came to mind is, EMC
>>might make a good CMM (manual or powered). But I guess the real magic is
>>in the granite slides, though errors could be mapped out. W
Hi Dave,
It all depends on what you want to do. If you just want manual
position then the glass scales will do your job.
However, if you ever intend to control the axes then encoders mounted
on the end of the ball screws would be my choice. USdigital or
Automation Direct (Koyo) encoders are
On Thu, 2008-01-31 at 12:54 -0800, Kirk Wallace wrote:
... snip
> In thinking about scales again, one thought that came to mind is, EMC
> might make a good CMM (manual or powered). But I guess the real magic is
> in the granite slides, though errors could be mapped out. Which brings
> me back to th
On Thu, 2008-01-31 at 11:04 -0600, Jeff Epler wrote:
> emc2 doesn't include any "serial protocol" drivers. You would have to
> write the driver to do this yourself.
>
> The most important thing to know is that emc2 requires a new feedback
> position at the servo rate (typically 1ms) and emc (not
[EMAIL PROTECTED] wrote:
> Sorry, haven't RTFM, downloading as I type.
>
> I'm considering buying a Far Eastern made 3 axis DRO for my Pinnacle
> universal mill, DRO + 3 glass scales (to 1/5thou") and all cabling etc etc
> for under 400 UK Pounds.
>
> This DRO has an RS232 output.
>
> So, does E
emc2 doesn't include any "serial protocol" drivers. You would have to
write the driver to do this yourself.
The most important thing to know is that emc2 requires a new feedback
position at the servo rate (typically 1ms) and emc (not external
hardware) has to control when the feedback position is
Sorry, haven't RTFM, downloading as I type.
I'm considering buying a Far Eastern made 3 axis DRO for my Pinnacle
universal mill, DRO + 3 glass scales (to 1/5thou") and all cabling etc etc
for under 400 UK Pounds.
This DRO has an RS232 output.
So, does EMC have the facility to take absolute X Y Z
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