While I can see the need (sometimes) for a durable metal encoder
disc, and I have cut some out of .016" copper (was on hand, and never
got tested), I wonder how useful, or how durable laser printed
transparency film would be for many applications. Two of them glued
back to back with the pri
I just found this website:
http://www.photofab.co.uk/index.php/products/optical-encoder-discs-and-actuators/
I don't know what the pricing would be like, but that could be a
perfect way to add a spindle encoder, if combined with
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=get
On 2 June 2012 15:21, cogoman wrote:
> While I can see the need (sometimes) for a durable metal encoder
> disc, and I have cut some out of .016" copper (was on hand, and never
> got tested), I wonder how useful, or how durable laser printed
> transparency film would be for many applications.
It
On Saturday, June 02, 2012 12:45:30 PM cogoman did opine:
>While I can see the need (sometimes) for a durable metal encoder
> disc, and I have cut some out of .016" copper (was on hand, and never
> got tested), I wonder how useful, or how durable laser printed
> transparency film would be for
ve a PID controlled motor, USB port,
programmable current limit for torque control and also scalable in the
future for 3-phase brushless DC.
Dennis
> ---Original Message---
> From: andy pugh
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Encoder discs
>
rolled motor, USB port,
> programmable current limit for torque control and also scalable in the
> future for 3-phase brushless DC.
>
>
> Dennis
>
>
> > ---Original Message---
> > From: andy pugh
> > To: Enhanced Machine Controller (EMC)
> > Sub
On Sat, 2 Jun 2012, Joseph Chiu wrote:
> Date: Sat, 2 Jun 2012 11:56:26 -0700
> From: Joseph Chiu
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: ceen...@in-front.com,
> "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users]
On Saturday, June 02, 2012 03:49:49 PM cogoman did opine:
>While I can see the need (sometimes) for a durable metal encoder
> disc, and I have cut some out of .016" copper (was on hand, and never
> got tested), I wonder how useful, or how durable laser printed
> transparency film would be for
On 2 June 2012 18:28, wrote:
> Avago AEDR-8300-1K1 quadrature encoder module.
That is the sensor I am using.
> It's nice to hear that laser printed wheels cannot be "seen" with this type
> of sensor. I'm going under the assumption that the fiberglass between the
> gold traces is not reflectiv
The eps file is vector graphics, it can generate as fine detail as
you need.
When I used GIMP to output to .JPG I got very good resolution, but I
had to ask for it.
Try this:
1. Right click on the .eps file.
2. Click on "Open with".
3. Click on GIMP.
4. The dialog "Import from PostScr
On 06/02/2012 04:27 PM, cogoman wrote:
> The eps file is vector graphics, it can generate as fine detail as
> you need.
One thing I forgot to mention, with this technique, your printer's
resolution is the limiting factor, and with modern printers, it's
usually not very limiting at their highe
I reworked the postscript program so you can specify encoder wheel size,
and index pulse width for an encoder, then you can call the subroutine
(done twice at the bottom) at different places on the paper.
Hopefully the instructions in another message for using GIMP can get
you the resolution
On Saturday, June 02, 2012 08:41:49 PM cogoman did opine:
>The eps file is vector graphics, it can generate as fine detail as
> you need.
>
>When I used GIMP to output to .JPG I got very good resolution, but I
> had to ask for it.
> Try this:
>
> 1. Right click on the .eps file.
> 2. C
cogoman wrote:
> I reworked the postscript program so you can specify encoder wheel size,
>
Very cool, thanks!
Jon
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
On Sunday, June 03, 2012 10:37:11 AM cogoman did opine:
> I reworked the postscript program so you can specify encoder wheel size,
> and index pulse width for an encoder, then you can call the subroutine
> (done twice at the bottom) at different places on the paper.
>Hopefully the instructions
On Sun, 3 Jun 2012 11:39:30 -0400
gene heskett wrote:
> On Sunday, June 03, 2012 10:37:11 AM cogoman did opine:
>
> > I reworked the postscript program so you can specify encoder wheel
> > size, and index pulse width for an encoder, then you can call the
> > subroutine (done twice at the bottom)
On Sunday, June 03, 2012 03:06:54 PM dave did opine:
> On Sun, 3 Jun 2012 11:39:30 -0400
>
> gene heskett wrote:
> > On Sunday, June 03, 2012 10:37:11 AM cogoman did opine:
> > > I reworked the postscript program so you can specify encoder wheel
> > > size, and index pulse width for an encoder,
On 3 June 2012 16:39, gene heskett wrote:
> But its duty cycle was
> about 57 on to 43 off,
I don't think duty cycle is all that important, unless it drifts far
enough to break the quadrature.
If you use analogue-output sensors with comparators to square them up,
then you can change the thresh
On Sun, 3 Jun 2012, andy pugh wrote:
Date: Sun, 3 Jun 2012 21:03:18 +0100
From: andy pugh
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] Encoder discs
On 3 June 2012 16:39, gene heskett wrote:
Bu
On Sunday, June 03, 2012 08:11:48 PM andy pugh did opine:
> On 3 June 2012 16:39, gene heskett wrote:
> > But its duty cycle was
> > about 57 on to 43 off,
>
> I don't think duty cycle is all that important, unless it drifts far
> enough to break the quadrature.
>
> If you use analogue-output
gene heskett wrote:
> On Sunday, June 03, 2012 03:06:54 PM dave did opine:
>
>
>> Any chance of collimating the LED's by putting a slit in front of them?
>>
>>
> Placing the slit would be an exercise in precision I haven't mastered.
I got a nearly lifetime supply of beam-break sensors out o
On Monday, June 04, 2012 02:01:32 AM Jon Elson did opine:
> gene heskett wrote:
> > On Sunday, June 03, 2012 03:06:54 PM dave did opine:
> >> Any chance of collimating the LED's by putting a slit in front of
> >> them?
> >
> > Placing the slit would be an exercise in precision I haven't mastered.
On 06/03/2012 11:39 AM, gene heskett wrote:
> As for the various methods of blackening brass, discussed here previously,
> most were butt ugly, giving all the colors of a good skin bruise rather
> than a nice flat black. I believe that was because of my inability to get
> all the cutting oil was
On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine:
> On 06/03/2012 11:39 AM, gene heskett wrote:
>
>
>
> > As for the various methods of blackening brass, discussed here
> > previously, most were butt ugly, giving all the colors of a good skin
> > bruise rather than a nice flat black.
On 06/04/2012 06:39 AM, gene heskett wrote:
> On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine:
>
>
>> On 06/03/2012 11:39 AM, gene heskett wrote:
>>
>>
>>
>>
>>> As for the various methods of blackening brass, discussed here
>>> previously, most were butt ugly, giving all the c
On 4 June 2012 07:26, gene heskett wrote:
> It is extremely sensitive to this bit of timing variation caused
> by a nominally 5 thou non concentricity in the way it is mounted (I believe
> because the center hole in the disk is slightly undersized, forcing one
> side of the hole to be pulled into
On Monday, June 04, 2012 07:49:47 AM Mark Wendt did opine:
> On 06/04/2012 06:39 AM, gene heskett wrote:
> > On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine:
> >> On 06/03/2012 11:39 AM, gene heskett wrote:
> >>
> >>
> >>
> >>> As for the various methods of blackening brass, discussed
On Monday, June 04, 2012 08:01:51 AM andy pugh did opine:
> On 4 June 2012 07:26, gene heskett wrote:
> > It is extremely sensitive to this bit of timing variation caused
> > by a nominally 5 thou non concentricity in the way it is mounted (I
> > believe because the center hole in the disk is sli
On 06/04/2012 08:00 AM, gene heskett wrote:
>> Dawn is a much better degreaser. Fella talked me into using it a few
>> years back to wash down the surface of my cane rods before varnishing,
>> and it worked great. I started using it on the metal stuff I was bluing
>> and got more consistent blues
On 6/4/2012 8:46 AM, Mark Wendt wrote:
> It's getting much harder to get 200 proof pure ethyl alcohol anymore
> though. Our wondrous ATF has regulated it so much. I have about 1/2
> pint of it sitting here at work on my shelf.
>
Yep, they are certain that you are going to guzzle it down at
On 06/04/2012 09:02 AM, Dave wrote:
> On 6/4/2012 8:46 AM, Mark Wendt wrote:
>
>> It's getting much harder to get 200 proof pure ethyl alcohol anymore
>> though. Our wondrous ATF has regulated it so much. I have about 1/2
>> pint of it sitting here at work on my shelf.
>>
>>
> Yep, the
On Monday, June 04, 2012 09:24:51 AM Mark Wendt did opine:
> On 06/04/2012 08:00 AM, gene heskett wrote:
> >> Dawn is a much better degreaser. Fella talked me into using it a few
> >> years back to wash down the surface of my cane rods before
> >> varnishing, and it worked great. I started using
On 06/04/2012 09:28 AM, gene heskett wrote:
>> It's getting much harder to get 200 proof pure ethyl alcohol anymore
>> though. Our wondrous ATF has regulated it so much. I have about 1/2
>> pint of it sitting here at work on my shelf.
>>
> Phillips I assume? AKA Kentucky spring water...
>
On Monday, June 04, 2012 09:45:18 AM Mark Wendt did opine:
> On 06/04/2012 09:28 AM, gene heskett wrote:
> >> It's getting much harder to get 200 proof pure ethyl alcohol anymore
> >> though. Our wondrous ATF has regulated it so much. I have about
> >> 1/2 pint of it sitting here at work on my
On 06/04/2012 09:52 AM, gene heskett wrote:
>> If we can get non-DNA, non-isopropyl alcohol from Ace, I'll stop by
>> there on the way home from work today. ;-)
>>
>> Mark
>>
>>
> I'll let you know before the day is over. It also seems to make good
> shellac, but a funny thing, I needed som
On Mon, 4 Jun 2012 06:39:50 -0400
gene heskett wrote:
> On Monday, June 04, 2012 06:31:34 AM Mark Wendt did opine:
>
> > On 06/03/2012 11:39 AM, gene heskett wrote:
> >
> >
> >
> > > As for the various methods of blackening brass, discussed here
> > > previously, most were butt ugly, giving a
On Mon, 04 Jun 2012 09:40:51 -0400
Mark Wendt wrote:
> On 06/04/2012 09:28 AM, gene heskett wrote:
> >> It's getting much harder to get 200 proof pure ethyl alcohol
> >> anymore though. Our wondrous ATF has regulated it so much. I
> >> have about 1/2 pint of it sitting here at work on my shelf
On Mon, 04 Jun 2012 09:59:02 -0400
Mark Wendt wrote:
> On 06/04/2012 09:52 AM, gene heskett wrote:
> >> If we can get non-DNA, non-isopropyl alcohol from Ace, I'll stop by
> >> there on the way home from work today. ;-)
> >>
> >> Mark
> >>
> >>
> > I'll let you know before the day is over.
You from eastern KY?
On 6/4/2012 11:40 AM, dave wrote:
> Naturally, all of us keep a still with ground glass joints and a pound
> of sodium around just so we can make 200 proof.;-)
>
170 proof alcohol is a little hard to be around, the vapor can pretty
much knock you over if you open a hatc
On 06/04/2012 11:40 AM, dave wrote:
>> Nope, the label on this one sez "Ethyl Alcohol, U.S.P"
>> 200 proof
>> Anhydrous
>> For industrial use only
>> Bottled by The Warner-Graham Company in Cockeysville, MD, just down
>> the road a bit from me here at work.
>>
> 200 proof is anhydrous only un
On Mon, 04 Jun 2012 12:18:47 -0400
Mark Wendt wrote:
> On 06/04/2012 11:40 AM, dave wrote:
> >> Nope, the label on this one sez "Ethyl Alcohol, U.S.P"
> >> 200 proof
> >> Anhydrous
> >> For industrial use only
> >> Bottled by The Warner-Graham Company in Cockeysville, MD, just down
> >> the road
On Monday, June 04, 2012 02:01:38 PM Mark Wendt did opine:
> On 06/04/2012 09:52 AM, gene heskett wrote:
> >> If we can get non-DNA, non-isopropyl alcohol from Ace, I'll stop by
> >> there on the way home from work today. ;-)
> >>
> >> Mark
> >
> > I'll let you know before the day is over. It
On Monday, June 04, 2012 02:37:59 PM Dave did opine:
> You from eastern KY?
>
> On 6/4/2012 11:40 AM, dave wrote:
> > Naturally, all of us keep a still with ground glass joints and a pound
> > of sodium around just so we can make 200 proof.;-)
>
> 170 proof alcohol is a little hard to be around,
On 6/4/2012 2:41 PM, gene heskett wrote:
> On Monday, June 04, 2012 02:37:59 PM Dave did opine:
>
>
>> You from eastern KY?
>>
>> On 6/4/2012 11:40 AM, dave wrote:
>>
>>> Naturally, all of us keep a still with ground glass joints and a pound
>>> of sodium around just so we can make 200 pr
On Mon, 04 Jun 2012 15:25:15 -0400
Dave wrote:
> On 6/4/2012 2:41 PM, gene heskett wrote:
> > On Monday, June 04, 2012 02:37:59 PM Dave did opine:
> >
> >
> >> You from eastern KY?
> >>
> >> On 6/4/2012 11:40 AM, dave wrote:
> >>
> >>> Naturally, all of us keep a still with ground glass
On 6/4/2012 5:47 PM, dave wrote:
> There was a story about the former head of the lab I worked for. He
> came in one morning with a rip-roaring sore throat and asked one of the
> technicians what would help it; this was back when we had 190 proof or
> better around the lab for parathion analysis. T
On Monday, June 04, 2012 09:06:32 PM Dave did opine:
> On 6/4/2012 2:41 PM, gene heskett wrote:
> > On Monday, June 04, 2012 02:37:59 PM Dave did opine:
> >> You from eastern KY?
> >>
> >> On 6/4/2012 11:40 AM, dave wrote:
> >>> Naturally, all of us keep a still with ground glass joints and a
> >
>> Distilleries that make grain alcohol for consumption usually don't make
>> anything that is 100%/200 proof.
There's a physical limit on distillation of ethanol from water---you
can only get 95.6% (191 proof). If you want better than that you have
to add benzene and distill that, but then the pr
On 06/04/2012 02:05 PM, gene heskett wrote:
>
> Yeah, its DNA. Darn it.
>
Ah, nuts.
>
>> Ever have a gallon of spar varnish come blasting out of a cane rod "dip"
>> tube?
>>
> No, can't say as I have. What caused that?
>
The dip tube is a 1 3/4" diameter clear tube, with a remov
On Tuesday, June 05, 2012 10:23:40 AM Mark Wendt did opine:
> On 06/04/2012 02:05 PM, gene heskett wrote:
> > Yeah, its DNA. Darn it.
>
> Ah, nuts.
>
> >> Ever have a gallon of spar varnish come blasting out of a cane rod
> >> "dip" tube?
> >
> > No, can't say as I have. What caused that?
>
On 06/05/2012 10:56 AM, gene heskett wrote:
>> The dip tube is a 1 3/4" diameter clear tube, with a removable valve
>> threaded into a stopper. That plugs into the bottom of the tube. I'd
>> plugged the stopper into the tube, climbed up on the step ladder and
>> began to pour the varnish into the
On Tuesday, June 05, 2012 11:31:16 AM Mark Wendt did opine:
> On 06/05/2012 10:56 AM, gene heskett wrote:
> >> The dip tube is a 1 3/4" diameter clear tube, with a removable valve
> >> threaded into a stopper. That plugs into the bottom of the tube.
> >> I'd plugged the stopper into the tube, cl
I looked at similar some months back.
http://precisionmicro.com/6/processes/photo-etching-|-photo-chemical-etching-|-chemical-milling-|-metal-etching
These guys wanted £1000 to get started. Still not sure how many discs I
would get for that.
And an american crowd;
http://www.spgveco.com/precisi
On Apr 5, 2011, at 7:27 AM, andy pugh wrote:
> I just found this website:
> http://www.photofab.co.uk/index.php/products/optical-encoder-discs-and-actuators/
>
> I don't know what the pricing would be like, but that could be a
> perfect way to add a spindle encoder, if combined with
> http://uk.rs
On 5 April 2011 15:18, Tom Easterday wrote:
> This looks like a nice module if you want something very tiny...
> http://usdigital.com/products/encoders/incremental/modules/aedr
Ah, yes, that is the one I was looking for:
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduc
On Tuesday, April 05, 2011 11:45:11 AM Roland Jollivet did opine:
> I looked at similar some months back.
>
>
> http://precisionmicro.com/6/processes/photo-etching-|-photo-chemical-etc
> hing-|-chemical-milling-|-metal-etching
>
> These guys wanted �1000 to get started. Still not sure how many
On 5 April 2011 16:58, gene heskett wrote:
> Are y'all forgetting there is a bit of (I think python) code on the wiki
> that will carve what should be quite serviceable encoder disks?
Not at all, and I am using two home-made encoders on my mill and lathe
spindles.
However, if you need a small di
I've been playing with these:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=AS5134-ZSSTCT-ND
all you need is a magnet.
DougM
On Tue, Apr 5, 2011 at 9:11 AM, andy pugh wrote:
> On 5 April 2011 16:58, gene heskett wrote:
>
> > Are y'all forgetting there is a bit of (I think
>>
>> And an american crowd;
>> http://www.spgveco.com/precision+metal/products/precision+metal+parts
>>
>> quoted;
>> 10 $66.65/ea
>> 100$6.65/ea
>> 500
On Tuesday, April 05, 2011 12:49:03 PM andy pugh did opine:
> On 5 April 2011 16:58, gene heskett wrote:
> > Are y'all forgetting there is a bit of (I think python) code on the
> > wiki that will carve what should be quite serviceable encoder disks?
>
> Not at all, and I am using two home-made e
I have been given a quote for electrochemical machining of an encoder
for my project.
http://www.photofab.co.uk/index.php/services/chemical-etch-photo-etch/
There is a £95 setup charge, then another £100 for a sheet of parts. I
get 25 of my design (75mm dia) on a sheet, but only need 6 or so.
The m
These guys are on your turf too;
http://www.precisionmicro.com/
Except they wanted £1000 as minimum order
Regards
Roland
On 22 December 2011 16:24, andy pugh wrote:
> I have been given a quote for electrochemical machining of an encoder
> for my project.
> http://www.photofab.co.uk/in
On 22 December 2011 16:01, Roland Jollivet wrote:
> These guys are on your turf too;
> http://www.precisionmicro.com/
This is an interesting process I hadn't heard of before:
http://www.precisionmicro.com/49/processes/laser-evolved-electro-forming---leef
--
atp
The idea that there is no such t
> I have been given a quote for electrochemical machining of an encoder
> for my project.
> http://www.photofab.co.uk/index.php/services/chemical-etch-photo-etch/
> There is a £95 setup charge, then another £100 for a sheet of parts. I
> get 25 of my design (75mm dia) on a sheet, but only need 6 or
On Thursday, December 22, 2011 11:57:00 AM andy pugh did opine:
> On 22 December 2011 16:01, Roland Jollivet
wrote:
> > These guys are on your turf too;
> > http://www.precisionmicro.com/
>
> This is an interesting process I hadn't heard of before:
> http://www.precisionmicro.com/49/processes/l
On 22 December 2011 16:45, Anders Wallin wrote:
> a dream project of mine would be a telescope mount. To minimize
> tracking error one should measure the rotation directly on the geared
> axis (not the motor) and one wants maybe 4 million pulses (22 bits)
> per rev for that.
That sounds like a j
Le 22.12.2011 17:45, Anders Wallin a écrit :
>> I have been given a quote for electrochemical machining of an encoder
>> for my project.
>> http://www.photofab.co.uk/index.php/services/chemical-etch-photo-etch/
>> There is a £95 setup charge, then another £100 for a sheet of parts. I
>> get 25 of m
On Thursday, December 22, 2011 04:33:44 PM Anders Wallin did opine:
> > I have been given a quote for electrochemical machining of an encoder
> > for my project.
> > http://www.photofab.co.uk/index.php/services/chemical-etch-photo-etch/
> > There is a £95 setup charge, then another £100 for a shee
On Thu, 22 Dec 2011 17:13:11 +
andy pugh wrote:
> On 22 December 2011 16:45, Anders Wallin
> wrote:
>
> > a dream project of mine would be a telescope mount. To minimize
> > tracking error one should measure the rotation directly on the
> > geared axis (not the motor) and one wants maybe 4
dave wrote:
> The fancy encoder on some Fanuc motors comes to mind. I think Jon Elson
> doped out how to read one of them.
>
Yup, Fanuc serial pulse coders come in 64K, 128K and 1 million count
versions.
The 64K don't dither at all, too. These have A860-xxx part numbers, and are
called the (a
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