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Re: encoder head pitch, or, quit your griping.
On Mon, 7 Jun 1999 22:48:50 -0700, "Elliot Burke" <elliot@...>
wrote: Rather than gripe about HP not building what you want, build one yourself.Try to moderate your stridency, eh? Nobody was "griping" that HP wouldn't build what hobbyists desire. In fact, I alluded to the fact that they didn't HAVE the resolutions directly that we most wanted, by humorously observing that their Product Marketing Mgr. didn't seem to be too concerned with losing the "hobbyist market". This was OBVIOUSLY a joke and a recognition what we're small-fry in this market, not a "gripe". Yourself and Jon have both now said "pieceOcake" to build yer own. Fine. But since few of "us wee folk" can boast as you have, that we've "done consulting work for encoder manufacturers, in optical design", repeated statements that it's a no-brainer is likely to fall on deaf ears. Not everybody's inclined to sleuth out the insNouts of optical encoders/design just to get a linear motion detector. It's perfectly reasonable and NO gripe, to observe that the current sensors & scales don't yield the (for us) optimum native resolution of 0.001" per quad-count. Where do you see "griping" in THAT observation. Nobody said it was a show-stopper or a major impediment, simply an inconvenience and lament that something was so close. Instead of sounding like a know-it-all, if you think it's so bloody easy to build one of these yerself, why don't you TAKE the hobbyist approach, and the approach of this group, and EXPLAIN and describe HOW ordinary mere mortals like the rest of us lower life-forms could "easily build one ourselves"? And I don't mean by that, some glib hand-waving like "you just need an led, a detector, and a couple gratings spaces apart by soNso amount". If you wanna boast that it's "sooooo trivial", then put up or shut up. I might point out however, that one who boasts that ANY topic is "trivial and obvious to even the most casual observer", as we used to say in college, is quiet ILL suited to then changing hats and becoming a sharer of his good things. From that point on, the thot is always lurking that the person is sharing his knowledge for the sposed ego boost, rather than the enjoyment of collaboration amongst fellows. You might wanna consider this in the future. Gar |
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encoder head pitch, or, quit your griping.
Elliot Burke
An encoder head is very simple. Look inside an opto mechanical mouse for an
example. All the parts can easily be put on one circuit board: LED, detector (quad), op amps, level comparator. A analyzer grating is is placed above the detector. Rather than gripe about HP not building what you want, build one yourself. This has got to be the simplest thing in your CAM system to build. As an aside, I will mention that I've done consulting work for encoder manufacturers, in optical design. You won't have the fancy electronics that the encoder people can build now. They have integrated multi element detectors with amplifiers, phase decoders and counters all on one piece of silicon. If you really want something to lust after, try to get that! If anyone is interested, we can talk about the Talbot effect. Mouse electronics count fringes. A serial port mouse sends the position data to the computer when inquired or when state changes. I wonder if these could be adapted to DRO's? Elliot Burke |
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Re: LINUX -Beginners Level
Jon Elson
WAnliker@... wrote:
It is ALL online! Unfortunately, not all at the same place.[What a good idea! I second the motion. I've been trying to follow thisOr possibly online sources and downloads, or possible direct requested file You can download all of Linux from RedHat and other outfits. But, of course, we're talking about 600 MB of stuff for the full install (one entire CD). If you don't have a direct ethernet-speed connection, you WON'T want to do this. The EMC source is all available as one file, it is pointed to by the EMC software web page at NIST. The real-time patch for Linux is also on the web. Some previous messages have given the URL's. Jon |
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Re: Good buy on encoders 10000 line encoder wheel and HP HEDS 9100 encoder.
Tim Goldstein
How would someone reach Electronic Goldmine and is their a part number they
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refer to this item by? Tim [Denver, CO] -----Original Message----- |
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Re: Linux RT/EMC CD
Tim Goldstein
There are may people selling copies of the RedHat distribution for only a
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few $ and is you want you can actually download the whole thing for free ftp://ftp.redhat.com/redhat/old-releases/redhat-5.2/i386/ is one source). But, if you have never installed or used Linux I would H I G H L Y suggest that you get the Official RedHat Installation Guide book. Without it you have very little chance of getting Linux installed and running. So, considering the book is almost mandatory you may as well run off to your local software vendor and pick up a boxed set of RedHat 5.2 which includes the book and a number of application. Besides, buying the real boxed RedHat set helps support some of the people that are trying to make Linux easier to install and use. I would also suggest not tarrying as the RedHat version that is current is 6.0 and at this point you can not run EMC on the kernel that is included in 6.0 from what I have been told. Tim [Denver, CO] -----Original Message----- |
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Re: Good buy on encoders 10000 line encoder wheel and HP HEDS 9100 encoder.
mike
what page of the catalog???
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Andy Olney wrote: From: "Andy Olney" <aolney@...> |
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Re: Linux RT/EMC CD
"Mo" <[email protected]
for a Linux Distribution that is actually RedHat 5.2 with the real timecost with a Full version of RedHat 5.2 (I am guessing this means the books andOn the subject of Redhat 5.2 prices, the lowest I've found is a small company here in the U.K which sells the distribution for 2 (approx. $3) most other Linux related CDs there are at the same price too. Even with shipping should still work out cheap. Mo |
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Re: Linux RT/EMC CD
Tim Goldstein
I haven't tried the product, but Ron Wickersham previously posted the URL
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for a Linux Distribution that is actually RedHat 5.2 with the real time patch already installed. The website is . The cost with a Full version of RedHat 5.2 (I am guessing this means the books and all?) is only $45.00 and if you want just CD 1 (in RedHat that is all you need to get it installed) it is $35.00 I talked with Fred Proctor about this product and he thought it might make it easier for someone getting started, but had not tried it to verify that it does work correctly. I have no reason to purchase it as I have already gotten through the patching the kernel barrier with the help of Matt and Jon, but if someone wanted to pop for it I would be happy to load it on a spare system and see if it will do what we need and then ship it back to the owner. Tim [Denver, CO] -----Original Message----- |
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Good buy on encoders 10000 line encoder wheel and HP HEDS 9100 encoder.
Andy Olney
On the subjecto of encoders, Electronic Goldmine has a DC motor with encoder
for $3.95. It is a 1000 line 2 inch? dia. wheel and a HEDS 9100 encoder which is also good for linear strips. I am planning on using the parts and pitching the motor. Andy Olney |
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Re: AUTOMATIC TOOL CHANGER
Dan Mauch
Interesting. I may eventually try casting something also.
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Dan -----Original Message-----
From: John Grant <grantjoh@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Monday, June 07, 1999 8:58 AM Subject: Re: [CAD_CAM_EDM_DRO] AUTOMATIC TOOL CHANGER From: John Grant <grantjoh@...>discussion of shop built systems in the above catagories. |
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Re: AUTOMATIC TOOL CHANGER
Dan Mauch
I found found the 2 degree motors. it was not problem at all.
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BY the way what did that commercial made ijection moulding machine cost? Dan -----Original Message-----
From: Brian Fairey <bfairey@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Monday, June 07, 1999 7:13 AM Subject: Re: [CAD_CAM_EDM_DRO] AUTOMATIC TOOL CHANGER From: Brian Fairey <bfairey@...>verticle mill???????? Brian, Ont, Can.Simplomatic in Chicago. for amy JET 13X25 lathe. It has 6 posistions. I plan to drive it directly with posistion.nema 34 stepper motor rated at 150 oz inches. discussion of shop built systems in the above catagories.The radial forces are dealt with within the turret attachment. discussion of shop built systems in the above catagories. |
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Re: AUTOMATIC TOOL CHANGER
Dan Mauch
It was based on the Gingery book. If it work out well I plan to build a
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hydraulic version. I think it would be easier and cheaper. Dan -----Original Message-----
From: PTENGIN@... <PTENGIN@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Monday, June 07, 1999 1:38 PM Subject: Re: [CAD_CAM_EDM_DRO] AUTOMATIC TOOL CHANGER From: PTENGIN@...discussion of shop built systems in the above catagories. |
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Re: Linux RT/EMC CD
In a message dated 6/7/99 12:57:56 PM Pacific Daylight Time,
paul@... writes: course). I would initially see how to do step A installing on a bare machine, including how do you boot in the first place, with DOS, or LINUX? Then would be interested in the next steps. Can the programs be downloaded online now, and where, and which programs? I think that those interested in the LINUX system as we are discussing, that have no experience what so ever have to start with the very basic steps, at least I do. Then I assume we have to upgrade the kernel?????? bill list manager |
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Re: plastic strips for encoders
Jon Elson
Gar Willis wrote:
The SENSORs that US Digital relies on, namely those made by HP, are NOTIf you can get the strip in a resolution that you like, it is really easy to make the read head. What you do is take two small pieces of the strip and place them over the photocells, and provide a means to move one of the photocell/grating units up to 1/2 of a grating pitch. Another way is to use one large piece of the strip that covers both photocells, and allow the entire unit to be rotated relative to the normal axis of the grating. The correct angle puts the photocells closer together by 1/4 of a grating pitch. This is about all there is in the HP head, an LED, 2 photocells and a dual comparator chip. Jon |
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Linux RT/EMC CD
I have the equipment to do that, but I'm a bit pressed for time at the moment. Still, this could be an interesting project. There are a couple of ways this could go: a) A rt/emc distribution disk that installs from scratch on a bare machine. b) A rt/emc upgrade disk that updates a current linux system with emc and an rt patched kernel (including all of the sources, of course). B is a lot easier to do since you could put together a generic kernel that would run with most hardware and ignore the configuration problems with X, setting up disks, etc. Loadable modules would keep the kernel size down to something reasonable. I think option A might have a pretty wide audience, but B is probably more doable in the short term. How many might be interested in an option B disk at, say $49? If I get 10 or so affirmatives, I would persue this. Another option would be to bundle it with a currently produced distribution so you'd load and configure linux and then do the rt/emc upgrade. These would be CDRs; you can get pressings of a 100 or so CDs, but the costs don't get reasonable until you're in the 500-1000 range and this software is moving too fast to immortalize that many copies. Either reply on the list or send me e-mail direct; I'll summarize in a couple of days. Paul -- Paul Amaranth | Rochester MI, USA Aurora Group, Inc. | Software Development paul@... | Unix / C / Tcl-Tk |
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Re: AUTOMATIC TOOL CHANGER
John Grant
Dan Mauch wrote:
I am currently working on two new projects.I built a "spin caster" several years ago. It is designed for "white" metal parts but can be used with polyester resin. John Grant |
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Re: AUTOMATIC TOOL CHANGER
In a message dated 6/7/99 3:41:56 AM Hawaiian Standard Time,
dmauch@... writes: << 2. An injection molding machine to make plastic parts. >> Dan, Tell us more. Is this based on the Gingery book or is it a scratch built machine? Hydraulic or what for the clamp? I've got a OMRON controller for a similar machine. Peter |
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subject. Keeping correct.
To all list members receiving the digest version.
Please note that if you just hit reply to a post, that the digest Number will appear as the subject, and it is hard to follow a thread. Please manually correct your subject to that of the posting you are replying to. 194 members today, come on in and you lurkers, join the fun, and make the rest of us think, or answer your questions, needs. Thanks bill list manager |
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Re: LINUX -Beginners Level
In a message dated 6/7/99 9:48:27 AM Pacific Daylight Time,
drewid@... writes: Or possibly online sources and downloads, or possible direct requested file transfers. It would sure help the beginners to join the LINUX world, of CAM bill list manager |
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