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Re: Still lurking
I don't know if these book marks work with everyone's internet servers but
here are a bunch I've got so far...(Thay're named so I know what they mean, but if you see a subject that sounds interesting click on it. Also I recommend checking out all of the pages with someone's name on it....they are very helpful!) <A href=" ">some store?</A> <A href=">cnc1</A> <A href=">cnc2 Jon elsons page </A> <A href=" ">servo supplier san diego motion </A> <A href=" ">cad/cam supplier</A> <A href=" www.jrkerr.com">servo boards?</A> <A href=">motors</A> <A href=">computer stuff</A> <A href=" ">stepper motors</A> <A href=">cnc3</A> <A href=">cnc4</A> <A href=">testbeds?</A> <A href=">ted's page</A> <A href=">matt shavers page</A> <A href=">redhat software</A> <A href=">Home machining & CNC</A> <A href="www.meci.com">electronics surplus</A> <A href=">CADEM</A> <A href=">capsmill </A> <A href=">NSK Corporation manufacturer of bearings and related precision products </A> <A href=">ron gingers page </A> <A href=">G codes</A> <A href=">more cad manufactureres</A> <A href=">Lindsay Publications Inc</A> <A href="www.metalworking.com">dan's stuff</A> <A href=">ballscrews</A> <A href=">Paramount Machinery Corp. Inventory Price List </A> <A href=">CNC Retro-Fit Links </A> <A href=">free software </A> <A href=" ">dans page 2?</A> <A href=">thomson</A> |
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List Question
Stephen Barmash
I'm still a lurker at this point but I favor keeping this group together. Although most of the discussions go right over my head some of the talk has been superficially absorbed. I hope to see some more discussion aimed at the newbie level, especially the small inexpensive machines since I'm limited to apartment size equipment. With no electronic background and only a little home shop experience this is an intimidating subject without even getting involved with Linux. It was only 4 or 5 months ago that I became aware of the Linux OS.
A few months ago I had a chance to bid on a bench-top CNC machine, the Dyna Myte 2400c, sold by Dyna Mechtronics of Sunnyvale, CA. Although I ended up not bidding on this machine, it seemed like a much better package than all the Sherline conversions I had seen advertised. And it was a rather expensive machine if you bought one new. However, this machine has been out of production for 7 years and there is little factory support available. Is anybody familiar with this machine or the larger machines Dyna Mechtronics sells. I still wonder if I made a mistake not bidding on this machine. One of the problems with this group is that a few of you guys don't appear to get any sleep; this is an incredibly active discussion group. Even a lurker has a hard time just keeping up with the postings. But please keep in mind that some of the audience to these discussions are not up to speed on this subject. Let the members be responsible for their own editing of the list's threads. Regards, Stephen Barmash Rockville, MD |
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Re: List question
On Thu, 17 Jun 1999 01:50:07 -0500, mike grady <mgrady@...> wrote:
why cant all emc posts have emc at the beginning of the subjectThat would work, but requires voluntarism from just the opposite folks, than are being annoyed by a barnburner. Still, I've seen that used effectively to shield tangential stuff from the general listener. One minute problem, BTW, with making use of this "diplomacy" step, is that the current prefix [CAD_CAM_EDM_DRO] is sooooo bloody long to begin with, that adding another further filtering suffix like EMC: just makes it even HARDER to read the subject lines in any reasonable length field. Now that the group's at "cruise altitude", how hard would it be, ObieWan, to shorten that some? Maybe to "CNC+" or something short. Gar |
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Re: List question
mike grady
it does but it took me about 30 seconds to set a mail filter in netscape
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the cnc+ or something short is a good idea mike Gar Willis wrote: From: garfield@... (Gar Willis) |
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Re: List question
On Thu, 17 Jun 1999 00:37:52 -0600, "Tim Goldstein"
<timg@...> wrote: Actually, Fred Proctor (the honcho that is in charge of EMC over at theGood heavens, now WHY would he do a thing like that?? Oh well, I guess it works both ways, eh? But IF that's the case, that's perhaps mutha naicha's way of suggesting that the focus of a purely EMC list is sub-optimally narrow? But geez, how can that be?; EMC alone is no smallish puppy, in itself. Guess I dunno. It's a problem similar to evolution maybe, that shows just how much diversity or focus is the best balance. A successful organism is a flexible one. Heh. Gar |
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Re: List question
mike grady
why cant all emc posts have emc at the beginning of the subject
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so mail filters could be set to move to a different folder for those who don't want to see them or read separately?? mike Tim Goldstein wrote: From: "Tim Goldstein" <timg@...> |
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Re: List question
Tim Goldstein
Actually, Fred Proctor (the honcho that is in charge of EMC over at the
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NIST) posted to the EMC list that they should subscribe here as there was more active discussion on EMC subjects here.(heavy paraphrase of his posting) Tim [Denver, CO] -----Original Message----- |
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Re: Still lurking
Tim Goldstein
Raynor,
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It sounds as if the parts you are looking to make are quite small. What do you think is the max dimension of parts you are thinking of making? If it is not too large you may want to look at converting a mill drill machine to CNC as it would be much quicker than building your own from scratch and would handle heavier work than a router if you need to at some point. Grizzly is a supplier of a variety of reasonably priced machines. Check them out at EMC is a free controller software developed by the National Institute of Standards and Technology that has most of the features of the top end systems and can run steppers or servos. Check out Linux is the computer operating system that EMC runs on. It is written as part of the open source movement and is available for free, but the consensus of the people running it is to buy a commercial package that includes an installation manual for $30 - $50 to give yourself a reasonable chance to actually get it to work. Currently EMC is configured for the 5.2 version of Linux put out by RedHat. Check out Hope this helps you follow the action. Glad to see you stepping out from the closet. Tim [Denver, CO] -----Original Message-----
From: Raynor Johnston [mailto:rhj-rbj@...] Sent: Wednesday, June 16, 1999 11:45 PM To: CAD_CAM_EDM_DRO@... Subject: [CAD_CAM_EDM_DRO] Still lurking It sounds like it's all great stuff. I only wish I knew what the hang you guys are talking about Linux and Grizzly and EMC but what i do know is that one or all of those subjects are likely to become damn important to me when I come to want to control my router so I reckon keep it all together as only by exposure to it am I going to get to understand whats being said. By all means have some other threads going afterall I want to know about guideways rods ballscrews and etc to decide what to use. Any recommendations for starters (routing sheet metals brass, aluminium and plastics abs,acrylics and styrene mostly for model components in 1:72 and 1:24 scales). Keep up the terrific work everyone. Raynor J |
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Re: MaxNC modifications
Tim Goldstein
I don't know if your problem is the same, but I had the same thing happen to
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me as I increased the amps I started getting problems with lost steps on curves. It was particularly bad with about a 1/2" radius and moving around 7 ipm. The step loss was quite consistent on the parts with curves, but I could do slow or rapid moves along an axis all day long and the moves were perfect with no steps lost. It ended up being a shielding problem. I thought the interference was coming from the mosfets & heatsinks, but Jon made a post and thinks it is from the circuit board (with his knowledge and understanding I don't have much reason to disagree). Dan Falck posted about having a similar problem as he upped the juice on his system also. The fact that your loss of steps increased as you upped the amps makes me think you are experiencing the same type of thing. When I was lossing steps I also would notice that the motor was running very ragged. More shielding caused my step loss to go away and the motor started sounding much smoother running. Tim [Denver, CO] -----Original Message----- |
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Re: List question
On Thu, 17 Jun 1999 00:44:16 -0500, Jon Elson <jmelson@...>
wrote: There is an EMC mail list, at emc@...OH, so there ya go; once people get turned onto EMC, they're likely to migrate much of their questions over thar anyhoo. So long term, not likely we have to worry about this becoming "another EMC list". Again, just me dos centavos. Gar |
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Re: List question
On Thu, 17 Jun 1999 01:17:18 EDT, WAnliker@... wrote:
Right now thereOn our aviation engine list that's now over 2 years old, we've repeatedly had the same sorta "firehose" phenom, whenever we get some barnburner of a thread going. It might seem plausible to split the list, but it becomes obvious to list denizens that this is infeasible, as soon as a few such barnburners have come and gone, and people realize that with such an interesting and rich focus area, it's inevitably gonna actually happen overNover again. Hee. The BEST solution to those annoyed by the firehose on topics they're not currently jazzed about, is to freely switch backNforth from "firehose mode" to "lounge lizard mode" (aka digest). When something like the EMC thread fires up (which I TOO am not currently hot for, but like to watch from the sidelines, cuz someday, who knows...), and the volume gets to be too much for ya, consider going to lounge mode if skipping thru individual posts isn't your cupOtea. That way, in digest mode, you can scan thru the digest very quickly to find any morsels you're hoping for, and when YOUR barnburner of a topic fires off, or when the current barnburner abates, then switch back to normal mode. Since it's easy as pie to switch backNforth, via the Onelist interface, it's a no-brainer. We should just be thankful that the list is so hot as to keep the topics focused on the chartered subjects. If you wuz askin me opinion, I see no real justification for a split. Just me dos centavos. I would say to anyone if your subject is not being discussed, jump in andI agree, the best way to get a barnburner going is to light the match, then stoke the fire. Gar |
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Re: List answer
George Potter
Hi Bill (and list),
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As a confirmed lurker, I'll just say that I'm extremely interested in the EMC / Linux stuff currently going on ...... I'll probably have a Linux machine running shortly (have all the pieces, just no time) ..... and then once I get finished building our house, I'll start a CNC conversion on my trusty and well worn Bridgeport (yes, I'll have to grind / scrape the ways, install ball screws, and all that), and then will become a bit more active in the list. To all actively posting, THANKS, as I'm getting lots of good ideas. Regards, George Potter WAnliker@... wrote: a message that said the list is over 200 names, but it appears to meAs of tonight there 203 on the list, we have lost around 15-20 that have |
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Re: MaxNC modifications
Jon Anderson
Tim,
The only that that has remained the same since I first ran into lost steps is the MAXNC ways and thrust bearings on the leadscrews. Everything else has been swapped or scrapped at least once. We've even tried swapping drivers to different axis' and moving motors around. To be sure, it's a LOT better than it was. Initially we were getting some pretty random lost steps. Sometimes a little, sometimes a lot, this with the MAXNC software. Ah-ha reduced lost steps a lot and at first we thought we'd licked it. MAX software would lose 4-5 steps just interpolating a single circle. Ah-ha lost steps didn't surface until we tried running real world parts. All the little test routines I'd written for debugging the MAX passed muster with Ah-ha. I should have made that distinction up front. We've cranked the motors up to 5 amps and they just get noisier. Can't recall, but I think it did change the lost step amount for the worse. I can do single axis linear moves at 60"/min all day and not lose steps, running at 3 amps. Did have someone mention quite some time back that I ought to put some large capacitors between each driver and the PS to help reduce current draw during sudden acceleration. Does this sound like something I ought to try? I should have made notes then and there, but I don't recall how I was to size the caps. Jon |
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Still lurking
"Raynor Johnston" <[email protected]
It sounds like it's all great stuff. I only wish I knew what the hang you guys are talking about Linux and Grizzly and EMC but what i do know is that one or all of those subjects are likely to become damn important to me when I come to want to control my router so I reckon keep it all together as only by exposure to it am I going to get to understand whats being said.
By all means have some other threads going afterall I want to know about guideways rods ballscrews and etc to decide what to use. Any recommendations for starters (routing sheet metals brass, aluminium and plastics abs,acrylics and styrene mostly for model components in 1:72 and 1:24 scales). Keep up the terrific work everyone. Raynor J |
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Re: List question
Jon Elson
Ron Ginger wrote:
From: Ron Ginger <ginger@...>There is an EMC mail list, at emc@... I can't find subscription info, but if you email Fred Proctor at proctor@... he should be able to put you on the list. Jon |
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Re: List question
Andy Olney
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----- Original Message -----
From: Tim Goldstein <timg@...> To: <CAD_CAM_EDM_DRO@...> Sent: Wednesday, June 16, 1999 9:17 PM Subject: Re: [CAD_CAM_EDM_DRO] List question From: "Tim Goldstein" <timg@...>or is that handled by the computer it is attached to?The picservo board reads the encoders (750000 Khz?) with a dedicated pic chip sends it to the controller chip then closes the loop all on the board. He sells a chip set for 32 bucks if you want to build your own board. I had a small servo running in a couple of hours with the included test software. It is a nice machine, good fit and paint, adjustable bearings on all the lead screws, seems tight. I am an ME not a machinist and don't have enough experience to know what it is lacking. I wanted a machine with a knee and this was the least expensive new machine. Have you started to convert your machine to NC yet? What are you planningto use for your servo motors?I have to go. Timboards discussion of shop built systems in the above catagories.from www.jrkerr.com that I am intending to use to move my table. To Unsubscribe: |
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List splitting - NO
Mark Fraser
Dont split the list - I'm gonna do the Linux / CNC / Sherline Mill retro thing
within the next few weeks, and I also will be DRO'ing my lathe. I can handle the extra traffic, but might miss something in a second list. / mark (Whose EE dates to '68, when they STILL taught us vaccuum tubes....) |
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