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Re: Source for inexpensive drivers and stuff
JJ
Uh, yea :-)
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Thanks, JJ Be Kind, Be Careful, Be Yourself -----Original Message-----I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to |
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Re: Source for inexpensive drivers and stuff
turbulatordude
maybe this URL will work better ??
--- In CAD_CAM_EDM_DRO@y..., "JJ" <jj5412@e...> wrote: Have a look at www.camtronics.com. I use the same components(L297/L298) on boards of my own design and get great results. Rapids go up to60IPM (30 is practical on my machine). The best I could get with unipolarstuff got outaround to it... makingbetter than expected. Now that I have it up and running (and powermoney) I am looking at building another, smaller CNC, probably a worksupply from Microkinetics and some beefy motors. While these all project.quite well, they tend to drive up the overall cost of the motorWould anyone know where I could find some rather inexpensive bedrivers? What about a power supply? I'm thinking about using NEMA be asimple, inexpensive, and already or mostly assembled. i'm aI consider this to sister site to the CCED group, as many of the same members arethere, for OT subjects, that are not allowed on the CCED list.THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ |
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Re: Source for inexpensive drivers and stuff
JJ
Have a look at www.camtronics.com. I use the same components (L297/L298)
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on boards of my own design and get great results. Rapids go up to 60IPM (30 is practical on my machine). The best I could get with unipolar drive was 9IPM. Regards, JJ Be Kind, Be Careful, Be Yourself -----Original Message-----I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to |
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Re: Source for inexpensive drivers and stuff
--- In CAD_CAM_EDM_DRO@y..., "Dave Rigotti" <drigotti@a...> wrote:
Seth,Dave, PERFECT! I was looking at your plan-set. why do you not recommend faster travel speeds? Rigidity? dremel tool can't keep up? Thanks a lot, Seth |
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Re: Source for inexpensive drivers and stuff
Dave Rigotti
Seth,
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How about Hobby CNC? www.hobbycnc.com Regards, Dave Rigotti Hobby CNC ----- Original Message -----
From: "dgmachinist" <scsm@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, October 27, 2002 10:19 PM Subject: [CAD_CAM_EDM_DRO] Source for inexpensive drivers and stuff aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: Force for foam cutting
galt1x
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----- Original Message -----
From: "Les Newell" <les@...> To: <CAD_CAM_EDM_DRO@...> Sent: Monday, October 28, 2002 12:05 AM Subject: Re: [CAD_CAM_EDM_DRO] Force for foam cutting Very little force is needed. We often cut shapes out of 2" foam in onepass at 4.8 m/min (approx 190ipm) with a 1/2" cutter spinning at 18000 rpm.Dust extraction is essential otherwise the whole room will have an even coatingaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: Force for foam cutting
Les Newell
Very little force is needed. We often cut shapes out of 2" foam in one pass
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at 4.8 m/min (approx 190ipm) with a 1/2" cutter spinning at 18000 rpm. Dust extraction is essential otherwise the whole room will have an even coating of foam dust! If the cutter is sharp you end up with a finish at least as good as hot wire. Les How much force does it take to cut foam with a CNC router? I've |
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Re: "Light Bulb" EDM ???
John
Rust dissolving fluid is tartanic acid based. It's _exactly_ the same stuff
in the coke your kids and I drink too much of. I don't know if there's a high enough concentration of it to work in coke though. I bought some from an auto shop and it's a greeny coloured gel. You just paint it onto the areas, leave it for ten or so minutes, then agitate it with a scouring pad, toothbrush or paintbrush. You can then leave it a while longer or wipe it off and apply a new layer. After a little while the gel looses it's dissolving ability. For light scaling of rust it might take one go to get it clean and another to shiny. For really heavy rust it'll take a few. The more you can scrub off first the better. Although it doesn't attack the clean metal like it does the rust, it seems to leave a slightly dull appearance on the surface. All the best, John H. Franco,aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Re: Source for inexpensive drivers and stuff
stevenson_engineers
--- In CAD_CAM_EDM_DRO@y..., "dgmachinist" <scsm@m...> wrote:Have a look at They do a 3 axis ready built bipolar driver setup for $90.00 Max of 35 volt and 2.5 Amp output. More than enough for small 23 steppers. Far cheaper than any of the kits I have seen and as I mentioned ready built which means it's quicker and less of a headache. I have bought a few of these for a product I do and I'm very impressed with them. I only need 2 axis but at this price it's cheaper to just not connect one axis up They have also indicated they are going to do a seperate one axis card for about $30.00 if you need to go the 4th Axis route. John S. power supply from Microkinetics and some beefy motors. While these allwork quite well, they tend to drive up the overall cost of the project.be simple, inexpensive, and already or mostly assembled. i'm a |
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Re: Force for foam cutting
At 12:52 AM 10/28/02 -0000, you wrote:
How much force does it take to cut foam with a CNC router?Not a bit more than it takes to move the table. The foam melts away before the wire touches it if your heat and feed is right. I've searched the web but only found references for hot wire cutters. Iaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ billRegards, Hoyt McKagen To prevent virus propogation, don't put this addy in your book Belfab CNC - US Best MC - Camping/Caving - Two-Wheel-Tech List - If you torment a serpent, it will cough up a dead rat |
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Re: Added a VFD to my CNC mill
Country Bubba wrote:
However, I cannot find reference to this information in the NEMA file listed above:{( Also, nobody that I have talked with can tell me WHY the belted rate is lower than the direct drive rate???Two possible reasons. One, is that V-belts will not stay on pulleys above a certain speed. they will flip over and flay themselves in minutes. This is somewhat diameter-dependent, as the smaller pulleys generate more centrifugal force as the belt whips around the smaller radius, for the same linear belt velocity. Second is the belt puts a radial load on the bearings, heating them more. Jon |
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Re: Force for foam cutting
Doug Fortune
vrsculptor wrote:
Practically ZERO, its like moving the tool through the air. To prove it to yourself, grab a dremel (I use a heavier Sears Die grinder), mount a ballnose bit (I use up to a 1.5" dia), and take a few manual swipes by hand through a hunk of foam. I'll bet you can't tell whats air and what is foam! Doug Fortune . |
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Re: Added a VFD to my CNC mill
Dan Mauch wrote:
I am going to figure out how to use the analog signal from DeskwinNC toYes, VFD's are really nice! I'll never go back to a static phase converter. I suspect these motors can be pretty safely operated at twice the rated speed. There was some serious discussion about higher speeds on rec.crafts.metalworking, and people with contacts in the woodworking industry indicated that it was fairly common to run 60 Hz motors at 400 and even 800 Hz, and that motor manufacturers had told them that 400 hz (2 and 4 pole) motors were built with the exact same materials in the rotor as the 60 Hz motors. I am pretty skeptical of all that, and would rather see this first before believing it. I suspect a solid (meaning no spokes) pulley is capable of taking at least twice rated speed. Bridgeport J heads are available with dual speed motors or the high-speed option, to go to 4250 RPM. With the cost of good spindle bearings, I really would not want to exceed that. Now, taking that standard head, and running a 60 Hz motor at 400 Hz, you'd be running the spindle at 28333 RPM. While the spindle probably would not explode at that speed, the pulleys would, indeed, be at dangerous speeds for their construction. I can't imagine the belt would handle this at all, though. V-belts tend to flip over when run at excessive speeds, and then shred themselves in minutes. Truly calculating the max safe speed involves computing radial loads from centrifugal force, and then also analyzing the natural vibrational frequencies of the parts, and making sure you don't operate at a speed where the rotational rate and the bending natural frequency coincide. That is the first critical speed, and resonance can develop into fantastic explosive force in just a few revolutions. It requires a pretty detailed mechanical analysis to figure out where these resonances will occur. 28333 RPM = 472 revs/sec, which is not an unreasonable natural frequency for some of these components. But, all that is meaningless, because bearing life of some of the smaller bearings in the head would be reduced to minutes. Even with the best oil, the spindle bearings would be toast (literally) in a few hours, tops. I have heard of people running Bridgeport and similar spindles up to 7500 RPM or so on occasion, but it seems a bad idea. If you have a real need for high spindle speed, why not put in an auxilliary direct-drive spindle? I picked up a Rockwell/Precise spindle that can run up to 45,000 RPM, and it is DESIGNED for that use. I got it for a song on eBay! Jon |
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Re: Best benchtop 3D CNC milling machine
Andrew Werby wrote:
[By "high speed", are you referring to the spindle speed, the feedrate, orYes, I read a book on high speed machining. The grand finale was a report by a group at Boeing, I think, that had modified a Cincinnatti gantry bed mill with a 75 Hp, 75,000 RPM spindle. The were running a 1/2" end mill at 75,000 RPM, and used up all the spindle HP when they were removing aluminum at a rate of 600 Cu In/minute! They did not use any coolant, as the whole idea of high speed machining is that the WORKPIECE becomes the coolant! The spray of chips from this process eroded and broke through a cinderblock wall during their tests! Definitely out of the range of the home shop, I decided! Jon |
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Re: Source for inexpensive drivers and stuff
Jim Brown
Why not stick with Gecko's?
You cant go wrong with them and thier customer support is the best in the industry, not to mention that there products are very reliable and precise. Myself, I wouldnt skimp on the drivers. After all, thats the heart of any good CNC stepper system or servo system. Just my two cents worth. Regards, Jim dgmachinist <scsm@...> wrote: Hello all, Just joined the group. I've been lurking for a bit now, finally got around to it... I just finished building my CNC Router. (24"x26"x5") It came out better than expected. Now that I have it up and running (and making money) I am looking at building another, smaller CNC, probably a Dremel tool type, 12"x12"x3" (for engraving only) This is my query: On my first machine, I used Gecko's, a nice power supply from Microkinetics and some beefy motors. While these all work quite well, they tend to drive up the overall cost of the project. Would anyone know where I could find some rather inexpensive motor drivers? What about a power supply? I'm thinking about using NEMA 23's, which should be more than enough. Whatever I get, it has to be simple, inexpensive, and already or mostly assembled. i'm a machinist, not an electrical engineer. :) Thanks in advance Seth Addresses: FAQ: FILES: Post Messages: CAD_CAM_EDM_DRO@... Subscribe: CAD_CAM_EDM_DRO-subscribe@... Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@... List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@... Moderator: jmelson@... timg@... [Moderator] URL to this group: OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to --------------------------------- Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Machine fully running!!! now programming problems :(
mueller914
I finally got all 3 axis of my Shoptask servo motor CNC conversion
finished and running properly. I tried to make a NC file using Vector to create the G codes...it sorta works. Basicly I want 5 holes .215 diameter and two holes .50 square. My bit is 3/16's and using cutter comp(or trying), the small holes still come out to about .320 and the large square holes are .6+ and one side of the square holes is not being cut, I get an upside U. Also with Vector, do I have to manually enter my Z values? When I ran the program, it was only one plane and I don't remember gettign propted to enter a depth. Does cutter comp get entered into the code or the machine? I see a prompt in TCNC, but I've never seen the format it is asking for. turbocnc is my nc driver mueller914@... |
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Re: Wiring of gecko drives in a CNC controller Im Building
Alan Matheson
Subject carefully chosen so I'm within the groups area!
I have 4 Gecko 201 drives in a controller Im building. Does anyone know if I can connect all the Disable inputs together and switch them to ground using one set of contacts or must I switch the Disable line from each drive to ground using a separate set of contacts. I'm a little concerned in case the drives interact with each other if I just join all the Disable lines together and let them float during normal operation. Alan Matheson |
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