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Re: Single point cnc threading
Matt Shaver
On Saturday 26 October 2002 09:25 am, you wrote:
Matt, I have not used EMC for several years now so I was surprised toI'm not doing it yet. First I've got to finish retrofitting the lathe with a spindle encoder (probably just a few pulses/rev). Then I need to get the software to cooperate. It's been a while since a major feature has been added to the EMC, and even longer since I've contributed anything worthwhile, so it seems a good goal to aim for. Plus, I've got a Hardinge HNC I need to retrofit and that has to have threading, so it's got to be done. Matt |
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Re: CNC'd drafting machine?
William J Blocher
Hello Group,
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I've got a CalComp Design Mate Model 3036 plotter that I bought from a friend for $100. It seems to fire up OK but I can't get it to communicate with my computer. I've got the current drivers but I guess I'm not smart enough to make it work. If there is someone in this group that lives in the Minneapolis area and would like to have it for free they would be welcome to it. Please contact me off list at wjb1060@... to arrange a pickup time. Bill On Sat, 26 Oct 2002 10:27:37 -0400 hllrsr@... writes:
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Names One of the very few Off Topic posts allowed......................
NAMES is a Model Engineering show that is held in Detroit Michigan the last
week of April, This is where the CCED list was first dreamed up and where the first 13 members signed up to get it started. The reason the list was started was because I could not hear what was being said there, and the trouble finding information for the "do itself person" it has grown from there. There are three main shows in the US for Model engineering. CABIN FEVER in York, PA in January. NAMES in Southgate, Mich. in April PRIME in Eugene, Oregon in Sept. The NAMEs show also has seminars and displays showing CNC equipment built, or modified for CNC operation. Cabin Fever had a seminar the last time I was there. I just returned from Prime, and will be going to Cabin Fever in Jan, and NAMES in April bill LIist Mom |
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This is OFF TOPIC please drop it.Where are Outlook files?
The list is designed to help you build or modify equipment to help you have a
CNC, along with the supporting CAD, CAM, and EDM. The list is not for: SPAM, GENERAL COMPUTER STUFF flaming feeds, SPEEDS VISES, VACUUM HOLD DOWNS This list covers only four subjects and nothing else there are other general lists for other subjects. Cad, the list is for discussion of how to use various CAD programs, what programs are available etc. CAM(CNC), the list is for discussion of how to build modify or convert a machine for a Homeshop CNC machine, if you use it commercially good, but not on the list. Nor question about commercial shop problems. EDM, the list is again for building, converting, modifying an EDM machine for a homeshop EDM machine. DRO, same as above building, modifying, converting for use in a home shop atmosphere. Gentlemen, we have to go thru this same crap all the time, OFF TOPIC posts are just exactly that. This is not the place for all the other stuff. With over 2800 members, and about 50 posts a day, we just can't allow all the OFF TOPIC stuff, it would soon overwhelm the purpose of the group. You can all make my job as the List Mom a lot easier if you will help to keep the Spam down, and all Off Topic posts are SPAM on this list. The biggest complaint I get is about the Off Topic posts, and the most support I get is about stopping OFF TOPIC past. If you insist on posting Off Topic you will be either moderated or Banned, and the choice is Tim and my hands. Period........ Please don't answer this post on the list, address all replies directly to me or Tom only. anyone answering on the list will be put on a moderated or banned status. bill Your unhappy List Mom |
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New Rudex plasma drive board
Steve Tate
Has anyone checked out the new Rutex plasma CNC driver
board? It looks like it has some nice capibilities. I'm thinking about buying one, but could use some feed back from those better informed than myself... Steve __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Re: query - 2HP PM DC motor controller - pointers please
RichD
Tom,
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These are PWM controlled full wave SCR rectified straight from the AC line. Torgue and speed regulation is taken from the back emf of the motor. These are killer drives. I highly recommend them. KB Electronics and Minarik are two manfs of excellent drives. These are for DC motors what VFD's are to 3 ph motors. Some units will accept 120 or 240 VAC giving 90 or 180 DC out. The motor volts does not have to be closely matched. RichD ths992001 wrote:
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Re: query - 2HP PM DC motor controller - pointers please
--- In CAD_CAM_EDM_DRO@y..., "Jan Kok" <kok@s...> wrote:
How does one get 90VDC from 110VAC?I have been wondering about this for a long long time... The 90vdc drives that I have seen have no transformer, just SCRs. I suspected half-wave rectification: 120*sqrt(2)~=170, and half of that is 85 (this is simplified, but it works out in RMS too) But I understand that drawing DC from an AC power line is not a good idea. So how does it really work? Tom Scarince www.thsengineering.com |
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Re: query - 2HP PM DC motor controller - pointers please
If it is a dc servo type motor then it may not have a fan and be sealed
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(don't rely on the sealing as it may not be fully sealed.) You should be able to run it stalled at rated current for ever as long as it does not have a shaft mounted fan nor is it supposed to be fan cooled by a separate fan. Regards Peter ----- Original Message -----
From: "Jan Kok" <kok@...> To: <CAD_CAM_EDM_DRO@...> Sent: Saturday, October 26, 2002 9:50 AM Subject: [CAD_CAM_EDM_DRO] Re: query - 2HP PM DC motor controller - pointers please provideFrom: "tedinoue" <etinoue@...>... much cooling at low speeds.1 rev/sec), the current will go through a single winding for a long time,thus all the heat is concentrated in that one winding, possibly leading toaol://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: CNC'd drafting machine?
Hey Carlos,
Actually, I did. Its called a plotter. <gr> Seriously, I needed a plotter for some large drawings I needed to print and as I had the motors and drives already...... It's an Allbrit machine that I used 3/8-24 allthread to drive the motion. All told, it cost me about the same to do this as getting 5 copies printed out. Works well, but it sure isn't overly fast. Iain Carlos Guillermo wrote: --snip-- |
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Re: Center tapped transformer
tommoser3246
What is NAMES and when and where is it held?
Thanks, Tom --- In CAD_CAM_EDM_DRO@y..., Matt Shaver <mshaver@e...> wrote: On Wednesday 23 October 2002 03:17 am, you wrote:and throughMatt,Since every other aspect of this subject has been covered through by now, I guess the only thing I can add is that I'm doing OK!Actually, I've been working on some stuff I'd like to exhibit at NAMES this year.I'm CNCing another Sherline mill (5400) and a lathe (4400), and I'm reallyhoping to demonstrate single point threading on the lathe and rigid tappingon the mill using the EMC. Wish me luck... ;)like to know if anyone's interested in a CNC/CAM software get-together/discussion, especially the TurboCNC and Master5/Mach1 authors... How aboutBallendo & his book? |
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Re: Possible OT vacuum chuck for CNC?
In a message dated 10/26/2002 7:49:01 AM Central Standard Time,
mfraser@... writes: . . . does anyone have some experience or suggestions for vac hold-down ofMark! If your engraving forces are not too great, then the method I use for PCB-hold down, and SOME light engraving is to use 3M "Wallsaver" Poster Tape. AKA "Removeable/reuseable double-stick tape". Their retail price is OUTRAGEOUS (about 3? per linear inch of the 3/4" wide stuff), but it works very well for this, and is "clean". Jan Rowland [Non-text portions of this message have been removed] |
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Re: Single point cnc threading
Matt, I have not used EMC for several years now so I was surprised to
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see that EMC could do single point threading. How are you doing it? Dan -----Original Message-----
From: Matt Shaver [mailto:mshaver@...] Sent: Saturday, October 26, 2002 12:46 AM To: CAD_CAM_EDM_DRO@... Subject: Re: [CAD_CAM_EDM_DRO] Center tapped transformer On Wednesday 23 October 2002 03:17 am, you wrote: Matt,I'm CNCing another Sherline mill (5400) and a lathe (4400), and I'm really hoping to demonstrate single point threading on the lathe and rigid tapping on the mill using the EMC. Wish me luck... ;) Matt |
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Re: Mach 1 Computer was: Capacitors for Geckos when using fuses
turbulatordude
Make sure you have the distances or steps per rev set properly.
if you have Mach1 set for 1,000 steps per rev and TurboCNC set for 3,000 you will see the speed faster in Mach1 strictly and only for that reason. Of course the table will move different distances when you tell it to move one inch. ditto for accel and max rates. in TurboCNC it is in the MAIN menu ( 1st screen) 4. Setup machine configuration. 4. Motion setup. In Master5, you can put in your stepper SPR and gearing ratio to let the program set it. I assume it is the same in Mach1 The test is to run an inch. if it does then you're good. btw, on TurboCNC, I just kept upping the accel and max speeds until the motor started loosing steps, then I backed off 20% works fine and is fast enough for me. Dave <snip> 2- 3 times faster than Turbocnc. But Im not really sure as I am new tothe reason why Mach1 seems to perform smoother.<snip> |
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Re: using servo motors w/encoders for my DRO??
In addition to emc, deskncrt together with the Mauch/Kulaga DRO board
will take your encoder signals and process them as a dro with just using the encoders mounted on servo motors but that portion of the display is pretty small. If you want I can email you the Kulaga software that uses a PC monitor as the display so you can see it. Dan mueller914 wrote: With my servo controller turned off, is it feasible to use theSure. |
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Possible OT vacuum chuck for CNC?
Mark
I know these are used for laser-cutting and engraving, and there are
a few combination magnetic and vac chucks around, does anyone have some experience or suggestions for vac hold-down of something like a brass plaque for engraving, or for even smaller footprint objects for machining? / thanks / mark |
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OFF TOPIC Possible OT vacuum chuck for CNC?
Please remember anything other than building our machines, doing the drafting
and control of them is OFF TOPIC for this group. This groups purpose is not on how you do the machining later, but how to get the machine built, and running. I realize this sounds very terse, and narrow, but with over 40 posts a day things would soon get out of hand. Please help me to keep this group down the narrow path for which it was designed. I really don't want to moderate or ban people but I will if necessary. The value of this group has been to get people together to help each to build or modify. There are general machine groups for the machinists sides of the operations later, such as speeds, vises, etc. PLEASE NO MORE POSTS ON THIS SUBJECT. ALL COMMENTS DIRECT TO ME OR TIM bill List Mom WANLIKER@... 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. |
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Re: query - 2HP PM DC motor controller - pointers please
Jan Kok
From: "tedinoue" <etinoue@...>... 1) I've seen a lot of postings discussing 90v DC from 110v AC andHow does one get 90VDC from 110VAC? By using a switching power supply, or PWM? (In which case there is nothing magic about 90V, you could get any amount of DC up to sqrt(2) * 110V minus a few volts for various losses.) 2) If I do run it at 90VDC, that's 3/4 of 120VDC, so would I simplyThe current drawn by a DC motor is proportional to the torque that is generated. The speed of a DC motor is proportional to the voltage across the motor terminals minus the voltage drop through the resistance of the motor windings and brushes. You can use the full torque (full current) at any speed (voltage). One thing to watch out for is that the motor has adequate cooling if running at low speed and high torque, because the heat generated is proportional to the current, but the built-in fan won't provide much cooling at low speeds. I haven't seen mention of this elsewhere, so maybe it isn't a concern, but if you operate a DC motor at full torque and stalled or nearly stalled (< 1 rev/sec), the current will go through a single winding for a long time, thus all the heat is concentrated in that one winding, possibly leading to overheating of that winding. If the motor is intended for servo applications, this should be accounted for in the ratings, but otherwise, you may want to limit the current to less than the rated current if the motor will be operated in high torque and stalled or near-stalled conditions. Cheers, - Jan |
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Re: Center tapped transformer
Matt Shaver
On Wednesday 23 October 2002 03:17 am, you wrote:
Matt,Since every other aspect of this subject has been covered through and through by now, I guess the only thing I can add is that I'm doing OK! Actually, I've been working on some stuff I'd like to exhibit at NAMES this year. I'm CNCing another Sherline mill (5400) and a lathe (4400), and I'm really hoping to demonstrate single point threading on the lathe and rigid tapping on the mill using the EMC. Wish me luck... ;) Matt P.S. Who's going to NAMES this year? I know it's early yet, but I'd like to know if anyone's interested in a CNC/CAM software get-together/discussion, especially the TurboCNC and Master5/Mach1 authors... How about Ballendo & his book? |
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