Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- CAD-CAM-EDM-DRO
- Messages
Search
|
Re: 1850 oz-in NEMA 42 motors; have data sheets now
In a message dated 3/9/00 10:08:07 PM Mountain Standard Time,
multi-volti@... writes: << I have located and am brokering some Sigma new surplus 3-stack NEMA 42 steppers. >> Please conduct all business, including offer to sell off list in the future. Thanks, bill |
|
Re: phase converter
Drew Rogge
Rich,
I didn't ask the initial question but would like to thank you for the dirt simple answer. Does it matter which of the motor windings the 240 and 3 phase stuff is connected to? Drew On Mar 9, 4:45pm, R. Dean wrote: Subject: Re: [CAD_CAM_EDM_DRO] phase converter -- Drew Rogge drew@... |
|
Re: phase converter
No, pick any two. If the 3 phase motor on your tool runs in reverse,
toggle quoted message
Show quoted text
swap any two wires going to the motor. ------------\--------------------- \ 220 3 ph ________________ 3 phase motor to tool motor / -------------/--------------------
--
Paul Amaranth | Rochester MI, USA Aurora Group, Inc. | Systems & Software paul@... | Unix / Windows / NT |
|
Re: DRO ENCODER TOOL
Terry May
Tom,
I did remove the clip first by using one of those "dental pick" type tools to lift up on the internal tabs until I could get underneath it with a pair of long needle nose pliers. On my motors there is a very shallow groove on the shaft. It's above the ring, but I was concerned the tabs would lock into that groove if I left it on. Terry --- In CAD_CAM_EDM_DRO@..., Mike Gann <mikegann@h...> wrote: also do rotary encoders which are necessary should you wish to go over 360 in quarture. are beating this sure) a fair> to death. All this discussion has saved me (and others, I'm using linear> amount of cash. I just finished installing DRO on my mill cost.> encoders for $150.00. Now with the tips from you, Art using your> wedge tools> tool? Goldmine> I discussed earlier to remove the encoder disc from the the> electronics servo motors. The tool worked very well removing the RCM> encoder and not damaging the disc. web> dropbox today (DRO_Tool.jpg, etc.) since I don't have my own ------------------------------> site. Hope they are useful to someone. ------------------------------> GET A NEXTCARD VISA, in 30 seconds! Get rates as low as 2.9% for the discussion of shop built systems in the above catagories.> changes there.> To Unsubscribe, read archives, change to or from digest. --------------------------------> For the FAQ, go to -------------------------------- the discussion of shop built systems in the above catagories.Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for changes there.To Unsubscribe, read archives, change to or from digest. --------------------------For the FAQ, go to --------------------------DON'T HATE YOUR RATE! the discussion of shop built systems in the above catagories. changes there.To Unsubscribe, read archives, change to or from digest. For the FAQ, go to |
|
Re: Servo Dynamics Amps web page
George Fouse
Hi John,
toggle quoted message
Show quoted text
Just tried it ... No DNS problems and the server responded fast. Suspect a transient DNS problem somewhere, now resolved. George John Ross wrote:
--
------------------------------- George Fouse, President G F I Consulting ------------------------------- |
|
Re: phase converter
R. Dean
Joe, It is quite simple. Connect your 240VAC across two of the motor
windings. Connect the 3ph load circuit across those two windings and the third leg. With the 3ph load switched off and the 240 1ph on, pull the shaft cord to start (which ever direction suits you) then switch on the 3ph load. Once you get that going we can tell you how to add a dirt simple self start circuit. Much safer. Rich Dean Joe Vicars wrote: -- ///// (o)-(o) -----ooO---(_)---Ooo-------------------------- Rich Dean |
|
Re: DRO ENCODER TOOL
Mike Gann
Thanks James,
toggle quoted message
Show quoted text
I knew about US Digital. I was hoping this was something else, as I was looking for a little higher resolution linear encoders. (cheap) Thanks Mike james owens wrote:
|
|
Re: phase converter
For you folks pondering 3-phase converters, I give you here a link to an
article by a machinist/electrical-engineer-wizard who is a member of and past-president of our local Home Metal[workers'] Shop Club. It is full of accurate and potentially-useful information. In a previous life, I built pipe-organs, mostly wood-working, and they generally used 3-phase blowers, sometimes powered off a single-phase line, using a capacitor-only for the third phase. All the machinery was 3-phase. So, I kinda got to know a little about that. In a word: If it is POSSIBLE to do it with a 3-phase motor, DO IT! When we moved here in '85, with the intent I'd build a "home shop" with a 1340 lathe and "Bridgeport", plus full woodworking machinery (yes, a bit ambitious for a home-shop, but, well, it gets used rather continuously, making pocket-change!) I made sure the local power-company would hook me up to 3-phase "off the pole", and, to make a long story short, After a payment of $1550 to enlarge the transformers on that pole, I am the only "residence" on the block with 3-ph., and I have recently heard they will now NOT supply 3-ph. for any price to a residence. Guess if iron-lungs run only on 3-phase, you have to buy funeral insurance... IF the power-company will supply you with 3-phase, even for $2000, DO it! |
|
Re: Source for linear encoders?
In response to the person looking for cheap linear encoders, US
digital sells linear strip at $2/inch ($14 minimum) which works with $30 or so HP reader heads. The resolution is 360 cycles per inch, which works out to 1440 counts/inch. That does meet your goal of 'better than 1000', but it's not better by a nice round number. Still for many hobby applications it is far better than nothing. Chris -- Christopher C. Stratton, stratton@... Instrument Maker, Horn Player & Engineer 30 Griswold Street, Cambridge, MA 02138 (617) 492-3358 home/shop |
|
Re: DRO ENCODER TOOL
Mike Gann
Tom -
toggle quoted message
Show quoted text
What was the resolution of your linear encoders and where did you buy them? thanks Mike "SMITH, THOMAS B. (JSC-DX)" wrote:
|
|
Re: DRO ENCODER TOOL
SMITH, THOMAS B. (JSC-DX)
Terry,
The pictures are very useful, thanks! And don't think you are beating this to death. All this discussion has saved me (and others, I'm sure) a fair amount of cash. I just finished installing DRO on my mill using linear encoders for $150.00. Now with the tips from you, Art and others, I can do the same for my lathe for a tenth that cost. One more question...did you remove the retaining clip before using your tool? Tom Message: 10 Date: Thu, 09 Mar 2000 00:26:49 -0000 From: "Terry May" <tmay@...> Subject: DRO ENCODER TOOL At the risk of beating this subject to death, I made the wedge tools I discussed earlier to remove the encoder disc from the Goldmine electronics servo motors. The tool worked very well removing the encoder and not damaging the disc. I put a couple of pictures of the wedges and the usage into the RCM dropbox today (DRO_Tool.jpg, etc.) since I don't have my own web site. Hope they are useful to someone. Terry May <<<<<<<<<<<<<< |
|
RFQ, Linux/EMC system
Jon Anderson
I've just taken a major step towards a real servo CNC system. I scored
an industrial robot at a price I couldn't pass up (free). There is no info on the servo motors that I can see, but the power supply cabinet has two very nice Yaskawa servo amps with a really nice power supply setup. I'm thinking of trying to off the robot itself and use those funds to buy a couple servo motors and encoders to suit my Bridgeport. Goal is to just CNC XY for now. However, I really don't have time to mess with Linux/EMC right at the moment. Several folks here have floated the idea of building a complete system. I'd like to request quotes from those interested and qualified, to build me a computer complete with Linux, RT, and EMC, setup and verified as operational. I would supply the STG card, but would ship it to you for testing. This would be something along the lines of a P166/200, CD, 1.44 floppy, couple gig HD. I've got a monitor, keyboard, and would buy whatever mouse or trackball was needed. Given the environment, I think I'd prefer a trackball if drivers are available. I'm not ready to do this just yet, trying to piece together what it's all going to cost first. Please respond privately to mailto:jon@... Thank you, Jon |
|
Re: Power Feed, something different,
Hello Terry,
toggle quoted message
Show quoted text
Welcome to the ranks of a participating member of this list!! I think you will find a tremendous amount of help and support here and will never find that the list is short of opinions or suggestions. It sounds as if you are feeling a little overwhelmed by this whole CNC thing. If there are specific areas that are causing you problems just post it to the list and we will all try to get you through them. This post seems a little vague on the area we can provide assistance with. Regarding the encoder wheel on the shaft problem, I have enjoyed the thread and found it interesting. You have to understand that what we are trying to remove is a disc 2" in diameter that is about .005" thick and has 1000 slots near the outer circumference. If you just look at them crooked you can bend the slots or warp the disk. To make it harder they are bonded to the shaft with a epoxy like substance. Welcome aboard, Tim [Denver, CO] timg@... <mailto:timg@...> P.S. you might want to look over my website as it chronicles some of my CNC adventure. Also check out Camtronics at and read Dan's Secrets of CNC. From: "james owens" <wotisname@...> |
|
Power Feed.
The nice thing about starting the CAM route by setting up manual power feed
first, is that you can do only one axis at a time. The drivers require a step signal, and a direction signal to operate the steppers, the step signal can be a simple 555 oscillator circuit, the direction is simply a voltage or lack of same to determine direction. So you would have one switch for direction, one potentiometer for speed, When you get read to convert to CAM, these could easily be used for manual tramming, and use the CAM program for the machine. This way you can use your machine for conventional milling while you are converting it I gave Camtronics URL earlier, I have no interest in the business. However I would like to also point out that he does have steppers, and mounts complete with bearings and connector for $33 a set. They are some very nice looking units. He also has smaller drivers for the steppers available at the same site, that would be perfect for the Sherline owners. And the price is good. If you are not interested in CAM operation, then stop and have power feed on any axis, stop the long cranking sessions. Thoughts, bill |
|
Re: Step motor current
Ron Ginger
Thanks for the notes. I guess the 'hand hold' test is not a good measure
of motor heat. Must be why measuring instruments are used :-) My driver module has a pin that controls current and a table of R values to set. I tried lowering the current to 3A, and they still worked fine, then I lowered it to its lowest possible value- 1.5A I think, and the motors still runs just fine, and barey get warm after 15 minutes of operation. Using Maxnc I can drive them at 10" per minute without loosing steps- plenty fast for a mini mill with a travel of only about 8 inches. On the suggestion of manual feed, I had planned to do that as well. Even if used just to setup the table it seems easier than needing software and comand keys. I plan to just add a simple switchbox with a pot and push button on each axis. Tonight I should try to make my first real part on the mini. ron |
to navigate to use esc to dismiss