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Questions to make a CNC Router
Questions to make a CNC Router
Is it OK to drive the rack and spur gears, just with the motor without an belt reduction? Does the motor from the Z axis must be the same size as X,Y? Raul __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Re: Speaking of encoders....
Chris and Dee
I thought I was violating list rules so I tried to be as brief as
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possible. Turns out I'm OK! :-) I created this webpage for pics and all the details I have: Thanks! -Chris --- In CAD_CAM_EDM_DRO@y..., C.S. Mo <cs@v...> wrote:
Any pictures? Pricing? |
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Re: CNC drill sharpening
turbulatordude
I have a couple custom shops here in the phila area. they will take
blanks of the material and make what you need. Figure $30 to $50 for set-up then $5-$10 for the blank (1/4 carbide ?? x 3" long??) then some $$ for the work. it gets cheaper the more you have done at one time. The first is usually about $50.00 You can save a dollar or two if you use coblat and another 50 cents if you use HSS, but why ?? at $47.50 for HSS or $48.00 for Cobalt or $50.00 for carbide. Obviously, the larger dia the bit, the more time grinding and the more $$$ for the blank. Dave --- In CAD_CAM_EDM_DRO@y..., "Sean Trost" <seantrost@n...> wrote: Hello !router bits to be made. Only one shop here in Fayetteville NC will even talkto me about producing them and I suspect that the quote is gonna be inthe three figure range.willing to lend a hand ? I would pay for materials and beer/dinner money ofcourse. for normal carbide. Somesharpeners and too small. something ifdown to #80, others to 1 1/2" diameter. They would be worth by hand.they were accurately sharp. And yes, I can sharpen the big ones And theBut how much better would they work if the accuracy was higher? closelittle ones I've had inconsistant luck with. Not good enough for reach it iftolerance work.aol://5863:126/rec.crafts.metalworking or go thru Google.com to you have trouble.as a sister site to the CCED group, as many of the same members arethere, for OT subjects, that are not allowed on the CCED list.POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ |
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CAM Software Options?
natchamp_87
While I'm waiting to find the right machine for my cnc retrofit, I
thought I'd start playing around with the software. So far I have download TurboCadCam which does both. I want to take a look at some of the other CAM solutions available. Any recomendations where I can download some eval copies? I am a beginner but kind of a an E-geek anyways so ease of use, as well as functionality are important. Mark www.mark.hargett.com |
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Re: polymer concrete
Brian
Hi bill, well the base of the machine after filling with polycrete weighed
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just over 10 tons. it was a welded structure with rounded gussets and several layers of open bottom drawers so to speak. bottoms smaller than top. They poured up to the first level, vibrated to remove air, then secured a polyethelene faced door with a strap clamp, moved the pour up to the top. each time they got to a door it was closed and sealed the same way. The box rails without ways on top were supported evenly with gusseted framework. part of the reason for this fancy design was so the whole head assembly could rest on the framework untill the pour cured. then the head was lifted, the box top was scraped and the ways set. head was lowered onto the ways. Looking and thinking about that design i see no reason why a very light frame could be made and after pouring setting rails like thompson makes should be quite easy. I do not know the price of the stuff tho, Less Watts should tho!?! for small stuff even if the rail was just iron, and ground and scraped after casting should be super stable...A printing co. i worked for used to set iron and brass castings at a seasoning yard out in the weather for about 3 years, sometimes more just because of supply or demand. I bought a new unseasoned casting and used it for a boat anchor for 4 years, then they asked if i still had it, needed a casting to build one more machine. yep its a machine now..even when seasoned, it still can move around when being machined..if the body of the machine is a cured casting on a frame it would be hard to move, good stability even if you machined it!!! cul brian f. --Original Message -----
From: "William Scalione" <wscalione@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, October 20, 2002 3:50 PM Subject: Re: [CAD_CAM_EDM_DRO]polymer concrete theHi, well i am no expert but the machine i saw being built they poured wasurethane/concrete like material into the machine once it was at the awhenbase of Urethane, stone powder and some type of emulsion binder to keeptheviscosity even till it was set-up. The small piece i had didnt bounce materialstossed to the floor but more of a flap-n-thud sound. You really couldnt frame.and ask to see how it is used. Maybe they will tell you who's materialtheyuse. cul brian f.Brian, Seems like if this could be done, we could come up with a design for thelike it would make a nice machine, Desktop size, maybe 8 X 12 working envelope.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........
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Re: Motor Brackets
Marv,
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Yep I can read dwg's, I'd really like to look at the drawings, Thanks Phil -----Original Message-----
From: Marv Frankel [mailto:dcdziner@...] Sent: Monday, October 21, 2002 2:11 AM To: CAD_CAM_EDM_DRO@... Subject: Re: [CAD_CAM_EDM_DRO] Motor Brackets Phil, You can see pictures of motor brackets, not with timing belts, but direct drive, at www.matronics.com/cnc2/ . I also have an AutoCad drawing that someone posted on the net, of a geared down motor mount using timing belts. If you can read an Acad R14 DWG file, I'll be glad to email it to you, or tell me what format you'd like, and I'll send it to you. I think the guy who designed this gearbox also has some pictures posted, but I don't remember where. Marv Frankel Los Angeles ----- Original Message ----- From: "Phil Whittingham" <philw3@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, October 20, 2002 3:15 PM Subject: [CAD_CAM_EDM_DRO] Motor Brackets I'm starting to look at designing motor brackets for my millaol://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........
URL to this group: Addresses: FAQ: FILES: 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 as 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........ 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: bill, List Mom List Owner Your use of Yahoo! Groups is subject to |
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Re: Resolvers vs Encoders
doug king
Jon Elson <elson@...> wrote:
doug king wrote: Hi.I have an old HNC Hardinge that I believe has resolvers.Do I have to change 'em out?I'd love to stay cheap and get function from this beauty if'n I can...Thanks,DougWell, it is a cost comparison. How much space is available. (Actually, most resolvers are bigger than modern optical shart encoders, so size is not likely to be a problem.) So, it boils down to how much would shaft encoders of suitable resolution cost, vs. how much does a resolver to quadrature converter cost? Jon Addresses: FAQ: FILES: 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 as 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........ 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: bill, List Mom List Owner Your use of Yahoo! Groups is subject to ve access to tons of surplus goodies,thru a friend.What kind of encoders would work with anHNC?Thanks,Doug --------------------------------- Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Re: CNC drill sharpening
Sean Trost
Hello !
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I have a request, I have a requirement for a small quantity of router bits to be made. Only one shop here in Fayetteville NC will even talk to me about producing them and I suspect that the quote is gonna be in the three figure range. Would anyone have the capablity to turn HSS steel and would be willing to lend a hand ? I would pay for materials and beer/dinner money of course. alll the best Sean Trost ----- Original Message -----
From: "Elliot Burke" <elliot@...> To: "CAD_CAM_EDM_DRO" <CAD_CAM_EDM_DRO@...> Sent: Monday, October 21, 2002 12:05 PM Subject: [CAD_CAM_EDM_DRO] CNC drill sharpening How about this: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........
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microstepping torque
Hi all,
I've a question about microstepping. If I look at the speed vs. torque diagram, the steppers I'm using have a torque of 3 Nm (460 0z/in) at 5000 Hz. This in half step mode, if use microsteppers what happens with the torque. With microsteppers I use 5 times more steps for the same revolution, so at 5000hz the microsteppersriver is sending 25.000 steps. The torque at 25.000 Hz is pretty low. So basicly the questions is how does microstepping inflect the torque? Thanks Hugo |
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Re: Speaking of encoders....
Any pictures? Pricing?
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--C.S. Sorry for the spam but I figured while we were on the topic of |
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Speaking of encoders....
Chris and Dee
Sorry for the spam but I figured while we were on the topic of
encoders some people might be interested. I happen to have a bunch of encoders that I picked up for a DRO project I had planned and have decided not to proceed with. They're EX15 chassis encoders, 1000 count, 3 channel. Ball bearing, etc. Pretty well built. If anybody is interested email me offline. Sorry for the spam! -Chris |
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Re: Resolvers vs Encoders
We always used rotary brushless resolvers on machine tools which were
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originally developed for the military and hence fairly robust. They have one other advantage that they are absolute devices for one revolution. For most applications full travel of the machine will be a few tens of revolutions. We used the 2500Hz excitation frequency types and managed to get reasonably good performance and accuracy. The circuitry for using them is fairly simple using counters and comparators to energise and extract the position. Regards Peter ----- Original Message -----
From: <w.higdon@...> To: <CAD_CAM_EDM_DRO@...> Sent: Sunday, October 20, 2002 10:39 PM Subject: Re: [CAD_CAM_EDM_DRO] Resolvers vs Encoders I'll try, altough Jon, could probaly do better.heard fromthe terms mentioned, especially in regard to Hardinge machines. thanthat era out there available for very little money...certainly far less youbuilding from scratch or retrofitting a manual machine...especially when if youconsider that the enclosures, the coolant pumps, the ballscrews, the way sister sitehave trouble. subjects, thatto the CCED group, as many of the same members are there, for OT DON'Tare not allowed on the CCED list. POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it ifAddresses: 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........
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Newbie Questions
I'm pretty new to machining, so please forgive me if my questions have
already been re-hashed ad nauseam. I have a Rong Fu Geared Head Mill/Drill from Enco. So far I've only made one part! (nothing about machining until the very end) At any rate, I've discovered that I really can't stand using the dials and I want to reduce the backlash of the machine. I've also started working on converting the machine to CNC. So, here's my questions: 1) I have roughly .015" backlash in my X and Y travels. I've heard talk about "double-nutting" in order to reduce backlash. Has anyone done this to one of the little Mill/Drills? Any advice on how to go about doing it? I've considered going to ball screws but my understanding is that ball screws make it so that the machine can not be used for manual milling - is that correct? 2) Judging by others' comments, it appears that one of the biggest disadvantages to the little Mill/Drills is that you lose your position when you move the head up and down. Has anyone done anything to address this? 3) I don't expect to have the machine converted to CNC anytime in the near future, in the meantime I'd really like a DRO for at least the X and Y axis. The least expensive method (once you factor in the cost of the PC/Monitor..etc) and the quickest to get setup seems to be to use digimatic scales (the ones that are kind of like digital calipers without the caliper part) with SPC output to an external 3-axis readout. WTtool sells the readout for $249 and the individual scales are available for roughly $200 for three, so call it $500 once I make the brackets/shipping..etc. The disadvantage to this is, as far as I know, I can't get the SPC outputs into a PC. I'm planning on using servo motors (already have two) with Gecko drives for my CNC upgrade. The servo motors have encoders attached so in a sense the external DRO would be redundant. So, I *could* get the X/Y motors hooked up (which has a lot of other advantages, but will be very expensive because all of a suddenly I will have my credit card out and will be calling Gecko for drives, and getting a power supply and...and..and..) and use the encoders on the motors with one of the free DRO software utilities. One disadvantage to this is the servo encoders will have to compensate for backlash which may or may not be a problem. I assume it isn't a huge problem because it appears to be common practice. The other method would be to build my own rotary-to-linear encoder system which certainly has appeal and could have better resolution than either of the two previous methods. However I don't know that it is necessary... So, bottom line, is there an advantage to having two DRO systems on a single mill? If I put on a digimatic scale system will I end up junking it once I get my CNC stuff completed? Thanks! --C.S. |
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Selling on the list
In a message dated 10/21/2002 3:38:34 PM Mountain Daylight Time,
cs@... writes: Any pictures? Pricing? You are allowed to offer items for sale on the list. No catalogs. Buyers should address all questions direct to the seller, remember everything goes to the archives forever...... Sellers please be sure to post everything in the first post, including price. And add line: "Please contact me off list" and your email address. Thanks, bill List Mom |
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Re: CNC drill sharpening
Yo Elliot;
For a setup that would work on either a mill, or a drill press, how about a grinder bit in a Jacobs chuck, and on the table, a rotary table mounted on a sine plate? On a drill press it would bw a little tricky without an xy table, but should be do-able, by eye. Of course some of us would need a pair of those frog-eyed magnification goggles, made by the Nippon Coke bottle bottom and optical company.....:-) Bill On Mon Oct 21 09:05:14 2002, Elliot Burke, <elliot@...> wrote: How about this:-- ---------------------------------------------------------------------------- RKBA! Blessings On Thee, Oh Israel! 4-19! ----------------+----------+--------------------------+--------------------- An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no weapon in every | by COLT; | -- Max Plank | weapon sell his hand = Freedom | DIAL | In the beginning was the | garment and buy a on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ ----------------+----------+--------------------------+--------------------- Constitutional Government is dead, LONG LIVE THE CONSTITUTION!!!!! ---------------------------------------------------------------------------- |
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Re: Resolvers vs Encoders
doug king wrote:
Hi.I have an old HNC Hardinge that I believe has resolvers.Do I have to change 'em out?I'd love to stay cheap and get function from this beauty if'n I can...Thanks,DougWell, it is a cost comparison. How much space is available. (Actually, most resolvers are bigger than modern optical shart encoders, so size is not likely to be a problem.) So, it boils down to how much would shaft encoders of suitable resolution cost, vs. how much does a resolver to quadrature converter cost? Jon |
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Re: Resolvers vs Encoders
doug king
Hi.I have an old HNC Hardinge that I believe has resolvers.Do I have to change 'em out?I'd love to stay cheap and get function from this beauty if'n I can...Thanks,Doug
Jon Elson <elson@...> wrote: Marcus & Eva wrote: Hi All:Resolvers use varying magnetic coupling to provide signals which vary in amplitude (and have a sign, ie. + or - phase relationship). A sine wave excitation is applied to one winding, and sine waves are produced on 2 other windings, which vary in amplitude as the resolver is rotated. Interpolation is used to obtain higher resolution information than the raw quadrature cycles inherent in the output. Most encoders today are optical, with LED light sources. back in the days before LEDs, encoders were considered unreliable, because the light bulbs would burn out. Most encoders in modest systems, especially home CNC systems, are used at their inherent resolution, and not interpolated. What is the implication for machine performance?Not much. but, a device to read out position from a resolver is more expensive, maybe MUCH more expensive, than what is needed to read position from an encoder Is a retrofit from resolvers to encoders a worthwhile effort?I did it on my machine. So, yes, I'd consider it worthwhile. When did resolvers go out of favour and why?I don't know if they are "out of style", as some large machine builders still use them. I'm casting amorously about, for small CNC turning centers, and I've heardCertainly. Don't let a resolver-equipped machine scare you off. It will probably be cheaper to retrofit with encoders as part of the CNC controller retrofit. It is possible that there are black-box resolver converters in the CNC machine that can be used with the new controller, though. If so, then you would not need to pull the resolvers. Jon Addresses: FAQ: FILES: 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 as 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........ 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: 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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Re: Motor Brackets
Yo Marv;
I don't know if QCad will read it or not, but lets give it a try. Bill On Mon Oct 21 05:16:55 2002, John Guenther, <j.guenther@...> wrote: Hi Marv,-- ---------------------------------------------------------------------------- RKBA! Blessings On Thee, Oh Israel! 4-19! ----------------+----------+--------------------------+--------------------- An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no weapon in every | by COLT; | -- Max Plank | weapon sell his hand = Freedom | DIAL | In the beginning was the | garment and buy a on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ ----------------+----------+--------------------------+--------------------- Constitutional Government is dead, LONG LIVE THE CONSTITUTION!!!!! ---------------------------------------------------------------------------- |
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CNC drill sharpening
How about this:
sharpen drill bits in a 4 axis mill or lathe with spindle encoder. It might be possible, just move everything just so. More of us have CNC equipment than fancy drill sharpeners. I'm particularly interested in the drill sizes that are too big for normal sharpeners and too small. Have lots of little drill bits that are dull, some of them carbide. Some down to #80, others to 1 1/2" diameter. They would be worth something if they were accurately sharp. And yes, I can sharpen the big ones by hand. But how much better would they work if the accuracy was higher? And the little ones I've had inconsistant luck with. Not good enough for close tolerance work. Has anyone tried this? Elliot B. |
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