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Re: microstepping torque
Hi Jon,
I use indeed pretty big steppers maximun holding torque is something like 8.5 Nm, there also hybrid steppers. I don't know the diffenence between hybrid and normal, but the curve (speed vs torque) of hybrid steppers are more stretcht out, so they have more torque at high speed. I have them run at 50.000 Hz, so that 1500 rpm, I use this for rapid feed only. All this is, as you mentioned, holding torque. Thanks for your feedback. Hugo steppers --- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote: what revolution,happens with the torque. torque?so at 5000hz the microsteppersriver is sending 25.000 steps. The observed 3Microstepping should not affect the torque. Have you actually Nm at 5000 half-stepsgeneral, most steppers lose athey must have holding torquethis regard, though.)supposed to be that you get |
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Re: Ideas for matching drives on a YY axis design?
Jim Brown
Just curious............
Why cant you just space out the linear bearings on the z/y axis' so it will have less of a chance of binding when traversing in the x axis, and drive it from the center with the ballscrew/leadscrew? I realize that this will be a big feat to perform, being the width of the gantry. But It can be done, cant it? Regards, Jim caudlet <tom@...> wrote:Group: Here is the basic design. Moving gantry table 72" X 80" (outside) with twin ballscrew servo drives on the YY axis. Just got my Gecko 340's in yesterday and in reading the tuning instructions I started to think about ways to "balance" the two YY drives. The servos have 500 count encoder as well as tach feedback. What is the best way to setup the twin screws so they have the same characteristics? I have lots of test equipment (300Mhz Tek Scope, power supplies, scope current probe, function generator, etc). For those of you that have used and setup the Gecko's feel free to throw in your 2 cents! 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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Re: CAM Software Options?
j.guenther
IMHO the biggest problem with TurboCADCAM is the lack of documentation for
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the CAM functions AND the just plain s*^&^^y tutorials provided. It may turn out to be a nice product but the sure as heck need to spend some serious money on the documentation if they plan on getting any substantial piece of the CAM market. John Guenther 'Ye Olde Pen Maker' Sterling, Virginia -----Original Message----- |
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Re: CAM Software Options?
natchamp_87
Thanks Alan. I downloaded and am trying out CapsMill. From what
I've seen so far I really like it. It appears to be somewhat powerfull and user freindly. Thanks again! Mark --- In CAD_CAM_EDM_DRO@y..., "Alan Matheson" <hokianga@i...> wrote: Have a look at CapsMill and at Powerstation 2002. I also got anevaluation copy of TruboCADCam and gave up in disgust. I use TurboCAD v8 prof.as my drawing package but couldn't get the the CAM part to work well.some canof the other CAM solutions available. Any recomendations where I geekdownload some eval copies? I am a beginner but kind of a an E- reach it ifanyways so ease of use, as well as functionality are important.aol://5863:126/rec.crafts.metalworking or go thru Google.com to you have trouble.to be 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........bill |
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Re: Dumb question on the drilling of holes
Marv Frankel
Guys,
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I'm following this subject with great interest. One of the reasons I subscribe to this group, is to learn enough to convert my mill to CNC. I have been fabricating some parts on a mill, using the DRO, and have run into problems drilling holes. Using certain drill bits, many of the holes have come out oversize, and some completely out-of-round. Changing bits has helped, especially if I use a shorter length bit, but I'm going to investigate using the 135 degree, or other similar drills. I'm looking forward to a CNC conversion, when I intend to center drill the holes before using the correct drill bit. Marv Frankel Los Angeles ----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...> To: <CAD_CAM_EDM_DRO@...> Sent: Tuesday, October 22, 2002 12:05 PM Subject: Re: [CAD_CAM_EDM_DRO] Dumb question on the drilling of holes Hi Alan,the aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it ifAcademic Computing Services | enemy, only where they are. 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 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: Dumb question on the drilling of holes
Vector can also generate the G83 from the get go. Depends upon the NC object
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you are using. It is set up in the EMC configuration. You choose it on the NC Cycle menu. Tim [Denver, CO] It will also generate a following G81 with |
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Re: Dumb question on the drilling of holes
Alan Marconett KM6VV
Hi Alan,
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I've read that you DON'T want to center punch the holes for CNC, although you might want to make light "witness" crosshairs to mark their location. Best would be to always start with a center drill, then follow with the appropriate drill. The trouble with a punch mark if not EXACTLY where you want it, is that it will pull a drill bit off. If the CNC has moved to the proper location, then you just want to drill where you are! To position the mill to a hole's location, set up a "wiggler" in the spindle, and, using a magnifying glass if necessary, move it tho the crosshairs. Or, you might prefer to locate everything relative to a pair of edges (LL corner is often good), and let the CNC work from that. I like using the edges if it's a new part, and then let the CNC find the other points. I'm using Vector CAD/CAM, and if I put a point at each hole location, down at the depth I need for the center drill, Vector will do a move to a location ABOVE Z=0, and then a slow Z down to the required depth, center drilling it for me. It will also generate a following G81 with the coordinates, which I modify to G83 to actually drill the hole (I like the "peck" and "dwell"). I "comment out" the G83's with a '/' in the part program, and turn on "block deletes" on the controller program (DON'T FORGET!). With the center bit "touched off" in Z, I run the program with block deletes on. This way, the center drill drills all the holes I want. Then I replace the center drill with a drill bit of the required size (you may want to repeat the process with two or more drill bits), disable block deletes, and run the part program again. With block deletes disabled, the G83's will be run, and the holes drilled. OK, this may not work for a "PRO" shop with tool changers and the like, but it works fine for my Sherline's, and I assume it will work as well on my RF-31 mill (when I finally get it converted) and possible a lathe in the future. HTH Alan KM6VV P.S. You can set the Z depth to just "kiss" the stock with the center drill, and thus run a "verify pass" first, to check your program! Also, a "pen holder" in the spindle, and a piece of paper can give you re-assurances that you've programmed the Gcode correctly. I've taken to printing a 1:1 of the part and the cuts on paper (HP laser is not far off), and this also helps to verify setup, CLAMPS, etc. alan@... wrote:
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Re: Newbie Questions
Hi C.S.,
Firstly I have a concern about your band saw and mill stands. Although your welds look very good, you still should consider adding braces to the legs! As you raise and lower your saw head you're going to cause metal fatigue in those joints. This is especially going to be a problem if you convert your mill to CNC. Given that the inertia of the table will be repeatedly torquing your stand. All you need to do is throw in some 45-degree braces or the like. As for questions about the Rong Fu mill, there is a Yahoo group that specifically covers this mill. Go here: That's what I know! Now let's talk about what I don't know. I also have a Rong Fu mill drill ( RF31 ). Parts created zero and my CNC conversion knowledge is minimal. So, I'm sort of in the same boat as your self. I just started collecting tooling as I just got the mill a few weeks ago. But as far as indexing the head, I plan to do something along the lines of a laser from the head to the base rather than the popular head to the wall method. Problem with the later is I plan on building a stand with casters. I'm thinking of some kind of microscopic sensor of some kind. But haven't drawn any plans yet. Take a look at a program under development called Mach 1 formerly known as Maser5. Go here: And here: I'm not certain, but think Mach 1 will read your rotary optical encoders and give the readouts on your computer monitor. This in addition to acting as a software based controller for G code interpretation and motion control. Well that's about all I can think of for now. I hope you continue to enjoy your new shop! All the best, James --- In CAD_CAM_EDM_DRO@y..., C.S. Mo <cs@v...> wrote: I'm pretty new to machining, so please forgive me if my questionshave already been re-hashed ad nauseam. I have a Rong Fu Geared Headthe very end)dials and I want to reduce the backlash of the machine. I've also startedtalk about "double-nutting" in order to reduce backlash. Has anyone donethis to one of the little Mill/Drills? Any advice on how to go aboutdoing it? I've considered going to ball screws but my understanding is thatball screws make it so that the machine can not be used for manualmilling - is that correct?position when you move the head up and down. Has anyone done anything toaddress this?the near future, in the meantime I'd really like a DRO for at least theX and Y axis.without the caliper part) with SPC output to an external 3-axis readout.WTtool sells the readout for $249 and the individual scales are availablefor roughly $200 for three, so call it $500 once I make theknow, I can't get the SPC outputs into a PC.drives for my CNC upgrade. The servo motors have encoders attached so in asense the external DRO would be redundant. So, I *could* get the X/Ymotors hooked up (which has a lot of other advantages, but will be veryand will be calling Gecko for drives, and getting a power supplythe free DRO software utilities. One disadvantage to this is the servoencoders will have to compensate for backlash which may or may not be aproblem. I assume it isn't a huge problem because it appears to be commonpractice. system which certainly has appeal and could have better resolution thaneither of the two previous methods. However I don't know that it isnecessary... a single mill? If I put on a digimatic scale system will I end upjunking it once I get my CNC stuff completed? |
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Re: MSc Degree in Mech. Eng.
Alan Marconett KM6VV
Hi Semih,
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Congratulations! Have you published your thesis on the web? URL? A quick search for the title didn't find anything. We'd like to read it (I'd need English)! Alan KM6VV Semih Diken wrote:
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Re: Ideas for matching drives on a YY axis design?
deanc500
I have a machine with dual y motors and matching them didnt seem to be
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an issue. I just kept the tuning pots at approx the same place by eye and it works great. I dont think the tuning is that critical. In other words, close is good enough. Just a sidenote for those having trouble tuning G320's: My main problem was trying to get good rapid speeds out of the machine. My G320 drives would fault randomly at frequencies over about 25Khz. I need 40Khz+ to get 100 ipm travel speed. I finally booted the machine into "safe mode command prompt only" (yes dos safe mode doesnt load himem.sys or anything)and now I can reliably get 60Khz out of it. At those frequencies, it only takes a 2.1 ms glitch to fault the drives. Dean --- In CAD_CAM_EDM_DRO@y..., "caudlet" <tom@t...> wrote:
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Re: Dumb question on the drilling of holes
doug98105
Alan,
Use a spotting drill. Center drills are not good for spotting, too much likelyhood of breaking the tip off in the workpiece especially on imperfect drilling surfaces. If you don't want to go to the trouble of spotting the holes then use drill bits with points suitable for self starting. The most common of these is the 135 degree split point. Other proprietary drill points work well too, like the Winslow point and others of that type. Doug --- In CAD_CAM_EDM_DRO@y..., alan@s... wrote: Forgive me this seemingly dumb question, but how does aperson "drill" accurately placed holes under CNC control without first center-punching them.or just mill the hole via G02/03 command for shallow ones.Are "spotting drills" that better way ?of the Academic Computing Services | enemy, only where they are.Sparta |
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Ideas for matching drives on a YY axis design?
caudlet
Group:
Here is the basic design. Moving gantry table 72" X 80" (outside) with twin ballscrew servo drives on the YY axis. Just got my Gecko 340's in yesterday and in reading the tuning instructions I started to think about ways to "balance" the two YY drives. The servos have 500 count encoder as well as tach feedback. What is the best way to setup the twin screws so they have the same characteristics? I have lots of test equipment (300Mhz Tek Scope, power supplies, scope current probe, function generator, etc). For those of you that have used and setup the Gecko's feel free to throw in your 2 cents! |
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Re: Dumb question on the drilling of holes
caudlet
--- In CAD_CAM_EDM_DRO@y..., alan@s... wrote:
Forgive me this seemingly dumb question, but how does aperson "drill" accurately placed holes under CNC control without first center-punching them.Alan: I have used both methods in a manual mill setup with a DRO. I draw the part in CAD and have it display the XY cooridinates in the print. Because twist drills will "walk" prior to making penetration I start the hole with a 1/4" diameter NC peck drill, then switch over to the real drill and drill the hole. I have talked to several guys that just use the CNC table to peck drill all of the through holes then they drill them on a conventional drill press. I am converting my large Gorton to CNC and I plan to continue to first peck drill then go back and finish drill the final hole. On thicker material (> .375) I will probably manually drill the final hole so I can back the drills out and clear the chips. I find that using the DRO and first drilling a locator hole is faster and more accurate than center punching and drilling (they way I used to do it prior to the purchase of my DRO). |
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OT Metric mills bits?
OK, this is totally off topic and I am sure Bill will scold me for it.
I am looking for a source of metric sized end mills and ball end mills at a reasonably price. Are there any online suppliers in Europe that would offer these at reasonable prices? In the USA they are hard to find (particularly the ball end) and priced about double what a comparable sized inch sized cutter goes for. I am guessing that in most of the rest of the world the situation is the other way around and metric is easy to find and low cost and inch is expensive. Because this is OT please reply off list directly to timg@... Thanks, Tim [Devner, CO] All Sherline products at deep discount www.KTMarketing.com/Sherline |
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Dumb question on the drilling of holes
Forgive me this seemingly dumb question, but how does a person "drill"
accurately placed holes under CNC control without first center-punching them. I currently use a center drill to start the hole ( for deep holes ) or just mill the hole via G02/03 command for shallow ones. But it occurs to me that there's got to be a better way. Are "spotting drills" that better way ? Thanks in advance for any thoughts. Alan -- Alan Rothenbush | The Spartans do not ask the number of the Academic Computing Services | enemy, only where they are. Simon Fraser University | Burnaby, B.C., Canada | Agix of Sparta |
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Fowler Clinometer accuracy and theodolite, was Re: Mill needs levelers
Ken Garver <dunlapsville@...> writes:
Subject: Re: Mill needs levelers> Starret and Fowler sell precision levels for this. The 8" Starrett is about $70.00 after your discount (two yearsIs this the Clino 2000? I think this is the best one. Accuracy is rated as 30", or 5" + .07% of readout. This is after "quick calibration aids" have been used. Take the 30", this is an angle of .0017 inch/foot. Looks like it is good enough for the job. Some of the other Fowler Clinometers have linearities of 3', which is .01 inch/foot, wouldn't be reliable for that sort of work. Still a fine tool, though. If you decide to measure angles more precisely, use a theodolite. My Wild T3A will do better than 1", it reads directly to 0.2", but that is only really achievable with some averaging of multiple measurements. I intend to cut some tapers (J33 & M2) using the theodolite. A straight rod will be indicated on the lathe, and the compound turned so that its travel is parallel to the lathe axis. A reference mirror will be placed on the compound, and zeroed to the theodolite, which is sitting on the lathe (HLVH) bed. The theodolite will then be rotated to the proper angle, which is 149'6.2" for J33, and the compound rotated to center the image on the theodolite reticle. The theodolite is useful for lots of machine accuracy measurements, this is why the T3A has an autocollimator built in. It can be use to measure straightness, orthogonality, level, runout, and so on to arc second accuracy. Surface plates flatness can be measured to <.00005" with them. When electronic ones came out my older mechanical ones became available on the surplus market. For big mills and routers they are ideal to check out way accuracy. In the range of precision for which it is intended, the Clinometer will be much quicker. It will not measure horizontal angles though. Elliot B. |
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Re: MSc Degree in Mech. Eng.
alex
Is it available for a general public?
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Alex ----- Original Message -----
From: Semih Diken <sdiken@...> To: <CAD_CAM_EDM_DRO@...> Sent: Tuesday, October 22, 2002 10:44 AM Subject: [CAD_CAM_EDM_DRO] MSc Degree in Mech. Eng. Finally I am graduated, thank you for all...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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MSc Degree in Mech. Eng.
Semih Diken
Finally I am graduated, thank you for all...
ABSTRACT CONVERSION OF A CONVENTIONAL LATHE TO A NUMERICALLY CONTROLLED FORM BY USING A COMPUTER BASED MOTION CONTROL UNIT D?KEN, Semih Ms. in Mechanical Engineering University of Gaziantep Supervisor: Prof. Dr. Cengiz DOGAN September 2002, 87 Pages The aim of this study is to convert a conventional lathe to numerical control by using a computer based motion control unit. Main theme of this is to obtain the movement of stepper motor system with lead screw, which is moved by given commands through the computer in certain limits. To obtain this action the movement of machine tools is taken as the model. The shaft with lead screw is beared at two ends by ball bearing. To drive the system, two stepper motors are used. Four-axis stepper motor driver used to drive the motors by sending pulses is fed with a transformer. Stepper motors have been controlled from PC parallel port by a software program, written in Turbo Pascal. It is not used any interface control card between motors driver and computer. It reduced the cost of the system. Keywords: Stepper motor, Computer Numerical Control, Electromechanic, Motion Control Systems. |
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Re: Re, AutoRout
John Guenther
No I have not, my original need has changed but I think I will still build
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it. I bought the plans with the intention of increasing the size in one direction to 36". However since I am no longer building RC airplanes the original use has gone away. I am think of building it to do some engraving and milling on thin stock. I don't have the full motion Z axis upgrade but I need to get it. John Guenther Sterling, Virginia -----Original Message----- 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 |
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