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Re: microstepping torque
hugo_cnc wrote:
Hi all,Microstepping should not affect the torque. Have you actually observed 3 Nm at 5000 half-steps per second? I would be very suspicious of this measurement. In general, most steppers lose a great deal of their holding torque even at moderate speed. 5000 half-steps/sec (where half-steps give 400 pulses/rev) comes out to 12.5 Rev/sec, or 750 RPM. That is going pretty fast for large, two-phase steppers. If they really give 3 Nm at this speed, they must have holding torque of nearly 10 Nm, I'd guess. (5-phase steppers do much better in this regard, though.) I wonder if this "spec" is really a typo, and the meaning was supposed to be that you get 3 Nm HOLDING torque, and "usable" torque to 5000 half-steps/sec. Jon |
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Re: Newbie Questions
Chris Baugher
On Mon, 21 Oct 2002, C.S.Mo wrote:
At any rate, I've discovered that I really can't stand using the dialsI find them functional but annoying. 3) I don't expect to have the machine converted to CNC anytime in theYou can probably get the scales for a bit cheaper but not a lot. Search for "JTS machinery" on ebay. brackets/shipping..etc. The disadvantage to this is, as far as I know, IIt's possible to do this but you will probably have to build the device yourself. I think it's been done before but I can't remember where off hand. Anyway I don't think the SPC output is fast enough (50 samples/sec.) to use for machine control. It's fine for a DRO but that's probably about it. I'm planning on using servo motors (already have two) with Gecko drivesIf the encoders are attached to the motors they won't help with backlash at all. The encoders need to reflect movement of the *table* and not the motors. The advantage to servos is that the control system will turn the motors until the table gets to where it's supposed to be, whether it's X revolutions or X + a little more because of backlash. Where as steppers just turn a set amount and assume the table got to where it's supposed to be. The other method would be to build my own rotary-to-linear encoder systemThis might be harder than you think. I investigated this for awhile but decided it wasn't really worth the effort. Even if you do get a system that can read to 0.0001" is it really going to be accurate? At that level all kinds of things start to become an issue; flex in various places like the column and table, play in the bearings of the encoder mechanism, even thermal expansion. So, bottom line, is there an advantage to having two DRO systems on aDepends on how long you want to run with just the DRO. If it's going to be awhile before you switch to CNC then it might be worth the effort. If I put on a digimatic scale system will I end up junkingWhen you switch to CNC you will most likely be able to sell the DRO setup for not much loss. C| |
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Re: Vector CAD/CAM --- 180 degree turn
Marv Frankel
Dan,
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Just got off the phone with my younger daughter, who pulled up your link, and fell in love with the ring design. All she has to do is find a husband, and we'll all be happy. Have you ever done an unusual Star of David? Keep up the good work. Marv Frankel Los Angeles ----- Original Message -----
From: "Dan Statman" <dan.statman@...> To: <CAD_CAM_EDM_DRO@...> Sent: Monday, October 21, 2002 7:07 PM Subject: [CAD_CAM_EDM_DRO] Vector CAD/CAM --- 180 degree turn I would like to publicly tell all of you about my 180 degree turn I haveis monitored 24 hours a day by Fred and he responds IMMEDIATELY to alldo. to convert it to rotary degrees and calculate the correct feedrates for eachaol://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: Re, AutoRout
Larry Edinger
Have you started to build it yet? I just got the Plans. He has a upgrade to
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full Z-Axis Machine. ----- Original Message -----
From: "John Guenther" <j.guenther@...> To: <CAD_CAM_EDM_DRO@...> Sent: Monday, October 21, 2002 8:50 PM Subject: RE: [CAD_CAM_EDM_DRO] Re, AutoRout I have the plans and have seen the finished machine a couple of years ago.list.
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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stepper motor damper??
Hi group,
I just picked up a 12 watt nema 34 stepper motor. It has a small boss on the shaft held with a grubscrew. Loosley hanging on this is a washer with what appears to be a ferrite magnet. I assume this is some type of damper. Can anyone comment on this and is it worth keeping or should I discard it? Regards Bob Thomas |
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Re: Re, AutoRout
John Guenther
I have the plans and have seen the finished machine a couple of years ago.
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John Guenther Sterling, Virginia -----Original Message----- |
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Re: Newbie Questions
Yeah, I've tried that.. Mostly my problem has been in drilling/taping2) Judging by others' comments, it appears that one of the biggestTwo suggestions 1/2"+ holes where if I have the head high enough to get my drill bit out of the chuck, it is too high for my center drill. I guess I could buy longer center drills but that doesn't really 'solve' the problem. 2/ Have a look in Model Engineers Workshop there have been a numbe ofNow that is a very interesting and novel solution. I think I like that! Is Model Engineers Workshop a magazine? --C.S. |
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Re: CAM Software Options?
Alan Matheson
Have a look at CapsMill and at Powerstation 2002. I also got an evaluation
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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. Alan Matheson ----- Original Message -----
From: "natchamp_87" <mark@...> To: <CAD_CAM_EDM_DRO@...> Sent: Tuesday, October 22, 2002 12:54 PM Subject: [CAD_CAM_EDM_DRO] CAM Software Options? While I'm waiting to find the right machine for my cnc retrofit, 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........ bill |
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Re: Newbie Questions
Alan Matheson
2) Judging by others' comments, it appears that one of the biggestTwo suggestions 1/ Try to plan your work so you don't have to move the head. Measure up your various tools eg your R8 collet chuck, drill chuck etc so you know in advance how much room you need to change from one to another. Then when starting a job you can set the head just far enough above the work to extract one tool holder and replace it with another. 2/ Have a look in Model Engineers Workshop there have been a numbe of articles on this. Quite a good suggestion was to bolt a laser pointer on the mill head (Horizontal plane) and aim it at a wall some distance away. Draw a vertical line on the wall. If the mill head is rotated when it is raised or lowered then you can get it back into alignment by moving the head until the laser spot is on the line again. Alan Matheson |
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Re: Newbie Questions
In a message dated 10/21/2002 9:02:26 PM Mountain Daylight Time,
cs@... writes: I guess I could buyThe option that I took was to buy screw machine drills, they are much shorter and will work except when the hole has to be really deep. The 1/2 inch bit is about 3.9 OAL, the number and letter drills are shorter than the 1/2 is. I bought all three sets in one box. Saves a lot of Z axis cranking. bill CCED |
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Re: Newbie Questions
In a message dated 10/21/2002 9:02:26 PM Mountain Daylight Time,
cs@... writes: Is Model Engineers Workshop a magazine?Yes it is and I like it the best of all, but it is only aimed at making tools etc for the workshop, no models or club stuff. It is available in the US thru: wiseowl@... There are some back issues available, but it took me over two years to get all of them and went all over the world to do so. |
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3ft x 1/2" x 10 TPI Steel Lead/Acme Screws For Sale on eBay.
Lloyd Leung
For sale on eBay:
NEW 3ft x 1/2" x 10 TPI Steel Lead/Acme Rod and Nut <> eBay Item: 1779890344 I've got 7 or 8 of them. Please contact me off list via eBay's "ask seller a question", or my email attached to this message. Cheers. Lloyd Email: (Lloyd at Leung.net) |
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Re: Questions to make a CNC Router
Have a friend that has a plasma table that is direct drive to the spur
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gear for the rack and it seems to work just fine. No reason all the motors have to match. Of course that upsets some of our sense of balance, but the machine does not care. Tim [Denver, CO] -----Original Message----- |
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Vector CAD/CAM --- 180 degree turn
Dan Statman
I would like to publicly tell all of you about my 180 degree turn I have
taken with Vector. As some of you might remember, i was less than over-joyed with the software last week. I have since joined the Vector discussion group and obtained the latest update to the software (for free from Fred). The Vector discussion board is monitored 24 hours a day by Fred and he responds IMMEDIATELY to all questions. Having Fred available to show me how to use this software has been a tremendous help. This software really is amazing in what it can do. Today's project was a carved titanium ring with the saying "Ani L'Dodi V'Dodi Li" with Hebrew characters. This translates to "I am my beloved's and my beloved is mine." I downloaded a free Hebrew True Type font and installed it on my computer. I started Vector, and with help from Fred, in 10 minutes time I had completed G-Code for pocketing each letter in three passes to a depth of 0.020" with a 0.015" cutter. Dumped the raw G-Code into Microsoft Excel to convert it to rotary degrees and calculate the correct feedrates for each point, and I cut the ring. Total time invested 2.5 hours from conception to rough cut and anodized ring. Pictures of the ring from four different angles can be seen at: 'Dodi-small.jpg Thanks Fred, your support is overwhelming. Daniel J. Statman, Statman Designs www.statmandesigns.com dan.statman@... |
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Re: polymer concrete
Doug Harrison
Some "experts" claim that machine bases must be cast with quartz fill
whereas others say granite is the only choice. The one thing nearly all agree on is that the resin content should be between 5-10% of the total mass. Now for a caveat. The vast research done by Philly and a few others is not without merit. Those who build ruling engines and diamond turning machines benefit from this knowledge base. It's just not applicable to a hobby machine with rolled ballscrews and ABEC1 bearings. Spectral and thermal response of the base is the least of problems here. Start with a true 100% solids epoxy and add your choice of moisture free stone fill. Again, some claim fine powder is best and others say a variety of powder and agregate sizes should be used. At $50 a gallon (10.5 pounds) for epoxy you get up to 200 pounds of casting mix. With filler you should have about thirty cents a pound in the mix. That's about the price of steel. Doug |
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Re: Questions to make a CNC Router
Ron,
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The Entec High speed winding machines used a 90 degree gear box to reduce the rpm on the rack & gear drive systems. Typically the drive on the carrage (axis 2) and the cross (axis 3) were both a rack drive. I can't remember the speeds any more but I can say that they were fast. Bill Higdon Raul, |
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Re: Questions to make a CNC Router
Robert Campbell
Raul,
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All of the commerical machines that I have seen use either a belt or a gear box. You will need about a 10 to 1 reduction.. Bob Campbell ----- Original Message -----
From: "Raul Lara" <ralaco@...> To: <CAD_CAM_EDM_DRO@...> Sent: Monday, October 21, 2002 6:06 PM Subject: [CAD_CAM_EDM_DRO] Questions to make a CNC Router Questions to make a CNC Routeraol://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 drill sharpening
Steve
From: "turbulatordude" <davemucha@...>
You can save a dollar or two if you use coblat and another 50 centsIt all depends on what you are cutting. For hard or even semi hard metals and woods Carbide and Ceramics are great. For softer things Carbide just doesn't take and hold the edge that Cobalt or HHS does. For many plastics, HHS will cut better and last longer then the others. On the other hand I've worked with a few plastics that will even eat up Ceramics.... |
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