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GEM500G CNC photos added
Hi Group,
I added photos of the GEM500G 3 axis conversion to the GEM500G Mill folder. The steppers are 720oz/in with G201 drives, direct drive to the ballscrews. I made my own double-nut design for the ballnuts. The main motor is 1.3HP/3PH/220V with a Mitsubishi VFD. Control is Mach1 on AMD K6-2 450Mhz. Still need to add home switches and oiling pump. Future plans are for a 4/5 axis wrist action mount instead of the trunnion design shown in the CAD images. Allan |
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Re: Toshiba laptop for CNC router
Carol & Jerry Jankura
I don't know if this will help, but a google search for "T4500" DOS Download
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turned up several URL's. One looked interesting, so I followed it. It pointed to a file - TSEP622.EXE - which contains the 'enhancements' for the Toshiba notebooks. This might give you a lead as to what you're looking for. Also, the DOS will be the same as any standard release. What's different will be the drivers. If you know the kind of video board, etc. in the machine, you can search google for those boards, and can often download the drivers from the manufacturer. Hope this helps.... -- Jerry |-----Original Message-----
|From: echnidna [mailto:echnidna@...] |Sent: Wednesday, October 30, 2002 1:19 AM |To: CAD_CAM_EDM_DRO@... |Subject: [CAD_CAM_EDM_DRO] Toshiba laptop for CNC router | | |Hi Group, | |I picked up a Toshiba T4500 486\25 laptop for my CNC router so |power brownouts wont damage the machine or work in progress. | |Its loaded with windows 31 and i would like to reformat it but i |cannot locate much info on the special version of Toshiba Dos that |it uses, despite intensive internet searching. | |Can anyone point me in the right direction |OR |Can anyone tell me how to make DOS setup files on floppies from |the existing files on the laptop. | |Regards to all | |Bob Thomas | | | |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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Re: Chain drive
Tony Jeffree
At 13:16 30/10/2002 +0000, you wrote:
I built an X-Y Table once where chain-drive was used to connect the MOTOR to...or as many others have done, use toothed "timing belt" pulleys. Regards, Tony |
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Re: plasma cutter/machine torch
caudlet
--- In CAD_CAM_EDM_DRO@y..., "John" <johnhe-uk@s...> wrote:
Why not use oxy / fuel? A cutting torch is about ?150 and then allyou need is the hose, arrestors, regs and two bottles.Some things to consider: Oxy/fuel works fine for steel and soft iron. It is a poor method to cut aluminum, copper, brass and other types of metals. If all you want to cut is ferris metals and the quality and precision of the cut is not critical then oxy could be a choice. I plan on building a special carrier that will hold my normal handheld plasma torch rather than buy a machine head for it. There is at least one commercial unit that uses that approach (www.plasmacam.com). |
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Re: Chain drive
--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
Bob:Jan, i am going to use chain instead of leadscrew or rack and pinion. most likely in conjunction with cable to reduce inerta loads Bob |
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Drill press & cross-slide vice
vandersandtc
Hi All
I am new to this list so herewith a small introduction. I have built a few 4 axis polystyrene cutters as well as a 3 axis router table. I mainly use these for hobby use (radio controlled flying). I have also written some cnc programming software for 2 and 4 axis foam cutter use to generate gcode from dxf drawings. I am sure that I will learn a lot from this group. Now my question : I bought a cross-slide vice yesterday and my first thought was 'Hey, if I stick some steppers on this sucker, mount it on my drill press then I might have a cheap mill' - I suppose a lot of people have asked this question before. I would like to hear your comments please. Regards Coert |
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Re: plasma cutter/machine torch
John
Why not use oxy / fuel? A cutting torch is about 150 and then all you need
is the hose, arrestors, regs and two bottles. I have a Thermal Arc (Made by Thermadyne, who make Thermal Dynamics) arc welder and it's quality is absolutely first rate. But at retail this would have cost me $2.5 something K. That's fine is I actually needed to weld a bridge or tank but I don't and I want to sell this soon. We had this dicussion on hobbicast a while ago. So many of the things being sold in the US are industrial / millitary quality gear for use by the public to weld a go-kart together. For example, Miller welders as tall as I am that the public buy and run on single phase expecting the same quality out. If you are doing this as a hobby, a cheap plasma cutter will do absolutely fine. It's not made to cut for hours and hour every day but it will do an appreciable amount of cutting. Why would a hobbyist need something that has a duty cycle above what most people use industrially? If you want to make a buisness out of it, sure go for a nice good quality cutter, but otherwise, I'd just use my oxy / fuel gear. John I have looked into various low-end plasma cutters in the 1,000-1,500aol://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: DRO encoders- Rotary or Linear?
John A. McFadden wrote:
Instead of using a rack and pinion, would it be possible to use a rigid barYup, this is basically a trav-a-dial. I think they use a brass or bronze roller under a fair amount of pressure. They just use the mill table or lathe ways as the 'track'. A rubber roller won't work, unless it is extremely hard, as the pressure will cause a flat spot to develop as it rolls, and you won't get a consistant turns/inch. Also, when sitting for a while it would get a more permanent flat spot. Jon |
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Re: Toshiba laptop for CNC router
illya
Hi Bob
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Try you can download the boot disk from here. If you have a cdrom in the notebook, you may need specific drivers for it. Try www.toshiba.com look in the support/driver area. Illya ----- Original Message -----
From: "echnidna" <echnidna@...> To: <CAD_CAM_EDM_DRO@...> Sent: Wednesday, October 30, 2002 4:49 PM Subject: [CAD_CAM_EDM_DRO] Toshiba laptop for CNC router Hi Group,brownouts wont damage the machine or work in progress. locate much info on the special version of Toshiba Dos that it uses, despite intensive internet searching. existing files on the laptop. 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: Sargon DRO Serial Output / CNC
b564htf wrote:
A CNC newbie question: Why can't the serial output from a SargonWhat serial output? Most DROs don't have a serial output. But, the real reason is most DROs update about 2-5 times a second. That would allow you to move about 1 inch per hour with confidence. I run EMC at 1000 updates a second, and a lot of newer CNC controls read position 40,000 to 100,000 times a second for smoothness of motion. Jon |
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Re: DRO encoders- Rotary or Linear?
alex wrote:
This may be a stupid question, but why not to use a normal bicycleSprockets and chains, unless very carefully designed have an inherent cogging effect that causes cyclical errors every tooth, and then the chains have variations in pitch from roller to roller, which varies as the chain ages, and the rollers and pins wear. There may be instrument-grade chains, but normal bicycle chain, besides being heavy enough to break an encoder, are certainly not manufactured to the tolerances needed. W. M. Berg has all sorts of miniature instrument-type cable-chains that use plastic molded over aircraft cable. These are not instrument-grade accuracy, but might work better than the bicycle chain. I use them in my mill, but only for tachometer drive, not the encoders. Jon |
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Toshiba laptop for CNC router
Hi Group,
I picked up a Toshiba T4500 486\25 laptop for my CNC router so power brownouts wont damage the machine or work in progress. Its loaded with windows 31 and i would like to reformat it but i cannot locate much info on the special version of Toshiba Dos that it uses, despite intensive internet searching. Can anyone point me in the right direction OR Can anyone tell me how to make DOS setup files on floppies from the existing files on the laptop. Regards to all Bob Thomas |
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Re: How do I 'make' a ballscrew antibacklash nut?
Raymond Heckert
Ball screws are practically anti-backlash, nevertheless,
FYO, you'd basically put the two nuts back-to-back, and screw them together, until they almost 'bind'. now you have a backlash-free nut. Of course, you wouldn't really mount them back-to-back, you'd mount each 'back' to either side of a mounting plate, and use spring washers to 'pre-load' the screws, allowing some 'give' under severe pressures, instead of making it a 'hard' mechanical back-to-back interface. With a Grizzly, and 0.004"/ft screws, I'd not bother with the antibacklash, as 'machine slop' coupled with the 0.004"/ft will be the real test for your system. 'Less'n, of course, you're looking for some REAL accurate work. RayHex ---------- From: dspinnett <dspinnett@...>Camtronics 4 axis servo), but the backlash and lead accuracy stink.McMaster- Carr, and use a pair of taper or angular contact bearingsfor the drive end.'anti-backlash' nut from two regular ball screw nuts? how do you connect themto the mills existing mount (two screws)... I've read aboutusing a spring to pre-load, but I cant visualize how that works. |
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Re: DRO encoders- Rotary or Linear?
Matt Shaver
On Tuesday 29 October 2002 06:39 pm, you wrote:
Instead of using a rack and pinion, would it be possible to use a rigid barThis is essentially what a Trav-a-Dial does, except the roller is steel, not rubber. The company that makes them, Southwestern Industries, also makes a CNC control called a ProtoTrak which uses position sensors based on the same principle. See: Matt |
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Bridgeport Series II CNC specifications
I have the opportunity to try to squeeze one of these machines into
my garage and I have been having difficulty finding out the dimensions of this beast. This is an early 1980's Boss5 / stepper motor controlled machine with the rigid ram and kwik-switch tooling. Does anyone know the specific height requirements? A manual Series II Special Bridgeport is 84" - I've been told. I know this CNC machine is a bit taller than that. Any ideas? Thanks, Tim |
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Re: How do I 'make' a ballscrew antibacklash nut?
--- In CAD_CAM_EDM_DRO@y..., "dspinnett" <dspinnett@y...> wrote:
Hi all, I'm kind of a CNC newbie.Camtronics 4 axis servo), but the backlash and lead accuracy stink.Some ballnuts has one end with outside fine treads on it, put both ballnuts agaist each other and using the adjusting outside nut you can put pressure on the two ballnuts forcing them to pull apart from each other thus, preloading them. sort of split acme nuts. The springs, takes the adjusting nut place ,and it works ok only for small loads. |
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Re: DRO encoders- Rotary or Linear?
Raymond Heckert
Check out the "Shooting Star" DRO's. They use a
(plastic-loom, covered) rack, driving a pinion, coupled to an encoder, and are very reliably, and pretty accurate, as long as you mount them properly. RayHex ---------- From: John A. McFadden <mcfadden@...>to use a rigid bar (like 1" or 1.5" drill rod) and a rubber roller mountedto a rotary encoder? With a solid bar, wipes could be used to clear thesurface before the roller passed over it, unlike the rack and pinion where clearingit would be a difficult measure at best if something were to get in theteeth. |
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Re: DRO encoders- Rotary or Linear?
Raymond Heckert
Alex, It's not merely a backlash issue. (Although, a
properly designed roller chain transmission *must* have some slack built in. As any kind of roller chain meets the sprocket, and changes from linear to rotary motion, the chain jumps up, and down at each pitch. This is more pronounced with low tooth numbers, and double pitch chain. Immediately, upon full engagement with the tooth, the linear section of the chain begins to swing downward, as the disappearing tooth 's rotary motion moves it downward. When the next tooth engages, the chain is brought up to tangency with the pitch circle again. This is only minute movement, but it sets up a quite a vibration. Timing chain is about the only chain that doesn't exhibit this quirk, which is why they're called timing chains, because that's what they're used for. Virtually vibration free, and they take up their own slack by climbing to the highest available form on the tooth. RayHex ---------- From: alex <telecomt@...>normal bicycle chain\sprocket combination for driving an encoder? |
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