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sources for motor planetary gearheads
Doug Fortune
I'm looking for a source of planetary reduction gears
to attach to my motors so as to increase torque and resolution (say 5:1 to 100:1 range). The only ones I know of are from Pittman Motors but I'd like to find something cheaper or surplus. Does anyone know of such a source? Doug |
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Re: Dan's missing ic
Peter Smith
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----- Original Message -----
From: Dan Mauch <dmauch@...> To: <CAD_CAM_EDM_DRO@...> Sent: 30 April 2000 17:56 Subject: Re: [CAD_CAM_EDM_DRO] Dan's missing ic Dan Have you tried Ericsson Component Supply Unit 3 Middleton gate Guildford Business Park Guildford Surrey GU2 5SG England For parts phone 01483 478000 I got PBD3517 off them, I had to buy 25 but the price was good at 51.00. I should think they will keep PBL3776. Best Wishes Peter Smith Been there and done that last week. Future doesn't have them in stock andhope of foinding them in europe. |
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Re: Dan's missing ic
Been there and done that last week. Future doesn't have them in stock and
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doesn't even have a delivery date. I will try calling sweden tonight in hope of foinding them in europe. Dan -----Original Message-----
From: Derek Barger <hightechsystems@...> To: CAD_CAM_EDM_DRO@... <CAD_CAM_EDM_DRO@...> Date: Sunday, April 30, 2000 9:04 AM Subject: [CAD_CAM_EDM_DRO] Dan's missing ic Hi Dan,discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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Dan's missing ic
Derek Barger
Hi Dan,
I noticed it said one your web page you can't get the ic pbl3776. I was interest in purchasing you product so I thought I would check this out, here is what I found. Ericsson has sold this division to New Japan Radio the New IC is: NJM3776D2 I also checked for a seller found Future-Active sells these 100+ is at ~$6.73each. If I can help you any let me know directly or on the list. Talk to you later. Derek Barger |
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Re: stepper drivers, ST - GSD200
Doug Fortune
Steve Carlisle wrote:
Murray, ST has a great assortment of IC's, and alot of motorSGS-Thomsom (ST Micro) also has an integrated Step & Direction 2 Amp/phase full/half stepping GSD200 module available at www.arrow.com for less than USD$50. You need 3 modules for 3 axes. They also have a bigger 5 Amp GSD500 for more money (of course). You need a parallel port break-out box or board, a power supply, and some steppers to complete the hardware. Doug |
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Re: stepper drivers, Compumotor 6200 indexer
Steve Carlisle
Murray, ST has a great assortment of IC's, and alot of motor
control chips. It has been my experience that unless all the ducumentation that you will need is on the website, and you will not need any adittional engineering help, then stay away from ST. ST has been not willing to provide any help in my situation, but if you are a multi thousand chip user, then that situation may well be differant. The manuals and other language info on your Compumotor indexer may be on thier website, and if not, I may have some here in some older catalogs. Steve ---------- From: Murray Leshner <multi-volti@...> To: CAD_CAM_EDM_DRO@... Subject: [CAD_CAM_EDM_DRO] stepper drivers, Compumotor 6200 indexer Date: Saturday, April 29, 2000 1:52 PM Hello: 1) On the topic of higher current stepper drivers, ST has a 'fully protected' 14 A H-bridge IC (for bipolar operation), VN771P. It's not a single-chip solution, and unfortunately for casual builders, it only comes in 28 pin surface mount package. VN770P is the 9A version. You need two for a 2-phase motor, and need the "front end" circuitry as well. I'm looking into what parts will accomplish microstepping chopper control along with this chip, when I have time. As (one of the) Doug(s) implied, higher voltage drives give higher speed/torque characteristics, and these IC's unfortunately are rated only for up to 26 V operation. 2) I bought a Compumotor 6200 2 axis indexer on eBay. It don't think it falls into the groove with most of you using G-code with software as an indexer, but if anyone does have a use for one, the guy has 7, and to my knowledge sold 3 so far. Prices were approximately $335, 201, 223. I just got manuals for it, and I can't believe how sophisticated it is, compared to my plan to build a PIC or BASIC program. It has it's own program language/operating system, RS-232 interface, encoder interface, limit switch interface and 24 programmable inputs and 24 programmable outputs. I think I will be able to test the RSF linear encoder I picked up by writing a little program to display encoder count status, eliminating my project of building a DRO just to test the encoder. If anyone wants to keep an eye out for one, the seller on is Chris Whiteside (I think his user name is CJWhiteside). Murray ------------------------------------------------------------------------ Was the salesman clueless? Productopia has the answers. ------------------------------------------------------------------------ Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO. Addresses: Post message: 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@... [Moderator] URL to this page: FAQ: bill, List Manager |
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stepper drivers, Compumotor 6200 indexer
Murray Leshner
Hello:
1) On the topic of higher current stepper drivers, ST has a 'fully protected' 14 A H-bridge IC (for bipolar operation), VN771P. It's not a single-chip solution, and unfortunately for casual builders, it only comes in 28 pin surface mount package. VN770P is the 9A version. You need two for a 2-phase motor, and need the "front end" circuitry as well. I'm looking into what parts will accomplish microstepping chopper control along with this chip, when I have time. As (one of the) Doug(s) implied, higher voltage drives give higher speed/torque characteristics, and these IC's unfortunately are rated only for up to 26 V operation. 2) I bought a Compumotor 6200 2 axis indexer on eBay. It don't think it falls into the groove with most of you using G-code with software as an indexer, but if anyone does have a use for one, the guy has 7, and to my knowledge sold 3 so far. Prices were approximately $335, 201, 223. I just got manuals for it, and I can't believe how sophisticated it is, compared to my plan to build a PIC or BASIC program. It has it's own program language/operating system, RS-232 interface, encoder interface, limit switch interface and 24 programmable inputs and 24 programmable outputs. I think I will be able to test the RSF linear encoder I picked up by writing a little program to display encoder count status, eliminating my project of building a DRO just to test the encoder. If anyone wants to keep an eye out for one, the seller on is Chris Whiteside (I think his user name is CJWhiteside). Murray |
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Re: new stepper IC
In a message dated 4/29/00 1:16:04 AM Eastern Daylight Time, mnels@...
writes: << any cost effective alternatives to the L297/L298? >> Best I can come up with is the Ericsson chipset. They have sold it to Japan Radio, but they are producing the chips. I have used the L297/L298 without problems (up to 20 volts with 1.1 Amp/phase). In His Service+ Stan Lewis |
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Re: new stepper IC
--- In CAD_CAM_EDM_DRO@..., "James Cullins" <jcullins@c...>
wrote: Allegro ( www.allegromicro.com ) has some new chips for drivingstepper. The A3971SLB dual will drive 2.5 amps each bridge.They look like great parts but are only available in surface mount packages which makes them rather difficult to use for the hobbyist. Does anyone know of any cost effective alternatives to the L297/L298? Mike |
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Re: Plasma Cutter
Tyler Griffin
Would it be a terrible idea to use toothed belting in lengths from Stockconsidering building an X-Y table for routing purposes. Knowing the pros and cons ofThere is a company called Brecoflex that offers belting in continuous lengths. While there are probably many reasons not to use ballscrews for plasma cutting, this idea may apply to other machines. Has anyone thought of just using the generic 5/8 rolled ball screw? It comes in up to 12 ft lengths and you can get the double preloaded ball nuts, make up a thrust bearing plate that would anchor to the carriage and the ball nut would be driven by the motor instead of the motor driving the screw. The ends of the screw would be mounted under tension thus eliminating the problem of lead screw whip. If there were enough people interested in something like this, the group could get together and design a mechanism and have a bunch made reducing the cost with a volume purchase. Just a thought.... The idea of using the rack because mounting it sideways makes it self cleaning, you may be able to use the belt in the same orientation and take advantage of gravity cleaning as well. Bill Griffin |
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Re: testing please ignored it.
Darrell
Have to click on it to delete it!!!
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----- Original Message -----
From: Reid <rsimon@...> To: <CAD_CAM_EDM_DRO@...> Sent: Thursday, April 27, 2000 1:50 PM Subject: [CAD_CAM_EDM_DRO] testing please ignored it. Ha, shame on you! You are not listen to me on subject! :)discussion of shop built systems, for CAD, CAM, EDM, and DRO.
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Re: DRO/linear encoder
james owens
Hi Rich,
I have no doubt that someone here will disagree with my thoughts on this. This is as it should be for with agreement there is no discussion. I am also embarking on this route. My miller is an old war finish Bridgeport type of machine that is called a Beaver. I have given this set-up some thought over the last few weeks. I am using the Camtronics 4 axis board with software from Tom Kulaga. I thought it false economy to just buy the 2 axis board when the 4 was only a few more penny's. As sure as eggs is eggs I'll want to go the whole lot as soon as the first axis works and I wonder how anything was ever machined pre DRO. I bought 3 encoder strips 360 and 1 rotary encoder, the correct HEDS from USDigital. I looked around before parting with the cash and decided this was the cheapest route. There is much written on this list about glass and metal encoder strips with resolutions in the micron range and prices to match, but I am a machinist used to micrometers that read in thou and an old machine that has seen better days. The HEDS are optical readers and you will not damage either them or the strip by just touching them together. If you look at the USDigital website they have drawings for the installation measurements. The first decision is if the HED or the strip is going to be attached to the moving slide. I opted to move the HED alone the strip because it is easier to seal out the muck. Obtain a piece of aluminium angle of the required length that is straight, double sided tape and stick the encoder strip to it leaving the correct overhang for the HED. I screwed the angle to the machine and checked it with a dial gauge before sticking down the strip. Make up a block on which to mount the HED in the correct position, wire it up and check that the DRO works. The next step is to seal out the grubby bits. I got a length of box section aluminium that the angle and the HED could fit inside leaving enough room for the wires. Then cut a slot along the length of the box to clear the angle and the run of the HED. I am using the same screws that mount the angle to mount the box. This means drilling corresponding holes in the front of the box so everything can be tightened up. These are then blocked up with little rubber bungs. Feed the wires through and block up the ends and everything should be swarf and oil tight. Terry. Dear List, Let me first say that I am in over my head and need advice. I am trying to put together a DRO to measure travel of my Bridgeport knee. The plan is to use a 2 axis DRO kit from Camtronics and a HEDS-9200 module with a 360 linear strip from US Digital. My questions concern mounting of the linear strip. US Digital says this can be done using double stick tape or drilling hole and using screws/aluminum mounts. Is there a web site that might have a picture of a mounting? I know that the protection of the encoder is also important. US Digital said that linear strip runs inside module (makes sense) but doesn't touch it. If it did touch would that destroy the strip or the module? Is it like crashing a hard drive? Any thoughts on this subject will be appreciated. I want to try this installation rather than just buying a DRO. Thanks in advance, Richard Ronchi (Santa Clara, Ca) |
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Re: chain for plasma cutter
Mike Mueller
D-shackles, I believe is what he is looking for, McMaster-Carr has
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them as well as some large home-repair stores Bill Martin wrote: |
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Re: What ratio to use for stepper motor drive?
Harrison, Doug
I'm using 1150 in-lb motors at 1000 steps per rev, driven by 72V, 10A
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microstepping drivers. My drivers scale the current with the pulse rate. The machine is a big knee mill. I started with 1:1 ratio and later switched to 1:2 reduction, giving me .0001 resolution. This resolution is not really useful on a knee mill, but it makes for incredibly smooth movement. The common misconception is that microstepping is used to increase resolution. The intermediate steps are generated with sine/cosine current ratios between phases, but the rotor angle does not necessarily follow this function accurately. The real advantage of microstepping is reduction of resonance problems. Assuming you have adequate motors, the determining factor is your drivers. I will confer with Jon that voltage is what you need for speed. You won't get sufficient current rise at high speed if your drivers can't supply the voltage. I get away with 1:2 reduction because I have 72V supplies. I still get reliable jogging at 100 ipm. So I guess it comes down to what you are working with. Doug -----Original Message----- |
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Re: What ratio to use for stepper motor drive?
On my X and Y axis of my SHoptask I am using 550 in/oz 200 step/rev motors.
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They are driven in 1/2 step mode through a 2:1 reduction belt drive and are turning some 5 tpi ball screws. This works out to 4000 steps per inch and my maximum possible feed is about 80 ipm. Tim [Denver, CO] -----Original Message----- |
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Re: chain for plasma cutter
Bill Martin
You can get chain with all kinds of special thingies (pardon the hi-tech
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jargon :-)) attached to it. Check out a Morse catalog for examples. Bill Martin Jacob Saunders wrote:
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