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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#41
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Electrical slip ring questions
Neon John wrote:
On Wed, 12 Apr 2017 09:11:45 -0700, wrote: On 12 Apr 2017 04:01:56 GMT, "DoN. Nichols" wrote: I thought about that but dismissed it because I really don't know how I would go about doing it. You should dismiss it because it is complication you don't need. My contact in Ford Engineering That might be the Detroit area. I drove a truck or two there a few times. |
#43
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Electrical slip ring questions
Eric - I took a look at Parker Seals' "O-ring Handbook". It now has a spot
on the book shelf, so to speak. There was mention of a rotary speed limit of 1500 feet per minute, but that was in a section about "hydraluics". Hul wrote: On Sat, 15 Apr 2017 06:42:48 +0000 (UTC), Hul Tytus wrote: Eric - do you remember what rubber compound was used on the gun drill? Hul SNIP No. It was a long time ago. The rubber was not exotic though. I just looked for rubber compounds that could handle the temperature and oil composition. It mighta been EPDM. I don't think it was BUNA-N. Eric |
#44
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Electrical slip ring questions
On Sat, 15 Apr 2017 11:34:22 -0700, Gunner Asch
wrote: On Wed, 12 Apr 2017 20:29:20 -0400, wrote: On Tue, 11 Apr 2017 21:58:53 -0700, Gunner Asch wrote: On Tue, 11 Apr 2017 21:33:27 -0400, wrote: On Tue, 11 Apr 2017 16:18:16 -0700, Gunner Asch wrote: On Tue, 11 Apr 2017 13:46:24 -0700, wrote: I'm sue someone here can help. I need to get power to a solenoid operated valve spinning at 5000 RPM. Low power, 24 volts at 5 watts. The power will be on for about 4 seconds and off for 7 seconds. This on/off cycle will be going on 10 hours a day. I ahve looked at slip rings online but the high speed through hole type are really spendy. Then I got to thinking about the slip rings in alternator. They certainly can carry enough current but I don't know how fast alternators typically spin. I do have an old alternator that would make a good slip ring donor. Anybody know or have a better idea? I need about 1 inch through the slip rings. Thanks, Eric How about a timer made from a 555? The question wasn't how to make the pulse Gunner - but how to trasnmit the power pulses to a spinning shaft. Simply use an encoder. to trigger your timer. http://www.ebay.com/itm/Incremental-...-/171947459869 How does he get the power to the spinning part??? Evidently Im missing some portion of the request. What exactly is he trying to accomplish with a collet closer etc etc. Air collet closers have a definate "lead time". They take time to pressure up enough to move, then the air must be maintained while the other side is opened to atmosphere and vented.... and then released and vented while the opposite side must be pressured up and maintained, etc etc. "lead time" is measured in fractions of a second..small fractions. If he has to have even faster response..hydraulic operation will be required. Electrical would be fastest..shrug..but Im not going there...brrrrrr. I dont quite understand what the slip rings are doing. If he is simply trying to get a signal of some sort..say RPM out of the spinning spindle...that simple encoder will give him proper A+ B+ electrical signals. Couple the encoder to the spindle with a matched set of identical diameter pulleys and a toothed belt. It was my understanding he has a solenoid valve in the shaft to contol the air. Energized it puts air to the cyl to close the collet chich, de-enrergised it puts air to the release cyl and vents the close cyl. He needs to get the electical signal to the spinning solenois - and the SIMPLEST way is to use a set of slip-rings to feed the electrical signal into the 5000 RPM spinning collet eaaembly. http://www.omniturn.com/bin/RepairPa...components.htm Obviously anyone with a brain can purchase these items for 1/3-1/4 of the price of the above items, I simply gave that link for the photos. As I do CNC lathe repair/building/maint... Im somewhat experienced in the topic. Im just not understanding what it is that he is trying to do. I do have a few extra spindle mounted collet closers (air powered) Id be willing to donate (1) to the cause, simply for shipping. I think that I may also have at least (1) Royal and (1) Microcentric collet closer collecting dust back there as well as Dunhams. "powered" collet closers on lathes have been around for a very long time, be they manual or CNC or even NC. Gunner --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#45
Posted to rec.crafts.metalworking
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Electrical slip ring questions
On Sat, 15 Apr 2017 20:37:30 +0000 (UTC), Hul Tytus
wrote: Eric - I took a look at Parker Seals' "O-ring Handbook". It now has a spot on the book shelf, so to speak. There was mention of a rotary speed limit of 1500 feet per minute, but that was in a section about "hydraluics". Hul Well, the sealing diameter was about 2 inches, as I recall. So that would be about 3000 RPM at 1500 FPM. I don't remember where in the Parker book the information was that I used to design the rotary union. But bit in there and the whole thing was pretty easy. Parker had already done all the heavy lifting, so to speak. Eric wrote: On Sat, 15 Apr 2017 06:42:48 +0000 (UTC), Hul Tytus wrote: Eric - do you remember what rubber compound was used on the gun drill? Hul SNIP No. It was a long time ago. The rubber was not exotic though. I just looked for rubber compounds that could handle the temperature and oil composition. It mighta been EPDM. I don't think it was BUNA-N. Eric |
#46
Posted to rec.crafts.metalworking
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Electrical slip ring questions
On Sat, 15 Apr 2017 17:36:27 -0400, wrote:
I dont quite understand what the slip rings are doing. If he is simply trying to get a signal of some sort..say RPM out of the spinning spindle...that simple encoder will give him proper A+ B+ electrical signals. Couple the encoder to the spindle with a matched set of identical diameter pulleys and a toothed belt. It was my understanding he has a solenoid valve in the shaft to contol the air. Energized it puts air to the cyl to close the collet chich, de-enrergised it puts air to the release cyl and vents the close cyl. He needs to get the electical signal to the spinning solenois - and the SIMPLEST way is to use a set of slip-rings to feed the electrical signal into the 5000 RPM spinning collet eaaembly. But...why do it that way? http://files.ctctcdn.com/9939db8e001...7198e299f1.gif http://www.dunhamtool.com/products/cd0007.gif http://www.dunhamtool.com/products/cd0008.gif http://www.innovativetoolsales.com/M...20-%200206.pdf Good technical drawings of a standard Dunham collet closer. It will run 5k rpm with no issues, though I strongly suggest feeding it a bit of oil mist through the lube ports. http://www.omniturn.com/bin/RepairPa...eplacement.pdf --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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