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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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#1
Posted to rec.crafts.metalworking
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Sintered Bronze?
On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote:
I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html |
#3
Posted to rec.crafts.metalworking
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Sintered Bronze?
"Ed Huntress" wrote in message ... On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. but here are some answers to his questions: 1) Yes, they are all the same thing. Any of them can be various alloys, including Oilite, but most are made of a plain bronze or bearing bronze, the latter for high loads. They aren't exactly the same alloys used for plain bushings but they're close. 2) Sintered means they are heated to diffusion temperature (below actual melting) to bond the particles together. The particles are bronze powder. The powder is pressed in a die and then sintered in a furnace. They don't press the powder to full density because they want it to remain porous, to hold oil, which they inject into the bearings under pressure after sintering. A pressure cooker would probably do it. 3) A sintered bearing, if the right thing for the application, can last for years in intermittant use. Or weeks, if it's not the right thing. Examples: I have a blender with a sintered bronze bearing that is 40 years old. The oil in it dried up after about 10 years, and it started to bind. Now I put one drop of light oil on it every third or fourth time I use it, and it's still going strong after an additional 30 years. Another: The burner-blower motor on my gas-fired furnace has sintered bearings front and back. It is 30 years old. The front bearing dried out and seized after 12 years. I took it apart, polished the armature shaft on my lathe, and re-assembled it. I put two drops of lathe-spindle oil (for plain bronze bearings; it's South Bend oil) on the front bearing and one on the rear bearing every Ocotober. It usually lasts until February, when I apply more oil. I'm now using Mobil 1, 0W-20. I've noticed that it lasts for the whole heating season. You'll never fully replace the pressure-injected oil of a new bearing this way, in terms of how much oil you can get into it, but such bearings actually seem to run better with the oil dripped on externally. That stands to reason because the injected oil only gets to the bearing surface by capillary action, and it must be a very light oiling that the bearing gets in that way. Good info nonetheless. |
#4
Posted to rec.crafts.metalworking
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Sintered Bronze?
On Wed, 1 May 2013 10:37:51 -0700, "PrecisionmachinisT"
wrote: "Ed Huntress" wrote in message ... On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. but here are some answers to his questions: 1) Yes, they are all the same thing. Any of them can be various alloys, including Oilite, but most are made of a plain bronze or bearing bronze, the latter for high loads. They aren't exactly the same alloys used for plain bushings but they're close. 2) Sintered means they are heated to diffusion temperature (below actual melting) to bond the particles together. The particles are bronze powder. The powder is pressed in a die and then sintered in a furnace. They don't press the powder to full density because they want it to remain porous, to hold oil, which they inject into the bearings under pressure after sintering. A pressure cooker would probably do it. 3) A sintered bearing, if the right thing for the application, can last for years in intermittant use. Or weeks, if it's not the right thing. Examples: I have a blender with a sintered bronze bearing that is 40 years old. The oil in it dried up after about 10 years, and it started to bind. Now I put one drop of light oil on it every third or fourth time I use it, and it's still going strong after an additional 30 years. Another: The burner-blower motor on my gas-fired furnace has sintered bearings front and back. It is 30 years old. The front bearing dried out and seized after 12 years. I took it apart, polished the armature shaft on my lathe, and re-assembled it. I put two drops of lathe-spindle oil (for plain bronze bearings; it's South Bend oil) on the front bearing and one on the rear bearing every Ocotober. It usually lasts until February, when I apply more oil. I'm now using Mobil 1, 0W-20. I've noticed that it lasts for the whole heating season. You'll never fully replace the pressure-injected oil of a new bearing this way, in terms of how much oil you can get into it, but such bearings actually seem to run better with the oil dripped on externally. That stands to reason because the injected oil only gets to the bearing surface by capillary action, and it must be a very light oiling that the bearing gets in that way. Good info nonetheless. Jeez, though...spending the time to write that when it was posted in 1997...'makes one kind of cynical about every *trying* to get something going on metalworking, ya' know? Oh well, back to the Constitution and explaining match rifles versus service rifles. g -- Ed Huntress |
#5
Posted to rec.crafts.metalworking
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Sintered Bronze?
"Ed Huntress" wrote in message ... On Wed, 1 May 2013 10:37:51 -0700, "PrecisionmachinisT" wrote: "Ed Huntress" wrote in message . .. On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. but here are some answers to his questions: 1) Yes, they are all the same thing. Any of them can be various alloys, including Oilite, but most are made of a plain bronze or bearing bronze, the latter for high loads. They aren't exactly the same alloys used for plain bushings but they're close. 2) Sintered means they are heated to diffusion temperature (below actual melting) to bond the particles together. The particles are bronze powder. The powder is pressed in a die and then sintered in a furnace. They don't press the powder to full density because they want it to remain porous, to hold oil, which they inject into the bearings under pressure after sintering. A pressure cooker would probably do it. 3) A sintered bearing, if the right thing for the application, can last for years in intermittant use. Or weeks, if it's not the right thing. Examples: I have a blender with a sintered bronze bearing that is 40 years old. The oil in it dried up after about 10 years, and it started to bind. Now I put one drop of light oil on it every third or fourth time I use it, and it's still going strong after an additional 30 years. Another: The burner-blower motor on my gas-fired furnace has sintered bearings front and back. It is 30 years old. The front bearing dried out and seized after 12 years. I took it apart, polished the armature shaft on my lathe, and re-assembled it. I put two drops of lathe-spindle oil (for plain bronze bearings; it's South Bend oil) on the front bearing and one on the rear bearing every Ocotober. It usually lasts until February, when I apply more oil. I'm now using Mobil 1, 0W-20. I've noticed that it lasts for the whole heating season. You'll never fully replace the pressure-injected oil of a new bearing this way, in terms of how much oil you can get into it, but such bearings actually seem to run better with the oil dripped on externally. That stands to reason because the injected oil only gets to the bearing surface by capillary action, and it must be a very light oiling that the bearing gets in that way. Good info nonetheless. Jeez, though...spending the time to write that when it was posted in 1997...'makes one kind of cynical about every *trying* to get something going on metalworking, ya' know? Oh well, back to the Constitution and explaining match rifles versus service rifles. g -- Ed Huntress Instead of a pressure cooker, I wonder if one way to re-impregnate oil into a sintered bushing might be to soak it in oil and pull a vacuum on it. The air will go out and then the oil will be pushed back in after re-pressurizing. I have used small vacuum containers and a hand pump for de-gassing epoxy, and they sell something similar for food storage. |
#6
Posted to rec.crafts.metalworking
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Sintered Bronze?
In article ,
"anorton" wrote: I wonder if one way to re-impregnate oil into a sintered bushing might be to soak it in oil and pull a vacuum on it. The air will go out and then the oil will be pushed back in after re-pressurizing. I have used small vacuum containers and a hand pump for de-gassing epoxy, and they sell something similar for food storage. You're better off to pull the vacuum on it first, then (still under vacuum) drop it in the oil. Otherwise getting the air out is complicated by the pressure of the oil. Dropping it in oil and pulling a vacuum will work, but pulling a vacuum and dropping on oil will work better.... IIRC, this is how hard maple submarine bearings are done. Likewise, degassing epoxy is complicated by having any depth to it, by the pressure of the liquid above. An ideal setup would pour the epoxy into the mold/cast/item being potted while under vacuum. Not that I ever had that setup, but I could see the advantage it would have, while I was doing it the other way... -- Cats, coffee, chocolate...vices to live by Please don't feed the trolls. Killfile and ignore them so they will go away. |
#7
Posted to rec.crafts.metalworking
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Sintered Bronze?
On Wed, 1 May 2013 11:03:41 -0700, "anorton"
wrote: "Ed Huntress" wrote in message .. . On Wed, 1 May 2013 10:37:51 -0700, "PrecisionmachinisT" wrote: "Ed Huntress" wrote in message ... On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. but here are some answers to his questions: 1) Yes, they are all the same thing. Any of them can be various alloys, including Oilite, but most are made of a plain bronze or bearing bronze, the latter for high loads. They aren't exactly the same alloys used for plain bushings but they're close. 2) Sintered means they are heated to diffusion temperature (below actual melting) to bond the particles together. The particles are bronze powder. The powder is pressed in a die and then sintered in a furnace. They don't press the powder to full density because they want it to remain porous, to hold oil, which they inject into the bearings under pressure after sintering. A pressure cooker would probably do it. 3) A sintered bearing, if the right thing for the application, can last for years in intermittant use. Or weeks, if it's not the right thing. Examples: I have a blender with a sintered bronze bearing that is 40 years old. The oil in it dried up after about 10 years, and it started to bind. Now I put one drop of light oil on it every third or fourth time I use it, and it's still going strong after an additional 30 years. Another: The burner-blower motor on my gas-fired furnace has sintered bearings front and back. It is 30 years old. The front bearing dried out and seized after 12 years. I took it apart, polished the armature shaft on my lathe, and re-assembled it. I put two drops of lathe-spindle oil (for plain bronze bearings; it's South Bend oil) on the front bearing and one on the rear bearing every Ocotober. It usually lasts until February, when I apply more oil. I'm now using Mobil 1, 0W-20. I've noticed that it lasts for the whole heating season. You'll never fully replace the pressure-injected oil of a new bearing this way, in terms of how much oil you can get into it, but such bearings actually seem to run better with the oil dripped on externally. That stands to reason because the injected oil only gets to the bearing surface by capillary action, and it must be a very light oiling that the bearing gets in that way. Good info nonetheless. Jeez, though...spending the time to write that when it was posted in 1997...'makes one kind of cynical about every *trying* to get something going on metalworking, ya' know? Oh well, back to the Constitution and explaining match rifles versus service rifles. g -- Ed Huntress Instead of a pressure cooker, I wonder if one way to re-impregnate oil into a sintered bushing might be to soak it in oil and pull a vacuum on it. The air will go out and then the oil will be pushed back in after re-pressurizing. I have used small vacuum containers and a hand pump for de-gassing epoxy, and they sell something similar for food storage. It may be. I read about how they're made in....uh....around 1978, when I was working for _American Machinist_. My memory doesn't do well on details that far back. But IIRC, they *first* pull a moderate vacuum, and then fill the bearing with pressure. If they don't pull some vacuum first the oil can be forced out after the pressure is released. I think. Or they push from one side and leave the other side open to the atmosphere. Or maybe they do one or the other, depending on the bearing configuration. My memory on this one is a mess, between my original guesses and what I learned when studying powder metallurgy. Again, that was a long time ago for me. -- Ed Huntress |
#8
Posted to rec.crafts.metalworking
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Sintered Bronze?
On Wed, 01 May 2013 10:37:51 -0700, PrecisionmachinisT wrote:
"Ed Huntress" wrote in message ... On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. .... Bob Neidorff .... Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. .... Minor quibble: karammundi and suraj are Indian names rather than Chinese, and the +91 country code in the telephone number on the webpage stands for India, and Ludhiana, Punjab, India is their "local market". (There's Punjab, Pakistan as well as Punjab, India; Ludhiana is in India.) -- jiw |
#9
Posted to rec.crafts.metalworking
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Sintered Bronze?
On 01/05/13 18:37, PrecisionmachinisT wrote:
"Ed Huntress" wrote in message ... On Wed, 1 May 2013 05:45:38 -0700 (PDT), wrote: On Friday, May 30, 1997 12:00:00 AM UTC-7, wrote: I hear terms like "Oilite", "Sintered Bronze", and "Oil-Impregnated Bronze SAE-841" used for bronze bearings. Are these all the same thing, or slightly different alloys? In this context, what does "Sintered" mean? What would you expect for a bearing of this sort? Does it need constant, occasional, or no lubrication? What would you expect for life? When would you use this as preferred to cast bronze or some other bushing? Thanks for your help! -- Bob Neidorff -------------------==== Posted via Deja News ====----------------------- http://www.dejanews.com/ Search, Read, Post to Usenet Sintered Bronze bushes are usually used in every machine part.. http://www.surajcomponents.com/self-...d-bearing.html I didn't see Bob's original on this, It was originally posted in 1997, and resurrected by a spammer, probably Chinese. but here are some answers to his questions: 1) Yes, they are all the same thing. Any of them can be various alloys, including Oilite, but most are made of a plain bronze or bearing bronze, the latter for high loads. They aren't exactly the same alloys used for plain bushings but they're close. 2) Sintered means they are heated to diffusion temperature (below actual melting) to bond the particles together. The particles are bronze powder. The powder is pressed in a die and then sintered in a furnace. They don't press the powder to full density because they want it to remain porous, to hold oil, which they inject into the bearings under pressure after sintering. A pressure cooker would probably do it. IIRC the information I have seen said that the sintered bearings were put in a vacuum chamber which was then evacuated then flooded with lubricant so the oil was forced into the pores of the material. 3) A sintered bearing, if the right thing for the application, can last for years in intermittant use. Or weeks, if it's not the right thing. Examples: I have a blender with a sintered bronze bearing that is 40 years old. The oil in it dried up after about 10 years, and it started to bind. Now I put one drop of light oil on it every third or fourth time I use it, and it's still going strong after an additional 30 years. Another: The burner-blower motor on my gas-fired furnace has sintered bearings front and back. It is 30 years old. The front bearing dried out and seized after 12 years. I took it apart, polished the armature shaft on my lathe, and re-assembled it. I put two drops of lathe-spindle oil (for plain bronze bearings; it's South Bend oil) on the front bearing and one on the rear bearing every Ocotober. It usually lasts until February, when I apply more oil. I'm now using Mobil 1, 0W-20. I've noticed that it lasts for the whole heating season. You'll never fully replace the pressure-injected oil of a new bearing this way, in terms of how much oil you can get into it, but such bearings actually seem to run better with the oil dripped on externally. That stands to reason because the injected oil only gets to the bearing surface by capillary action, and it must be a very light oiling that the bearing gets in that way. Good info nonetheless. |
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