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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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Clausing Variable-Speed Drives - DTE24 oil is too thin
I have had a Clausing 5914 lathe since 2007, and always had problems
with the variable-speed drive, and a major problem was that I never could get all the air out of the hydraulic system that is used to control speed. Following Clausing's recommendation of the day, I have been using Mobil DTE24 Hydraulic Oil in the control system and headstock. I tried many things to bleed the air out of the hydraulics, and sometimes I's succeed, but it would not last. I could hear air being aspirated back into the system when I pushed the control wheel to the low-speed limit, so I was just chasing my tail -- all motion, no progress. I was going to solve the aspiration problem by adding an external oil reservoir (like the old cylindrical steel upper hydraulic assemblies) so that the path to the free surface of the oil would be too long for aspiration to be possible, so I inquired on the Clausing list if anybody has a rectangular aluminum upper assembly for sale. This elicited many questions, and a clue. It turned out that oil product names and numbers changed between when the lathe was made (circa 1975) and 2007, and the old oils (Shell Tellus 27 and 33) were not near-equivalents to the similarly-numbered Tellus 22 and 32. What had happened is that the oil industry eliminated the profusion of different ways to measure oil viscosity, and settled upon the ISO Viscosity definitions and grades. The new Tellus product numbers are based on the ISO Viscosity Grades of the oils, and not on whatever had been used before the transition. Clausing Tech Support fell into this trap circa 2007. The effect of the error was that the recommended substitutions were an entire viscosity grade too thin. New (2015) substitutions: Tellus 27 -- ISO VG 46 (Mobil DTE 25, not DTE24). Tellus 33 -- ISO VG 68 (Mobil DTE 26, not DTE25). Changing the oil in the headstock and hydraulic system to DTE25 had a dramatic effect. Now, purging air is easy, requiring one maybe two cycles (versus ten or fifteen, which nonetheless often failed) and the VS system works correctly. And in a welcome surprise, the lathe runs far quieter now. (I also changed the oil in the apron to DTE26, but there was no obvious difference, although it was in any event due for an oil change.) I also now know why the old purge approach sometimes worked and sometimes did not -- it depended on the season of year: Oil viscosity is very sensitive to temperature, so in the winter the oil is thick and the purge cycle worked, but in the summer the oil is thin and it did not work. Joe Gwinn |
#2
Posted to rec.crafts.metalworking
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Clausing Variable-Speed Drives - DTE24 oil is too thin
On Sat, 18 Apr 2015 13:30:06 -0400, Joe Gwinn
wrote: I have had a Clausing 5914 lathe since 2007, and always had problems with the variable-speed drive, and a major problem was that I never could get all the air out of the hydraulic system that is used to control speed. Following Clausing's recommendation of the day, I have been using Mobil DTE24 Hydraulic Oil in the control system and headstock. I tried many things to bleed the air out of the hydraulics, and sometimes I's succeed, but it would not last. I could hear air being aspirated back into the system when I pushed the control wheel to the low-speed limit, so I was just chasing my tail -- all motion, no progress. I was going to solve the aspiration problem by adding an external oil reservoir (like the old cylindrical steel upper hydraulic assemblies) so that the path to the free surface of the oil would be too long for aspiration to be possible, so I inquired on the Clausing list if anybody has a rectangular aluminum upper assembly for sale. This elicited many questions, and a clue. It turned out that oil product names and numbers changed between when the lathe was made (circa 1975) and 2007, and the old oils (Shell Tellus 27 and 33) were not near-equivalents to the similarly-numbered Tellus 22 and 32. What had happened is that the oil industry eliminated the profusion of different ways to measure oil viscosity, and settled upon the ISO Viscosity definitions and grades. The new Tellus product numbers are based on the ISO Viscosity Grades of the oils, and not on whatever had been used before the transition. Clausing Tech Support fell into this trap circa 2007. The effect of the error was that the recommended substitutions were an entire viscosity grade too thin. New (2015) substitutions: Tellus 27 -- ISO VG 46 (Mobil DTE 25, not DTE24). Tellus 33 -- ISO VG 68 (Mobil DTE 26, not DTE25). Changing the oil in the headstock and hydraulic system to DTE25 had a dramatic effect. Now, purging air is easy, requiring one maybe two cycles (versus ten or fifteen, which nonetheless often failed) and the VS system works correctly. And in a welcome surprise, the lathe runs far quieter now. (I also changed the oil in the apron to DTE26, but there was no obvious difference, although it was in any event due for an oil change.) I also now know why the old purge approach sometimes worked and sometimes did not -- it depended on the season of year: Oil viscosity is very sensitive to temperature, so in the winter the oil is thick and the purge cycle worked, but in the summer the oil is thin and it did not work. Joe Gwinn I have a Clausing 1501 with the same issues. I followed the viscosity recommendations, rebuilt (new seals) both the vari drive and the "pump" in the headstock...yet time and again I would go to use it..and the change lever would be slack..and it would take 30 minutes to keep pumping and purging the system before it would knock all the air out of the system. Finally I got really really ****ed off..and filled the system with Vactra Medium. Seems to be working just fine now. Speed change levers are a bit harder to turn..but no issues now in 6 months. Gunner - "[F]ar from being the Great Satan, I would say that we are the Great Protector. We have sent men and women from the armed forces of the United States to other parts of the world throughout the past century to put down oppression. We defeated Fascism. We defeated Communism. We saved Europe in World War I and World War II. We were willing to do it, glad to do it. We went to Korea. We went to Vietnam. All in the interest of preserving the rights of people. And when all those conflicts were over, what did we do? Did we stay and conquer? Did we say, "Okay, we defeated Germany. Now Germany belongs to us? We defeated Japan, so Japan belongs to us"? No. What did we do? We built them up. We gave them democratic systems which they have embraced totally to their soul. And did we ask for any land? No. The only land we ever asked for was enough land to bury our dead." General Colin Powell --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
#3
Posted to rec.crafts.metalworking
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Clausing Variable-Speed Drives - DTE24 oil is too thin
In article , Gunner Asch
wrote: On Sat, 18 Apr 2015 13:30:06 -0400, Joe Gwinn wrote: I have had a Clausing 5914 lathe since 2007, and always had problems with the variable-speed drive, and a major problem was that I never could get all the air out of the hydraulic system that is used to control speed. Following Clausing's recommendation of the day, I have been using Mobil DTE24 Hydraulic Oil in the control system and headstock. I tried many things to bleed the air out of the hydraulics, and sometimes I's succeed, but it would not last. I could hear air being aspirated back into the system when I pushed the control wheel to the low-speed limit, so I was just chasing my tail -- all motion, no progress. I was going to solve the aspiration problem by adding an external oil reservoir (like the old cylindrical steel upper hydraulic assemblies) so that the path to the free surface of the oil would be too long for aspiration to be possible, so I inquired on the Clausing list if anybody has a rectangular aluminum upper assembly for sale. This elicited many questions, and a clue. It turned out that oil product names and numbers changed between when the lathe was made (circa 1975) and 2007, and the old oils (Shell Tellus 27 and 33) were not near-equivalents to the similarly-numbered Tellus 22 and 32. What had happened is that the oil industry eliminated the profusion of different ways to measure oil viscosity, and settled upon the ISO Viscosity definitions and grades. The new Tellus product numbers are based on the ISO Viscosity Grades of the oils, and not on whatever had been used before the transition. Clausing Tech Support fell into this trap circa 2007. The effect of the error was that the recommended substitutions were an entire viscosity grade too thin. New (2015) substitutions: Tellus 27 -- ISO VG 46 (Mobil DTE 25, not DTE24). Tellus 33 -- ISO VG 68 (Mobil DTE 26, not DTE25). Changing the oil in the headstock and hydraulic system to DTE25 had a dramatic effect. Now, purging air is easy, requiring one maybe two cycles (versus ten or fifteen, which nonetheless often failed) and the VS system works correctly. And in a welcome surprise, the lathe runs far quieter now. (I also changed the oil in the apron to DTE26, but there was no obvious difference, although it was in any event due for an oil change.) I also now know why the old purge approach sometimes worked and sometimes did not -- it depended on the season of year: Oil viscosity is very sensitive to temperature, so in the winter the oil is thick and the purge cycle worked, but in the summer the oil is thin and it did not work. Joe Gwinn I have a Clausing 1501 with the same issues. I followed the viscosity recommendations, rebuilt (new seals) both the vari drive and the "pump" in the headstock...yet time and again I would go to use it..and the change lever would be slack..and it would take 30 minutes to keep pumping and purging the system before it would knock all the air out of the system. Finally I got really really ****ed off..and filled the system with Vactra Medium. Seems to be working just fine now. Speed change levers are a bit harder to turn..but no issues now in 6 months. Vactra is way too thick. I'd get the correct Mobile DTE25. Headstock wants this too. Although the apron is supposed to use DTE26, DTE25 will work there as well. I used DTE24 in the apron, and nothing bad happened. Joe Gwinn |
#4
Posted to rec.crafts.metalworking
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Clausing Variable-Speed Drives - DTE24 oil is too thin
On Sat, 18 Apr 2015 19:23:17 -0400, Joe Gwinn
wrote: In article , Gunner Asch wrote: On Sat, 18 Apr 2015 13:30:06 -0400, Joe Gwinn wrote: I have had a Clausing 5914 lathe since 2007, and always had problems with the variable-speed drive, and a major problem was that I never could get all the air out of the hydraulic system that is used to control speed. Following Clausing's recommendation of the day, I have been using Mobil DTE24 Hydraulic Oil in the control system and headstock. I tried many things to bleed the air out of the hydraulics, and sometimes I's succeed, but it would not last. I could hear air being aspirated back into the system when I pushed the control wheel to the low-speed limit, so I was just chasing my tail -- all motion, no progress. I was going to solve the aspiration problem by adding an external oil reservoir (like the old cylindrical steel upper hydraulic assemblies) so that the path to the free surface of the oil would be too long for aspiration to be possible, so I inquired on the Clausing list if anybody has a rectangular aluminum upper assembly for sale. This elicited many questions, and a clue. It turned out that oil product names and numbers changed between when the lathe was made (circa 1975) and 2007, and the old oils (Shell Tellus 27 and 33) were not near-equivalents to the similarly-numbered Tellus 22 and 32. What had happened is that the oil industry eliminated the profusion of different ways to measure oil viscosity, and settled upon the ISO Viscosity definitions and grades. The new Tellus product numbers are based on the ISO Viscosity Grades of the oils, and not on whatever had been used before the transition. Clausing Tech Support fell into this trap circa 2007. The effect of the error was that the recommended substitutions were an entire viscosity grade too thin. New (2015) substitutions: Tellus 27 -- ISO VG 46 (Mobil DTE 25, not DTE24). Tellus 33 -- ISO VG 68 (Mobil DTE 26, not DTE25). Changing the oil in the headstock and hydraulic system to DTE25 had a dramatic effect. Now, purging air is easy, requiring one maybe two cycles (versus ten or fifteen, which nonetheless often failed) and the VS system works correctly. And in a welcome surprise, the lathe runs far quieter now. (I also changed the oil in the apron to DTE26, but there was no obvious difference, although it was in any event due for an oil change.) I also now know why the old purge approach sometimes worked and sometimes did not -- it depended on the season of year: Oil viscosity is very sensitive to temperature, so in the winter the oil is thick and the purge cycle worked, but in the summer the oil is thin and it did not work. Joe Gwinn I have a Clausing 1501 with the same issues. I followed the viscosity recommendations, rebuilt (new seals) both the vari drive and the "pump" in the headstock...yet time and again I would go to use it..and the change lever would be slack..and it would take 30 minutes to keep pumping and purging the system before it would knock all the air out of the system. Finally I got really really ****ed off..and filled the system with Vactra Medium. Seems to be working just fine now. Speed change levers are a bit harder to turn..but no issues now in 6 months. Vactra is way too thick. I'd get the correct Mobile DTE25. Headstock wants this too. Although the apron is supposed to use DTE26, DTE25 will work there as well. I used DTE24 in the apron, and nothing bad happened. Joe Gwinn It may be too thick..but it works and doesnt bleed out. The headstock and apron of course all run the proper oils. I was purely miserable about having to bleed that ******* every time I wanted to use it. So it may be the wrong stuff...it works for me. Gunner --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
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