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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sizing a Bench Grinder Capacitor
Have a bench grinder that was given to me and runs fine if you spin it
up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? Thanks in advance. |
#2
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Sizing a Bench Grinder Capacitor
"leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? |
#3
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Sizing a Bench Grinder Capacitor
Homer J Simpson wrote: "leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM |
#4
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Sizing a Bench Grinder Capacitor
"leoJ" wrote in message
ups.com... Homer J Simpson wrote: "leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM Likely a motor start capacitor. http://www.cde.com/new/catalog/motorstart/ CDE motor start capacitor catalog page (download this - right mouse click - Adobe Acrobat) http://www.cde.com/catalogs/PSU.pdf I am looking at a NOS Mallory motor start capacitor on my bench -- it is rated at: 108-130 mfd at 250 VAC Application Guide http://www.cde.com/catalogs/AEappGUIDE.pdf gb |
#5
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Sizing a Bench Grinder Capacitor
"w9gb" writes:
"leoJ" wrote in message ups.com... Homer J Simpson wrote: "leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM Likely a motor start capacitor. http://www.cde.com/new/catalog/motorstart/ CDE motor start capacitor catalog page (download this - right mouse click - Adobe Acrobat) http://www.cde.com/catalogs/PSU.pdf I am looking at a NOS Mallory motor start capacitor on my bench -- it is rated at: 108-130 mfd at 250 VAC Application Guide http://www.cde.com/catalogs/AEappGUIDE.pdf If it's used only for starting. Easiest test would be to spin it up by hand and then use a multimeter to check for voltage across the wires where the cap would go. If you see full line voltage, it's a run cap. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#6
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Sizing a Bench Grinder Capacitor
Sam Goldwasser wrote in
: "w9gb" writes: "leoJ" wrote in message ups.com... Homer J Simpson wrote: "leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM Likely a motor start capacitor. http://www.cde.com/new/catalog/motorstart/ CDE motor start capacitor catalog page (download this - right mouse click - Adobe Acrobat) http://www.cde.com/catalogs/PSU.pdf I am looking at a NOS Mallory motor start capacitor on my bench -- it is rated at: 108-130 mfd at 250 VAC Application Guide http://www.cde.com/catalogs/AEappGUIDE.pdf If it's used only for starting. Easiest test would be to spin it up by hand and then use a multimeter to check for voltage across the wires where the cap would go. If you see full line voltage, it's a run cap. snip waste text Most bench grinders I've seen use a motor run capacitor. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#7
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Sizing a Bench Grinder Capacitor
me wrote:
Sam Goldwasser wrote in : "w9gb" writes: "leoJ" wrote in message groups.com... Homer J Simpson wrote: "leoJ" wrote in message legroups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM Likely a motor start capacitor. http://www.cde.com/new/catalog/motorstart/ CDE motor start capacitor catalog page (download this - right mouse click - Adobe Acrobat) http://www.cde.com/catalogs/PSU.pdf I am looking at a NOS Mallory motor start capacitor on my bench -- it is rated at: 108-130 mfd at 250 VAC Application Guide http://www.cde.com/catalogs/AEappGUIDE.pdf If it's used only for starting. Easiest test would be to spin it up by hand and then use a multimeter to check for voltage across the wires where the cap would go. If you see full line voltage, it's a run cap. snip waste text Most bench grinders I've seen use a motor run capacitor. But if he has to spin it to start it, that would imply it's just a starting capacitor. Can you hear an audible click as it picks up speed and again just as it slows to a stop? |
#8
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Sizing a Bench Grinder Capacitor
"leoJ" wrote in message
ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? Thanks in advance. Do you have a mfg. or model number for this bench grinder? gb |
#9
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Sizing a Bench Grinder Capacitor
James Sweet writes:
me wrote: Sam Goldwasser wrote in : "w9gb" writes: "leoJ" wrote in message ups.com... Homer J Simpson wrote: "leoJ" wrote in message legroups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? HP? 3/4 HP, 3600 RPM Likely a motor start capacitor. http://www.cde.com/new/catalog/motorstart/ CDE motor start capacitor catalog page (download this - right mouse click - Adobe Acrobat) http://www.cde.com/catalogs/PSU.pdf I am looking at a NOS Mallory motor start capacitor on my bench -- it is rated at: 108-130 mfd at 250 VAC Application Guide http://www.cde.com/catalogs/AEappGUIDE.pdf If it's used only for starting. Easiest test would be to spin it up by hand and then use a multimeter to check for voltage across the wires where the cap would go. If you see full line voltage, it's a run cap. snip waste text Most bench grinders I've seen use a motor run capacitor. But if he has to spin it to start it, that would imply it's just a starting capacitor. Can you hear an audible click as it picks up speed and again just as it slows to a stop? No, a split phase induction motor with an open or missing cap will not start regardless of whether it is a start or run cap. Spinning by hand will get it going (assuming minimal load). An induction motor designed to have a run cap will still run without one if started manually but won't have rated torque. An induction motor designed to have a start cap will still run without one if started manually and will have rated torque. The main functional difference is that the start cap is not rated for continuous operation and is removed from the circuit once the motor reaches about 75 percent of operating speed. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#10
Posted to sci.electronics.repair
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Sizing a Bench Grinder Capacitor
"w9gb" wrote in
: "leoJ" wrote in message ups.com... Have a bench grinder that was given to me and runs fine if you spin it up by hand - the capacitor is missing. Is there a way to determine what size/part no. capacitor will work with a 115V 60Hz Single Phase motor? Thanks in advance. Do you have a mfg. or model number for this bench grinder? gb Central Machinery Industrial #36127 |
#11
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Sizing a Bench Grinder Capacitor
Central Machinery Industrial #36127 is what it says on the label. |
#12
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Sizing a Bench Grinder Capacitor
Hope this doesn't end up getting posted 3 times - having trouble
sending.... Central Machinery Industrial #36127 |
#13
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Sizing a Bench Grinder Capacitor
nowan wrote:
Hope this doesn't end up getting posted 3 times - having trouble sending.... Central Machinery Industrial #36127 Central Machinery is sold by Harbor Freight Tools, Inc. They may still have the manual on file. http://www.harborfreight.com/ -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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