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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
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mag base remagnetizing
On 15/3/20 8:25 am, Cydrome Leader wrote:
Has anybody remagnetized a rotary on-off mag base before? I was thinking about a large capacitor and some turns of wire on EI transformer core with the Is removed and the indicator base across the center and one side leg. How are these magnetized at the factory? Is this a mag base to mount an antenna on a car roof? Why not get a bunch of old hard drive (rare earth) magnets, and just epoxy them onto the bottom of the existing mag base, and cover with some thin felt for protection? Clifford Heath |
#2
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mag base remagnetizing
On Wed, 25 Mar 2020 17:47:35 +1100, Clifford Heath
wrote: On 15/3/20 8:25 am, Cydrome Leader wrote: Has anybody remagnetized a rotary on-off mag base before? I was thinking about a large capacitor and some turns of wire on EI transformer core with the Is removed and the indicator base across the center and one side leg. How are these magnetized at the factory? Is this a mag base to mount an antenna on a car roof? Why not get a bunch of old hard drive (rare earth) magnets, and just epoxy them onto the bottom of the existing mag base, and cover with some thin felt for protection? Clifford Heath I was thinking he was talking about a mag base for a dial indicator. |
#3
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mag base remagnetizing
"Clare Snyder" wrote in message
... On Wed, 25 Mar 2020 17:47:35 +1100, Clifford Heath wrote: On 15/3/20 8:25 am, Cydrome Leader wrote: Has anybody remagnetized a rotary on-off mag base before? I was thinking about a large capacitor and some turns of wire on EI transformer core with the Is removed and the indicator base across the center and one side leg. How are these magnetized at the factory? Is this a mag base to mount an antenna on a car roof? Why not get a bunch of old hard drive (rare earth) magnets, and just epoxy them onto the bottom of the existing mag base, and cover with some thin felt for protection? Clifford Heath I was thinking he was talking about a mag base for a dial indicator. https://www.amazon.com/Indicators-St...ode=4989304011 The rotary switch that turns the magnetic pull on or off is essential for many machinist uses. |
#4
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mag base remagnetizing
On 26/3/20 8:47 am, Jim Wilkins wrote:
"Clare Snyder" wrote in message ... On Wed, 25 Mar 2020 17:47:35 +1100, Clifford Heath wrote: On 15/3/20 8:25 am, Cydrome Leader wrote: Has anybody remagnetized a rotary on-off mag base before? I was thinking about a large capacitor and some turns of wire on EI transformer core with the Is removed and the indicator base across the center and one side leg. How are these magnetized at the factory? Is this a mag base to mount an antenna on a car roof? Why not get a bunch of old hard drive (rare earth) magnets, and just epoxy them onto the bottom of the existing mag base, and cover with some thin felt for protection? Clifford Heath I was thinking he was talking about a mag base for a dial indicator. https://www.amazon.com/Indicators-St...ode=4989304011 The rotary switch that turns the magnetic pull on or off is essential for many machinist uses. Yes, right, I've used those also. It wasn't clear which you meant though. |
#5
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mag base remagnetizing
"Clifford Heath" wrote in message
... On 26/3/20 8:47 am, Jim Wilkins wrote: "Clare Snyder" wrote in message ... On Wed, 25 Mar 2020 17:47:35 +1100, Clifford Heath wrote: On 15/3/20 8:25 am, Cydrome Leader wrote: Has anybody remagnetized a rotary on-off mag base before? I was thinking about a large capacitor and some turns of wire on EI transformer core with the Is removed and the indicator base across the center and one side leg. How are these magnetized at the factory? Is this a mag base to mount an antenna on a car roof? Why not get a bunch of old hard drive (rare earth) magnets, and just epoxy them onto the bottom of the existing mag base, and cover with some thin felt for protection? Clifford Heath I was thinking he was talking about a mag base for a dial indicator. https://www.amazon.com/Indicators-St...ode=4989304011 The rotary switch that turns the magnetic pull on or off is essential for many machinist uses. Yes, right, I've used those also. It wasn't clear which you meant though. I didn't specify the magnet or how to build the coil because I don't have that sort of experience, beyond being an operator. https://www.versci.com/cwnmr/index.html The solid cabinet holds the huge electromagnet and the desktop is a pen plotter for the output. "This is also the basis of magnetic resonance imaging (MRI.). It should be called "NMRI" but some people don't like that word "nuclear." "Signal averaging often meant scanning overnight." Actually the output was quite clean after I spent half an hour fine-tuning the machine. The 14,092 Gauss magnetic field needed to be uniform across the sample to within something like 1 part in a billion. Earth's magnetic field is about 1/2 Gauss. As the only undergrad with an NSF summer research grant I was assigned the after-midnight shift. After a few nights I got used to walking the streets of a dark, deserted world. |
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