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.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old March 25th 20, 06:47 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jul 2006
Posts: 174
Default 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   Report Post  
Old March 25th 20, 07:54 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Nov 2017
Posts: 3,327
Default 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   Report Post  
Old March 25th 20, 09:47 PM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jun 2011
Posts: 5,571
Default 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   Report Post  
Old March 26th 20, 02:58 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jul 2006
Posts: 174
Default 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   Report Post  
Old March 26th 20, 11:50 AM posted to rec.crafts.metalworking
external usenet poster
 
First recorded activity by DIYBanter: Jun 2011
Posts: 5,571
Default 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.




Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mag base remagnetizing [email protected] Metalworking 34 March 25th 20 12:01 PM
Mighty Mag Magnetic Base Modifications? Clark Magnuson Metalworking 11 June 28th 05 08:25 AM
Mag-base ball-joint indicator holder rlincolnh Metalworking 0 March 26th 05 02:53 AM
Wood Mag. Mobile Tool Base klklimes Woodworking 2 January 10th 04 06:09 PM
Noga Mag Base Kent Frazier Metalworking 1 July 23rd 03 04:53 AM


All times are GMT +1. The time now is 11:28 PM.

Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"

 

Copyright © 2017