[modeleng] Re: De magnatizer
- From: "Dennis Jewitt" <dennis.jewitt@xxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Thu, 31 Mar 2005 08:20:23 +0100
Stan,
I had this problem in a big way a couple of years ago as the
magnetism spread from tool to tool until many of them developed beards !
For a small demagnetiser someone suggested that old washing
machine/dishwasher solenoid valve coil. I found a brilliantly simple
solution in an old ME that has worked extremely well. All you need is an
old mains transformer (mine had a 6V 5A secondary). Clamp it in the miller
vice across the bottom laminations, with the axis of the two coils vertical.
Mill a couple of slots about half inch wide and nearly as deep as the
laminations, across the top run of the laminations. These should be about
central between the outer and central vertical runs of laminations. I
clamped a couple of pieces of hardwood to back up the laminations before
milling and all went well. Pieces of hardwood are then epoxied into the
slots and a simple case built.
The demagnetising effect is very powerful and the transformer does not get
hot in use. In fact the article mentioned that the secondary could still be
used, though I have not done so. Let me know if you would like a sketch
and photos sent off list.
Dennis Jewitt
Kent UK
----- Original Message -----
From: "Stan Spencer" <ener93@xxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, March 30, 2005 8:29 PM
Subject: [modeleng] De magnatizer
> Hi All.
> I have a problem with equipment such as screw drivers, lathe tools, drills
etc. becoming magnetised.
> Has anyone got a circuit diagram and how to build a demagnetiser, The hole
size need only be about 1 1/2" square.
> I am hoping that some one can explain how, on paper. IE wire sizes,and
what to wind the wire around !
> Stan (Camborne).
> MODEL ENGINEERING DISCUSSION LIST.
>
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