Are there any downsided to cutting (scalloping) a small piece out of a soft magnet?
My wife bought a magnetic seam guide as per
I'm looking at about 1mm depth for about 25mm length and 10mm width to clear the feed dogs and was going to use a metal file unless someone has a better idea.
Is it completely soft? In which case it is presumably a rubbery polymer heavily loaded with iron oxide and then magnetised. You could use a file, or sandpaper, or even perhaps a stanley knife.
The problem might be if it has small rare earth magnets embedded in it, and these won't be so easy to trim. Should be easy to tell by exploring with something like iron filings or small tacks. The magnetic "hot spots" will be obvious.
Yes, it's a slab as per the ebay picture of about 4" x 1.25" x .125" thick, evenly magnetised. There seems to be very little on the internet that I can find but yes it is a rubbery polymer as far as I understand, and the magnetism is even across it's surface.
So just treat it as plastic then seems to be the order of the day.
It's an expensive way to buy a strip of eg...
SWMBO, but it is also too rigid to be called tape even if it is a bit flexible..
I was curious as to why I could not use another, smaller, polymer magnet to put against it and get them to repel, sort of one to "float" above the other.
Has she not got a foot that guides seams?
How about, instead of removing some of the material, add some! Imagine sticking on a layer, or two, or three, of something like insulation or masking tape over part of the magnetic guide. Whatever is needed to clear the feed dogs.
Unless the direction of the magnetic field matters its cutable. I have some of that floppy stuff which are offcuts from bigger signs etc, and you can cut those with scissors and they still remain magnetic.. I think its some kind of powder. Brian
Self-adhesive, stuck to a bit of card or plastic.
They have alternating north and south poles in 'stripes' with a pitch of maybe a couple of millimetres or so. If you take two identical ones, faces together, you'll find that they 'cog' as you slide one past the other, as the multiple poles line up to attract then repel.
The back side has very little external field by design - that's what a Halbach array does, it pushes most of the field out one side.
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