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dian
05-09-2010, 04:51 AM
hi, i want to attach a splash shield to my milling table using magnets. but am afraid to magnetise the whole table. there would be 7 - 9 23 kg magnets. does anybody have any experience?

duckman
05-09-2010, 08:49 AM
Why not just make brackets that clip into the T slots. Then you wouldn't have to worry about chips being attracted to the magnets. :D

polepenhollow
05-09-2010, 08:51 AM
If the table is cast iron, you won't permanently magnatize it.
K Liv

dian
05-09-2010, 12:16 PM
no chips on magnets, they would be on the sides of the table behind the shield.

tried it out today, works perfectly, easy to put on and remove.

so i wont magnesise cast iron, but what about the vice, dividing head, clamps, indicators?

i hear/read about whole shops having been magnetised by strong magnets being around for a longer period of time. neodyme are succers.

what do you think?

Rex
05-09-2010, 11:13 PM
We want to see your splash shield :)

dian
05-10-2010, 09:41 AM
http://i973.photobucket.com/albums/ae218/romandian/mkbohrer005.jpg

the shield is somewhat invisible, but you can see the magnets. theres 8 of them.

BillTodd
05-10-2010, 09:50 AM
You could reduce the stray magnetic field (and hence the tendency to magnetise all and sundry) by fitting the magnets inside iron or steel 'pots' (i.e. a pocket) with a non-magnetic (Al/brass/copper) spacer around the magnet . This will concentrate the field to the open/table end. You may also find you could get away with smaller magnets this way.

Bill

[edit] like Frank Ford's pick-up device here:
http://www.frets.com/HomeShopTech/Magnets/MagPickupTool/magpickuptool.html

Frank Ford
05-10-2010, 10:39 AM
For what it's worth, I use neodymium magnets all over the shop - to hang notes, tools, shields, and for setups. Never had a problem with accidentally magnetizing big stuff. Small things like parallels can start to attract chips, but I just demag them like I do my other tools as needed.

Near the top of this page there are a dozen more uses:

http://www.frets.com/HomeShopTech/hstpages.html

dian
05-10-2010, 11:41 PM
concerning the "steel pots": so it doesnt really matter how thick the non magnetic insulation is?