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Magnetic swarf

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steamdave03/05/2021 16:23:34
492 forum posts
39 photos

Many folk use magnetic bits such as magnetic DTI holders and the like on their machines. In time there must be a build up of magnetism in the machine which in turn attracts the ferrous swarf.

I've studiously avoided the use of magnetic equipment on my machines until recently when I started using a magnetic holder for a DTI.

So, how do people de-magnetise their machines, or do they not bother?

The Emerald Isle

mark costello 103/05/2021 16:44:17
677 forum posts
12 photos

Never had a problem.

Tony Pratt 103/05/2021 17:06:49
1767 forum posts
10 photos

Not a problem


Howard Lewis03/05/2021 17:16:25
5562 forum posts
13 photos

Not aware of a problem after 17 or more years with lathe and Mill.

I use a stick magnet in a copper tube to pick up ferrous swarf to get rid of.


Jon Lawes03/05/2021 17:17:14
700 forum posts

That sounds very much like a non-problem.

steamdave03/05/2021 17:27:19
492 forum posts
39 photos

OK. Thanks for putting my mind at rest.

The Emerald Isle

Brian Wood03/05/2021 17:32:59
2475 forum posts
39 photos

Cast iron does not hold residual magnetism in the same way as steel does which may explain why it is not noted as a problem with DTI mounts on such surfaces.

Regards Brian

Joseph Noci 103/05/2021 17:49:20
1013 forum posts
1253 photos

Irritatingly, I have had chuck jaws ( the hard type) become magnetic and then it's a pain clearing the fine swarf from the jaws when inserting the workpiece. Likewise tool steel lathe cutters, and some milling cutters and even the hard steel capscrews in the tool-holder. This only occurs in the hard steel bits on the lathe - I have never had issues with the lathe structure. I am not sure how, for example, the chuck jaws, become magnetic but they do so repeatedly. I demag all the bits with a homebrew demagnetiser, and all is well for a few weeks. There is that high-school science trick where you align a hard steel rod say North/South, hold it so and smack the one end with a hammer a dozen strokes - it becomes magnetic - maybe I should stop smacking the lathe so hard....


Samsaranda03/05/2021 19:31:35
1254 forum posts
5 photos

Are you sure that your lathe is pointing North/South then? Dave W

Tom Sheppard03/05/2021 20:35:04
31 forum posts

Yes, it is hung from a rope so it aligns magnetically.

old mart03/05/2021 20:55:12
3418 forum posts
210 photos

I have never noticed any adverse affects, in fact using lots of magnets when machining cast iron helps to control the mess.

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