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More lathe gadgets
micktoon:
Hi Lads , Well Gingernut was sort of correct about the magnetic field leeching into things as when i have come to use the DTI's they were not returning properly as they had been when tested.
So phase two was needed, the plan to space the magnets away from the DTI's with a plastic bar spacer.
Not sure what type of plastic is is but stinks when turned in the lathe.
Recessed the bottom for the magnets to sit in which turned out to be mistake in the end.
To get one of the magnets off the rear of the DTI I had to heat it slightly with pencil flame, I found out this spoils the magnet ( turns it into metal disc not magnet lol ) so after glueing the magnets in found one no longer was a magnet and the other was not sitting dead square so although it stuck, it would pivot on the most raised part.
I am starting to get bored with this project now so tried sticking another magnet ontop of the dead magnet and it worked, then tested a second magnet ontop of the still magnetic magnet on the other DTI and it was again effecting the DTI so heated the glued magnet to kill it , then glued new magnet ontop and they both eventually work
So I think and hope that is job done this time !
Cheers Mick.
AussieJimG:
Here is a cheap alternative to using a DTI: http://start-model-engineering.co.uk/machines-and-tooling/minilathe/micro-dro/
Jim
Ginger Nut:
--- Quote from: AussieJimG on March 17, 2015, 07:36:27 PM ---Here is a cheap alternative to using a DTI: http://start-model-engineering.co.uk/machines-and-tooling/minilathe/micro-dro/
Jim
--- End quote ---
Jim top idea especially as The Big Green Shed has digital cheap vernier for around $7
vtsteam:
Many tools in my big shop have become magnetized and as far as I know I use very few magnets. I do have one of those little plastic rattle de-magnetizers, but that only works on small tools. Now I'm trying to reduce magnet use in the shop except where absolutely necessary.
It's a real problem preventing swarf and iron dust from sticking to things they shouldn't. Bearing surfaces, tapers, threads, etc.. I'm not sure why I haven't had this problem in the past, but it is definitely present now. Now many store bought items have convenience magnets attached .. maybe that's part of it. This doesn't seem to be a problem for others on the forum, so I can't explain why it's happening in my own shop, but it is an issue for me.
BillTodd:
--- Quote from: vtsteam on March 19, 2015, 09:12:52 AM ---Many tools in my big shop have become magnetized and as far as I know I use very few magnets. I do have one of those little plastic rattle de-magnetizers, but that only works on small tools. Now I'm trying to reduce magnet use in the shop except where absolutely necessary.
It's a real problem preventing swarf and iron dust from sticking to things they shouldn't. Bearing surfaces, tapers, threads, etc.. I'm not sure why I haven't had this problem in the past, but it is definitely present now. Now many store bought items have convenience magnets attached .. maybe that's part of it. This doesn't seem to be a problem for others on the forum, so I can't explain why it's happening in my own shop, but it is an issue for me.
--- End quote ---
It is worth avoiding magnet where unnecessary , if they don't magnetize the machine , they will magnetize the swarf making it hard to clean things.
Use big coil of copper wire (e.g the demag loop from an old CRT monitor or telly ) and carefully and slowly wave it over the object to be demagnetized , then without switching off move several feet away turn the coil 90 degrees then switch off.
The idea is to magnetize alternatively one way and the other using the AC coil while slowly reducing the magnetic field (by moving away) this should leave the the object randomly magnetized and thus demag'ed
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