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aesmith

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About aesmith

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  1. Here we go ... Carbon steel tweezers before, tested by dipping into the metal dust ... And cleaning the dust off, a quick twirl of the thing, then another dip. I can get them a little better, but not completely zeroed out as I can with the stainless tweezers ...
  2. I was going to post images of before and after, but it won't let me do so. Not sure why as I've posted images from Flickr before.
  3. Needs some more testing and practice I think, in particular since magnetic fields fall off really quickly with distance I suspect the movement away needs to be very slow for the first inch or so. I have one pair of tweezers which are not stainless and are very prone to magnetisation, and which I couldn't completely demagnetise, those will be the ones to test with. How are you testing for magnetism before and after? I was using metal dust picked up from under the vice in the garage but it's just occurred to me that the dust itself may be magnetic as well.
  4. The idea is to apply a reversing magnetic field, so I don't think it's the spin itself that does it, it's the fact that the tool sees the magnetic field alternating between two polarities. "Normal" demagnetiser use the mains to create a field that switches back and forth 50 times a second. To exactly replicate that with my four magnet rig I'd need to spin it at 1500 rpm, but my test twiddling with my fingers suggests it doesn't need to be that fast.
  5. Just a quick update, I was dressing the tips of a couple of screwdrivers and tweezers yesterday, and of course most became magnetised in the process. Since I'd put the cordless drill away, I tried twirling the demagnetiser between my fingers and found that worked perfectly well. I've just received my new smaller round magnets so I think when I replace my rough first draft I'll use a smaller diameter shaft specifically with handheld use in mind. Maybe six magnets, compared to the four in my first one.
  6. Alt I can't imagine ever buying a Rolex, but it's encouraging to see the big names releasing more small watches. Hopefully this idea will trickle down to more affordable makes.
  7. Judging by how hard it tugged at my tools I don't think I'd want to put a watch near to mine. Anyway I've ordered some more magnets and I'm going to build a slicker version now I know it works, with a flush face of some sort so I can start with the items right up against it if I wish. Maybe six magnets, but I also think the number might not matter, just need to spin faster if there are fewer magnets. Edit I was looking for inherently non-magnetic tweezers on Ebay, and was surprised to find some actually advertised as magnetic, so clearly it's a good thing for some people.
  8. When I first heard about them, praised as the ultimate in functional watches, I expected to see something with super legible dial as well as all the durability. In reality the design of the dials looks like appearance and novelty are the main aims, with readability pretty low down the priorities.
  9. Depends how you want to use the watch. I just wear whatever I had on before deciding to go for a ride. However once when I tried to time my pedalling I found that the second hand was really hard to read, which isn't the case with that watch in normal wear, so for me I'd be looking for readability in any sort of light.
  10. It works! I didn't make anything as posh as yours. I used 3/8" plywood, around 2 1/2" square, a 1/4" both through the middle as a mandrel (is that the right word) and four 10mm holes at 90 deg intervals around 20mm from the centre, the magnets a push fit into the holes. I say around because none of this was measured. I span it in a cordless drill and it successfully demagnetised two of my three pairs of tweezers, my springbar tool and some screwdrivers. The third pair of tweezer remained very slightly magnetic even after several goes. It's a weird feeling, the magnets tugging at the t
  11. Might try that, I have some small magnets in the workshop. How fast do you spin it, and do you mount the magnets in alternating orientations?
  12. Hi, I found to my dismay that it seems all my small tools have become magnetised for some unknown reason. I see you can get quite cheap things that claim to demagnetise, looking like plastic blocks with slots, like this ... https://www.ebay.co.uk/itm/Magnetiser-Demagnetiser-Tool-Mini-Toolbox-Essential-Screws-Screwdriver-Repair/114283439821?hash=item1a9bd2e6cd:g:OnQAAOSwGQlfAMjj Is anything like that any use? If not then what would be recommended, to demagnetise small tools not necessarily anything you'd put a watch anywhere near? Thanks, TS
  13. Those two photos show why I don't like big watches. I like them to be covered by my cuffs except when I'm actually reading them. My watches get a hard enough time as it is, if exposed all the time like that they'd be dinged to hell in no time.
  14. I guess the bezel is a cool gadget. I did wonder why divers wouldn't want it numbered the other way round, as a count-down. Set maximum dive time on the bezel against the minute hand, then when the minute hand reads zero on the bezel your time is up. Rather than counting up and then wondering "well it's showing I've been down for 20 minutes, but I can't remember if I worked out max time as 20 or 25 minutes"
  15. Thanks for all the suggestions. That Alpha Explorer looks a possibility, I like that style.
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