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Post by ettingtonliam on Aug 8, 2019 6:48:02 GMT
I was very pleased with myself many years ago when I succeeded in spinning the copper top for the chimney on my 4" scale Tasker steam tractor.
I used an aluminium former to do the job, but totally forgot about how it was to be removed on completion!
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Post by Roger on Aug 8, 2019 6:56:16 GMT
I was very pleased with myself many years ago when I succeeded in spinning the copper top for the chimney on my 4" scale Tasker steam tractor. I used an aluminium former to do the job, but totally forgot about how it was to be removed on completion! Ah yes, that sort of thing is familiar to me. I'm guilty of not always thinking through how I'm going to complete the whole job, especially about how to hold a tricky shape. I've also designed things that can't be assembled. It's all part of being human, so it's best to forgive yourself and move on!
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Post by ettingtonliam on Aug 8, 2019 13:21:19 GMT
I ended up boring out the aluminium to match the taper of the chimney, and fitted the copper cap complete with aluminium core. It did mean that the copper cap was far more resistant to accidental denting!
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Post by Roger on Aug 8, 2019 16:32:03 GMT
I ended up boring out the aluminium to match the taper of the chimney, and fitted the copper cap complete with aluminium core. It did mean that the copper cap was far more resistant to accidental denting! I love it! Lateral thinking when others would have been so determined to get it out that they might have scrapped it.
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Post by Roger on Aug 11, 2019 20:52:24 GMT
The mill is finally back up and running and the homing for software limits is working as it should. So it's time to return to the business of attaching the magnets to the window frames. I wasn't happy with the method I was using, the magnets weren't sitting flat, and they were not set deeply enough into the pockets. So here's a fixture to allow me to attach all 8 magnets in one gluing session... 20190811_164505 by Anne Froud, on Flickr ... it's a piece of 1/4" Perspex with a raised registration part in the middle that's sitting 0.8mm above the surface. There are 2.05mm drilled holes in the locations where the magnet pockets are. 20190811_165659 by Anne Froud, on Flickr This is the frame upside down with the face for the magnets against the fixture... 20190811_165733 by Anne Froud, on Flickr ... and the way up it needs to be to fit the magnets. The idea of making it transparent is so I can see what's going on at the joint. 20190811_165741 by Anne Froud, on Flickr I set up the fixture again (this is why the square around the outside is exactly central to the fixture details) and the pockets were machined to be 0.1mm diameter larger and the depth increased from 0.25mm to 0.35mm ( the magnets are 0.5mm thick) 20190811_194524 by Anne Froud, on Flickr The magnets, 2mm pieces of Silver Steel and the frames were soaked in Acetone for 20 minutes by dipping the container in the warm ultrasonic tank with it on. The container was covered to stop the Acetone from evaporating. The Silver Steel rods were turned flat on both ends. A tiny blob of Superglue was carried on a wire to the pockets and the fixture dropped over the frame. Then magnets were slid off the end of the pile one by one (in the same direction) and put onto the end of each rod. They were pushed down into the holes and pressed firmly. Looking closely, they all seem to be located correctly, so hopefully this will work out better. There's more contact area on the sides of the magnets this time, so they will hopefully stick a bit more firmly. One or two that were at an angle came off pretty easily. The best ones had to be pulled off with a pair of pliers. 20190811_213501 by Anne Froud, on Flickr
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Post by coniston on Aug 11, 2019 21:41:05 GMT
Love the innovation Roger.
Chris D
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Post by 92220 on Aug 12, 2019 8:07:52 GMT
Nice one Roger. Clever idea!! I must remember it.
Bob.
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Post by silverfox on Aug 12, 2019 11:10:41 GMT
Roger When i think i have seen it all with your methods. up you pop like a rabbit out of a hat, with some more.. Excellent. Methinks i will have to change reading time of your log to about 23.00 when it will be too late to get into the shed!!
(Expecting post telling me Rogers shed is 100% soundproof and he is in it 24/7)
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Post by 92220 on Aug 12, 2019 12:44:52 GMT
No No No No. With the amount of work Roger puts out I think he works on a different time scale to us mortals...........Not 24/7 but 30/7!!!
Bob.
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Post by silverfox on Aug 12, 2019 18:36:38 GMT
I bet he has that Beatles song going non stop!
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Post by andyhigham on Aug 12, 2019 18:56:03 GMT
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Post by Roger on Aug 12, 2019 20:43:27 GMT
Ok, there are a couple of issues that need addressing with the window frames. Bonding the magnets at the right level is tricky because the glue can't escape easily enough if there's too much in there. The force holding the frame would be adequate except for the fact that when you go to open the window, you tend to press against the glass when pulling on the handle. Doing this levers the glass away a bit too easily for my liking. I've modified the design so that there are now ears on the sides of the pockets so that the glue has somewhere to go. I've also added more magnets to boost the amount of force required to separate the parts. I'm very happy with the way the frame locates. Even without the magnets engaging with the pockets. I reckon there would be enough centralising force due to the magnets. I'm sure this is going to be a satisfactory solution with the proposed changes. Untitled by Anne Froud, on Flickr
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Post by delaplume on Aug 12, 2019 23:59:33 GMT
Wasn't that some rare shots of Brian Epstein there as well.........( I think ?? ) Hi Roger, What with your "Magnetic" windows,.........3D plastic printed backhead and "Stick" milling etc, I'm looking forwards to your Bio-Mass convertion kit in lieu of coal !! LoL !!
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Post by 92220 on Aug 13, 2019 8:02:51 GMT
Yes there were a couple of shots of Brian Epstein. Rare, as you say, because he hated having his photo taken.
Bob.
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Post by silverfox on Aug 13, 2019 11:05:17 GMT
I fully expect him to have the coal milled so if fits perfectly in the coal bunker and grate!!! Painting it white may be expecting tooooo much
( Roger, that was said very tongue in cheek)
Oh and for all the 'sinister' people out there MDRO are selling left hand digital calipers today.6 and 12 inch Something i have wanted for years!! order placed. Might even be useful for all you weird right handers out there
Anyway just remember..... Everyone is born right handed. Only the gifted overcome it
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Post by andyhigham on Aug 13, 2019 11:22:04 GMT
Left handed digital calipers would be easier to use than right handed on the lathe
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Post by silverfox on Aug 13, 2019 12:47:43 GMT
Andy That is a Double plus for me!! and at 25.00 it really is a no brainer...they do a 12 inch one for 57.00
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Post by Roger on Aug 13, 2019 16:08:07 GMT
Left handed digital calipers would be easier to use than right handed on the lathe Calipers on the lathe! Whatever next! Micrometers please...
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Post by silverfox on Aug 13, 2019 16:30:47 GMT
Roger
When Mdro do left handed ones......... Unitl then the minority have to abide with what the majority use lol
Ron
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Post by andyhigham on Aug 13, 2019 19:08:43 GMT
You can't measure the bottom of a groove with a micrometer. OK you can use the DRO
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