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The Water Cooler / Re: Mystery Objects
« Last post by vtsteam on January 26, 2021, 10:51:20 AM »
It's a plow plane iron. Some types not shown do not have the hook at the top.
Please see bottom two pics
CNC / Re: DIY Laser cutter/engraver design advice
« Last post by MetalMagus on January 26, 2021, 07:13:14 AM »
I quite like the look of the guiderail sets from Cloud Ray. But they still use a drive shaft and a single stepper drive.

One day I may get around to building one of my own


New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by mattinker on January 26, 2021, 07:04:19 AM »

I only have Argon, as I've don't use my Mig, most of my life I only had a stick welder! The Mig is up for sale, it a very good 400amp welder, withe a sattelite on 10meters of cable!

Olfoundry man's de-gasser does exactly that, it has two disks (mine are cast iron) bolted together with radial lines scratched into one of them, , the argon is fed from the centre between the two discs the scratches are a few 1/100 of a mm which gives very fine bubbles which apparently pick up the hydrogen more easily. When I get to my air bearing project, I'm going to try using one of the off cuts of graphite to try bubbleing the Ag through.

Frankly, I don't think you'll need it with the induction furnace.

The Water Cooler / Re: Mystery Objects
« Last post by PekkaNF on January 26, 2021, 05:32:23 AM »
Third pic, one in the bottom looks to me somewhat like marking knife for woodworking...there are many designs. Some are to hold like a pen, some like a brush and some just liiks decorative, buta are actually hard to use.
New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by awemawson on January 26, 2021, 04:42:14 AM »
Matthew I used to de-gas aluminium alloys with a simple Argon probe. A length of 15 mm stainless steel  plumbing pipe, flattened to seal it at the 'hot' end, with a few 1 mm holes drilled in. Probe connected via flexible pipe to Argon regulator which I set to just bubble up through the melt.

In fact this is why for many years I used straight Argon for mig welding - I was too tight to rent two cylinders! I now have returned the Argon cylinder and have Argoshield which is much nicer for welding but I doubt that it would de-gas aluminium !
The Water Cooler / Re: Mystery Objects
« Last post by vtsteam on January 25, 2021, 05:11:03 PM »
Maybe it's for picking up litter.
The Water Cooler / Re: Mystery Objects
« Last post by RussellT on January 25, 2021, 04:14:50 PM »
Thanks John, yes I've seen similar tools, but much tougher than this.

I guess it will have to remain a mystery.

Metal Stuff / Re: Electro Engraving Problems
« Last post by PekkaNF on January 25, 2021, 04:00:19 PM »
Apparently white vinegar works for aluminium:

I too have ben working with some laser print transfer materials. I used to use standard HP printer with standard HP color cadridge and no paper would work with it. However brand print trancparency film worked fine, but need a clothes iron to transfer image. Standard laminator just does not have enough heat, I read from several sources that you need 180C to fuse the dye.

I still have the same old lasr printer and bought a new color cadridge, not HP and not the cheapes one, but mid priced generic. Transparency film does not work any more, but fun fact is that super glossy and coated paper works almost fine with a the same laminator.

I got some chinese yellow transfer paper and it seems to work most of the time ok. Not great for surface mout but ok with trough hole system.

I am thinkking of getting a 100 T-shirt picture transfer press for this purpose, they should provide enough heat and pressure to get work done....or try UV option again...or try gardening instead.
New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by mattinker on January 25, 2021, 01:58:54 PM »
Hi Andrew,
I thought that bubbles would be unlikely as your atmosphere doesn't have anything like the hydrogen content that a gas fired foundry has. I've made a de-gasser, (based on "olfoundry man's" one using Argon)  that I've started a video on, I just need for the weather to get better so that I can get outside and do some more casting!

Nice to see the results of the Pistonium analysis.

Good news about the vaccination, my ex-mother in-law who is 96 can't get one in Seaford.

Cheers, Matthew
Project Logs / Re: Studio camera stand
« Last post by DaveS on January 25, 2021, 01:49:56 PM »
Having repaired these type of machines for 30 odd years or more Iv'e seen a lot of carnage from just broken tooling and fixtures to repairs going into thousands.
Probably 25% caused by not proving the program on a first off. All it needs is a misplaced dec point.  Yes the first one will take a bit longer but in the long run it can save time and money and a lot of aggro. Some engineering places might take a chance,  but for the small business or hobbyist it can devastating.

 My lathe and mill are both manual and I've dropped a clanger a few times, it's worse if you do it after spending a few hours and cock it up on the last operation! :bang: :doh: 
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