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I welded a couple of straps onto the lid body for reinforcement
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The hinge works well – I was worried it would flex – it didn’t
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The mould box and my overflow angle iron mould.
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The mould box and my overflow angle iron mould.
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Cleaning up the outside of the cast coupling.
Well today was the first time for many reasons I have been able to do some real metal work! I decided that I would fire up the furnace and melt and mould the coupling between the wiper motor and the milling table screw. I decided that instead of trying to make all the patterns in one go I would just make the coupling.
I find the process quite physical so before the melt I completed the welding of the lid to save me lifting it and raised the level of the pattern moulding at sitting level as well as the pouring. This did reduce the effort required so I will be making up permanent benches to fit onto the portable work benches I have. One will be made of metal (possibly aluminium tread-plate) and the second mdf with a border. However back to today, after using the Plumbago (which was a little more granular than I anticipated) then the pattern was placed in one half of the wood cope.
Once the part was removed (which went much better than with talc powder) the two halves were put together and placed onto a metal surface for the pouring process. The furnace was then started up and the casting completed (more detail will be added to the main website ). After a hour or so the metal was removed and I was pleased with the results.
There were several things I did different this time including using a stainless steel container as a crucible in addition to proper parting powders. However it was very nice to get back to metal! Overall a good session.
The next session will concentrate on completing the power feed. I hope to produce plans of all the power feed design and if anyone would like a coupling casting then please email me.
About Mike Freeman
Hello, my name is Mike Freeman and I am a retired Chief Fire Officer from the United Kingdom with a keen interest in model engineering, silver caddy spoons and sea fishing. I live in the pretty fishing port of Brixham, South Devon, in the United Kingdom.
I am a sufferer of degenerative osteoarthritis, which impacts on the amount of time I can spend in the workshop, and is the reason why you will see seats and a stool in some of the photo's. I have only recently added the above sentence after a discussion with one of my Doctor's from the excellent pain clinic, based in Torbay. This does affect concentration one of the reasons why I double then re-double my measurements and set ups.
Before completing nearly 30 years of public service I and my wife Sandy, owned and ran, a small restaurant in Okehampton Devon. Prior to marriage I worked for my father in his various businesses, in the early days these were garages, which he bought in a run down state, then built them up before moving on, to start again.
I took every opportunity in those early days, to work in his workshop's
learning 'on the job' rather than as an apprentice. This, I suspect, is the reason why my building various model's in the early days, turned into model engineering, when funds allowed the required equipment to be bought.
My workshop comprises one half of a detached double garage. It has a
stud wall separating the two halves and unusually perhaps, its own
shower/toilet/washbasin compartment! (the true reason for buying the
bungalow - don't tell the wife!!!)
It is fully insulated with a ceiling and fluorescent lighting supplementing the one window. Several double electrical sockets are dotted around in
relevant positions.
Equipment consists of 2 lathes (1 Myford ML 10 and 1 Chinese variable
speed motor with etched glass DRO's), 1 milling machine (RF25 far East) floor standing pillar drill, Proxxon bandsaw, Warco bandsaw, 6" wire brush and polishing mop motor, 6" coarse and fine grinder, Proxxon mini drill, various benches and an engineers vice. I have just acquired a third lathe, a Myford ML7 which I am at present evaluating so I can decide which of the Myford's I will keep.
I have only just bought the Chinese lathe and had it fitted with DRO's prior to delivery. And what a bonus they are! So good in fact that I decided to buy another set for the Milling machine. Whilst my engineering experience can only be described as limited, I find the use of DRO's has affected my accuracy levels which have improved tremendously (although that's not saying much!) and would recommend their fitting to any model engineer.
Prior to retirement I built for my son's 17th birthday a Locost car. This
was a tremendous project and a great feeling when it passed its test. The book it was based on suggests it can be built for £250. Ours was nothing special in the sense of all new parts but still cost about £900 to build!
I googled plumbago and it sais “Plumbago is a tender perennial that has lovely flowers of blue”. I’m guessing it’s not that.
Another google search says it’s the same as graphite which sounds just the right thing for parting. That just raises the question of where do you get it.
I found these suppliers
http://www.cfsnet.co.uk/acatalog/Graphite_Powder.html
http://www.greatart.co.uk/CRETACOLOR%20GRAPHITE%20POWDER-drawing-accessories.htm
Where did you get yours?