Janine and I bought a very old and well used bakery dough mixer back in 1978. This was a time when a lot of old, small, family run bakeries were being forced out of business by the big multinational food corporations, and a trend towards people buying mass produced bread in super markets, rather than going to the small family bakery.We didn’t have 3 phase power back in those days, so I adapted the dough mixer to run on the power from a 5HP petrol engine interfaced through a rather snazzy torque converter. The sort of thing that adapts automatic gear boxes to engines in cars. I was given it, so didn’t realise how expensive they were.
We used that dough mixer in conjunction with a 200 mm. Venco de-airing pug mill for 5 years to mix all our clay bodies. Tragically, That pottery burnt down in 1983. That was a timber building and was totally destroyed by the fire. What was really amazing, was that I was able to rebuild both the pug mill and the dough mixer from the melted and charred remains. I spent a lot of time working on that equipment to get it going again. Luckily this machine was housed in a corner of the building with 2 sets of glass double doors on the corner, so as to allow for good ventilation. As this part of the building had very little wood in it, the machine didn’t get too hot during the fire and none of the cast iron parts cracked.
The shaft of the dough mixer got rather bent during the fire, so had a very noticeable wobble in it when I got it going again, but at least I got it going. It was a bit of a mess, but I managed to keep it going for the next 36 years. After that fire, I converted it to a 3 hp single phase electric motor. The biggest motor that you can plug into a 15 amp power point, as that was all the power that we had at the time. It only just managed to do the job, as it wasn’t really powerfull enough, but I was carefull with it and nursed it along. I set it up with a home made, somewhat loose, slip-belt clutch as torque converters are so expensive.
After this last fire in 2019, The machine really got cooked, That’s it in the centre of the picture above, in the burnt out shed. Fortunately, the fire didn’t crack the castings. However, this time the main shaft was so badly bent, that it wouldn’t even rotate. I gave up on it, as I had so much to do to rebuild the new pottery shed that I couldn’t see myself ever really finding the time to fix it. Then, when my friend John Edye retired. I was able to buy his dough mixer. Very lucky timing. I didn’t have a pottery to put it in at the time, but bought it anyway, to make sure that I had it ready for when I could install it. As it happened, John also had loads of other jobs to do, so it sat there for several months, before we could find a mutual time that suited us both, for me to go and collect it.
In the interval, my friend Ross turned up one day, He is a really amazing person, who has so much knowledge and life experience with machinery. He saw me working on some of my ruined gear and asked what I planned for the dough mixer. I told him that I had given up on it for the time being, but couldn’t bring myself to abandon it. Ross had a good look at it and said that he thought that he could extract the main shaft from the gearbox and straighten it in his hydraulic press. He had done other jobs like that in the past. So I said “yes please, have a go at it”. I know that I won’t get around to it for a long time – if ever.
Luckily, I had poured spent engine oil all over most of the machines to stop them from rusting too much and greased all the bearings to prevent them from siezing up, so as to preserve them until I could find the time to get to them and try to fix them. I also bought a massive tarpolin to cover them. This turned out to be a smart move, as they remained there, under cover, for over a year. I found out through this experience that there is a massive amount of condensation under a plastic tarp, so all the machines that wern’t oiled were very badly rusted.
We worked on the dough mixer. Ross and I were able to dismantle all of the moving parts that still moved, and Ross took the main shaft home with him. He called a few weeks ago to say that it was now back in a good shape. Not perfect, but very good. We water-blasted the carcas to remove all the old oil, carbon, ash and burnt paint from it and I moved all the other bits inside, to keep them dry while I set about re-assembling the gearbox and all other moving parts. Ross organised a new oil seal and I had removed the main bearings and soaked it in oil to rinse clean and preserve them.
At this point, it’s looking a bit like a burnt out darlek!
A new 3 phase electric motor, a good clean, some rust converter and a coat of zinc primer and it starts to look as though it will go again.
The mixing bowl on the other hand had copped a bit of a hiding. It was split in 4 places around the rim and was no longer completely round, in fact it was a little bit heart shaped. I spent some time on it, a bit at a time, clamping it back in shape and tack welding it together, getting it as round as possible, then welding all the splits back solid again.
After a week of nights, doing all the usual things, rust converter, penetrol sealer, zinc primer, several top coats of hard gloss oil paint and its looking great.
Everything is coming together now. The housing, gearbox and mixing arm have been given their severel top coats and are looking good. I bought a new 3 phase motor, new drive belts and electricals, so when I plugged it in the first time, and it actually went – I was really moved that it was back from the dead. Again! Thanks to Ross!
Now I need a pug mill and we are back in business, ready to make clay again. This restored ‘phoenix like’ twice burnt, and twice restored dough mixer sits in the same room as John Edye’s mixer that I bought when I had absolutely no idea that mine might be recoverable. Hints of ‘two-sheds Jackson’ here. Steve ‘two-mixers’ Harrison.
Weirdly, my old ruined one is now ready to work before I have finally gotten around to finishing cleaning out and painting the bowl of John’s machine.
Rust converter being applied inside the bowl and the mixing arm to neutralise the rust, by converting the iron oxide that is very susceptible to oxidation with air when it gets wet, and converting the iron oxide to iron phosphate, which is quite stable and inhibits further rusting. However. The iron phosphate really needs to be sealed with a water impermeable membrane. In this case it also needs to be fairly impact and wear resistant. I have found that an oil based, high zinc, machinery paint works quite well. Well, similar stuff that I used in 1983, the first time that I restored this mixing bowl worked really well and lasted for 36 years! Of course, there is no guarantee that anything on sale today will last as long.
The bowl after rust conversion. I sent this image to John and we both agreed that the inside looked al to like an ancient ‘hare’s fur’ tenmoku glazed tea bowl.
Ready for the primer and top coat.
The first coat going on.
ready for work.