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Owing to the current ongoing situation, the DTCA 2020 AGM which had been booked for the end of June, cannot now take place.   We will have to try and reschedule for later in the year once matters are clearer.

Production of the DTCA special edition Omnisport model has been postponed.

 

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dinkycollect's picture
dinkycollect
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DTCA MemberFrance
Joined: Fri, 06/26/2015 - 22:49

Dinky Toys manufacturing.

This post has been transfered from the thread "Matching pictures).

I believe I have shown this photo once before. I used it as a demonstration that possibly a more or less squarish model was a bit easier to cast, allowing for a seam of the vertical halves in the middle.

The models on top are square and show that seam. The models below have more round shapes, which took more die- elements to cast in my opinion. So possibly, if there was an opportunity to make a more square model, the casting would be easier - and cheaper no doubt. Just a theory ....

Kind regards,

Jan

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dinkycollect
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DTCA MemberFrance
Joined: Fri, 06/26/2015 - 22:49

This is the die for the Big Bedford chassis and cab. It shows how things work.

When designing a die, one must take in account the shape of the casting to be made and where to hide the seems or die partition lines. In the case of the Plymouth, the Daimler ambulance and others, the seem are clearly visible on the roof but it is hiden in the center line of the bonnet.

The die for these models with vertical rear have four sliding drawers. The Big Bedford has two only. On the picture above, you can see that these drawers are square, they have a very tight fit with the other parts ofthe die so that there is no flash in between.

Jan is right, the rear of the Plymouth has been made square because otherwise the mobile part of the die on which the rear hatch is machined would have had a curved top which is probably possible but extremely difficult to make.

I am sorry but it is difficult for me to explain all this in English and in writing. If you wish, I could explain this verbally during the next AGM.

Partition lines for 27f Estate car.

dinkycollect's picture
dinkycollect
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DTCA MemberFrance
Joined: Fri, 06/26/2015 - 22:49

Raised versus recessed door lines.

This discussion has started else where but I shall try to explain what I know about this subject.

Early Dinky Toys had raised door lines which do not comply with real vehicles. At that time (1933 - 1954) the moulds where cut by milling machines and these lines were easyer to do than recessed lines. The mould was first made smooth without lines, later the lines were ground.

                    
                                                   Electrode for the Solido Peugeot D4 van

Then comes the new technology of spark erosion. Instead of copying a large scale wooden or resin master a solid copper sample of the model was used as an electrode which was used to cut the mould. The door lines were cut into the electrode and of course the mould had the lines inverted which means raised. In turn the casting had inverted lines from the mould and the finished product had recessed lines. Raised details like door handles, bonnet emblem and the like were still milled into the mould.

You have not understood, never mind give me a call and I will explain further.

The first Dinky Toys with recessed lines is certainly the Austin Atlantic issued in 1951. The die for this model has probably been sub contracted as at that time Meccano almost certainly did not have a spark erosion facility.

The next model was the 24v Buick Roadmaster issued in January 1954. Bobigny did not make it's own moulds, they were all subcontracted to specialised companies who had up to date equipement. Next came the 24y Studebaker Commander issued fourteen months later in June 1955 and the 24x Simca Versailles in March 1956.

Liverpool issued their first two recessed lines cars in January 1961 seven years after the Buick Roadmaster. These were the 195 Jaguar 3,4 l  and the 185 Alfa Romeo Super Sprint but of course, this was a French casting. Next came the 186 Mercedes 220 SE, the 949 Wayne School bus in February 1961 followed by the 194 Bentley (which is not a coupe) in March 1961 and from then all the new models.

A caracteristic of these first English dinky, mainly the Jaguar and the Mercedes is their extremely light weight.

The seven year delay for introducing spark erosion in Binns Road may be partly due to the unions which at the time were reluctant to any new technology which of course used less labour. It is known that when the electrostatic painting line was installed, it took months before it was used thanks to the unions who discussed who would work on it, at which salary, with which bonus and all that fuss. No wander the company packed up.

 

Jan Oldenhuis's picture
Jan Oldenhuis
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DTCA MemberNetherlands
Joined: Thu, 07/30/2015 - 22:47

Jacques, thank you very much for your clear technical explanation. It is very valuable that you provide this technical explanation. It makes understanding the making of the model with its lines so much more valuable. I am very happy with this kind of information from you with explanations and images in the forum and hope to enjoy your contributions much more.

Kind regards, Jan Oldenhuis