First, just as a test if I succeed

I am still on the accumulation of experience , but as a little I get on.

Having trouble by default and surface in rotational molding I have by the shape and size of the chain links , but I learned a lot again, I 'm working around a bit on my last microframe form. Since I will build such a form anyway also my past experience again, I can I still edit these a little and see what happens and lo and behold ....

With the reworked form I was able to immediately resolve 90 % of the remaining problems. Delay and poor surface I had not at this silicone anyway. Just filling out the form I had not yet under control.

Now only two places that I also already have almost the handle is missing .







I'll be there now try around a little and then build a new form of the current experience .

Before I can build a new form with which I can implement my previous experience I will create a larger and more flexible molded frame.

This I 'm from 11.5 mm Alunminium
rods which I abfräse at the ends and in the middle , and thrust . So I can put together any bars like a log cabin .
Because the whole is built of nothing but remnants , it does not look professional, but serves its purpose. So I can now shapes in different sizes presses. The framework I have made ​​it so big that it still fits well in my small oven.



After the frame is ready , I can the new form, which is slightly larger than my old frame zulies .
Thus, the silicone not verklezt with the frame I Dress him first with baking paper . Since I do not need the whole form I use old silicone molds as filling klotz



So , I offer two silicon plates and press the Master in the silicone.



As Trennmttel I dove all a with talc and as a connector I use self- cast knobs .

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So I can then rebuild the shape of three parts in one whole ..

After all silicone is processed I 'm still a chunk of aluminum to press it and screw the cover plate of the mold .
This I will still be a few minutes and put the screws again somewhat, because the silicone deforms as a viscous mass .





I put the oven on the terrace , because the smell in enclosed spaces is not exactly edifying , and make the form now by 1.5 hours.



Then I just have to cut the sprues and can use the form immediately.

After the mold was allowed to cool overnight, unpacking was first time announced.



After I had the shape plastered around something . It has pushed the silicone into each hole . I had to separate the mold , which is not easy. But if you have found the beginning , it is no longer a problem .



The next step was to cut the sprues with a carving knife into the silicone. This works simply because it is quite stable and stiff.



After I had installed a couple of vent holes and the shape well dusted with talc , it went to the first casting.





But a little rework was required.
But now I have the alues ​​form come from the useful links and that I can use .



The rework is almost consuming than the preparation and casting itself so you have to grind a lot , including the little hand belt sander proven once again very good.



After cutting out the Messingröchen I could start the first chain links with a 2mm spring steel bolts to connect.





What I notice when casting to my surprise is that the cold mold works best. If this is too warm arise all of a sudden again cavities and the cast is not usable.

Now I 'm going to make these chain links two new master and from two new forms that will be even better. So then the production of the chains begin for the prototypes.

Thus , very slowly , there is next to a lot of other work here too progress .

Now I have the same time my new press frame fully utilized and created two forms in it.









And so I now have three forms for casting the tracks , which is still significantly speed things up .



So I started with the drive wheel . For this I must first find the perfect teeth and that I make from my experiences with pattern discs . The first I took over after a dimension of an original drawing and milled aluminum disc as such . On the side is for size comparison , the drive wheel of a tiger in 1 / 16th



And immediately encounter each theory and practice. An error of only 0.3 mm per tooth in the width and the toothing does not fit , although located in the Tolerance of the drawing.



I know however, to what extent I can not rely on these drawings and for what tracks ( 360mmm , or 400mm width) was thought the ring gear . There was quite small differences .
But as there is no great effort to mill a new disk and try until it fits snugly and can be applied to the Master of the drive wheel .

Slightly revised to correct the pitch and the intervention in the chain.



So I can now begin the drive to draw in 3D.

  bellissimi e interessanti i lavori di fusione  e rifinitura dei cingoli in metallo , tanto quanto la ruota dentata per il loro controllo prima del montaggio sul modello , un salutone e complimenti per la costanza dei lavori ......... robby62 e riky94 ........