First, just as a test if I succeed

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Edwin
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Re: First, just as a test if I succeed

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After I finished the casting of the upper part of the lower part of the form num.

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Could I also this casting. The cap in the middle of the filling opening for the zinc.

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After everything was nicely cured saw the moldings after separating from better.

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But before I finished making the mold and still build with the vents , I'm still the master casts made ​​from resin . So I have the hassle with the shape is no longer relevant and the silicone can without much preliminary work direckt giesen on the master plates . The silicone mold will not even live forever.

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The only drawback to this method is the rather large consumption of Resin, but it is still worthwhile if you need a new form .
Here you can see how pretty much the resin must be plate .

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The same course I did that with the second mold half , only that I 've placed a displacement in the middle to save Resin .

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zander
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Re: First, just as a test if I succeed

Příspěvek od zander »

Hi Edwin
Nice cake. :o It looks like a view into the kitchen. :lol: :lol:

Michal
"Rytířský v boji, bdělí v míru"
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Edwin
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Re: First, just as a test if I succeed

Příspěvek od Edwin »

Yes Zander,

only is the cake a very Tough and about the other one bites the teeth slightly from .... :mrgreen: :lol: :lol:

Cheers, Edwin
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Edwin
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Re: First, just as a test if I succeed

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Today I had again the time something to do here.

If I need now form a new centrifugal casting I can drain quickly with the Resin negative now.

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In the right form now still missing, the vent holes. The I install with a 1mm drill at all relevant points.

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Allow the air to escape during the casting and also the holes are not sealed by the pressure plate I milled with a cutting disc just still air channels through the holes.

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Now I can soon try out the new form.
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Edwin
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Re: First, just as a test if I succeed

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Today I finally tried my hand in rotational molding again .

First powdered forms .

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Here you can see the difference as beautiful as the powder adhered to the silicone.

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Place the brass tubes for the pin bearing into the mold.

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And close the mold and screw it into the skid pan .

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After I had melted enough zinc , I could pour it into the opening.

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The first pour but has become anything yet. The speed was too high and not pressed the mold enough to each other. As a part of the zinc is ejected from the From and only two of the six members are useful . I think the temperature of the zinc was too hot .

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So the same again and this . Sometimes with less temperature and lower speed This was but now back to low. The casting looks good, but the form is not completed and the parts so flawed .

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That will probably still be some work until it works to my satisfaction.
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Edwin
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Re: First, just as a test if I succeed

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After a few small changes it went today. I do but only piece by piece and so I first have installed a few vents .

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It has gotten better , but I see the need again to make a new form and I also do not know if I need a slightly harder silicone for this, as some slightly bent chain links come from the mold. On the second cast I had way too little material which is why two of the forms were not filled sufficiently . What I do not like is the surface of the chain. That was much better from the single form.

So now I have at least some members whose quality is just sufficient for use according to my understanding . Therefore, I have now started with the assembly of which is still a lot of work .

First, disconnect the small brass tubes with a band saw , as far as you can reach it .

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The pipe pieces that you can not cut so I have to cut out with a small blade.

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Then I can edit the links with a small belt sander .

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When connecting bolts I use 2mm spring steel. It is so stable that 150kg train at enem piece of chain had led to no deformation or tearing .

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And here , the combined length of chain . The slightly shorter is still the tensile test , but it can recognize the much better surface. The temperature of the mold makes the way, since no difference.
In the foreground is a small piece of 1/16 chain as a comparison.

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Edwin
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Re: First, just as a test if I succeed

Příspěvek od Edwin »

By the way I bring it to me, too just 3D CAD with and just created a caster in 3D for it to be able to create master.

It's times as one half of a roller in 1/6

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Edwin
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Re: First, just as a test if I succeed

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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 .

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I'll be there now try around a little and then build a new form of the current experience .
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Edwin
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Re: First, just as a test if I succeed

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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.

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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

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

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

[ mg] ttp://up.picr.de/17396627av.jpg[/img]

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 .

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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.

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Then I just have to cut the sprues and can use the form immediately.
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Edwin
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Re: First, just as a test if I succeed

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

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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 .

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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.

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

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

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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.

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

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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.
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