Great video and good to see another Australasian showing the world we have good ideas down here. You Kiwis are even better at it than we Aussies. The silicone oven gloves are a brilliant idea. If you're using HDPE or LDPE you need temperatures of around 250°+ C make it fluid enough to work. I'm gonna try for some with fingers though.
Very interesting. When you're adding the molten plastic to the mold, 7:16 the difficult part, what prevents air voids from collecting between the subsequent blobs of molten plastic getting stuffed into the mold? Perhaps you might like to cross section your sample billets to see how solid they turned out? Not being critical, just a curious follower.
Thanks for your questions. Yes, it is hard to eliminate air pockets when putting the molten plastic into the mold. My home made vise can apply a lot of pressure so I think I have got the air out, or at least compressed it enough until the plastic hardened. I will look at cutting some of the samples length ways to see what the inside is like. Another person at the woodturners club has made larger diameter samples, but these did not turn out well. He only had a F clamp to do the clamping and I think that is not enough pressure to get rid of the air. We cut some of his samples length ways and there were a few air pockets on the inside.
Thanks for showing another facet of home engineering that i would never of thought of, although I have herd of making material for practice machining by dissolving as much polythene as possible in molten candle wax. the examples that I have seen were made by gently melting the candle wax and then adding polythene film as in used disposable shopping bags or similar. when the molten wax is saturated with the polythene and then cooled, it is ideal for test pieces for machining novices to learn with without using expensive stock material.
Yes, that could work. I think I wound up the pressure too much when cooling on the coloured blank, and that is why it was tight. I will use less pressure when I do the next test.
Yes, it would be easier to remove with a split mold. I think the issue for the coloured blank is that I wound the pressure up quite a lot when it was cooling. I guess that put a lot more pressure on the wall of the mold when the blank was cold, and that made it hard to get out. The first one did not have so much pressure when cooling and it practically fell out of the mold.
to make flat sheets 6:00 add coins in 4 corners to get a tickness then weight the lid down it spreads to it sinks to the coin levels
That is a great tip, thank you.
Great video and good to see another Australasian showing the world we have good ideas down here. You Kiwis are even better at it than we Aussies.
The silicone oven gloves are a brilliant idea. If you're using HDPE or LDPE you need temperatures of around 250°+ C make it fluid enough to work. I'm gonna try for some with fingers though.
Thanks for watching. I have ordered some gloves (with fingers) which should be here any day now. I will then make some more blanks.
That's a good idea. Playing around with plastic waste to create someting. It opens possibilities...
Thanks Michel.
Very interesting. When you're adding the molten plastic to the mold, 7:16 the difficult part, what prevents air voids from collecting between the subsequent blobs of molten plastic getting stuffed into the mold?
Perhaps you might like to cross section your sample billets to see how solid they turned out? Not being critical, just a curious follower.
Thanks for your questions. Yes, it is hard to eliminate air pockets when putting the molten plastic into the mold. My home made vise can apply a lot of pressure so I think I have got the air out, or at least compressed it enough until the plastic hardened. I will look at cutting some of the samples length ways to see what the inside is like.
Another person at the woodturners club has made larger diameter samples, but these did not turn out well. He only had a F clamp to do the clamping and I think that is not enough pressure to get rid of the air. We cut some of his samples length ways and there were a few air pockets on the inside.
Thanks for showing another facet of home engineering that i would never of thought of, although I have herd of making material for practice machining by dissolving as much polythene as possible in molten candle wax. the examples that I have seen were made by gently melting the candle wax and then adding polythene film as in used disposable shopping bags or similar. when the molten wax is saturated with the polythene and then cooled, it is ideal for test pieces for machining novices to learn with without using expensive stock material.
Thanks for the info. That is an interesting method to make blanks.
I've wanted to try this for a while. Still looking for a suitable project!
Regards, Preso
Thanks Mark. Something will come up one day when you need to use or turn plastic..
That's an interesting concept, which I have stored in my memory bank, we go through so much bottled water here that I have plenty of resources. 👍
Thanks for watching. It is a good option if you need to make something from plastic.
That is pretty neat
Maybe a release agent on the mould will help. Tool surface lube like GlideCote.
Thanks for sharing
Cheers
Yes, that could work. I think I wound up the pressure too much when cooling on the coloured blank, and that is why it was tight. I will use less pressure when I do the next test.
As always a very interesting and informative video. I always enjoy your videos.
Thank you very much, I'm glad you enjoy them.
Nice work
Thank you.
Gday, that worked really well, thanks for sharing mate
No problem. Thanks for watching.
Perhaps a split mold would be easier for removal?
Yes, it would be easier to remove with a split mold. I think the issue for the coloured blank is that I wound the pressure up quite a lot when it was cooling. I guess that put a lot more pressure on the wall of the mold when the blank was cold, and that made it hard to get out. The first one did not have so much pressure when cooling and it practically fell out of the mold.
Beaut!
Thanks for watching.
Might be bitter off with a mould for your pin blanks, bro.
Thanks for watching.
Hi
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