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I don't really know if I should be posting this here, but I am looking to a diy solution to problem.
I'm just back from Japan, and while there got some poster books containing my favourite anime characters. I'd really like to preserve them, but they're just little A4 posters, and far from frame-worthy.
What might be the best way to go about keeping them preserved, but still able to be displayed?
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I want to build my own house from concrete. Of course, not just concrete, but also with thick layer of thermal insulation. Here is why: I live in industrial region of Russia called Urals and crushed granite (well, gabbro actually) and artifical granite sand are by-product of ore enrichment and are very cheap, major cement manufacturer has a plant just in 50km from this town. As a result, DIY b20-class concrete costs about $30 per cubic meter (e.g. 1.3yd^2) to manufature, which is about 1/3 to 1/4 of commercial concrete price (this is fucking russia: everyone expect their business to have 300% ROI not less) or 1/5 to 1/8 of brick&mortar wall. Also, unlike commercial concrete which has to be poured in 3-4 hours since mixing, own-made concrete gives flexibility of making&pouring smaller batches as needed. Also different additives could be added to enhance various characteristics.
Problem is, gravitational mixers are slow and give crap quality concrete, and do not work well at all with low water-cement ratio mixes.
So I want to build own concrete mixer to do 200 liter batches (cement bags here contain 50kg, basicly you need 250-300kg of CEM I 42.5 cement per cubic meter of mix to get decent class concrete).
Basicly, there are three forced mixers designs that produce good quality concrete:
1. two counter rotating horizontal shafts
2. vertical shafts with planetary driven paddles
3. turbulent mixer
design 2 has complex mechanical parts which break often, mixes very well
design 3 basicly is rather high standing tube with somewhat small impeller in the bottom, it runs at 200-600 rpm creating vortex, excellent mixing quality, also could be pressurised to make foam concrete, but needs powerfull motor (10kW) and belt drive that burns and breaks.
So, I choose dual horizontal shafts design.
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/diy/ I really need your help please. I want to start constructing a Hidden Blade, from Assassin's Creed. Specifically, a Dual Action Out The Front mechanism type, not gravity or spring-sprung. i understand the concept fair enough, i only have two issues
>I do not want to incorporate the pulley system as seen with most of these designs on youtube
>I want it out of metal (not wood or plastic) not as a weapon, but merely for quality of a better prop, an personal taste.
I wanted to maybe somewhat use the drawer slides from other designs and merge them with the DAOTF design. Any suggestions and advice? or Links to the best tutorial of a hidden blade you've seen/made?