A very interesting mod in the new FTB modpack is Tinker's Construct. I really enjoy the way to combine metals into an alloy and build tools with patterns. This video describes how to get started with all building blocks and how to craft a pickaxe from it. The next step in TC is to combine different materials to make a good tool and of course upgrade it. As said in the video; a good subject for another video :)
Update: I have made another video about this mod, about how to automate smelting: http://youtu.be/xcubbQfeiCY There is also a movie about different pickaxe designs: http://youtu.be/Y2_QowCdo_U Liquids can be put into tanks to make it easier: http://youtu.be/GIVc1dqsM_E
There is quite a number of different blocks to build, but luckily the recipes are easy and cheap. Basically only Sand, Gravel, Clay and Wood to get started. In this video I used: 7x Blank Patterns 1x Stencil Table 1x Part Crafter 1x Pattern Chest (optional but recommended) 1x Tool Station
And to the smeltery: 1x Smeltery Controller 1x Seared Glass 1x Smeltery Drain 1x Seared Tank 1x Seared Faucet 1x Casting Table 18x Seared Bricks
That should require 108 Seared Bricks and 6 Glass. This is 54 each of Sand, Gravel and Clay to make the Grout to smelt.
Normally you get the new books automatically when crafting the "trigger items". But I had done it before so I didn't get them in the video. Had to do it again because I had a recording issue the first time ;)
Update: The Ingot Cast has to be created at the Casting Table in the same way as the other casts. This was updated in the mod short after releasing the video.
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Music: "Dispersion Relation" "Airport Lounge" "Dub Feral" by Kevin MacLeod (incompetech.com)