Board Thread:Questions and Answers/@comment-66.66.129.84-20130104024106/@comment-5885120-20130104050821

Much easier than bothering with sorting machines and painting pneumatic tubes is just to use chests and filters. Set the first filter to pull stacks of 63 iron at a time and pump them to a chest. From the second chest, have one filter send 42 iron to your sorting system and 21 iron to your furnace. Just make sure all three filters are on the same pulse (or a properly tiered pulse). This way the first filter will always pull enough for the second and third filter to split it into thirds.