Jerome McHale explained in a post on Pojo that the reason this archetype name was localized to "Machina" from "Machiners" was that the former name "clearly demonstrates that these are Machine-Type monsters, not other types of monsters that do work on machines."
The core components of a"'Machina" Deck are "Machina Fortress", "Machina Gearframe" and "Machina Peacekeeper" because of their versatility in any Machine oriented Deck. "Machina Force" also has a place, but only because it is an easy fodder for the Summoning requirement of "Fortress" that can be easily searched by "Gearframe". A common loop in all "Machina" Deck variants is that "Gearframe" and "Peacekeeper" search for each other, always ensuring that there is a Machine-Type monster ready for the discard cost of "Fortress".
Basically, the main strategy is to Tribute Machine-Type monsters to Summon more powerful Machine-Type monsters. It's harder than it looks, but when it's done right, you can easily defeat your opponent. Using cards like "Time Machine" and "Dimensional Prison" to protect your monsters until you can combine them is one way to ensure victory. Using "Swords of Revealing Light" when you have all the monsters needed to Summon "Machina Force" also works. This gives you enough time to complete the process.
Another decent combo in the "Machina" archetype that you can use is to equip "Cyber Dragon" with "Armored Cybern". By keeping them in Defense Position you have a good defense and an even better offense. When you equip "Armored Cybern" to "Cyber Dragon" you can destroy a card by giving up 1000 ATK. You can also equip it to "Proto-Cyber Dragon" to do the exact same thing, but you can only do it once without an Equip Card to boost it's ATK. By using "Proto-Cyber Dragon" first and then upgrading it to "Cyber Dragon" you can easily keep your monsters safe until you can Summon "Machina Fortress" or "Machina Force". "Roll Out!" can be extremely helpful in this case (either by recycling the effect of "Armored Cybern" or providing more protection for your "Cyber Dragon").
Also, using "Future Fusion" to Summon "Chimeratech Overdragon" is a good way to send copies of "Machina Fortress" to the Graveyard. This can be timed along with the effect upon destruction of "Geartown" to Special Summon "Ancient Gear Gadjiltron Dragon". That's a good strategy to get your monsters to the Graveyard. It's not the best strategy, as "Chimeratech Overdragon" sends all other monsters you control to the Graveyard when Summoned this way, but it's still a powerful one and you can Summon the "Machina Fortress" once "Chimeratech Overdragon" is destroyed. This can also work with "The Last Warrior from Another Planet", though it is not a Machine-Type.
With nearly constant discard fodder of "Machina Fortress", numerous decent-ATK monsters, and a destruction-saving Union monster, this kind of Deck plays with relentless Beatdown and some field & hand control.
An alternate but more risky combo is to equip "Megamorph" to "Force", rather than activating "Limiter Removal" to double its ATK. Then, if no player had lost any Life Points up till now, pay 1000 Life Points to attack an opponent's Attack Position monster and activate "Limiter Removal" during damage calculation.