Chop Saw, Drill Grinder, and other simple single input / single output machines. First argument is output, second is input, third is whether the recipe works in a machine with stone parts. To remove a recipe, specify the output.
mods.factorytech.ChopSaw.addRecipe(<minecraft:gold_nugget> * 9, <minecraft:gold_ingot>, true);
mods.factorytech.ChopSaw.removeRecipe(<minecraft:stick> * 3);
mods.factorytech.DrillGrinder.addRecipe(...);
mods.factorytech.MetalCutter.addRecipe(...);
mods.factorytech.Magnetizer.addRecipe(...);
mods.factorytech.ElectricFurnace.addRecipe(...);
mods.factorytech.Electroplater.addRecipe(...);
mods.factorytech.Grindstone.addRecipe(...);
Tempering Oven: (Output item, input item, time in ticks) to add; (output item) to remove.
mods.factorytech.Temperer.addRecipe(<minecraft:leather>, <minecraft:rotten_flesh>, 60);
mods.factorytech.Temperer.removeRecipe(<minecraft:leather>);
Centrifuge: First argument is input, second three are outputs, then whether the recipe works with stone parts.
mods.factorytech.Centrifuge.addRecipe(<minecraft:soul_sand>, <minecraft:blaze_powder>, <minecraft:sand.0>, <minecraft:coal.0>, false);
mods.factorytech.Centrifuge.removeRecipe(<minecraft:soul_sand>, <minecraft:blaze_powder>, <minecraft:sand.0>, <minecraft:coal.0>);
Compression Chamber: (Output item, input item, input fluid) to add; (output item) to remove.
mods.factorytech.CompressionChamber.addRecipe(<minecraft:bucket>, <minecraft:lava_bucket>, <liquid:lava> * 1000);
mods.factorytech.CompressionChamber.removeRecipe(<minecraft:lava_bucket>);
Crucible: (Output fluid, input item) to add; (output fluid) to remove.
mods.factorytech.Crucible.addRecipe(<liquid:sulphur> * 50, <minecraft:blaze_powder>);
mods.factorytech.Crucible.removeRecipe(<liquid:sulphur> * 50);
Refrigerator: Same as the Crucible but in reverse.
Agitator: (Input liquid 1, input liquid 2, Input item, output fluid, output item). (Output item, output fluid) to remove. All of these can be null except for the first input liquid.
mods.factorytech.Agitator.addRecipe(<liquid:water> * 1000, <liquid:lava> * 1000, <minecraft:dirt>, null, <minecraft:iron_ore>);
River Grate: CraftTweaker can be used to add or remove possible outputs. The syntax is (item, chance) with 0 being never and 1 being always.
mods.factorytech.rivergrate.addRecipe(<minecraft:sand>, 0.1);
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