add sawdust and tree/wood grindings with arcacia tree for dye and provide a better alternative rubbertree->latex path that yields the same as the tree tap, but requires more machine work

yet without textures

technic/machines/register/grindings.lua

@@ -0,0 +1,64 @@
+local S = technic.getter
+local moretrees = minetest.get_modpath("moretrees")
+local mesecons_materials = minetest.get_modpath("mesecons_materials")
+local dye = minetest.get_modpath("dye")
+
+-- sawdust, the finest wood/tree grinding
+local sawdust = "technic:sawdust"
+minetest.register_craftitem(sawdust, {
+	description = S("Sawdust"),
+	inventory_image = "technic_sawdust.png",
+	on_place_on_ground = minetest.craftitem_place_item,
+})
+minetest.register_craft({ type = "fuel", recipe = sawdust, burntime = 6 })
+technic.register_compressor_recipe({ input = {sawdust .. " 4"}, output = "default:wood" })
+
+-- tree/wood grindings
+local function register_tree_grinding(name, tree, wood, extract, grinding_color)
+	local lname = string.lower(name)
+	lname = string.gsub(lname, ' ', '_')
+	local grindings_name = "technic:"..lname.."_grindings"
+	local inventory_image = "technic_"..lname.."_grindings.png"
+	if grinding_color then
+		inventory_image = inventory_image .. "^[colorize:" .. grinding_color
+	end
+	minetest.register_craftitem(grindings_name, {
+		description = S("%s Grinding"):format(S(name)),
+		inventory_image = inventory_image,
+		on_place_on_ground = minetest.craftitem_place_item,
+	})
+	minetest.register_craft({
+		type = "fuel",
+		recipe = grindings_name,
+		burntime = 8,
+	})
+	technic.register_grinder_recipe({ input = { tree }, output = grindings_name .. " 4" })
+	technic.register_grinder_recipe({ input = { grindings_name }, output = sawdust .. " 4" })
+	if wood then
+		technic.register_grinder_recipe({ input = { wood }, output = grindings_name })
+	end
+	if extract then
+		technic.register_extractor_recipe({ input = { grindings_name .. " 4" }, output = extract})
+		technic.register_separating_recipe({
+			input = { grindings_name .. " 4" },
+			output = { sawdust .. " 4", extract }
+		})
+	end
+end
+
+local rubber_tree_planks = moretrees and "moretrees:rubber_tree_planks"
+local default_extract = dye and "dye:brown 2"
+
+local grinding_recipes = {
+	{"Common Tree",	"group:tree",	 			"group:wood",		default_extract },
+	{"Rubber Tree",	"moretrees:rubber_tree_trunk",  	rubber_tree_planks, 	"technic:raw_latex"}
+}
+
+for _, data in pairs(grinding_recipes) do
+	register_tree_grinding(unpack(data))
+end
+
+if moretrees and dye then
+	-- https://en.wikipedia.org/wiki/Catechu ancient brown dye from the wood of acacia trees
+	register_tree_grinding("Acacia", "moretrees:acacia_trunk", "moretrees:acacia_planks", "dye:brown 8")
+end