The formula for determining how many uses a repaired item can have. However, look at the example, repair a stone tool. Once you have a workbench, forging and casting, you can create a carriage (wood x20, bronze nails x to carry all your heavy items. Dragging this heavy object across the various biomes on the map causes natural wear and tear, which can damage the tank.
I recommend using the hoe tool to create some roads first to minimize damage. That said, you can repair a car using the hammer (similar to construction tiles) as long as it is within the radius of your workbench. In Rust, all repairs are done through the repair bench item menu. Even before you try to repair a trusted axe you've used from the start, you'll need to find or create a new repair bank to get the process going.
Items such as the anvil can only repair other items so many times before their durability runs out. That is the most likely reason why you cannot repair your tool. Everything not listed below does not have a unit repair item and can only be repaired by consuming another instance of itself. Repair tools are items that can repair certain usable items in the game, such as weapons, clothing, and armor when their condition values are lower.
The repaired item is never spelled, even if both items have exactly the same enchantments, with the exception of curse enchantments, which are transferred to the repaired item. The durability of the repaired item is equal to the sum of the durability of the old items plus a “repair bonus” of 5% of the item's maximum uses, up to a limit of the maximum durability of that item. Item Repair is a feature that allows players to repair tools, armor or other damaged items with durability by combining them on the crafting grid or on a sharpening stone. Once you're in the repair bank, all you have to do is drag the item from your inventory into the repair slot and hit the “repair” button.
Since repair tools put them at a lower maximum durability, each subsequent repair has diminishing returns.