What is the Connect Tool in Scrap Mechanic?
The Connect Tool creates physical joints between parts — blocks, Bearings, Engines, Wheels, and Seats. Connected assemblies move as one; unconnected parts fall apart when lifted or driven.
Scrap Mechanic Building Guide
Scrap Mechanic building guide: Connect Tool joints, bearings, engines, wheels, suspension tuning, first-car blueprints, and logic basics for Survival vehicles.
Step-by-step vehicle build — Connect Tool, bearings, engine, wheels, and getting your first car on the road.
~10 min read
At A Glance
Scrap Mechanic building is physics-first: 400+ interactive parts snap together, but only connections made with the Connect Tool survive a bumpy road or a Farmbot raid. Bearings spin, Gas Engines and Electric Engines deliver torque, Wheels and Suspension decide whether your first car launches into a tree or drives to the warehouse.
This Scrap Mechanic building guide walks through the Connect Tool workflow, rotating Bearings, engine and wheel pairing, suspension tuning, a step-by-step first car blueprint, and logic basics for doors and farm automation. Pair with the crafting guide for recipes, controls for build-mode keys, and logic guide for advanced gates. Verified July 27, 2026 · Axolot Games · Steam app 387990.
| Part category | Role | Unlock path |
|---|---|---|
| Links blocks, bearings, engines, wheels | Crash starter kit | |
| Rotating joint for wheels and mechanisms | Early Craft Bot | |
| Primary vehicle power in Survival | Mechanic Station tier 2+ | |
| Wheel (small/large/off-road) | Traction and steering surface | Craft Bot + loot |
| Absorbs bumps; lowers flip risk | Mid-tier Craft Bot | |
| Automation and vehicle logic | logic guide |
How does the Connect Tool work?
Every Scrap Mechanic building project lives or dies on connections. The (equip from toolbar) creates physical joints between compatible attachment points — block to block, to , Wheel to bearing, to frame. Without connections, the raises a pile of loose parts that collapse the moment you hit the throttle.
Right-click an attachment node, drag to a second node, and release when the preview line turns valid. Connected parts share stress: a heavy engine on a single wood block flexes and breaks; spread load across metal frames from the crafting guide. Use the Connect Tool in build mode (toggle via controls) so you can link parts without picking up the whole vehicle.
- Do01Enter build mode before linking heavy parts
- Do02Connect bearings to frame, wheels to bearings
- Do03Mirror left/right connections on cars
- Do04Test lift the whole assembly before driving
Connection rules that prevent wobble
Connect Bearings to the chassis first, then mount Wheels on the bearing's rotating face. Engines connect to bearings or dedicated engine mounts — never float an engine with only lift-tool friction holding it in place.
Symmetry matters for cars: if the left rear wheel connects through two wood blocks and the right rear uses one, the physics engine loads unevenly and the car pulls sideways. Mirror your frame before adding the Driver Seat.
Disconnecting and repairing
Hold the Connect Tool on an existing joint to break the link without deleting the part. After Farmbot raids or warehouse crashes, repair broken connections before replacing entire blocks — half of "my car fell apart" reports are one missing bearing link.
The Hammer removes blocks; the Lift Tool moves connected assemblies. Practice lifting your whole first car onto a flatbed trailer — that skill transfers directly to farming guide harvest loops.
How do bearings and the Lift Tool work?
Bearings are the rotating joints that make Scrap Mechanic building more than static forts. A connected to your frame spins anything attached to its top — Wheels, heads, harvester arms, or rotating turret platforms. and Electric Engines apply torque *through* bearings; wheel bearings should spin freely unless you intentionally build a tank tread.
The pairs with bearings for construction: raise a car body, slide underneath, lower onto wheels. and Springs extend the same connection system for harvesters, gates, and raid traps documented in the logic guide.
Bearing orientation
Bearing rotation axis depends on placement. For standard cars, bearings should spin around the horizontal axle (left-right). A bearing mounted vertically turns your wheel like a steering propeller — fun in Creative, useless on the road to the Packing Station.
Use the rotate keys in build mode (see controls) before connecting. One wrong bearing costs less to fix at the crash site than halfway to a warehouse guide POI.
When to add a second bearing row
Long trucks and harvesters need bearings at both ends of an axle. Mid-span wheels on a flexible wood beam wobble off on bumps. Metal Block frames with a bearing every two meters survive Survival roads far longer than minimalist race frames copied from Workshop speedruns.
How do I pair engines and wheels?
Scrap Mechanic building vehicles need three things: torque from an Engine, grip from Wheels, and control from a Driver Seat wired through connections. Gas Engines consume fuel canisters — craft them at the Craft Bot and keep spares in a seat-mounted storage. Electric Engines suit logic contraptions and indoor bases; most overland cars still run on gas for range.
Wheel choice changes everything. Small wheels turn fast on flat roads. Large wheels climb rocks on the map. Off-road wheels trade top speed for traction in fields — ideal for farming guide harvest runs. Always match wheel size left to right; mixed diameters make the physics engine fight itself.
| Wheel type | Best terrain | Tradeoff |
|---|---|---|
| Small wheel | Flat roads, base interiors | Low clearance; stuck on rocks |
| Large wheel | Hills, warehouse approach | Slower acceleration |
| Off-road wheel | Farm soil, forest floor | Lower top speed on pavement |
Engine power vs weight
A Level 1 Gas Engine on a ten-block metal truck may not move. Add a second engine, lighten the frame with wood where armor is not needed, or upgrade engine tier at the Mechanic Station before blaming "bad physics."
Bind throttle in the Driver Seat UI: forward on both engines for 4WD, or front-only for steering-lite carts. Controllers (logic part, not gamepad) can switch engines for hybrid farm rigs — covered in logic basics below.
Wheel and bearing stack
Standard stack: Frame block → Bearing → Wheel. Some builders insert a Suspension between bearing and wheel for smoother rides. Off-road Pineapple farm trails need suspension or you flip when a root clip launches the front axle.
Steering in vanilla Survival uses differential power or separate steering bearings — advanced builds export to the mods Workshop for Ackermann setups. Your first car should drive straight; steering polish comes after you reach the first Mechanic Station upgrade.
How do I add suspension and stop flipping?
Suspension parts are the difference between a Scrap Mechanic building meme and a daily driver. Suspension blocks compress on impacts, keeping Wheels on the ground and lowering flip torque when you hit a rock at full throttle. Skipping suspension on a tall narrow car is how you learn that raid value is not the only thing that kills runs — kinetic energy does too.
Anti-flip basics
Keep center of mass low: mount Gas Engines and storage near the chassis floor, not on a roof rack. Widen wheelbase — track width beats wheel diameter for stability on the drive to farmbots raid sites.
If the car wheelies, move weight forward or reduce engine throttle cap in the seat settings. If it face-plants downhill, add rear Suspension travel or engine brake logic.
Suspension tuning for farm and warehouse runs
Farm harvesters benefit from soft suspension on all four corners so soil bumps do not launch crops off a trailer. Warehouse speedruns favor stiffer suspension and large wheels to absorb less time per bump — choose based on route from the walkthrough.
Test suspension on the same hill near your Mechanic Station before a long trip. One minute of crash testing saves a twenty-minute walk back for fuel and wheels.
How do I build my first car step by step?
Your first Scrap Mechanic building milestone is a drivable car from crash-site scrap to the nearest Mechanic Station. You need roughly: a flat Block frame (wood is fine), four , four Wheels, one , one , fuel, and the . Craft missing parts at the Craft Bot using recipes from the crafting guide.
- Do01Build flat frame; mount Driver Seat centered
- Do02Connect Gas Engine; load fuel; bind throttle
- Do03Four bearings + four wheels; verify ground contact
- Do04Test flat → hill → add Suspension if flipping
- Do05Save blueprint in Logbook after first successful trip
Step 1 — Frame and seat
Place a rectangular frame 3×5 blocks (or similar). Mount the Driver Seat one block above the deck, centered, facing forward. Connect seat to frame with the Connect Tool. This is your command point — everything else attaches around it.
Step 2 — Engine and fuel
Mount a Gas Engine behind the seat, low on the frame. Connect engine → frame and engine → bearing path you'll add for the rear axle. Insert a Fuel Tank or carry canisters in seat storage; bind throttle forward in the seat UI and confirm the engine spins when you press W (keyboard defaults in controls).
Step 3 — Axles, bearings, wheels
Add outrigger blocks left and right. On each corner, place a Bearing with horizontal rotation axis. Connect bearing to frame, Wheel to bearing. All four wheels should touch ground evenly — use Lift Tool to nudge the frame height before final connections.
Step 4 — Test and upgrade
Drive on flat ground first, then the nearest hill. If the car flips, add Suspension or widen the frame before adding a second engine. Once stable, drive to the Mechanic Station for tier upgrades and blueprint save via the Logbook.
Next projects: a two-seat co-op car, a farm trailer for farming guide crates, or a spud-gun platform for night raids. Each reuses the same Connect → Bearing → Wheel stack from this blueprint.
Wire logic into your base next
Matched by build plan, shared topics, and guide progression — not random related links.
When should I add logic to my builds?
Scrap Mechanic building scales into automation when you add Logic Gates, Controllers, Buttons, Sensors, and Timers. You do not need a computer-science degree — start with a Button wired to a Gate that opens a Piston door, then copy the same pattern for farm water valves and raid traps in the full logic guide.
| Logic part | Survival use | Pairs with |
|---|---|---|
| Button / Switch | Manual doors, engine start | Piston, Gate |
| Sensor | Raid alarm, auto lights | Spotlight, Spud Gun trigger |
| Timer | Crop watering schedule | Water Cannon, Controller |
| Logic Gate (AND/OR) | Combine conditions | Sensor + Timer |
| Controller | Multi-step sequences | Warehouse doors, elevators |
Logic parts every builder should craft
Logic Gate — AND / OR / NOT modes combine signals. Example: Sensor detects Farmbot AND night timer active → turn on spotlight.
Controller — Routes multiple inputs to outputs; essential for sequenced warehouse doors.
Sensor — Triggers when a player, robot, or object enters range. Mount on farm fence posts for raid alarms.
Timer — Delays or repeats signals. Pair with Water Cannon for timed crop irrigation from the farming guide.
Three starter projects
Auto door: Button → NOT gate → Piston. Press to open, release to close. Upgrade to Sensor for hands-free garage entry when your first car approaches.
Engine kill switch: Driver Seat logic output → Gas Engine off when seat empty. Prevents runaway cars when you bail during a Haybot chase.
Raid light: Sensor (Farmbot tag) → OR gate → Spotlight + Sound. Cheap warning before Tapebots reach your Broccoli cell.
When to read the full logic guide
Move to logic guide when you build multi-gate controllers, elevator sequencers, or automated warehouse guide airlocks. Challenge Mode puzzles in Creative also teach logic without Survival resource cost — good practice before spending metal on a live base.
Scrap Mechanic building FAQ
Why does my Scrap Mechanic car flip or wobble?
Usually high center of mass, missing Suspension, mismatched Wheels, or uneven Bearing connections. Lower the Gas Engine, widen the wheelbase, and verify all four corners connect identically.
Gas Engine vs Electric Engine?
Gas Engines power most Survival vehicles with fuel canisters. Electric Engines suit compact logic builds and bases. Overland trips still favor gas for range.
How do I build my first car in Scrap Mechanic?
Frame → Driver Seat → Gas Engine + fuel → four Bearings + Wheels → Connect Tool every joint → test on flat ground → add Suspension before long trips. See the step-by-step section above.
Do I need logic parts for a basic car?
No — a first car only needs mechanical connections. Add Logic Gates and Sensors when you automate farm doors, raid lights, or warehouse airlocks.
Can I import Workshop builds into Survival?
Workshop blueprints paste in Creative freely. Survival requires crafted parts matching the blueprint — check mods and crafting guide before importing mega-builds.
Related pages
Matched by build plan, shared topics, and guide progression — not random related links.