Building a small rock crusher or mill can be a rewarding DIY project if you’re handy with tools and materials. Below is a step-by-step guide to constructing a simple jaw crusher or impact mill for crushing small rocks into gravel or powder.
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Option 1: Simple Jaw Crusher (Manual)
A jaw crusher uses compressive force to break rocks between two plates.
# Materials Needed:
– Steel plates (hardened steel preferred)
– Heavy-duty bolts & nuts
– Angle iron or steel frame
– A flywheel or hand crank mechanism
– Welding machine (or strong bolts for assembly)
– Base structure (wood or metal)
# Steps:
1. Build the Frame:
– Construct a sturdy base using angle iron or thick wood.
– Weld or bolt two vertical steel plates to form the sides of the crusher.
2. Create the Jaw Plates:
– Cut two steel plates (one fixed, one movable) to act as crushing surfaces.
– The movable jaw should pivot on a hinge bolt at the top.
3. Add a Flywheel/Crank Mechanism:
– Attach a lever arm or hand crank to the movable jaw for manual operation.
– A weighted flywheel can help maintain crushing momentum.
4. Adjustable Discharge Gap:
– Use spacers or bolts to adjust how close the jaws come together, controlling output size.
5. Test & Operate:
– Place rocks in the top and manually crank the lever to crush them.
– Collect crushed material below.
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Option 2: DIY Impact Mill (Electric Motor-Powered)
An impact mill uses hammers or chains to smash rocks into smaller pieces at high speed.
# Materials Needed:
– Steel drum or pipe (for housing)
– Hammers, chains, or steel bars (for crushing)
– Electric motor (½ HP to 2 HP, ~1750 RPM)
– Shaft & bearings
– Pulleys & belts (if needed for speed adjustment)
– Metal screen/mesh (to control output size)
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# Steps:
1. Build the Crushing Chamber:
– Use a steel drum (~12″–18″ diameter) as the housing.
– Weld mounting points inside for hammers/chains.
2. Install Rotating Hammers/Chains:
– Attach hardened steel bars, chains, or hammer-like