If you make you own compost, you can see grass mowings and soft young weeds, rot quickly. But small branches and woody prunings decay very slowly.
They need to be shreded to be correctly composted.
If the woody prunings are a small fraction of your compost maybe it is not necesary to buy a expensive compost shreder. You can build a small hand cranked compost shredder.
Step 1: Big bore bit drill
This is the core of the shreder.
A worn big bore bit drill . You need to weld a rod in the tip of the bit drill. this rod must be aligned with the bit drill's axle.The frame is made from wood. take all the measures and drill two holes in the frame, then put two bearings on it and put the axles into them. Fix the frame with nails or whatever you want.