DinaSaw® T-Rex Automatic Chain SharpenerDinaSaw T Rex Automatic Chainsaw Chain Sharpener Made in Australia The DinaSaw T Rex is a fast, accurate automatic sharpener for chainsaw chains from 1 4 arborist up to 3 4 harvester. Minimal setup between chain types makes it ideal for bulk sharpening and workshop productivity. High throughput automation: grinds up to ~30 cutters per minute, indexes left and right cutters in a single pass, detects and sharpens non sequenced cutters, and can set depth