Thread Milling

A mold-making shop came to us struggling to machine deep threaded holes in hardened tool steel at HRC 62. They relied on a conventional tap, but the tool snapped deep inside a late-stage mold plate. That single broken tool scrapped an expensive, semi-finished workpiece, costing them thousands of dollars in lost labor and raw materials.

We once tackled a demanding project where a customer had to cut multiple internal thread sizes into mold steel. The run included both standard pre-hardened stock and much harder tool steel. They initially picked cutters based purely on thread diameter and nominal pitch. Once chips started flying, tool life collapsed on the harder blocks, chatter

A client recently brought us an urgent project requiring precision internal threads in heat-treated mold steel exceeding HRC60. Initial test parts passed inspection cleanly, but as production scaled, thread tolerances began drifting. Go/No-Go gauges bound inconsistently, minor burrs emerged along the crests, and cutting edges chipped prematurely. The client suspected poor tool quality, but a

A mold-making shop recently approached us with broken taps embedded in pre-hardened tooling blocks. Tapping seemed economical for the initial low-volume run, but rapid tool wear quickly caused rough surface finishes, torn pitches, and catastrophic tool failure. When a tap breaks inside an expensive cavity, EDM burning is often the only extraction method, inflating production

A client recently brought us a difficult threading job involving heat-treated SKD11 tool steel hardened to HRC62. Standard taps chipped and snapped almost immediately, while general-purpose carbide end mills suffered severe flank wear and left heavy chatter marks. In high-hardness machining, these failures stall production and quickly drive up scrap rates. When workpiece hardness exceeds