Within Tolerance Episode 240 - Roast My Shop with Justin Gray
Justin Gray from Toolpath spent a week at ProDM machining shop as an intern, providing detailed feedback on shop operations and workflow:
- [safety] Power strips on shop floor covered in metal chips pose fire hazard - need immediate mounting under desks
- [efficiency] Manual probing and scribing operations could be streamlined with 3D-printed scribing dividers and better zero point usage
- [maintenance] Kinked outfeed hose on coolant filtration system needs replacement after months of reduced performance
This episode features Justin Gray, founder of Toolpath AI, spending a week as an intern at Dylan's ProDM machining shop in Arizona. The visit served dual purposes: giving Justin hands-on experience to inform Toolpath development, and providing Dylan with fresh eyes on his shop operations.
Justin compiled a detailed list of shop improvements, ranging from critical safety issues to efficiency optimizations. The most urgent was power strips sitting on the floor covered in metal chips - a fire hazard requiring immediate attention. Other significant items included replacing a kinked coolant filtration hose that's been problematic for months, implementing better organization systems for programming workbenches, and automating the Z-probe calibration process on their Hermle 5-axis machine through custom macros.
The technical discussions revealed surprising insights about machining fundamentals. Justin discovered that most tool manufacturers base their feeds and speeds on simple percentages of tool diameter - a relationship that neither he nor Dylan had previously recognized despite years of experience. This revelation is informing Toolpath's approach to automated programming. They also explored the dramatic difference in rigidity requirements between 3-axis vise work and 5-axis operations, where parts are often cantilevered and much more prone to vibration issues.
Regarding Toolpath development, Justin provided updates on recent improvements since IMTS, including better toolpath exports to Fusion 360, automatic chamfer tool tip offset calculations, and integration of the superior Parasolid CAD kernel (replacing OpenCascade). The major upcoming feature is 3-plus-2 machining capability, planned for 2025, though work holding integration remains the primary technical challenge. Justin emphasized that Toolpath aims to be 90% automated while allowing user control over the final 10% - letting machinists tell the AI how to program rather than the AI dictating the approach.
The conversation also covered broader industry observations, with Justin noting how outdated CNC control interfaces feel compared to modern software, and his surprise at how welcoming the machinist community has been compared to stereotypes about secretive, crusty operators.