Surgical power tools are comprised of electric and pneumatic systems. The main advantages of pneumatic systems regard safety and cost considerations. Typical surgical requirements encompass spinal, cranial, ENT and orthopedic procedures. Machining capabilities include drilling, broaching, sawing, reaming and milling. Adverse artifacts may be introduced during bone machining procedures due to poor process control. This includes but is not limited to thermal bone necrosis. Process variability associated with pneumatic power tools stems from the distinctive torque-speed relationship. This investigation seeks to characterize the dynamic effects of pneumatic power tools on bone machining. Porcine fibulas are machined subject to varying process parameters. Experimental and modeling results are presented.