Hey there! As a fellow purchasing manager dealing with those wild lead time swings for critical automation components, I totally get your struggle. When lead times can jump from 2 weeks to 6 months without warning, finding that sweet spot between JIT efficiency and safety stock protection is like walking a tightrope.

Based on current supply chain research, the optimal approach is a hybrid strategy that combines JIT principles with intelligent buffer stock. Here's what works best:

1. Segment your components - Use ABC analysis to identify your most critical automation parts (the ones that would halt production if unavailable). These get higher safety stock levels.

2. Dynamic safety stock calculation - For critical components, calculate safety stock using: (Maximum Daily Usage × Maximum Lead Time) - (Average Daily Usage × Average Lead Time). With your 2-week to 6-month swings, this formula helps absorb the volatility.

3. Supplier diversification - Don't put all your eggs in one basket. Having multiple suppliers for critical components reduces risk when lead times balloon unexpectedly.

4. Real-time monitoring - Use inventory management systems that track lead time variability and adjust safety stock levels automatically as conditions change.

The key insight from recent supply chain studies is that pure JIT is too risky in today's volatile environment, but carrying excessive safety stock kills your cash flow. The sweet spot is carrying strategic buffer stock for your most critical 20% of components while maintaining JIT for less critical items. This hybrid approach gives you protection where you need it most without overburdening your inventory costs.

What specific automation components are giving you the most headaches? I might have some targeted suggestions based on what you're dealing with!