Lathe Universal Runner

Bergeon 1766-31Contains:

• Centring plate, with tapered holes from 0.15 to 1.40mm and 8 points from 0.15 to 0.50mm
• Double centring runner
• Centring run for countersinking
• Drillstock runner for Ø1mm drills
• Drillstock runner for Ø1.5mm drills
• Clamping key

The universal runner is used for fitting clock and watch pivots, a skilled worker can fit pivots measuring as little as 0.15mm.Two operations are generally used for this work:

• 1. Choose a drill that fits easily into the selected hole of centring plate
• 2. Mark the centre with the centring runner, then drill with a bit that is smaller than the hole selected, in either case, lubricate generously
• The countersink stakes must be ground accurately on the centre with an Arkansas stone