Model Boats Blog

Today saw another visit to the workshop and I continued with the task of making the 8 cast iron cylinder liners needed for the pair of Edgar T Westbury's 15cc 4 cylinder petrol engines I am building. Now real problems were encountered and the finished sizes all came within the 1 thou (0.001") tolerance I set myself. The methodology of halving the last few cuts really does make a difference i.e. if there is 0.012" left then the next cut is 0.006, followed by 0.003 etc. Since following this rule and with the digital readouts help I can hit finish sizes  required.

The photo's below show the cylinder liners made. On one I have forgotten to make the chamfer at the bottom of the cylinder so will need to make a collet to hold the liner when I re chuck the liner to cut the chamfer. Steady, if not dramatic progress.