Air Engine

Step 11: Cylinder - Drilling holes in flat

• Measure and mark the holes as per the working drawing, holding your work in a V-Block, centre punch, centre drill and drill the holes into the flat.
• Put the cylinder back into the lathe and re-drill at Ø10mm but be carefull not to make the hole any deeper (this removes any burrs from drilling the small holes into the flat..
• Use a countersink to deburr the edges of the hole.
• Sand the cylinder to create a good surface finish.