Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
Hi David, that piston just dont look rightThanks for the callcheers
Ian.The bottom of the piston groove has multiple scratches, across it's whole circumference. As though someone has dug out the original packing ring. But, what the packing was, is anyone's guess...... I was going to replace the piston with another brass one. But have steel, cast iron, aluminium, and graphite in stock. Any suggestions as to what to use? David D
Hi David, I have used my shop vacuum cleaner directly at the lathe near the cutting tool. So there was no dust flying around.
David, I think the Graphite is about the best choice you have there. The bore must be polished, then the piston turned to just about size, then polished down by wrapping a bit of plain paper around it (still in the lathe), just hold it as you would a bit of abrasive cloth. DO NOT GET OIL ON IT. I'v never used a graphite piston, but it should give good service in a polished bore. Graphite pistons in glass cylinders are used as door closers, in the likes of commercial buildings. At one time they were available as free samples from the manufacturers if you lived in USA. Ian S C