Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
... for me it's part of the learning curve.
Nice progress on your new little engine! Quote from: EricB on January 24, 2025, 02:05:53 AM... for me it's part of the learning curve.Yes, it's all part of the learning curve. And that, to me, is what makes this hobby so much fun - there's always something new to learn!Kim
... turns out it wasn't a good idea as it churned up the edges a little and I had to carefully file them away the burr. ...
Did you use a parting tool for the oil rings in the piston? The plan I'm roughly working to calls for 0.5 x 0.5mm slots. I don't have a ready made tool that narrow so used the end of a screw-cutting tool, turns out it wasn't a good idea as it churned up the edges a little and I had to carefully file them away the burr. Should have just gone with parting tool width slots instead
... The plan reccomends a set screw bearing on a pin to hold the flywheel in place. I made a single piece screw instead....
Quote from: EricB on January 25, 2025, 03:05:36 AM... The plan reccomends a set screw bearing on a pin to hold the flywheel in place. I made a single piece screw instead....A steel setscrew can raise a burr on the shaft that makes it difficult to remove the flywheel. A short brass rod between the screw and shaft prevents that from happening.
Quote from: PaulR on January 24, 2025, 09:12:58 AM... turns out it wasn't a good idea as it churned up the edges a little and I had to carefully file them away the burr. ...Next time stop turning the piston when it's about ten or 20 thousandths larger than desired. Cut your grooves, then finish turning the piston to size. Those last passes on the piston will remove any burrs left from the groove cutting.
Quote from: PaulR on January 24, 2025, 09:12:58 AMDid you use a parting tool for the oil rings in the piston? The plan I'm roughly working to calls for 0.5 x 0.5mm slots. I don't have a ready made tool that narrow so used the end of a screw-cutting tool, turns out it wasn't a good idea as it churned up the edges a little and I had to carefully file them away the burr. Should have just gone with parting tool width slots instead I made a special tool, more like a trepanning tool, to finish the cylinder on my first engine. It's become my go to tool for brass. I angled it into the piston so only a corner makes contact, leaving the grooves "V" shaped. It doesn't leave a burr.