raveney
Well-Known Member
Hello All,
Last weekend I machined the sand casted flywheels. There was a fair bit of filing required to clean up the spokes, but the rest of the machining was straight up lathe work using a faceplate to bore the shaft, taper the hub, and cleanup a few spots where the pattern didn't pull cleanly on the inner rim.
Then I fastened each one to an 7/16" arbor and trued up the outer diameter. I had to use the boring bar upside down and run the lathe in reverse to get this to work on my 7X14 mini-lathe but got a very good finish using auto feed at 500 RPM with copious spraying of WD-40. The aluminum that was remelted to cast these is giving a very nice surface finish so far, unlike other extruded melts that I have done which were gummy and smeared.
Then I broached the keyways, primed the centers and set aside to dry. I will polish up right before final assembly as the aluminum seems to scratch easily unlike cast iron.
Last weekend I machined the sand casted flywheels. There was a fair bit of filing required to clean up the spokes, but the rest of the machining was straight up lathe work using a faceplate to bore the shaft, taper the hub, and cleanup a few spots where the pattern didn't pull cleanly on the inner rim.
Then I fastened each one to an 7/16" arbor and trued up the outer diameter. I had to use the boring bar upside down and run the lathe in reverse to get this to work on my 7X14 mini-lathe but got a very good finish using auto feed at 500 RPM with copious spraying of WD-40. The aluminum that was remelted to cast these is giving a very nice surface finish so far, unlike other extruded melts that I have done which were gummy and smeared.
Then I broached the keyways, primed the centers and set aside to dry. I will polish up right before final assembly as the aluminum seems to scratch easily unlike cast iron.
![Faceplate.jpg Faceplate.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/96/96236-Faceplate.jpg)
![arbor.jpg arbor.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/96/96237-arbor.jpg)
![finished_FW.jpg finished_FW.jpg](https://cdn.imagearchive.com/homemodelenginemachinist/data/attach/96/96238-finished-FW.jpg)