Oilmanmojo : What you have shaired is quite exciting news.
The platter and the air bearing plates I devoted much time and effort. A few ideas I wish to pass on:
My platter's underside, showed signs of wear perhaps a result of gravity's "pull" loaping the edges and creating wear rings where the top plate rested.. The bearings are undersized to support large slugs of lead for decades.I relate(from observation) the top bearing plate's size (or lack thereof) allows some of the underside of the lead platter to be unsupported creating potental stress points where gravity's pull ,over time, could affect the trueness of the platter. Most of these all-lead platters have been a top undersized air bearing plates for 20-25 years, perhaps, enought time for gravity to do its job. Storage of the platter ,other than on its flat sides, could also affect its trueness.
Lead is a soft metal that is not as stable as say steel. Heavy casted lead parts do deform over time no matter what one does. Its size, weight, design & fuction all relate to lead's ability to hold onto its casted shape as I was to learn.
During my rebuild process, I learned that the platter did have casting defects (covered over by thick black paint-presume lead based paint) that were only resolved by spin balancing ,on a lathe, "trueing", out foundary defects with hand sanding and a lot of care. Quite a messy job that I did outsource to a professional. The platter now spins true without "wavey-ness" as it revolves.
Lloyd Walker conversted years ago , that the 'Nolls air bearing plates are "hardened" cautioning me they might shatter should they be afixed to a high-speed lathe for truing, or crack if harshly handeled/sanded. Sometime later, a dealer emailed that he purchased a 'Noll damaged in transit. He brought the parts , taking them to a machine shop for repair. He wrote the shop attempted to true the plates ,cracking them in the process.
Oilman, just passing this along for whatever value it may hold for your rebuild.
I am looking forward to your design of a outboard motor unit. Perhaps we can all benefit from your work.
The platter and the air bearing plates I devoted much time and effort. A few ideas I wish to pass on:
My platter's underside, showed signs of wear perhaps a result of gravity's "pull" loaping the edges and creating wear rings where the top plate rested.. The bearings are undersized to support large slugs of lead for decades.I relate(from observation) the top bearing plate's size (or lack thereof) allows some of the underside of the lead platter to be unsupported creating potental stress points where gravity's pull ,over time, could affect the trueness of the platter. Most of these all-lead platters have been a top undersized air bearing plates for 20-25 years, perhaps, enought time for gravity to do its job. Storage of the platter ,other than on its flat sides, could also affect its trueness.
Lead is a soft metal that is not as stable as say steel. Heavy casted lead parts do deform over time no matter what one does. Its size, weight, design & fuction all relate to lead's ability to hold onto its casted shape as I was to learn.
During my rebuild process, I learned that the platter did have casting defects (covered over by thick black paint-presume lead based paint) that were only resolved by spin balancing ,on a lathe, "trueing", out foundary defects with hand sanding and a lot of care. Quite a messy job that I did outsource to a professional. The platter now spins true without "wavey-ness" as it revolves.
Lloyd Walker conversted years ago , that the 'Nolls air bearing plates are "hardened" cautioning me they might shatter should they be afixed to a high-speed lathe for truing, or crack if harshly handeled/sanded. Sometime later, a dealer emailed that he purchased a 'Noll damaged in transit. He brought the parts , taking them to a machine shop for repair. He wrote the shop attempted to true the plates ,cracking them in the process.
Oilman, just passing this along for whatever value it may hold for your rebuild.
I am looking forward to your design of a outboard motor unit. Perhaps we can all benefit from your work.