A couple of pics of the build:
You can see the last issue. The post is now too short to center the disc. The machinist is making a new post longer by the thickness of the copper platen. Shouldn't take long.
An externally hosted image should be here but it was not working when we last tested it.
You can see the last issue. The post is now too short to center the disc. The machinist is making a new post longer by the thickness of the copper platen. Shouldn't take long.
Yeah. I can get #9. Anything smaller is unobtainium. Of course, the smaller the sphere, the more you can pack into a given cylinder. The greatest density involves a mix of sphere sizes. Some Russian geometer made a formula for that but the brain cells that retained that info died a while back.
Weight wise small is better. The fun begins with the vibration control. Small, large, combo, how much surface contact etc.etc.etc... And the bottom line when you get to the end of the math, is how does it sound? You should be between 30-40 lbs loaded, that seems to be a sweet spot.
Enjoy the ride
Tom
Enjoy the ride
Tom
You do have the copper top. How thick is the platter? The outside is most important. Not sure hole size, how many, and how deep. How much does weigh now?
You should be able to do the math for a close total weight. Subtract the removed aluminum weight then add the lead weight and your home.
Tom
You should be able to do the math for a close total weight. Subtract the removed aluminum weight then add the lead weight and your home.
Tom
Interesting.
I have been struggling with finishing options - my approach uses a combination of POM (Delrin) and Aluminium. Delrin is relatively easy to clean using isopropyl, but the aluminium platter, even when anodized, can sometimes "stain".
It turns out that the bearing oil I've found most success with (in my approach) is slightly alkaline, and that dissolves the oxide layer causing the "staining". Apparently I have trouble wiping the oil from my fingers before handling the platter.
Lacquering would be an interesting approach, but won't that chip?
I have been struggling with finishing options - my approach uses a combination of POM (Delrin) and Aluminium. Delrin is relatively easy to clean using isopropyl, but the aluminium platter, even when anodized, can sometimes "stain".
It turns out that the bearing oil I've found most success with (in my approach) is slightly alkaline, and that dissolves the oxide layer causing the "staining". Apparently I have trouble wiping the oil from my fingers before handling the platter.
Lacquering would be an interesting approach, but won't that chip?
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