Hello!
I'm designing a small 7" cutter and would like to ask for feedback regarding the shown bearing design. Any serious flaws? Stuff I've overlooked?
Comments greatly appreciated.
Mart
Platter and bearing design
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Platter and bearing design
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Re: Platter and bearing design
Hey. Nice drawing!
I can be wrong but i would not do platter from two seperate parts. I would make it in one peace. Can be trouble to make it pricise without runout.
If you will use brass bearings then everything should be polished etc.
Anyway it can work if machined correctly.
Bearing 3 i think needs a fixing nut or something.
Have you thought about bronze bearings that are already made? Something like bronze sliding bearings? They have coatings etc...
Maybe I would think to used ballbearings. I was trying to find what bearings where used by scully or neumann but without success. Maybe someone will add a comment on this?
I can be wrong but i would not do platter from two seperate parts. I would make it in one peace. Can be trouble to make it pricise without runout.
If you will use brass bearings then everything should be polished etc.
Anyway it can work if machined correctly.
Bearing 3 i think needs a fixing nut or something.
Have you thought about bronze bearings that are already made? Something like bronze sliding bearings? They have coatings etc...
Maybe I would think to used ballbearings. I was trying to find what bearings where used by scully or neumann but without success. Maybe someone will add a comment on this?
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Re: Platter and bearing design
Bronze, yes, that's what I meant! Not Brass. Thanks.
Bearing 3 is that single ball. The orange plate below it is screwed into place.
The question is indeed: ball bearings or sliding bearings...
Bearing 3 is that single ball. The orange plate below it is screwed into place.
The question is indeed: ball bearings or sliding bearings...
Re: Platter and bearing design
bearing 3 plate - that one I had in mind. It can unscrew by itself, maybe not but better to secure it in place.
There are different types of ready made bronze bearings. I never tried them but I think it would be nicer to use ready made. Some sliding bearings are with a cut others without, so better to use without a cut. There are different types so better to use what do you thinkg would be the best.
There are different types of ready made bronze bearings. I never tried them but I think it would be nicer to use ready made. Some sliding bearings are with a cut others without, so better to use without a cut. There are different types so better to use what do you thinkg would be the best.
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Re: Platter and bearing design
'd' wrote: "bearing 3 plate - It can unscrew by itself " - Good point, thanks. I will add a small securing screw, perpendicular to the unscrewing movement.
I'm on my way looking for those " 3 types ".
I'm on my way looking for those " 3 types ".
Re: Platter and bearing design
There is a bit of a trap with bronze self lubricating bearings, they only really work if the surface speed is high enough, which is possibly not the case here, you might do better to organise lubrication of the bearings rather running them dry. I got stuffed good and proper trying to use a sintered bronze bearing for this, because the surface speed was too low.
How accurately can you do the grinding on a hardened shaft? Do you have a universal cylindrical grinder?
Were I doing it I might be tempted to do something involving conventional angular contact ball races, still needs to be accurate, but a set of super precision bearings with a bit of preload is likely far easier then trying to grind something as good when you are not a bearing specialist.
How accurately can you do the grinding on a hardened shaft? Do you have a universal cylindrical grinder?
Were I doing it I might be tempted to do something involving conventional angular contact ball races, still needs to be accurate, but a set of super precision bearings with a bit of preload is likely far easier then trying to grind something as good when you are not a bearing specialist.