There are specific cutter angle recommendations for machining stintered
bronze and I do not have them readily at hand. Having this info is a
requirement for DIY bearings as you are actually attempting to cleanly
cut each very small ball without smearing it.
On 01/29/2013 03:15 PM, Don Mayer wrote:
I tried making sintered bronze bearings when I started machining, maybe 35 years ago now.
Possibly because of less-than-adequate machining technique, I found that sintered bronze
produced greater friction on the mandrel shaft than did plain brass. I consequently
continue to use brass and have the ritual of oiling to contend with, but do that happily
in exchange for a mandrel which rotates with less effort, important when motors have lost
some of their "oomph" due to worn gear shaft pinions, gear teeth and the like.
I may have thought at the time that oiling the mandrel shaft was part of the cachet of
acoustic phonograph technology. I would enjoy hearing if others with better technique
have a better experience with sintered bronze than I did.
Regards,
Don Mayer
It is important to note the difference between bronze bushings and
sintered bronze bushings. The former require regular lubrication as does
any other plain bearing. But the sintering process produces a material that
is porous and will hold lubricant in its pores which significantly reduces
the need for regular oiling. Here's a description of proper and improper
machining of sintered bronze:
http://www.lm-tarbell.com/machining_sintered_bronze.htm
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