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1. 09:35 AM - Re: Babbitt or insert bearings (tools)
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| Subject: | Re: Babbitt or insert bearings |
Have not had to make this decision, but have done a LOT of research...
Insert bearings are superior to pure babbit. Bearings on turbines in nuclear power
plants are similar, but WAY WAY bigger and ultimately technological.
Furthermore, line boring a block, the process of enlarging the bearing seats for
inserts, isn't that hard. Any decent machine shop can do it.
Pure babbit is completely acceptable PROVIDING it's done correctly. I can and
do pour babbit for woodworking machines. It's a dying art... AND requires a fair
amount of specialized equipment and jigs do do a engine block. And then it
needs to be line bored anyway. In this case the line boring aligns the bearings
and puts them to size as they are not poured exactly to size.
As you can see it's the same old same old. Total compromise. The cost of materials
to pour is probably twenty bucks. The jigging is rare as hens teeth, although
totally low tech. An amateur machinist could make the stuff for no money,
just a lot of time at the lathe.
Once a block is machined for inserts, it's really a no brainer and inserts aren't
really that expensive. The key is finding a GOOD reliable machinist.
Should I ever get around to rebuilding my model a, I'll probably try to pour it
myself just for the satisfaction. Mistakes are easily repaired, just takes time.
No wasted materials really.
Tools
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http://forums.matronics.com/viewtopic.php?p=460014#460014
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