Re: Securing bushings in power tool
From: gothika (Vampyres_at_nettaxi.com)
Date: 07/20/04
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Date: Mon, 19 Jul 2004 21:07:18 -0500
On Sun, 18 Jul 2004 20:59:16 -0700, DaveC <me@privacy.net> wrote:
>On Sun, 18 Jul 2004 11:33:41 -0700, gothika wrote
>(in article <tuflf0tpnapv477q6184v2qke0jkf42kv1@4ax.com>):
>
>> You can sub that bronze bearing for a more durable steel.
>> The whole idea of using the bronze is that being a softer metal it
>> wears out instead of the tool steel shaft that runs in the
>> bearing.(also bronze or brass can be cooked in oil to provide a "sweat
>> out" lubricant.)
>> All the guy at the will call counter needs to know are three basic
>> dimns.: inside dia.(or shaft dia.), outside diameter, and length.
>> These can be gotten by miking the shaft and the casing for length and
>> bearing OD.
>>
>> If you opt for a steel replacement just use a good grade of grease for
>> lube. Virtually all steel bushing are going to be softer that the tool
>> steel shaft they'll mate to so shaft wear won't really be an
>> issue.(The motor will burn out long before you wear down a tool steel
>> shaft.)
>
>If grease is the lubricant (plenty being thrown around by the recip.
>mechanism and the rotary gears of the motor), is there any lubricant issue
>with steel? Since the failure mode was that the (bronze) bushings started
>sliding with the shaft rather than staying put in the housing, it doesn't
>seem that lubrication was an issue, but heat. (No signs of low-lubrication:
>burn marks, fried lube, etc.). But I don't want to starve the shaft if it was
>depending on the grease and the bronze bearing...
>
>> If yuo use the brass or bronze just soak it in hot machine oil over
>> night before installing.( A small pan on a hot plate will do. Just
>> make sure to set the temp below the burn point of the oil.)
>
>If I use oillite and heat it in oil, doesn't this run counter to the grease
>inside the housing?
>
You can use grease with any bearing/bushing.(oilite is old tech.)
If grease is used with bronze/brass you won't experience enough oil
sweat if you just use the bearings dry.(no presoaking in oil, just
pack with grease.)
It must be used with steel however.
Most of todays modern greases have a very high heat/friction
co-effecient. That means they won't drip off or burn dry.
You can use high temp disc brake grease either organic or synthetic.
High temp lithium grease will do fine as well.
Just coat the shaft and inside sleeve with it.(I also like to put a
small glob spread around the outside of the moving assemblies once
they're in place in the housing.)
>> I've found that most of the bearing/bushings used in power tools are
>> standard industry sizes so you shouldn't have a problem getting one
>> that fits. Try Grainers, Johnstones or MSC for starters.
>> If you live in a city with a MacFadden-dale industrial hardware
>> they'll have it for sure.
>
>I'll look around. It is metric, I think. It measures about 8 (id) x 16 (od) x
>16 (l).
You can use metric measurements tho' most industrial hardware shops
will go by machine gradients. Thousanths or mil's.
Converted you're measurements will be:
.315 id x .630 od x .630 L.
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