Press Fit Help Request

[Art K]

Your Post about having different hammers next to the bench reminds me of a former co-worker who had a sticker on his toolbox saying Don't force it use a bigger hammer.
Art

 

[Charles Lamont]

Kvom--I have a bottle of green Loctite #648 which specifies "For Press Fit"---Even if it doesn't have any real bonding effect, it will act as a pressing lubricant.

Bear in mind that the copper in the brass will very probably cause the Loctite to cure very much faster than a steel to steel joint, and you are using a fast setting grade. It is likely to go off in a few seconds.

 

[Brian Rupnow]

I thought I should come back and post a fitting end to this thread. The undersize reamer I purchased had a diameter of .3735". The cold rolled shafts I had originally chosen to run as crankshaft ends in my engine were .374" diameter--- a thou under the optimum .375" which was my planned target diameter. They did press fit into the reamed holes, but with only .0005" interference, it was a pretty wimpy press fit. You couldn't push the shaft through with your fingers, but it certainly didn't take much grunt with my small arbor press. My next move was to get some nominal 3/8" drill rod, which comes in oversize at .3755". Now, with an interference of .002" it really took a lot of "grunt" with my small arbor press to assemble the crankshaft ends and flywheels. So---If you ever wonder, a really good press fit for a 3/8" shaft is to ream the hole .002" less in diameter than the measured diameter of the shaft going into it.--Brian

 

[kvom]

Since you were pressing steel into brass, a .002" difference is manageable. Steel on steel would be a different matter.