How to make a thin bushing

[Doug Gray]

Human hair is .003 ( I checked) head hair that is....

 

[francist]

Human hair is .003 ( I checked) head hair that is.

That's a pretty good average. I remember when I was about 12 and I got my first NSK mic -- I went around to all my family members and measured their hair. Assuming my technique was good (!) I got a range from 0.003" to 0.004". Black squirrel hair, as I recall, measured 0.002".

 

[cathead]

For some reason I am wondering about cat hair...

 

[ErichKeane]

The ideas above are the ticket. Turn down the shaft on your lathe a little, enough to hit a common/easy to bore size in a piece of bronze (and to rough it up a little!). Bore said piece of bronze to be the proper fit for your loctite. Use some loctite to permanently bond the bronze to the shaft, then turn it in place. A 20 thou wall thickness is not going to survive at all. Thats only about 6 pieces of paper thick!

 

[pdentrem]

How did the original fail? At the moment I would likely turn down the shaft and bond a bushing to the shaft and fit to the hole.
Pierre

 

[pontiac428]

For some reason I am wondering about cat hair...

That depends on the cat.

I would measure in µm with cat hair, because the correct pronunciation of the greek letter µ is "mew!"

 

[mmcmdl]

Every machinist knows about RCH's .

 

[Flyinfool]

There is also the option of building up the shaft with weld or brazing. Then you can machine to what you need and not have to worry about it coming off.

 

[bukwirm]

For some reason I am wondering about cat hair...

For two of my cats, I get 0.0008-0.0016 inches. For the third, I keep getting zeros for some reason, must be my technique.

 

[682bear]

FWIW...

I've made many bushings at work with .020" wall thickness... it's pretty common practice to repair worn bores.

I would not turn down the shaft much, if any... just 'rough it up' to give the adhesive some tooth to grip. Bore your material and loctite or epoxy it on, then turn to fit the bore.

-Bear