Neat way to make a piston

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iron_goober
Posts: 27
Joined: Tue Jul 24, 2007 7:57 pm
First Name: John
Last Name: Roehling

Neat way to make a piston

Post by iron_goober »

Now, I tried this once but I didn't do it correctly, but apparently it
works. One way to make a tight fitting piston in a cylinder is to get
some JB weld, mix it up, take the cylinder that you are going to use
for the power piston, put a light coat of oil on in the inside of it
and pour the JB weld in. Let it set for the full 24 hours that is
recommended for full hardness, and then when it is dry, pop out the
piston with a hammer and punch. If it won't fit in the cylinder you
can sand it down with some fine grain sand paper and voila! a working
piston.

I read this somewhere about 2 years ago, and am currently without
means to machine a piston, so I am going to try it...I'll let you know
if it works.
iron_goober
Posts: 27
Joined: Tue Jul 24, 2007 7:57 pm
First Name: John
Last Name: Roehling

Response to Neat way to make a piston

Post by iron_goober »

Works like a charm. I just sprayed some cooking oil in the cylinder, put the mixed JB weld in and, voila, a nicely made piston. I just sanded the sides lightly and it is a nice close clearance fit but still slides easily. I'm sure using brass and aluminum or graphite is lower friction, but for those who do not have a lathe, this works very well.
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