pickup truck crane woes...

[r00n]

Good day all...

Am in the process of making a crane to mount in the back of a pickup truck... I'm using 3.5" x 1/4" pipe for the mounted piece and of course a 4" x 1/4" to slide over and swivel on it...

The problem is the 4" pipe isn't seamless... Anyone know of some process besides getting a piece of seamless pipe to get the seam out of about 3 feet of that 4" pipe ???

thanks
r00n

[Tailshaft56]

I can't think of any. Seamless comes from the DOM ( drawn over mandrel ) as opposed to the normal rolled pipe. If you need one tube to fit inside the other that another specialized product. The dimensions are different than standard pipe.

[arc]

talk to ur steel supplier and find some with close tolerances.

[cruizer]

Good day all...

Am in the process of making a crane to mount in the back of a pickup truck... I'm using 3.5" x 1/4" pipe for the mounted piece and of course a 4" x 1/4" to slide over and swivel on it...

The problem is the 4" pipe isn't seamless... Anyone know of some process besides getting a piece of seamless pipe to get the seam out of about 3 feet of that 4" pipe ???

thanks
r00n

What type of crane are you getting or using, I'm thinking of adding one to the back of my 1 ton.

[burninbriar]

Instead of using pipe with 0 tolerance fit, you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one, this will also reduce friction when you swivel it with a load on.

[cruizer]

Instead of using pipe with 0 tolerance fit, you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one, this will also reduce friction when you swivel it with a load on.

Or do what I did with my jib crane and insert roller bearings top and bottom into a 1/4" tube and a T-1 matching shaft in the center. Or I was thinking find a shaft and outer case with close tolerances and tap in a couple of grease nipples. It would turn easy & never corrode.

[Craig in Denver]

you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one.

I do this on my trailer ball receivers (male end) to keep the dang things from rattling. You can make it as snug as you want.