Need advice on building roller

[Redneck in training]

Easy. Let say the tank is standing up. Put the square on top of the tank such a way that one leg is vertical parallel to the tank axis and the other horizontal crossing the tank approximately at the center. Put a mark close to the center on the tank and the square. Place the square on the opposite side of the tank and put a mark on the tank under the mark on the square. The center is exactly in between the marks on the tank. Repeat 90 deg. from the first measurement.

 

[moored4]

And if the framing Sq isn't long enough then use vice grips or C clamps and clamp a stright edge on one leg that will extend down the side of the tank.

 

[bcp]

If I'm using a hole saw to make 1 1/2" holes for an axle, I can use that same hole saw to make a hole for a 1 1/2" NPT fitting.

A 1 1/2' hole will be much smaller than a fitting for 1 1/2" pipe. You may find a fitting that is about 1 1/2 inch OD but it will be for, maybe, a 1" pipe.

Pipe sizes:
Nominal Pipe Size - Wikipedia, the free encyclopedia

Couldn't find a fitting size chart.

Bruce

 

[brokenknee]

Easy. Let say the tank is standing up. Put the square on top of the tank such a way that one leg is vertical parallel to the tank axis and the other horizontal crossing the tank approximately at the center. Put a mark close to the center on the tank and the square. Place the square on the opposite side of the tank and put a mark on the tank under the mark on the square. The center is exactly in between the marks on the tank. Repeat 90 deg. from the first measurement.

Thanks, that makes sense.

 

[Ruark]

A 1 1/2' hole will be much smaller than a fitting for 1 1/2" pipe. You may find a fitting that is about 1 1/2 inch OD but it will be for, maybe, a 1" pipe.

Thanks - so say my fill/drain fitting will look like this:

http://tinyurl.com/7tr2tkg

And it's marked on the package as "1 1/2" X 1" ... My idea was to cut a 1 1/2" hole in the end of the tank, sit the fitting in there and weld around it. So you're saying a 1 1/2" hole would be too small for it? I appreciate your help.

 

[bcp]

Your link didn't work, so I can't comment on that fitting.

I don't have any loose large fittings to measure, but as an example, a 1/2 inch fitting was 1 1/4 diameter. A 3/4 inch fitting was 1 7/16 diameter.

Pipe measurements were established when pipes were made of lead and needed very thick walls to have any pressure resistance. Originally a 1/2 inch pipe was 1/2 inch inside diameter, with about 3/16 inch thick walls. As materials got better, wall thickness was reduced. But outside diameter and fitting ID size for the threads had to stay the same. Now the nominal pipe size has no relationship to any actual measurement.

Bruce

 

[Ruark]

Your link didn't work, so I can't comment on that fitting.

It should have worked. I'll try this:

This is just a plain galvanized bushing. I saw one at Lowe's for 3 or 4 bucks. The size is "1 1/2 X 1" inches. The idea is to weld it into a hole in the tank, and use a 1" threaded plug.

 

[bcp]

It should have worked. I'll try this:

This is just a plain galvanized bushing. I saw one at Lowe's for 3 or 4 bucks. The size is "1 1/2 X 1" inches. The idea is to weld it into a hole in the tank, and use a 1" threaded plug.

The 1 1/2 threads on the outside will be about 1 9/10 diameter.

 

[F250DSLPWR]

Easy and cheap, use a piece of 2 5/16" pipe for the axel thru the center of the tank and then for the axel hubs use two pieces of 3 1/2" pipe. One piece for each side to weld your Y frame to it. The 3 1/2" pipe will just slide over the 2 5/16" pipe with about an 1/8" slop. Drill a couple holes in the axel hubs and tap in a grease fitting for each. For a heavy duty low speed axel about as cheap and easy as it gets.

 

[Ruark]

The 1 1/2 threads on the outside will be about 1 9/10 diameter.

That seems about right. There's no such thing as a 1 9/10" hole saw. Maybe use a 1 7/8 (1.8750) and ream it out just a little if needed.

Axle - no, I'm using a 1 1/2" steel round bar. I found one for $35. I'll run it through, then weld it at the ends to seal the tank (it has to hold water, remember). Put 1 1/2" pillow bearings on the frame.