We also find threads used on pipes. With pipes we want them to fit tighter and tighter as we screw them together. The idea is that if you tighten them enough they won't leak. So these threads are tapered... kinda cone shaped. So when you see NPT (national pipe thread) you know it will be a tapered thread.
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When we are using water, it is ok to depend on the thread itself being a sealing surface. But when it comes to gas lines or refrigerant lines, we use what's called a flare fitting. There's a tool that forces the end of the tubing to flare out and that's the sealing surface. note with these fittings the thread inside the nut is not tapered, its is a straight thread.
Also note that for gas that is breathable like oxygen, the flare fittings use a normal right hand thread. But for gasses we should not breath like LP gas, argon (welding), CO2 (welding) the threads are left hand threads. The turn backwards to a normal nut and bolt.
So if you find a thread that looks odd or screws together backwards let that be a warning that it could be a flammable gas or a poisonous gas line.
Also note that for gas that is breathable like oxygen, the flare fittings use a normal right hand thread. But for gasses we should not breath like LP gas, argon (welding), CO2 (welding) the threads are left hand threads. The turn backwards to a normal nut and bolt.
So if you find a thread that looks odd or screws together backwards let that be a warning that it could be a flammable gas or a poisonous gas line.
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There is one last thread type I want to show you today.... pressurized hydraulic fittings are similar to the flare fittings I just showed you but they have a different angle on the flare. Again, if you find a thread or a fitting that doesn't fit something else, there's a reason for that. Hydraulic connectors have to routinely handle 3000psi 200bar. To make sure that other tubing doesn't explode, engineers designed hydraulic fittings to not work with other connectors.
JIC is an American hydraulic thread type. Joint Industry Counsel specified these connector types in the 1940s for hydraulics used on airplanes. We now use them on most hydraulic cylinders on tractors.
There is a metric version of this called DIN and there is a british version called 60 degree Whitworth Cone (BSP British Standard Pipe). The fun detail about the BSP is that it specifies the diamter in mm and the threads in threads per inch. What fun!
JIC is an American hydraulic thread type. Joint Industry Counsel specified these connector types in the 1940s for hydraulics used on airplanes. We now use them on most hydraulic cylinders on tractors.
There is a metric version of this called DIN and there is a british version called 60 degree Whitworth Cone (BSP British Standard Pipe). The fun detail about the BSP is that it specifies the diamter in mm and the threads in threads per inch. What fun!
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This is a combination square. You can use it with a pencil to draw straight lines along the ruler. But you can also use the thumbscrew to adjust the ruler in and out. For example, you can set the ruler to two inches and then lock down the thumbscrew. Now you can run the fat metal part of the square along the edge of a piece of wood and use your pencil on the end of the ruler to draw a straight line two inches from the edge.
But wait there's more... what if you forgot your pencil? There's a small awl in the handle that can be used to score wood or leave a scratch on metal!
But wait there's more... what if you forgot your pencil? There's a small awl in the handle that can be used to score wood or leave a scratch on metal!
Fun reading for the kids.
Two hillbillies talking:
MR ducks
MR not ducks.
OSMR. CM IDBD feet?
LIB MR ducks.
Any of you needing the hint.... MR ducks is pronounced 'Em Are Ducks. I'll let you take it from there.
Two hillbillies talking:
MR ducks
MR not ducks.
OSMR. CM IDBD feet?
LIB MR ducks.
Any of you needing the hint.... MR ducks is pronounced 'Em Are Ducks. I'll let you take it from there.
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