Duramax Diesels Forum Truck of the Week
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Old 12-28-2008, 11:24 PM
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Default Some Basic Tubing Lingo

Quoted from Megs


Centerline Radius
On bends, this refers to the radius used to create the bend. The smaller the radius is, the “tighter” the bend. It is difficult to physically measure on anything but a U-Bend (180 degree bend). It is measured from the center point of one leg to the center of the other leg and divided by two. An easier way to measure is from the outside of one leg to the inside of the opposing leg. Remember that if the bend isn’t exactly 180 degrees it will affect your measurement.

Conical Length
Conical length is also the height, measured down the centerline of the cone. Conical length is not affected by taper of the cone.

Dimensions
For stock items, dimensions are stated in inches. The point they are measured from is stated in the specifications for that product. This link is to a popular conversion calculator.

Included Angle
The entire angle that contains the taper. Included angle is two times the taper.

Inlet
For cones, inlet generally refers to the smaller end of the cone. On collectors, the inlet is where the header pipes come into the collector.

Inside Diameter (ID)
Measured across the inside of the diameter. ID will vary from OD based on thickness of the material. It is equal to the outside diameter MINUS twice the material thickness. Typically you need to know an ID when you want one part to fit INSIDE another part. Cone Engineering designs components utilizing an ID with a fitment factor to allow room to insert the OD of the other part. For example, a flange for 1.50” OD tubing will be slightly oversized to allow insertion without additional fabrication.

Material Thickness (also Wall Thickness in tubing)
Measured in decimal or gauge (also gage). We generally use gauge as the decimal equivalent can be slightly different based on different measurement factors. Several good reference sources are available on the internet to assist in converting from one basis to another. Here is a link to a favorite web-based conversion chart.

Outlet
Outlet generally refers to the larger end of the cone or on collectors, refers to the exit end of the collector.

Outside Diameter (OD)
Measured across the outside of the diameter. It is also equal to the inside diameter PLUS twice the material thickness. Use this when you want one part to slip OVER another part or if you will be butt welding two parts together.

Side Length
Length of the cone measured down its side. Side length is affected by the taper of the cone. The greater the taper the larger the differential between the side length and conical length.

Taper (also known as “occluded angle”)
Taper is half the included angle of the cone. It is expressed in degrees and measured from vertical to each side of the cone. Each edge of the taper forms a leg of the angle which is a right angle. Click here for a Cone Calculator >> Cone Calculator to determine taper based on your desired cone dimensions.
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Old 12-29-2008, 06:11 AM
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Some are duplicates of the first post but there is some more info from this site.


Wall thickness: The thickness is in mm or inch measurement of the tube or pipe being mandrel or rotary draw bent, whether it be round tubing being mandrel or rotary draw bent, square tubing, heavy or light wall being mandrel or rotary draw bent, or rectangular pipe or tubing rotary drawn mandrel bent material. All & any other shapes of pipe or tubing that will need mandrel or some type of rotary draw bending.

Centerline Radius (CLR): measurement of the tube or pipe radius that you will be mandrel or rotary draw bending. This is the distance in mm or inches from the center of tube or pipe curvature to the centerline axis of the pipe or tubing that you will be mandrel bending, or rotary draw bending.

See instructions below to determine the (CLR):

Center Line Radius of tubing or pipe that you will be mandrel bending.

Degree: Angle in degrees for rotary draw mandrel tube bending is formed. (for example, 45 degrees of tube or pipe mandrel bending, 90 degrees of tube or pipe mandrel bending, or 180 degrees of tube or pipe mandrel bending).

Tangent: The straight portion of tubing or pipe on either side of arc that is being rotary drawn mandrel bent. Normally it will be the section of the pipe or tubing that you are mandrel bending that is in the clamped area.

Minimum Tangent: The minimum straight portion of the tubing or pipe that you are mandrel bending required by the tube or pipe bending machine to form the bend and maintain the shape of the pipe or tubing being bent.

Easy Way (EZ): Bending of a rectangular tubing or pipe. This is bending the workpiece on its short side during the mandrel bending process.

Hard Way (HW): Bending of a rectangular tubing or pipe. This is bending the workpiece on its long side during the mandrel bending process.

Easy way to determine the (CLR) Center Line Radius:

If you have a sample tube or pipe part that you want to mandrel or rotary draw bend available, place the tube or pipe that you want to mandrel bend on a large piece of paper or cardboard on the floor.

Trace the tube or pipe that you would like to mandrel bend onto the cardboard, continuing the pattern until you have made a full circle with the tubing or pipe that you are working with.

Measure (in mm or inches) from the center of the tubing or pipe to the center of your drawn circle. This straight line measurement to the pipe or tubing is the centerline radius of your tubing you want to rotary draw or mandrel bend.

J - Bends: J bends are normally tubes or pipes that have tight radius mandrel bends for the Exhaust Industry. Exhaust Headers use mandrel J bends. Exhaust Stacks: Mandrel Bending of tubes & pipes that require tight radius bending for Truck Exhaust Industry.

Types of Bends: J Bends, 180 D Bends, 1 D Bends: These are all Rotary Draw Mandrel Bending Terms. Mostly talked about in the truck exhaust, truck stacks & other automotive mandrel & rotary draw bending tube and pipe exhaust applications.

by Hines Bending Systems










equipment. Centerline Radius (CLR) Determining Tube Radius CLR Typical Types of Materials that can be Rotary Drawn & Mandrel Bent: Aluminum thin & heavy wall pipe & tubing, Stainless Steel thin and heavy wall pipe and tubing, Copper pipe and tubing thin & heavy wall, Brass pipe and tubing thin & heavy wall, Chrome Molly pipe and tubing heavy & thin wall, Aluminized pipe and tubing, heavy and thin wall, many other carbon steel alloys of pipe and tubing not mentioned....

NC Mandrel Bending Machine: Numerically Controlled Rotary Draw Mandrel tube & pipe bending machines.

CNC Mandrel Bending Machine: Computer Numerically Controlled Rotary Draw mandrel tube & pipe bending machines.

Mandrel Bending Dies: Tubing & Pipe bending dies designed specifically for tubing & pipe that must need a mandrel for supporting the inside of the pipe or tubing being bent along with a wiper die to keep the inside of the tubing or pipe being bent smooth on the inside as well as the exterior of the pipe or tubing going through the bending process.

Mandrel Extractor: Device attached at the rear of a rotary draw mandrel bender to remove the mandrel after the bending of the tube or pipe has taken place. While the tube or pipe has finished the bending process & still has the clamp die holding the tube or pipe, the mandrel is extracted from the workpiece.

Stack Dies: Used normally when 2 different bend radius are required on the same piece of tubing or pipe on CNC Pipe & tube bending application.

Leaf Style Bending Dies: Using Square or rectangular bending dies for pipe or tubing, Leaf Style dies are an easy way to remove the tubing or pipe that has been through the bending process. The leaf built in to the bending dies can easy remove the tubing or pipe from the bending die with little effort.

Rotary Draw Mandrel Bending Direct Die Actuator: This is an accessory that when bending shapes will allow the bending die to split in half to release the tubing or the pipe that is being bent. It is used quite often when bending tubes and pipes in the exercise equipment business as well as many other applications.
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Old 01-05-2009, 03:16 AM
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If anyone has any to add just let me know and I'll add them. Any questions, just start a new thread.
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