IMPERIAL 370-FH (01) PDF Document

The IMPERIAL 370-FH bender can be used for bending copper, aluminum, steel, stainless steel, and other tubing of bending temper (annealed). You should avoid use with extremely thin wall and/or hard temper tubing.

The tube bender comes with the tube clamp hook positioned for the smallest diameter tube. To reposition the tube clamp hook for other diameters:

1. Loosen the tube clamp screw far enough to move the clamp hook.

2. Insert the hook into the appropriate clamp stop.

3. Retighten the clamp screw.

The diameter of the tube is indicated at the bottom of the clamp on the form wheel.

1. Raise the form lever and position the tubing in the groove. It is important that the tube is engaged with the tube clamp hook to prevent slippage.

2. Lower the form lever until the “0” on the form lever and form wheel are aligned.

3. Pull the form lever down until the desired bend angle is obtained. The degree of bend is indicated when the “0” mark on the form lever aligns with the desired degree graduation on the form wheel.

1. Determine the desired centerline dimension (Dimension “L”) and place a mark “L” on the tube at that distance from the end.

2. Position the tube in the bender.

3. If the end measured is left of the tube-clamping hook, the mark “L” should be directly under the “L” graduation on the form lever faceplate. With a steady motion, pull the form lever handle around until the “0” mark on the form lever is directly opposite the 90° graduation on the form wheel.

4. If the end measured is to the right of the tube clamping hook, mark the tube at “R” distance and position it directly below the graduation “R” located on the form lever, then proceed with the bend in the same manner.

Place mark “L” on the tube. Refer to Table 1 for the “L” Dimension and subtract the appropriate Mark “B” value from the centerline requirement. Place a second mark “B” on the tube at this calculated spot. This second mark “B” should be placed on the right edge of the tube-clamping hook.

Table 1: For bends left of tube clamp hook (Must be subtracted from centerline requirement)

Place mark “R” on the tube. Refer to Table 2 for the “R” Dimension and add the distance shown to your mark, placing a second mark “B” on the tube. This second mark “B” should be placed on the right edge of the tube-clamping hook.

Table 2: For bends right of tube clamp hook (Must be added to the centerline requirement)

Yes, a scale on the form lever handle is provided. Follow these steps:

1. After mark “L” or “R” is determined, place the mark even with the appropriate graduation “L” (left) or “R” (right) for the appropriate tube diameter on the form lever handle.

2. Place a second mark “B” on the tube at the “HOOK ALIGNMENT MARK”.

3. Place the tube in the bender with the second mark “B” aligned with the right edge of the tube clamp hook.

To arrive at the exact tube length to fabricate a circuit, add all center-to-center dimensions of the tube circuit. For each 90° bend, subtract the amount shown in Chart A. Circuits are dimensions to square corners, therefore the tube is always less.

Chart A