MAGNABEND 650E - Magnabend Accuracy Checks; Checking Machine Surface Parallelism

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CHECKING THE ACCURACY OF YOUR MACHINE

All functional surfaces of the Magnabend are manufactured to be straight and

flat to within 0.2 mm over the entire length of the machine.

The most critical aspects are:

1. the straightness of the working surface of the bending beam,

2. the straightness of the bending edge of the clamp bar, and

3. the parallelism of these two surfaces.

These surfaces can be checked with a precision straight -edge but another

good method of checking is to reference the surfaces to each other. To do

this:

1. Swing the bending beam up to the 90° position and hold it there. (The

beam can be locked in this position by placing a back-stop clamp collar

behind the angle slide on the handle).

2. Observe the gap between the bending edge of the clamp bar and the work-

ing surface of the bending beam. Using the clampbar adjusters set this

gap to 1 mm at each end (use a scrap piece of sheetmetal, or a feeler

gauge).

Check that the gap is the same all the way along the clampbar. Any variations should

be within ±0.2 mm. That is the gap should not exceed 1.2 mm and should not be less

than 0.8 mm. (If the adjustors do not read the same at each end then reset them as de-

scribed under MAINTENANCE).

Notes:

a. The straightness of the clampbar as observed in elevation (from the front)

is not important as this gets flattened out by magnetic clamping as soon as

the machine is activated.

b. The gap between the bending beam and the magnet body (as observed in

plan-view with the bending beam in its home position) is normally about 2

to 3 mm. This gap is not a functional aspect of the machine and does not

affect the bending accuracy.

c. The Magnabend can produce sharp folds in thinner gauges and in non -

ferrous materials such as aluminium and copper. However in thicker

gauges of steel and stainless steel do not expect to achieve a sharp fold

(see specifications).

d. Uniformity of the bend in thicker gauges can be enhanced by using scrap

pieces of the workpiece to fill in the unused portions under the clampbar.

ACCURACY