Order number: 6003

The Arch- and Ring-Bending Machine GEBR 603-K is universally applicable for many purposes in the metal working industry. The much proven and solid construction has been developed further and adapted to the modern requirements by GLASER. The result is a multi-functional Arch- and Ring -Bending Machine with an optimal price-efficiency balance. The Bending Machine GEBR 603-K is driven by a pole-reversible gear motor with two different speeds. It comprises two stationary, driven bending shafts and one floating pressure shaft with feed motion. The bending shafts are optionally driven with 6 or 12 revolutions per minute (rpm).

The guiding of the mechanical bearing support of the upper bending shaft are also hardened and polished. On both shaft outlets there are guiding rolls, which are adjustable crosswise to the rolling direction, thus enabling a traverse motion of the material. The position of the adjustable pressure shaft is shown on a scale. The feeding motion is done by means of a threaded spindle. It is recommendable to note the chosen adjustment of a certain radius, in order to facilitate a later repetition. The standard type contains a set of split steel rolls for the bending of arches and rings from flat and square materials, thick-walled square tubes as well as T-shaped sections and angle sections. The rolls can be opened step by step up to max. 40 mm. For round tubes special rolls with adequate diameters are supplied. Various attachments enable the accurate rolling of handrails for spiral staircases with solid or open newel. The bending shafts are manufactured from a special steel, hardened and polished. The shafts are supported by two precision taper roller bearings.

The Arch- and Ring-Bending Machine is placed on an underframe with an integrated tool box. A link connecting machine and frame enables the optional vertical or horizontal installation. The horizontal position is important for the rolling of work pieces with a large radius (such as handrails for spiral staircases with solid or open newel).

The Arch- and Ring-Bending Machine GEBR 603-K is operated by a double foot-switch.

Standard Accessories
1 set of standard split rolls
1 double foot-switch
1 spanner SW 22
1 spanner SW 30

Extra Accessories

No. 6034 - Pitch Arm for Spiral Rolling

When rolling handrails, cross bars and underrails for spiral staircases with solid or open newel, the tube has to be bent in the horizontal plane as well in the vertical line. This enables an additional Pitch Arm, which is fixed on the Arch- and Ring-Bending Machine GEBR 603-K behind the outlet of the arched tube. It presses by means of its guide roll the arched tube out of the plane. The guide roll can easily and accurately be adjusted in height. When bending a tube in the third axis the not yet treated part of the tube is automatically twisting. This twisting effect can be measured at the end of the tube with the Mechanical Twisting-Measuring Device GVM 610 (attachment) or with the Electronic Twisting-Measuring Device GBWZ 609 (attachment).

The radius of the rolled tube arch is indirectly measured with the Radius Sliding Caliper No. 6092 (attachment).

In the Spiral Calculation Program (attachment No. 6093) the pitch of the rolled tube can be calculated from the twisting effect of the non-rolled tube per a certain length (e.g. 7° per 290mm).

Accessories
1 socket screw hexagon wrench SW 17

Normally Arch- and Ring-Bending Machines are equipped with split standard steel rolls, by which most profiles of structural steel, such as flat iron, cross- and edgewise, T-shaped and angular iron, rectangular and square tubes, can be bent to arches and rings. Eventual deviations from the desired radius due to the material characteristics can be corrected by re-rolling or mechanical readjustment.

For the rolling of round tubes out of structural steel special rolls with respective profiles are applied avoiding an oval deformation of the tube cross-section during the rolling process. Also in this case eventual deviations from the desired radius due to the material characteristics can be corrected by re-rolling or mechanical readjustment. The rolling of handrails, underrails and cross bars out of stainless steel and brass for spiral staircases with solid and open newel makes high demands on an accurate execution. For this task the usual Arch- and Ring-Bending Machines have to be equipped with a Pitch Arm. Furthermore special mechanical and electronic measuring devices are available.

1. Pitch Arm
When rolling handrails, underrails and cross-bars for spiral staircases it is necessary to work out a certain pitch of the handrail, besides the arch. For this purpose a Pitch Arm is provided. The Pitch Arm is open on top so that the rolled material can easily be taken out. There is no problem even with a high pitch. Depending on the rolling of handrails for right- or left-turning staircases, the Pitch Arm is mounted either on the left or the right side of the machine. The position of the Pitch Arm is adjusted by a hand wheel and can be read on a digital display or a scale.

2. Plastic Rolls
It is recommendable to use high strength plastic rolls for the rolling of stainless steel- and brass-tubes. In case of steel rolls steel particles might eventually be transferred to the surface of the tubes, which may promote future corrosion. Rolling with plastic rolls avoids nearly any damage of the stainless steel- and brass-tubes.

3. The correction of a spiral arch is practically almost impossible
The correction of a spiral arch is almost impossible, for the reason that rolling of an arch by means of a Pitch Arm deforms the material in the third axis, which makes the spiral arch very hard to handle. The first rolling process is a defined rolling, the second one an undefined rolling. The solution of this problem is accurate rolling by GLASER's auxiliary technical attachments. Due to a Measurement Scheme where the staircase data are defined the desired arch with the respective pitch can perfectly be rolled.

4. Measuring of the bending radius
The radius of the rolled material is indirectly measured resp. calculated by a Radius Sliding Caliper as folIows: First the distance "chord - arch" is measured. Then the radius is read from a radii-table. This is applied to inside and outside radius. In addition to the radii-table GLASER developed a special Radii Calculation Program.

5. Measuring of the pitch in the rolling process
When rolling spirals the tube continuously twists. Before rolling the tube is divided into parts of e.g. 300 mm (control measurement). Then during the rolling process the twisting grade per control measurement is measured in angle degrees at the not yet rolled tube end with a Twisting Measuring Device. From the twisting grade per control measurement results the pitch of the rolled handrail.

6. The radius of a spiral arch
The radius of a spiral arch is larger than the radius of a plain arch due to the pitch. The dimensions, adjustment of the Radius Sliding Caliper as well as the actual radius, are calculated by the Spiral Calculation Program.

7. Spiral Calculation Program
Some years ago GLASER opened a bending centre where handrails, underrails and cross-bars for spiral staircases with open and solid newel as well as various frames are manufactured. The total production program is manufactured according to customer's requirements. Mathematics and technical experience are combined in a Spiral Calculation Program. Experience also induces the input of the different parameters. A Measurement Scheme (on the opposite) shows the floor height, the number of steps, the step width and the step radius. The calculated pitch height is compared with the value measured on site for controlling purposes. The Spiral Calculation Program additionally comprises two further calculation programs for the balustrade construction: a Radius Calculation Program and a Bar-Distance Calculation Program. The Radius Calculation Program has two functions: first it calculates the actual radius from the distance "chord-arch" measured by the Radius Sliding Caliper and on the other hand a desired radius is pre-set and the adjustment of the Radius Sliding Caliper is calculated. The Bar-Distance Calculation-Program determines the number of the necessary balusters calculated from the staircase data: length, angle and max. bar distance (e.g. 120mm width in the clear) and the clear distance between two bars. An even or odd number of balusters is optional.