Installing The Cast-Aluminum Master Clamps - Hürner HWT 400-M Manuel Utilisateur

Keep in mind that the angle value on the chart is the desired angled
of the finished bend. For instance, if you plan to produce a 45 deg.
joint, align both clamping assemblies on the 45 deg. value of the chart
rather than on the 22.5 deg. value.
The inner center of rotation and the inner angle chart on
both chariots are used to position the master clamps for
the production of segmented bends with a short radius;
Important
the outer angle chart and the outer center of rotation, for
straight joints of components and for segmented bends with
a standard radius.
Align the outside edges of the master clamps with the relevant angle
value on the chart. Fasten the clamps using four bolts on each of the
carriages: two in the slot at the rear, one each in the two slots at the
front. Arrange the bolts so they sit at the very edge or close to the
edge of the slots.
When the master clamping assemblies are ready, install the appropri-
ate reducer inserts in them if the size of the components to be welded
is smaller than the diameter of the master clamps. When fastening
the reducers in the clamps, be sure not to damage the surface of the
clamps by impacts of the reducers or the tools you use.
If a short-radius segmented bend is planned, install the special
reducer inserts on both sides. Double-check that the master clamps
are aligned with the inner angle chart on the carriage, using
the inner center of rotation. Then, to process a 90 mm outside-
diameter component, install the standard 125 mm reducer in the
clamp, or for an outside diameter of 110 mm, the 160 mm standard
reducer. On both sides, install the special insert with the desired
angle (22.5 deg., 30 deg.) needed for the component in hand in
the now-ready standard reducer using the appropriate bolts.

3.4.2 Installing the Cast-aluminum Master Clamps

Start the installation process only if the site where the ma-
chine is located meets the requirements per Sect. 2.6 above.
Use appropriate lifting tools to perform the installation.
Caution
On both carriages of the machine, slide the brass bolts into the centers
of rotation of the previously installed additional base plates (refer to
the introductory paragraphs of Sect. 3.4) and install the clamps on
them. Which clamps are required depends on the welding operation
in hand: for straight and segmented-bend joints or, optionally, for
tees and crosspieces or Y branch-offs. Molded components can also be
12
EN
Angle scale and arrange-
ments of fastening holes
for steel master clamps
HÜRNER HWT 400–M User's Manual
H Ü R N E R S c h w e i s s t e c h n i k G m b H
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Inner and outer centers of rota-
tion on both carriages for the
installation of steel master clamps
Special reducer insert 90 mm
for short radius set into steel
master clamp fitted with
125 mm reducer
Version January 2020