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| FAQ - FREQUENTLY ASKED QUESTIONS |
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For a better customer service herebelow we list some questions
and relevant answers from our technical department.
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The examined products are:
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ROTARY TABLES
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| - Are they available for clockwise or counter clockwise rotation? |
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Only the TAR 270 is available in both versions. The TAR 160 is
only clockwise version.
Anyhow the rotation direction cannot be changed during work.
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| - Can they work in vertical position? olor |
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Yes, the central shaft cannot be overloaded.
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| - Can you fix a top plate diameter 1500 or 2000 mm? |
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No, the maximum foreseen diameter is mm 990.
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| - How heavy a load can be transported? |
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100 kg on a 270 mm plate. On bigger diameters permissible loads
decrease exponentially.
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| - Can the rotation angle be set differently? |
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No, once the rotation angle is established it cannot be changed
during work.
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| - How fast can a rotary table turn? |
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See inertia calculations and diagrams.
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If delivered with electrical start control is the table suitable
for work with oil or water? |
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Yes, by remote control valve.
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What is the maximum axial load? |
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See conditions of use.
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In one station there is no error if the table itself is used as
index for top plate machining.
On different stations the accuracy is:
TAR 270 ± mm 0,05 on a 270 mm plate,
TAR 160 ± mm 0,1 on a 160 mm plate,
The accuracy decreases proportionally with diameter increase.
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| - On the model TAR 160 is the three indexing rotation available? |
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No, it is only possible on the TAR 270, asking for this model
in the ordering form.
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| - Are different rotations from the standard ones available? |
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Yes.
For TAR 270 maximum 40 parts.
For TAR 160 maximum 20 parts.
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| - How fast can you deliver a rotary table? |
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10 working days for a standard unit.
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PNEUMATIC FEEDER
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| - Min. and Max. material width? |
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From mm.10 to mm. 1000.
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| - Min. and Max. feeding stroke? |
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From mm. 1 to mm. 1000.
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| - How fast can the feeder work? |
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About 12 m/1’, with a maximum frequency of 180 cycles /1’.
See performances diagram.
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| - Can you program different strokes for one piece during work? |
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No, you can’t, for this function you need an electronic roller feeder.
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| - Min. and Max. material thickness? |
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From mm 0,1 to mm 5, according to the different models.
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Can you feed materials with special coating (prepainted, anodized,
silked) or not metallic material (paper, cardboard, plastic, wood)? |
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Yes, special jaws are to be mounted.
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| - Electropneumatic controls and shields, do they comply with the
standards? |
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Yes, the feeder is delivered complete with CE certificate, according
to Annex II ref. B of “Machine Directive” 98/37 CE.
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Is an openable shield with cycle stop available? |
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Yes, the air supply is discharged from the cylinder, whilst the
fixed jaws is kept under pressure to avoid material slipping.
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Can you use the same feeder for materials of very different thickness? |
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Yes, you have to adapt the height of the passage by adequate distancers.
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| - What about feeding accuracy? |
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Without pilots in the tool of the press accuracy is within ± mm
0,05, with pilots in the tool of course there is no error.
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10 to 25 working days according to different models.
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ROLLER FEEDERS
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| - Min. and Max. material width? |
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From mm.10 to mm. 400, according to feeder model.
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| - Min. and Max. material thickness? |
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From mm 0,3 to mm 2,5 according to the different models.
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| - Can you program different strokes for one piece during work? |
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Yes, you can freely program different strokes for one piece.
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| - Min. and Max. feeding length? |
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From mm. 1 to mm. 10000.
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Approx. 25 working days.
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DECOILERS
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| - Min and Max coil weight? |
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From 0 to 500 kg.
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| - Min and Max coil width? |
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From 30 to 300 mm
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16 rpm, that is to say 20 m/1’.
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| - Is a not driven decoiler available? |
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Yes it is, the braking torque is adjustable.
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| - Are start-stop control systems with prox. switch or photoelectric
cell available? |
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Yes, as an option.
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| - Is a coil end timer available? |
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Yes, as an option.
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PNEUMATIC PRESSES
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| - What is the maximum rated power of a pneumatic press. |
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From 1,5 to 20 kN , according to the model?
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| - What is the length of the power stroke? |
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According to the model 70 mm or 100 mm
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| - Is the power stroke length adjustable? |
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Yes, for the complete length.
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| - Do you sell the cylinder on the structure only without control
valves? |
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Yes, the client shall take care of the control valves and of the
CE declaration.
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Do you deliver a pressing unit without start signal control to
be installed in a complete machine? |
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Yes, it is delivered with CE declaration, type B, Annex 2, according
to Machine Directive 98/37 CE.
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| - Are the presses with two-hand control systems certified by a notified
body? |
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Yes, according to Annex IV of Machine Directive 98/37 CE.
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| - Is an antirotation device available as a standard? |
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Yes, a chromium plated steel rod is included inside the power
cylinder.
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| - Is it available a return time delay control at the end of the
working stroke? |
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Yes, an optional control system is available with such control.
The operator can leave his hands from the two-hand control when
the tool is closed.
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| - Is the open light adjustable? |
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Yes, on all the models.
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HYDROPNEUMATIC PRESSES
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| - What about the power range of G.P.A. hydropneumatic presses? |
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From 20 to 320 kN, according to the different models.
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In addition to the standard approach and working stroke length,
are special lengths available? |
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Yes, within a total stroke (approach + working) of 200 mm.
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| - Is an antirotation device available? |
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Yes, as an option.
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| - Do you sell the cylinder on the structure only without control
valves? |
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Yes, the client shall take care of the control valves and of the
CE declaration.
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| - Is the power stroke length adjustable? |
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Yes, in the standard model a mechanical stopper is foreseen, limiting
the pneumatic low pressure working stroke cylinder.
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Are the presses with two-hand control systems certified by a notified
body? |
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Yes, according to Annex IV of Machine Directive 98/37 CE.
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Is it available a return time delay control at the end of the
working stroke? |
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Yes, an optional control system is available with such control.
The operator can leave his hands from the two-hand control when
the tool is closed.
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| - How fast can a press work? |
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Please refer to performances diagrams.
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| - Is the open light of the press adjustable? |
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Yes, on 20, 40 and 70 kN models.
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DIAL FEED UNITS WITH PRESS
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What is the maximum press power and the maximum top plate diameter
for the combined unit rotary table with press? |
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All the available powers for our pneumatic and hydropneumatic
presses.
Standard top plates up to 600 mm. For bigger diameters the layout
is studied according to client’s requirements.
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| - Minimum and maximum cycle time? |
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They are to be defined according to the job of the press and to
the load on the rotary table.
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| - Are front and side shields included? |
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Yes, for the front side a pivoting shield is installed as a standard.
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| - Is the electropneumatic control system certified? |
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Yes, according to the European Safety Standards.
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| - Can you deliver photoelectric barriers? |
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Yes, if required by the client.
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PNEUMATIC CHUCKS
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| - What is the maximum blocking diameter and the maximum pliers diameter? |
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From 1 to 25 mm, according to the different models.
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| - Are pneumatic chucks single acting or double acting actuated? |
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Single acting.
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| - With the chucks do you deliver the pliers also? |
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No, we can deliver pliers on request.
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ROTARY CYLINDERS
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| - Minimum and maximum bore? |
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From 32 to 125 mm.
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| - Minimum and maximum standard rotation? |
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96° - 186° - 366°.
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| - Are special rotations available? |
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On request we can deliver rotations up to 720°.
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| - What do you mean by male or female shaft on the rotary cylinder? |
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Male = the pignon has a protruding shaft with key.
Female = the pignon has a hole shaft with inner key.
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SAFETY VALVE FOR PRESSES
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| - Which type of valve do you suggest for a 100 ton press? |
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For a correct selection the press power is not enough. We suggest
to refer to the clutch specifications or to the original valve
on the press.
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Can your electrovalves substitute similar valves by other manufacturers? |
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Yes, they take advantage of an inherent monitoring system.
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G.P.A. manufactures its electrovalves in 5 models:
Nominal size 10,
Nominal size 15,
Nominal size 20,
Nominal size 30,
Nominal size 40.
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| - Are your electrovalves approved by an institute? |
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Yes, G.P.A. electrovalves are approved by the German Institute
BG, which takes care of safety of metal sheet working machines.
They are certified according to the European Harmonized Standard
EN692, which deals with safety of mechanical presses.
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| - Do you deliver instructions for use? |
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Yes. With each electrovalve we deliver an instruction booklet
in six languages, including copy of the BG approval and serial
number of the valve.
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