ALFRA 02070 Manuel D'utilisation page 13

Punching with round, square and oblong puncher
1. Pre-drilling with a twist drill or a multistep drill
Drilling diameter for standard punches:
• for screws with Ø 9,5 mm drill min. Ø 11,0 mm
• for TriStar split punches drill Ø 10,0 mm
• for screws with Ø 11,1 mm in stainless material drill min. Ø 11,5 mm
• for screws with Ø 19,0 mm drill min. Ø 20,4 mm
(pre drilling a smaller diameter und then punching is also possible).
2. Screw the hydraulic screw with the short thread side Ø 19,0 mm completely into the hydraulic cylinder.
3. Place the suitable spacer sleeves with the die on the hydraulic screw.
The application of a spacer sleeve is absolutely necessary.
4. Put the hydraulic screw through the pre drilled hole and screw in the round punch from the backside.
For square and oblong punches plug the punch on the axis guidance of the hydraulic screw and retain with the
corresponding counter nut. When mounting the hydraulic screw for square and oblong punches, screw only the
long threaded side into the punching head. Align the die to the crossline mark using the line mark on the stamp.
Pay attention on the right combination of punch and die. The diameter is stamped on
correspondingly.
Do not punch with incomplete screwed in punches. The whole thread turns of the punch have
to be screwed in on the hydraulic screw.
The punch should not hit the interior ground of the punch. This can cause damages to the tool
and on the hydraulic punching unit.
The punch must be screwed on, that a gentle contact with the sheet is given.
Ø 20,4 mm
Ø 10,0 mm
Ø 11,0 mm
Ø 11,5 mm
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