Punching in the sheet material of large diameter or curved forms used by drilling on the contour. However, the punching of the centers of the “contour” hole requires accuracy and is time consuming. Much faster the work will go if the core is to equip a retractable pointed foot with locking screw. Sticking with it the necessary distance between the edges, you can start punching without a preliminary marking: it is enough to set foot into the previous hole.
Recommend to read
THE AUTOMATIC FEEDER
a Little puppy should be fed several times a day at certain times. But what if one of the feedings no one is home? A reader of our magazine M. the Psalms (Moscow) offers in such cases to...
AND THE CARGO IS ON THE TRAILER
When the need arose for a trailer for transporting household goods, the problem of choice arose - which trailer to buy, fortunately there was this choice. But the difference in price was...
