cutting a rock with feathers and wedges скачать в хорошем качестве

cutting a rock with feathers and wedges

The tail end of a cut I made in a chunk of granite (?) with feathers & wedges. Normally, I'd wait a minute or two between striking the feathers but I was a little impatient here and the cut wasn't too deep. Notes: Use a rotary hammerdrill for drilling the holes. I bought a factory refurbished Bosch 11224VSR on ebay for about $120 and it worked great. Wear hand, eye, ear and respiratory protection. With a cold chisel, clear away any easily flaking stone until you get down to hard stone. Any soft or crumbly stone will hinder the feather and wedges from pushing with enough force to start a crack. If working on a large rock, buy more sets of feather and wedges than you think you need. 14 (2 $20 sets of 7 ) was barely enough for 4ft cuts. The ebay search "plug wedges and feather 7" returns a set very similar to what I used. Use the correct size of bit with the wedges. The ebay listing for the ones I used specified 9/16". Half inch worked too but I noticed a huge spike in broken feathers. Space holes at about 4-5 inches apart MAX. The closer they are together, the faster and cleaner a crack will propagate through the rock. Keep the holes perpendicular (normal) to the surface of the stone and as close to the same plane as possible. The deeper the hole and the more the holes can agree on a single plane or arc (i.e. any path the string of a free-hanging pendulum could cut through the air), the more likely the cut will follow that path through the rock. The point of diminishing returns is about 10" to 12" depth-of-hole? Hold the drill firmly but don't put your weight behind it. Let the drill "float" a little bit on the cushion created by the hammering action. Don't let the bit rub against the side of the hole. Pick an angle and stick with it. I found that vertical holes tend to be easier than horizontal holes. After drilling each hole, alternate with at least one other drill bit. Drilling multiple holes in a row without allowing the bit to cool will cause the bit to quickly lose its carbide heads (once lost or chipped, the bits are useless). Leave the inactive bit in a bucket of water. After removing a bit from the drill, the shank of the drill (what goes into the drill) will burn you. Wear gloves when touching a freshly used bit. position each feather and wedge assembly so that the feathers are even (one is not higher than the other) and the curved shoulder of the feather sits on the lip of the hole. Try to position the wedge so the curved surface of the feathers make full contact with the inner surface of the hole. once all holes are drilled, brush and wash away as much rock dust as you can manage. With a clean surface, you can see when a hairline crack starts to form. Rotate the wedges in the holes so that the wide part of each follows a smooth line through the stone. Once all the wedges are in place by hand, lightly tap the wedge with your hammer until you feel the tension hit a wall and the pitch of the struck wedge settles into a high pitch. Make sure the wedge doesn't get misaligned from the feathers. It's okay to tap it back into alignment from either side. Once the wedges are firmly seated with light strikes, you can proceed to hit each wedge firmly once or twice then pause for the stone to relax. (1,1, 2, 2, 3, 3, 4, 4, 5, 5, ... n, n, wait 2m, repeat) 1-2 minutes works well for smaller stones (1-2 feet of thickness) between cuts, more (~5m) if working with a particularly thick piece of stone. The less time you wait between striking the wedges, the more likely the cut will take a curved (in a bad way) path through the stone. It's not worth it. Just drink some water or eat a snack, the stone will still be there. Roughly roughly 10-15 rounds of tensioning and waiting is enough for most stones to fracture. If you really have trouble waiting and you have multiple cuts to make, you can use the time between cuts to drill a single additional hole for the next line of holes. (hit 1, 2, 3, 4, 5, ... n, drill hole*, hit 1, 2, 3, 4, 5, ..., n, *drill hole etc.)