For new pitches when, as is often the case, good natural belays are scarce, you must place one or more bolts yourself. Doing so puts you in a position of responsibility both for the safety of future users of that bolt and for the conservation of the cave. The aim should always be to put in good bolts which will contribute to a safe rig with a minimum of further bolting needed.

This is easier said than done, and there is ample evidence of this in caves CUCC have explored over the years. The best place for a bolt may be far from obvious until the pitch has been descended. Or maybe the best place is obvious, but that place is hard to reach. It is tempting to try to reach for the best placement, but overstretching or an insecure perch may lead to a poor bolt in the perfect place. This is very much to be avoided, since it is now impossible to put a good bolt in the perfect place - the rock around the first placement will have been stressed and another bolt should not be placed closer than about 20 cm from it.

Placing bolts

The hole may be made in either of two ways. For the penalty of carrying considerable extra weight, a cordless power drill is the quickest way to drill the hole. The heaviest item is the drill battery, which must, of course, be removed from the cave each time it needs charging. This method is of the most use where a lot of bolts need to be placed on a pitch series relatively accessible from an entrance. Lots of bolts are also needed for climbs up or exposed traverses to reach inaccessible passages.

   
Bolting by Hand     Using the Drill

The older (and more reliable, but slower) method is to use the anchor itself as the drill bit, driven in by use of a hammer. 8mm self-drilling rock anchors have teeth around their bottom for this purpose. The anchor is attached to a bolt driver, which is then repeatedly pounded with a hammer, whilst rotating the anchor by hand every couple of whacks. When this gets a little stiff, the anchor is pulled out of its hole and the dust and rock chips blown out. The process is repeated until the top of the anchor is just below the rock surface. A small conical "wedge" is then inserted into end of the anchor (thin end into the anchor) and the pair put back in the hole. Three or four good hard whacks with the hammer "set" the anchor by driving the wedge into the bottom end, expanding it. Beware of hitting it too many times, as this will start to weaken the rock around the anchor.

The hole produced by the power drill is a different shape from that produced by hand - since the power drill bit has a pointed end. For this reason, if a self-drilling anchor is set into a powerdrill hole, the wedge will not be driven into the anchor and an unsafe placement will result. Either use a form of anchor specially intended for the power drilled holes, or finish the hole off with a self-drilling anchor to ensure the bottom end is square.