- Ensure you are using the correct drill bit diameter and length.
- Ensure the location of the anchor won’t result in an attached karabiner being levered over an edge.
- Drill the hole slightly inverted for our twist-leg anchors and at right angles for both types of Titan Climbing anchors.
Titan staples require particularly skilled drilling to ensure both legs are centred in their respective holes. Use the staple leg to scratch a mark on the rock surface, drill a few millimetres, and then assess the leg positions before drilling deeper. This will enable the angling of the drill bit to re-correct hole alignment if necessary before continuing to full depth.
Important!!! – Ensuring sufficient hole depth is crucial for glue-in anchors with an interference fit for once they are tapped in, it can be difficult to twist the fixing out in the event the hole is short. The only downside to over-drilled holes is using more adhesive, and with experience, this can be ‘dialled back’.
Special note regarding our 150mm leg twist leg anchors – these extra long anchors can sometimes jam in hard rock due to the long embedment depth, despite the nominated hole diameter of 12mm or 16mm. We therefore recommend test fitting the anchor BEFORE proceeding to inject adhesive.
For all 6mm * 150mm twist leg anchors, we suggest using a 12.5mm (or 13mm) diameter bit.
For all 8mm * 150mm twist leg anchors, we suggest using a 17mm diameter bit.
These are not stock diameter bits and can be ordered from us or likely require special order from a drill bit supplier however will ensure sufficient interference fit to enable retention but prevent anchor jamming. Using a 14mm or 18mm diameter will eliminate all of the interference fit but won’t adversely affect strength.
Special note regarding notching
Whether to notch/provide a recess in the rock for the eye is often debated; however, foremost is that the EN959 certification does not require notching for the certification assessment. That said, we recommend notching/counter sinking / for larger eye glue-ins because a) it prevents a rope trap beneath the eye b) lessens the eye profile c) resists some flexing. Notching does not necessarily need to be deep to improve the profile of a glue-in and eliminate any catching of the rope beneath the eye. Note that notching can make glue-in anchor extraction harder when coring because the eye cannot be readily cut away by a cordless angle grinder.
Notching and the flex of a glue-in anchor eye is an issue for softer rock, and so counter sinking is standard practice for climbing areas such as the Blue Mountains of Australia.
Counter sinking requires careful management to ensure the notch is not so deep to recess the eye to cause karabiners to become levered (and therefore potentially snap when loaded from a leader fall).
Notching can be achieved by drilling a line of closely spaced shallow holes and breaking them through by angling the drill bit or by using a cross-head drill (as sold by us on the site) and feathering the drill speed while running the bit head up and down in a line to create a notch.
- Hole cleaning – this is absolutely critical. Using a hole-cleaning brush and blower, alternate between brushing and blowing the dust free of the hole until no more dust can be blown free. The number of times necessary will vary for different rock types, hole diameters and depths; however, several cycles (3 to 5) are common.
- Dry fit the anchor to ensure it will seat correctly and achieve full depth.
- Prepare the adhesive and dispenser according to the manufacturer’s instructions. Inject adhesive into the hole for at least 2/3rds of the hole. Don’t forget to release the pressure off the adhesive pack – this prevents adhesive dribbling all over the rock. Wipe the tip with a rag.
- Check the anchor is free from dirt or grease, then insert it into the hole, rotating the anchor to distribute adhesive around the shaft as it is inserted. Upon reaching the beginning of the inference fit it will be necessary to 'dress' the expelled adhesive into the recessed notch (if applicable).
- Using a NON-FEROUS hammer (rubber/wood or stainless steel), tap the anchor home, ensuring the eye is aligned in the likely direction of loading.
- Tidy up any excess adhesive, ensuring the base of the eye is covered on all sides. The hole and region surrounding the eye should be entirely filled with adhesive.
- Consider whether the anchor(s) could be unintentionally loaded by others before the adhesive has fully cured. Tape/tag the eye or attach a warning note as appropriate.
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