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Modified bolting cylinder for the Sandvik Axera DD421

Vastly extends lifespan at no extra cost

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While the Sandvik Axera DD421 two-boom development drill rig is technically designed for drilling tunnels, in Australia and New Zealand (much more so than overseas) it is often used to install rock bolts for ground support, which creates a lot more wear and tear on the boom than may have been intended.  

Early failure of original bolting cylinders 

Customers have been reporting the early and frequent failure of original bolting cylinders, coupled with unexplained cracks forming in feed cradles and DPUs that are also forming cracks earlier than would be expected.

MASPRO has identified the major components that struggle to cope with the demanding task of bolting, and our engineers have redesigned a number of these components used for this demanding operation giving much improved performance. 

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An area of focus is a redesigned bolting cylinder that delivers the full lifespan for all connected components at the equivalent cost of a standard replacement bolting cylinder.

Even in normal development drilling activities, bolting cylinders face extreme force. After all they are placed in the full extension position during bolting activities which exposes them to bruising from falling debris, corrosion from drill cuttings and harsh UG water, just to name a few.  

While bolting cylinders are often replaced through regular operation – the most common failures being leaking seals, damaged rods from external debris and in some cases bent rods  – our customers were losing time, money and productivity with failures way ahead of normal maintenance intervals. Some reports were well below 1000 percussion hours. 

Using advanced equipment and techniques including linear static analysis and finite element analysis (FEA) – a computerised method that predicts how parts react to force, vibration, heat and fluid flow – MASPRO engineers analysed precisely where the rods and cradle were excessively stressed at minimum and maximum loads. 

MASPRO now offers, as part of an improvement upgrade for use when rock bolting, a modified bolting cylinder which is a direct replacement for the standard design. This part alone alleviates a lot of the issues identified. 

By analysing, identifying and redesigning the part to relieve the stress caused by bolting, MASPRO has delivered exceptional performance improvements to our customers. 

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Vastly better performance, same cost 

Together, these improvements add up to significant savings in maintenance, downtime and part costs. The best part is that MASPRO’s modified bolting cylinder is available at a price point equivalent to the standard bolting cylinder, so you can improve your lifespan many times over without increasing costs. 

If you’re experiencing this problem, MASPRO can help by supplying fully assembled replacement cylinders, live ends for quick and easy maintenance, individual parts or fixed price cylinder repairs back to as-new condition. 

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MASPRO manufactures premium-quality spare and replacement parts for the mining industry. We specialise in underground and surface mobile equipment suitable for use with major brands such as Sandvik, Epiroc (Atlas Copco), Boart Longyear and Terex, and also provide repairs and services.

Officially established in 2006, MASPRO is a proudly Australian family-owned and operated company with manufacturing and testing facilities based in Condobolin, NSW. Our distribution centres in WA, QLD and TAS are strategically located for fast distribution of parts.

MASPRO is known for ease of ordering, responsive delivery and quality products, delivered through world-class engineering, manufacturing and testing. The result is a product as good as, if not better than, OEM to help maximise your equipment uptime, utilisation and productivity even in the harshest conditions.

To learn more or discuss your needs, give us a call on 1800 627 776, email [email protected] or head to www.maspro.com.au 

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