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ISCAR's solid carbide gundrills deliver • Maintains high precision hole center alignment
outstanding surface finish, which is crucial for • Surface roughness of Ra 0.4 - 1.6 µm
hollow valve applications. Diameter range: Ø0.9 – can be easily obtained
Ø16 mm (full solid carbide). • Reboring operations are often unnecessary
• Drilling accuracy from IT7
• Excellent straightness and concentricity The shaking effect forces this liquid to move up
and down along the stem, which dissipates the
heat from the valve head to the stem and cools
it. As a result, the valve head remains cooler and
hence lasts much longer and the risk of valve
burning, pre-ignition and loss of compression is
reduced. When undertaking these manufacturing
operations, in order to enable the sodium to
slide easily inside the valve stem, the surface
finish of the internal cavity needs to be as fine as
possible. For this particular application, ISCAR
suggests working with gundrills with an integral
tip and body made of solid carbide with either
steel or a carbide driver. These drills are designed
for conventional machines, machining centers,
lathes and dedicated gundrill machines. They are
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