The A.L.T.A. Spa products are distinguished compared to traditional solutions of honing and roll burnishing due to internal finish that provides:

            • Improving of inside walls generatrix equaldistance, with reference to the rectilinear tube axle.
            • Inside Straightness, better than 1/1000 of the tube length towards the original one of the mother tube.
            • Controlled Roughness to ensure the seal has auto lubrication on a finished surface having only troughs (no peaks) and full steel planarity at 1 MY Max Depth bearing ratio.
            • Extreme surface cleaning, absence of metal micro-particles compared to traditional honing and roll burnishing

 

 

HONED SURFACE

(1000 enlargements)
Roughness 0,22 my Ra

Metallic microparts contained in the surface detach during  working of the piston with the risk of cracks and damaging.

 

 

 

 

 

 

ROLL BURNISHED SURFACE

(500 enlargements)
Roughness 0,19 my Ra

Steel fragments, squashed against the surface, may detach or be detached by external operations (like welding).

 

 

 

 

"ALTA" FINISHING SYSTEM SKIVED, HONED SURFACE

(500 enlargements)
Roughness 0,11 my Ra

Extreme surface cleaning,
absence of metal micro-particles,
presence of micro-troughs for oil retention and a prefect lubrification.

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