ISO 8504-3 pdf download – Preparation of steel substrates beforeapplication of paints and related products -Surface preparation methods — Part 3: Hand- and power-tool cleaning.
3.2.1.2 General conditions for carrying out the cycle
Preliminary test cycles shall be carried out if necessary to determine how best to actuate the accelerator and brake controls so as to achieve a cycle approximating to the theoretical cycle within the prescribed limits.
3.2.1.3 Use of the gearbox
The gearbox shall be used in accordance with the manufacturer’s instructions. II there are no manufacturer’s instructions, the following rules apply.
3.2.1.3.1 Manual gearbox
At a steady speed of 20 km/h. the engine speed shall as far as possible remain between 50 % and 90 % of the maximum speed. It this speed can be achieved using more than one gear, the engine is tested using the highest gear.
During acceleration, the engine shall be tested using the gear which allows maximum acceleration. The next higher gear shall be engaged, at the latest, when the engine speed has reached 110 % of the speed at which the maximum net power output occurs. During deceleration, the next lower gear shall he engaged before the engine begins to vibrate and, at the latest, when the engine speed has fallen to 30 % of the speed of the maximum net power. The first gear shall not be engaged during deceleration.
3.2.1.3.2 Automatic gearbox and torque converter The drive setting shall be used.
3.2.1.4 Tolerances
3.2.1.4.1 The theoretical speed shall be maintained to a tolerance oft 1 km/h during all phases. Speed tolerances greater than those prescribed are permitted during phase changes provided that the tolerances are never exceeded for more than 0,5 s on any one occasion, in all cases subject to the provisions of 3.2,2.5.2 and 3.2.2,6.3.
3.2.1.4.2 A tolerance oft 0,5 s above or below the theoretical Limes shall be allowed.
3.2.1.4.3 The speed and time tolerances are combined as indicated in 3.2.4.
3.2.1.4.4 The distance travelled during the cycle shall be measured within an accuracy of 10 m.
3.2.2 Procedure for chassis dynamometer tests
3.2.2.1 Special conditions for carrying out the cycle
3.2.2.1.1 The temperature In the premises where the chassis dynamonieter bench Is situated shall be between 293 K and 303 K throughout the test, and shall be as close as possible to the temperature of the premises where the mopeds were conditioned.
3.2.2.1.2 The moped shall as far as possible be horizontal during the test so as to avoid any abnormal distribution of the fuel.
3.2.2.1.3 During the test, the moped speed shall be plotted against time in order to check that the cycles have been performed correctly.
3.2.2.1.4 The temperatures of the cooling water and the crankcase oil may be recorded,
B.1 Acceptable power tools are those driven by either compressed air or electricity The tools might be attichcd to remote controlled or robotic equipment.
The types of tools which can he used include the following:
a) chipping hammers, rotary impact tool and rotary descalers for removal of rough scale. including heavy laminated scale;
b) needle guns for welds, recessed work and fasteners:
c) sanding machines, sanding discs, rotary wire brushes, rotary Impact tools, rotary abrasive-coated paper wheels (flap wheels), rotary finishing brushes having filaments impregnated with abrasive grit, and plastic fleece with embedded abrasive for removing rust, rust scale and paint;
d) power grinders to smooth welds, edges. etc.. prior to general finishing:
e) rotary impact tools to provide a surface profile.
8.2 Power-tool cleaning requires care to prevent excessive roughening of the steel surface. Ridges and burrs contribute to paint failures as sharp edges are often not covered by the specified thickness of paint. Similarly, excessive power wire brushing or disking can also he detrimental to paint adhesion. For instance, residual mill sc-ale can easily be burnished (polished) to a smooth surface to which paint will adhere poorly. The use of rwedle guns should be limited to welds, corners, uneven edges, etc.. as the impact of the needles can cause an unacceptable profile on flat surfaces. Grinding tools can cause “burn marks” in the substrate that can result in surface cracks, metallurgical alteration, and causes premature component failure.”Non’spark tools can be necessary In areas subject to fire or explosion hazards (see Annex A. bst paragraph).
ISO 8504-3 pdf download – Preparation of steel substrates beforeapplication of paints and related products -Surface preparation methods — Part 3: Hand- and power-tool cleaning
