BS EN 1870-5:2002 pdf download

BS EN 1870-5:2002 pdf download.Safety of woodworking machines – Circular  sawing machines – Part 5: Circular sawbenches/up-cutting cross-cut sawing machines.
5.1.5 Failure of the power supply
On electrically driven machines an automatic reslarl in the case of a supply Interruption after the restoration of the supply voltage shall be prevented in accordance with 7.5 paragraphs 1 and 301 EN 60204-1:1992.
Verification: By checking the relevant drawings and/or cicuit diagrams, inspection and relevant functional testing of the machine.
5.1.6 FaIlure of the control circuits
See 5.1.1.
5.2 ProtectIon against mechanical hazards
5.2.1 StabIlity
Machines shall be equipped with a facility to fix the machine to the floor, e.g. by providing fixing holes In the machine frame.
The machine rigidity shall be m accordance with the requirements of Annex A.
Machines Intended to be moved using a crane or hoist shall be equipped with provision for lifting devices, e.g. lifting eyes, correctly positioned relative to the machine centre of gravity.
Transportable machines fitted wilh wheels shall have facilities to mae them stable during cutting e.g. brakes for the wheels or a device to retract the wheels from the floor.
NOTE The requirements for a stability test for transportable machines with wheels, born when moved from iocabon to locslon and when In use, will be considered at the tlrst revnion of this standard
Verification: By checking the relevant drawings, inspection and relevant functional testing of the machine.
5.22 RIsk of break-up during operation
The guards for the sawbtade shall be manufactured from:
a) steel having an ultimate tensile strength of at least 350 N mm and a wall Thickness of at least 1,5 mm:
b) light alloy with characteristics in accordance with Table 2;
Saw spnidles shall be manufactured in accordance with the tolerances given in Annex B.
Vertfication: By checking the relevant drawings, inspection, measurement and relevant functional testing of the
machine.
5.2.3.2 Spindle locking
When it is necessary to hold the spindle stationary for tool changing, a spindle holding device shall be provided.
TWs may be e.g. a double spanner arrangement, or an integral locking bar inseried through the spindle. This bar
shal have a minimum diameter of 8 mm and be made train steel with an ultimate tensile strength of at least
350N mm2.
Locking bars shall prevenl the spindle from rotating lIthe spindle drive motor Is inadvertently switched on.
Verification By checking the relevant drawings, inspection measurement, conlirmation from the steel bar manufacturer and relevant functional testing at the machine Alternatively on machines with locking bars, by the following test After starling the spindle &ive motor with the locking bar in place the spindle shall remain stationary.
5.2.3.3 Sawblade fixing device
Saw flanges (or in the case of flush mounted sawbiades a flange) shall be provided.
For sawblades with a diameter 450 mm the diameter of both flanges (or flange for flush mounting) shall be at least 1Y4 (where D = the maximum diameter of the sawbiade for which the machine is deslgned)
For sawtfades with a diameter,. 45() mm, the diameter of the flanges (or flange for flush mounting) shall be at least ,butnotlessthan 115mm,
For flanges other than those for IkiSli mounted sawblades the clamping surface at the outside part of flange shall be at least 5 mm in width and recessed to the centre (see Figure 8).
Where two flanges are provided, both outside diameters shall be within a limit deviation of ± 1 mm.
Precautions shall be taken to ensure that the sawblade does not come loose during start’up, running, rundown or braking, e.g. by using a positive connection between the spindle and the sawblade, or by using a positive connection between the front saw flange and the saw spindle
5.2.4 Braking
5.2.4.1 General
An automatic brake shall be provided for the saw spindle where the unbraked run-down time is more than 10 s.
The braked run-down time shall be less than 10 s.
Electrical braking shall not be by reverse current.
Verification : For the determination of unbraked run-down time and braked run-down time, if relevant, see the appropriate test below.