User manual HUSQVARNA DR 350 T

[. . . ] Any persons not involved in the work should leave the working area. These signs give advice concerning your safety Always take care while using the machine. Use drills which are suitable for the work to be undertaken (speed, form, type of work, etc . Drilling pipes in the open : attach the machine to the pipe using one or two ratchet straps. [. . . ] Using the wheel, bring the rotating drill slowly into contact with the material to be drilled without exerting undue pressure. Boring the first centimetre is extremely critical and should be considered as the centring of the drill (exerting too much force will displace the drill sideways causing friction between the drill tube and the material which will increase as the depth increases). When the drill has been centred, increase the drilling force to obtain the correct penetration speed. Insufficient force will cause the diamond to become polished and thus lose its cutting ability, whereas too great a force will dislodge the diamond and result in excessive wear. Note : When cutting through reinforcing, reduce the force on the drill as the cutting speed in steel is less than that in concrete. If the initial rotation speed is high in relation to the diameter of the drill, the rotation speed should be reduced when cutting through reinforcing. The drill wear depends mainly on the density of the reinforcing being drilled, the abrasiveness of the concrete, the type of aggregate, the ratio of the drill diameter to the diameter of the reinforcing bars and the motor power used. When boring certain porous or cracked materials or when boring intersecting holes, all the water spray disappears into the material and no water will be seen running out of the bore hole. In this case, use the maximum water flow to be sure of cooling and lubricating the drill. The slurry, and therefore the drill, should never become warm. Close the hole immediately so that the core does not fall back into the hole (if the core is still inside the drill). If the motor stops suddenly, turn it off immediately. Try to remove the drill using the wheel without forcing. Unscrew the drill from the shaft using a spanner and remove it. Tap the sides of the drill tube with the wooden shaft of a hammer until the core comes completely out. Never bang the drill onto a hard surface or hit it with a metallic implement: this might dent the tube making it impossible to remove the core or to use the drill again, rendering it useless. If the core is jammed inside the drill, break it up using a cold chisel on the end striking along the length of the drill or pushing by means of the connecting shaft (hole saws). If the bore needs to be deepened, remove the drill only to ensure that the subsequent bore is centred. In both cases, insert a wooden or metallic wedge into the circular hole and force it in until the core breaks free. For bores deeper than the length of the drill, never remove the borer. Having removed the first core (as above), put the drill carefully back into the hole, connect the extension to it and screw the other end to the motor shaft. - Under no circumstances should you try to release the tool by bump-starting it . [. . . ] If the drill has wandered due to bad centring, move the axis slightly or bore with a larger drill (on the same axis). If there is a buried steel girder (100% steel boring), a wooden joist (expanding and jamming) or an elastic material (rubber), bore in another place. Scrapping In the event of deterioration and scrapping of the machine, the following items must be disposed of in accordance with the requirements of the legislation in force. It should be a 5% mixture with 100% synthetic oil for 2-stroke engines. [. . . ]