Ryobi DBJ50 Instructions d'exploitation télécharger pdf (Page 83)

Page 74 Power Equipment Usage Manual (Rev. 5/10)

m. NEVER PERFORM LAYOUT, ASSEMBLY, or set-up work on the table/work area when the machine

is running. A sudden slip could cause a hand to move into the wheel. Severe injury can result.

15.2. How to Sharpen

Bench grinders require a steady hand, concentration on the task and good

lighting to prevent serious injury.

15.2.1. Setup

The 8” lathe tool grinder uses white, friable aluminum oxide

grinding wheels that are designed to sharpen high speed steel

turning tools. It will also sharpen carbon steel turning tools. The

LEFT wheel is COURSE 60 grit and the RIGHT is FINE 120 grit. This

slow speed grinder is great for sharpening tools without

generating the tool destroying heat that you get so quickly from

3450 RPM grinders.

15.2.2. How to Use

Apply your safety gear, which should include face and eye

protective wear. Plug the grinder in, stand to the side of the wheel and then turn it on. Let the grinder

get its speed up before you move in front of the wheel.

Stand in front of the grinding wheel, holding the tool or part you are going to grind securely against the

tool rest. When grinding all tools only the very lightest weight should be applied in order to avoid

overheating the edge. Very often the weight of the tool on the grinding wheel provides enough

pressure.

• Begin to move it slowly and smoothly forward until it contacts the wheel. Prolonged contact

between the wheel and the tool should be avoided to prevent overheating the edge.

• Extreme changes in temperature may cause metal to become soft or brittle, so the goal is to

keep the metal from getting too hot. If considerable re-shaping of a tool is required then it must

be cooled by dipping the tip in water at frequent intervals.

• Use the coarse wheel for grinding away larger amounts of steel to reshape a tool and the fine

wheel to sharpen or touch up the cutting edge.

Overheating becomes apparent when the metal turns blue. When this happens to high speed steel it is

not too much of a problem since the steel will not have been softened. But when it happens to carbon

steel it means that the temper will have been taken out of the steel and the tool will not hold its edge.

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Ryobi DBJ50 Instructions d'exploitation Page 83