Page 102 of catalogue Metal working machines of Optimum Maschinen Germany GmbH

INFORMATION ABOUT SAW BANDS

General information about saw bands
Workpiece The workpiece to be manufactured needs to be firmly clamped so that it can neither vibrate nor turn. Do not use any damaged, wrapped nor heavily deformed workpieces. The cut will be more exactly the nearer the band saw guidance are fixed to the workpiece.

Spacing (toothing) The toothing determines the number of teeth per one inch (25.4 mm). As a general rule it applies: The shorter the cutting length (e.g. profiles), the finer is the selected toothing. The larger the material cam (e.g. solid material), the more coarse is the used toothing. A too large toothing can cause cutting run off since chips are plugging the chip catch and the saw band is forced to deviate from its cutting line. A too little toothing can result in tooth breaks, since the cutting force on the single tooth is becoming too strong. At least three teeth should cam in to realize a commercial result. Optimum chip formation Cutting chips are the best indicator for the correctly adjusted feed and saw band speeds. Please have a look at the chips which you have produced and correctly adjust your feed.

Legend

M AT E R I A L

Solid square Carrier

Running in saw bands · The correct running in guarantees a long service life. · Sharp cutting edges with extremely small edge radiuses are the condition for high cutting capacities of the saw bands. · In order to achieve an optimum service life, we recommend you to run in the saw bands accordingly. · Determine the correct cutting speed (m/min) and the feed (mm/min) depending on the material and the dimension of your cutting material. · It is important that the new saw band should be used at about 50% of the determined feed. This way, it will be avoided that damages occur due to extremely sharp tooth cutting edges at too large chip thicknesses caused by micro splinters. · New saw bands can initially be liable to vibrations and to vibration noises. If this occurs, reduce the cutting speed a little. For smaller workpiece dimensions you should remove about 300-500 cm² of the cutting material in order to run-in the saw band. · If you machine larger workpiece dimensions, we recommend you to perform the running-in during a period of time of about 15 min. After the running in, slowly increase the feed to the initially determined target value.

Thick-walled tube

Solid round bar steel Solid flat bar steel Tube Thin chips which look like powder • Increase the feed or reduce the saw band speed.

Bunch

1
Burnt, heavy chips • Reduce the feed and/or the saw band speed.

Materials Construction steel/Machining steel Individual steels/Tempering steel Unalloyed tool steels/Roller bearing steels Alloyed tool steels/High-speed steels Stainless steels Heat-resistant steels/High-temperature alloy

Cutting speed (M42) 80 - 90 m/min 45 - 75 m/min 40 - 60 m/min 30 - 40 m/min 20 - 35 m/min 15 - 25 m/min

2 3 4 5 6 7 8

Structural steel Deep-drawing steel Machining steel Structural steel Tempering steel Case hardened steel Tempering steel Ball bearing Tool steel High-speed steel Tool steel Rust Acid-resisting steel Non-ferrous metals Cast iron

Curled, silver and warm chips • Optimum feed and saw band speed.

Toothing when using HSS bimetal bands
Standard toothing
Profile cross section < 12 mm 12 - 30 mm 30 - 50 mm 50 - 80 mm 80 - 100 mm 110 - 200 mm 110 - 200 mm 200 - 400 mm Number of teeth per inch 14 TPI 10 TPI 8 TPI 6 TPI 4 TPI 3 TPI 3 TPI 2 TPI

Combined toothing
Profile cross section < 25 mm 20 - 40 mm 25 - 70 mm 35 - 90 mm 50 - 100 mm 80 - 150 mm 120 - 350 mm 250 - 600 mm Number of teeth per inch 10 - 14 TPI 8 - 12 TPI 6 - 10 TPI 5 - 8 TPI 4 - 6 TPI 3 - 4 TPI 2 - 3 TPI 1.33 - 2 TPI

Cutting of tubes and profiles
Diameter Wall thickness 3 mm 8 mm 12 mm 15 mm 20 mm 30 mm 50 mm 100 mm 40 8 - 12 8 - 12 6 - 10 5-8 80 100 Toothing teeth (TPI) 8 - 12 6 - 10 5-8 4-6 4-6 3-4 8 - 12 6 - 10 5-8 4-6 4-6 3-4 150 8 - 12 5-8 4-6 4-6 4-5 3-4 3-4 200 6 - 10 4-6 4-6 3-4 4-5 2-3 2-3 2-3 300 6 - 10 4-6 4-6 3-4 4-5 2-3 2-3 1.33 - 2

The clear grey toothing is not included in the range of products

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