Cold Saw Blade Guide
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- Tooth pitch is measure as the distance from tooth tip to tooth tip. As a rule there should be 3-6 teeth in the cut.
- As a blade is resharpened, the tooth pitch is reduced. Therefore, retoothing can be necessary occasionally.
- The blade speed depends on the material to be cut. For the standard construction steel it should be about 50 rpm when using a 11″ blade.
- Feed is measured as the chip thickness per tooth per revolution (max. 0.1 mm – .004″) but is generally listed as inches per minute.
- Using the correct feed, the chips are bright, even in size and nicely rounded.
- Plenty of fluid must be used when cutting. Mixture 6-10%.
- Resharpened blades always have to be “run in”. Make 6-8 cuts with normal speed and about 25% of normal feed.
- If “pick up” occurs, the blade should always be dismantled and retoothed.
- Thorough cleaning of the blade and flanges before mounting is very important and the backlash in the device pins taken out. This can be done by putting slight pressure against the face of the tooth in a direction opposite to that of the saw rotation as the blade is being clamped.
- When purchasing new blades, it is important to be aware of the blade material, bore tolerance, possible surface treatment and side run out.
- Circular saw blades should always be resharpened on machines that secure an even tooth pitch. Resharpening with coolant improves the blade life.
- Tooth geometry must be adjusted to the work piece. For example when cutting stainless and aluminum, special ground blades for these materials should be used.
|Material to cut||10-20mm||20-40mm||40-60mm||60-90mm||90-110mm||110-130mm||130-150mm||150-170mm|
|Soft steel/ Alloy steel||6||8||10||12||14||18||18||18|
|Profiles: Wall thickn. 1/10 dia.||4||6||8||11||14||16||16||18|
|Profiles: Wall thickn. 1/20 dia.||3||4||5||6||6||8||10||12|
|Profiles: Wall thickn. 1/40 dia.||2||3||4||5||5||6||6||6|
|Material to cut||200-250mm 8″-10″||275-300mm 11″-12″||315-350mm 12.5″-14″|
|Med. hard steel||50||40||30|
ChipsToo low a feed:
Proper chips are not formed, only “metal crumbs”.
The blade is worn excessively and life is reduced.Too high a feed:
Discolored chips that weld in the gullets.
There is great risk that the blade will break.The correct feed:
The chips are nicely rounded, uniform and bright.
Maximum use and benefit of the blade.Chips:
Stability in fixture/viceA stable circular saw is the most important basis for obtaining good cutting results.Stability must be present in the machines main bearings, column and vice. A lack of stability leads to vibrations in the machine and/or blade. This vibration leads to substantial loss of blade life or at worst blade breakage.For cutting various profile shapes or tubes, a special formed vice can be beneficial.
Cleaning of BladesRemember to clean both the blade and flanges well when mounting a blade. A single chip between the blade or flange can lead to excessive side run out as well as reduced machine stability and cutting quality.
Running inAlways use “the run in procedure” for resharpened blades.Make 6-8 cuts with normal speed, but at only 25% of normal feed. Gradually increase the feed until normal feed is reached.The run in procedure hones the tooth tips removing the sharp fragile edges from the resharpening thus increasing blade life.
- Tooth form A:
- Primarily used for non-ferrous cutting of thin walled profiles. Only ground on specific request from customers.
- Tooth form A W:
- Primarily used for non-ferrous cutting of thin walled profiles or cutting plastic materials and combination materials of plastic and aluminum.
- Tooth form B:
- Rarely used unless a very high number of teeth are used. Used for non-ferrous cutting, plastic cutting or friction cutting. Form B is a stronger tooth than Form A and AW but is also primarily used for cutting thin sections.
- Tooth form B W:
- Used for cutting profiles and work pieces in smaller sizes. All kind of materials. Ground as a standard with tooth pitch T
- Tooth form C (HZ):
- Primarily used for cutting work pieces in larger sizes. Ground as a standard tooth pitch T≥5 mm as a standard. Tooth form C is a triple chip tooth form with pre cutter tooth and is self-centering.
- Chip breaker (Notch Grind):
- Ground on tooth form B. The tooth pitch has to be T>3.8 mm (.15″) and the kerf 2.2 mm (.087″). Used for cutting all kinds of materials. The tooth form is only used for cutting thin-walled profiles with a wall thickness of 1.5-2.5mm (.059″-.098″). Chip breaker tooth form increases the blade life, lowers the cutting time and reduces burrs. Should only be used for production cutting on stable machines.
- Standard no. 1:
- Used on both tooth form BW and C (HZ). A stronger tooth that increases life time on more demanding applications.
- Special tooth form:
- Tooth forms with altered tooth depths or angles can always be ground for special applications. Only ground on special request.
Pick upPick up is one of the most common problems when cutting steel with HSS cold saw blades.Pick up has occurred when bright pieces/deposits of material are welded to the side of the blade. This makes the side of the blade uneven and substantially reduces the cutting ability.Pick up occurs due to friction between the blade and the material.Pick up is especially a problem when cutting stainless.Pick up occurs as a consequence of these cutting conditions:
- lack of or wrong cooling/lubrication
- too many teeth in the blade
- too heavy a feed
- lack of cleaning away the chips (brush and fluid)
- lack of cutting ability/grinding
Blade qualityWhen buying HSS blades it is essential to be aware of the following:
- The blade must as a minimum be manufactured in M2 quality steel.
- Side run out tolerance should as a minimum not exceed 0.01% of the blade diameter
- Center bore should be H7 tolerance to ensure stisfactory roundness
- Blades for general use should have a surface coating such as the standard steam oxide treatment (black surface) to reduce friction
Resharpening qualityCorrect resharpening is of extreme importance for the life and cutting ability of a blade.Demands for resharpening include:
- correct tooth geometry (tooth pitch, form and depth)
- uniform tooth pitch
- resharpening with coolant
- roundness tolerance max. 30 µ
- correct beveling (tooth form B W and HZ)
- minimal yet adequate resharpening