Determining proper tooth pitch, Coolant | Jet Tools CS-275, CS-315

14.2Determining proper tooth pitch

Proper tooth pitch depends on:

a)the size of the section;

b)the hardness of the material;

c)wall thickness.

Solid sections call for blades with a coarse tooth pitch, while small cross-sections require blades with finer teeth. This is because when cutting walls of small cross-section (1–7mm) profiles, it is important

that the number of teeth actually making the cut should not be too few, otherwise the effect obtained will be one of tearing rather than of chip removal, leading to a large increase in shearing stress. On the other hand, when cutting thick materials or solid sections using an excessively fine tooth pitch, the chip collects as a spiral inside the gullet, and since fine tooth pitches have small gullets, the accumulated chip will exceed the gullet capacity and press against the walls of the workpieces, resulting in poor cutting (same situation with soft materials), greater shearing stress and hence breakage of the blade.

Table 3

A larger pitch should be chosen when, as a result of the shape of the piece to be cut, the cross- section at any given point exceeds the average cross-section given above.

14.3Cutting and feeding speed

The cutting speed and the head feeding speed are limited by the amount of heat generated near to the points of the teeth. If the head feeding speed is too high, the cut will not be straight in either the vertical or the horizontal plane. As we have already said, the cutting speed depends on the strength (kg/mm2) and hardness (HRC) of the material and the dimensions of the thickest section. The feeding

speed depends on the cross-section of the material. Solid or thick-walled materials (thickness>5mm) can therefore be cut at high speed providing there is sufficient swarf removal by the blade, while thin-walled materials such as tubes or thin profiles must be cut with a low feeding speed.

A new blade requires a break- in period, during which time about half the normal feeding speed should be used.

14.4Coolant

The cooling fluid ensures that the blade teeth and material in the area of the cut do not overheat. The fluid must be an excellent lubricant so as to prevent abrasion of the teeth and welding of the chips to the teeth (seizing).

14.5Blade structure

For non-ferrous metals, it is common to use circular saws with a brazed hard metal HM cutting edge, consisting of a disc made of alloy tool steel (71Cr1) on which the shape of the teeth and the seats for the cutting edges are made of Widia K10. These saws have shown excellent wear resistance but low resistance to impact, which is in any case a minor problem with non-ferrous materials.

Table 4

14.6Types of blades

The blade required for the cold saw is of HM hard steel type since the machine is to be used for cutting non-ferrous materials. In addition to the size and pitch of the teeth, however, the blades also have different geometric characteristics in accordance with their particular use:

tooth cutting angle – may be negative or positive

tooth sharpening – may be BW with an alternate raked tooth or C with a roughing tooth raked on both sides and a non-raked finishing tooth

tooth pitch – the distance between the crest of one tooth and the crest of the next tooth (tooth pitch = T)

CS-315, CS-275 specifications

Jet Tools has a long-standing reputation for delivering quality woodworking and metalworking machinery, and their CS-275 and CS-315 bandsaw models exemplify that commitment to excellence. Designed with both professional woodworkers and hobbyists in mind, these saws are engineered to provide precision, power, and ease of use.

The CS-275 features a robust design that includes a heavy-duty cast iron frame providing stability and reducing vibration during operation. This enhances the accuracy of cuts. With a 2.5 HP motor, the CS-275 delivers ample power for most woodworking tasks, enabling users to tackle various materials, from softwoods to hardwoods. Its easy-to-read scale and quick blade change system make blade adjustments seamless. The saw blade can accommodate a range of widths, allowing users to switch between intricate cuts and larger operations without hassle.

On the other hand, the CS-315 takes it a step further with a 3 HP motor, catering to those who need more power for demanding projects. This model boasts an extended cutting capacity, which is perfect for larger workpieces. The dual table support system ensures maximum stability, while the integrated dust collection port helps maintain a clean work environment by minimizing debris and sawdust.

Both models incorporate Jet's advanced technology that prioritizes user safety and comfort. Features such as an oversized handwheel and a precision tensioning system allow for easy adjustments of the blade, ensuring optimal performance. The CS-275 and CS-315 are equipped with high-quality bearings and a precision ground cast iron table that provides a smooth surface for cutting, enhancing performance and longevity.

Additionally, these bandsaws share a common feature: a large viewing window that allows users to monitor their cutting line easily. This ensures that every cut is precise and increases overall productivity. The saws also come with a solid standard warranty, underscoring Jet Tools' confidence in their durability and quality.

In summary, whether you choose the CS-275 or the more powerful CS-315, Jet Tools offers robust construction, innovative technologies, and user-centered design. Both models are excellent additions to any workshop, providing reliability and performance that professionals and enthusiasts alike will appreciate.

Jet Tools CS-275, CS-315 Determining proper tooth pitch, Cutting and feeding speed, Coolant

Models: CS-315 CS-275