Wiktor Wise
Electric band sawmills are a popular choice for woodworking enthusiasts and professionals alike. When it comes to choosing the right amount of horsepower for an electric band sawmill, there are a few factors to consider, including the type of wood being cut, the desired milling speed, and the size of the logs. While a 13 horsepower gasoline engine is commonly used for bandsaw mills, electric motors offer greater torque and can provide more power at a given horsepower. For instance, a 10 HP electric motor can offer better performance than a 10 HP gas engine. Woodmizer, a popular manufacturer of electric band sawmills, offers models with a range of horsepower options, from 10 HP to 38 HP, with some users opting for upgrades to 20 HP or even 30 HP to speed up cutting large frozen logs. It's important to consult with experts and consider the specific requirements of your milling projects to determine the optimal horsepower for your electric band sawmill.
| Characteristics | Values |
|---|---|
| Horsepower | 2 HP, 3 HP, 5 HP, 7 HP, 10 HP, 13 HP, 14 HP, 16 HP, 20 HP, 23 HP, 25 HP, 38 HP, 55 HP |
| Gasoline Engine Horsepower Equivalent | 15 HP |
| Voltage | 230V, 240V |
| Hertz | 60 Hz |
| Phase | Single, Three |
| Amps | 45, 40 |
| RPM | 3450 |
| Frame Size | 215T |
| Service Factor | 1.00 |
| Rating | 40C AMB-CONT |
| Locked Rotor Code | H |
| NEMA Design Code | L |
| Insulation Class | F |
| Full Load Efficiency | 82 |
| Power Factor | 98 |
| Enclosure | TEFC |
| Bearing | 6307 ODE, 6206 |
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What You'll Learn
- Electric motors have a higher performance than gas engines at the same horsepower
- A 10 HP electric motor works better than a 10 HP gas motor
- A 13 HP motor is enough to saw 18 hard maple, but more power is preferable
- A 15 HP electric motor is not available in single-phase
- A 10 HP single-phase motor may cause power fluctuations
Electric motors have a higher performance than gas engines at the same horsepower
Electric motors have several advantages over gas engines when it comes to performance, especially when considering the horsepower. Firstly, electric motors deliver power more consistently across the entire rpm range, resulting in higher performance at both high and low rpm ranges, except for the peak rpm. This is because electric motors can put out their maximum torque at zero rpm or low rpm, whereas gas engines have a maximum torque at a specific, usually higher, rpm.
This difference in power delivery means that a 10 hp electric motor can often perform similarly to a 20 hp gas engine. Electric motors have a flatter hp vs. rpm curve, also known as a wide powerband, which allows them to maintain their rpm with high torque over a wide range. This results in a higher rate of work done by electric motors compared to gas engines of the same horsepower.
For example, a 15 hp electric motor may be able to provide similar performance to a 30 hp gas engine. This is because the electric motor is constantly under torque and does not lose power during the intake, compression, and exhaust strokes like a gas engine. Additionally, electric motors do not have issues with reciprocating mass, reducing drag, increasing efficiency, and sending more power to the wheels.
When considering the performance of electric motors versus gas engines, it is important to look beyond just horsepower and consider the torque and rpm as well. The torque, horsepower, and rpm together give a better understanding of the engine's performance characteristics.
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A 10 HP electric motor works better than a 10 HP gas motor
Electric motors are more efficient than gasoline engines, as they perform more work at a given horsepower due to their constant torque. This means that a 10 HP electric motor will outperform a 10 HP gas motor.
Firstly, the rated speed of an electric motor is around 1,750 RPM, while a gas engine typically operates at 3,800 RPM. When calculating HP, the formula is HP = Torque x Speed x 32,572. Therefore, a 20 HP gas engine run at 1,750 RPM (the speed of an electric motor) will only provide around 9.21 HP.
Secondly, electric motors produce power every single revolution, while gas engines only produce power every other revolution of the crankshaft. This means that a 10 HP electric motor will provide the same amount of power as a 20 HP gas engine.
Additionally, electric motors have more torque at the same horsepower rating. Torque is the force that enables the blade to cut through wood. With a gas engine, there is no reserve in torque output, so when the torque demand increases, the engine slows down and loses RPM. On the other hand, electric motors provide more torque as their speed lowers, resulting in a more consistent performance.
Finally, there is significantly more friction loss in a gas engine, impacting its efficiency. The efficiency of a gas-powered engine is about 33%, while an electric motor is very close to 100% efficient.
In conclusion, a 10 HP electric motor will provide superior performance compared to a 10 HP gas motor for a band sawmill due to its higher torque, consistent RPM, and greater efficiency.
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A 13 HP motor is enough to saw 18 hard maple, but more power is preferable
The horsepower required for a band sawmill depends on the type of wood being sawed and the desired speed of the cuts. Electric motors have constant torque and can therefore perform more work than a gasoline engine with the same horsepower.
A 13 HP motor is typically used for bandsaw mills. This is enough to saw 18 hard maple, but more power is preferable to speed up the cutting process. Hard maple is a dense and strong wood that is harder than soft maple. It is also known as rock maple, sugar maple, or Acer saccharum.
For larger logs or frozen wood, a higher horsepower motor may be needed. For example, one user upgraded from a 13 HP motor to a 20 HP motor to speed up the cutting process for large frozen logs. Another user reported that their mill, equipped with a 25 HP Kohler V-twin motor, could handle logs up to 30" x 21.5' in size and had cut boards as wide as 22".
The largest Woodmizer mill comes with a 23 HP gas engine, but electric motors with higher horsepower are also available, such as a 30 HP electric motor. Ultimately, the decision on how much horsepower is needed depends on the specific requirements of the sawmill and the type of wood being processed.
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A 15 HP electric motor is not available in single-phase
Electric motors are a popular choice for powering sawmills. This is because they perform more work at a given horsepower than a gasoline engine due to their constant torque. A 15 HP electric motor is not available in single-phase as per some forum users. This is because single-phase motors are used less frequently in industrial applications. Single-phase motors are more commonly used in domestic settings, such as powering vacuum cleaners, refrigerators, and air conditioners.
Three-phase motors, on the other hand, are widely used in industrial and commercial settings to operate larger machinery with greater power requirements. In three-phase power, there are three conductors of electrical current, each operating at a phase difference of 120 degrees or 2π/3 radians apart. This results in a smoother and more efficient power delivery compared to single-phase motors.
While it may be possible to operate a three-phase motor with single-phase power, it will result in reduced power output. Additionally, three-phase motors lack a starter mechanism, so an alternative method to get the motor spinning must be employed before turning it on.
Some forum users have discussed the possibility of using a smaller single-phase motor for a sawmill, acknowledging that it will result in slower operation. Others have suggested using a three-phase converter to run a three-phase motor with single-phase power. However, it is important to note that a converter will add to the overall power consumption to compensate for losses.
It is worth mentioning that the horsepower requirements for sawmills can vary. Some sources mention using a 2 HP 3-phase motor programmed to run at 3 HP, while others state that most commercial bandsaw mills use a 15 HP gasoline engine. It is important to consider the specific requirements and constraints of your application when determining the appropriate horsepower and type of motor for your electric band sawmill.
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A 10 HP single-phase motor may cause power fluctuations
The horsepower required for an electric band sawmill depends on various factors, including the size of logs and the desired speed of cutting. For instance, a sawmill with a 30-inch log capacity can function with a 13 HP engine, but upgrading to a 20 HP engine can speed up the cutting process. Another user with a similar log capacity mentioned using a 25 HP Kohler V-twin engine.
When it comes to electric motors, a single-phase motor is a two-wire alternating current power circuit that uses a single-phase power supply to convert electric energy into mechanical energy. Single-phase motors are commonly used for equipment that requires lower horsepower, such as air conditioners, automatic doors, small power tools, fans, pumps, and refrigerators. They are advantageous because they use less power to function. However, they may experience power fluctuations, as seen in the voltage rate of a single-phase motor, which can lead to reduced consistency in the power supply.
To mitigate the potential for power fluctuations with a 10 HP single-phase motor, one solution is to use a permanent-split capacitor motor. This type of motor has two windings spaced 90 degrees electrical apart and fed with two phases of current displaced 90 degrees in time. By keeping the capacitor (impedance) small, the losses can be minimized, reducing the impact of power fluctuations.
It is worth noting that a three-phase motor is an alternative option that can provide more stable power transmission. Three-phase motors generate a rotating magnetic field, making them self-starting and more efficient in transmitting a high volume of electricity over a large area. They are commonly used in industrial applications and are known for their durability and cost-effectiveness. However, they may not always be feasible, especially in residential or office settings, where single-phase power supplies are more common.
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Frequently asked questions
The ideal horsepower for an electric band sawmill depends on the intended use. For example, a 13 HP motor is sufficient for sawing 18" hard maple, but more power may be needed for larger logs. A 10 HP electric motor is also an option, but it may cause flicker on your power circuit.
Electric motors typically perform more work than a gasoline engine at a given horsepower because they have constant torque. Electric motors also eliminate clutching, noise, and vibration issues associated with gasoline engines.
A 13 HP Honda motor is considered the best small gas motor. It has good power, is quiet, fuel-efficient, and easy to start.
Several factors determine the necessary horsepower for a band sawmill, including bite, cant face width, saw kerf, saw speed, wood type, tooth style, and saw feed rate.
