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How do I choose a pulley and belt?
Picking the Perfect Pulleys | GrabCAD Tutorials
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Step 1: Intro
For BattleBots, we use timing belts and pulleys. There are a few factors to consider when choosing pulleys. Pulleys are defined by material, tooth style, number of teeth, and belt width. Choosing these parameters may seem complicated, but the most important thing is that the tooth style and belt width match for both pulleys. Also, metal pulleys are less likely to strip or break than plastic ones, but you may want to consider plastic due to their lower weight.
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Step 2: Where can I find pulleys?
Check out SDP-SI's website for pulleys.
There are many different types of pulleys on this website, but there are some that are better than others. For our project, pulleys that have one or two flanges are desirable. These flanges are rims of metal preventing the belts from coming off. Note that using pulleys with flanges does increase the overall radius.
There are two methods for securing pulleys to a shaft: set screws and Fairloc hubs. Fairloc hubs are much better and more secure for round shafts, while set screws are better for D shafts. If you are planning on attaching your pulley to your bearings directly (i.e. in a shell spinner), set screws will be better than pulley-driving your shell, while your motor pulley should be a Fairloc.
Only the HTD and MXL pulleys are made of metal, have double flanges, and Fairloc Hubs.
Quick side note: this vendor provides SolidWorks models for most of their parts. Please download the CAD files for your pulleys and add them to your final assembly. You may need to force your computer to open these files with SolidWorks by right clicking, selecting open with, and then finding SolidWorks.
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Step 3: Choosing Pulleys
You will be choosing two pulleys, one for you weapons motor and one for your weapon shaft.
Generally, it is advisable to gear down, or use a smaller pulley on your motor than your weapon. For your smaller pulley, it may not be a bad idea to choose the smallest available. However if you elect for a larger one, choose one smaller than the can of the weapons motor. For your larger pulley, make sure that your pulleys outermost radius is not greater than your weapons innermost radius. In other words, your pulley should be completely obscured by your weapon when looking from the side (along the shaft axis). This protects your belt and pulley from the weapon.
Remember that there are a finite number of pulley sizes, and only certain sizes exist. Generally, it is a good idea to choose the pulley that is actually slightly smaller than your desired radius.
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Step 4: Choosing a Belt
Once you have chosen the sizes for your pulleys, and made sure that all of the other specifications are similar, it is time to choose your belt. Since your pulleys will (most likely) not be the same size, figuring out the length of your belt can be difficult. Thankfully, there is an online calculator for this.
Link to 成钢
With this calculator, you input the specifications of your pulleys and a desired center distance. The calculator will come up with a real belt with a center distance greater than or equal to the one you inputted. It is worth trying to find belt that has the next smallest center distance as well, because it may be closer to your desired distance than the next largest. You should consider both belts and decide which makes the most sense for your design.
This website is convenient because they link the exact part for you to buy, and has SolidWorks files for the belt. Do not include these in your assembly. Due to their construction, they will not stretch around your virtual pulleys, making your assembly a mess. However, you should include them in your bill of materials for their weight and cost.
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Step 5: Common Problems
A common issue with belts and pulleys is how to tension them. If you build a system without some kind of tensioning mechanism, your system will rely on high tolerances, and you will not it will be difficult to construct. In a properly constructed system, you can attach the belt when at least one, but ideally both, pulleys are attached. This means slipping the belt over the pulley flanges. After the belt is attached, it is somehow pulled taut or tensioned. There are two principal ways to do this: applying pressure to the outside of the belt, and applying pressure to the outside of the belt and applying pressure to the inside of the belt. The latter method is more suitable to our application. This involves creating a mechanism for moving the entire motor back and forth, while still assuring the motor will not move when running.
More details on this issue to be added later...
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Step 6: Quick Recap
TLDR; the steps above outline how to pick out two pulleys and a belt as a means of driving your bot's weapon motor system. Here are some of the important links included in this tutorial:
Pulley Vendor: https://www.sdp-si.com/products/Timing-Belt-Pulleys/index.php
Online Belt Calculator: https://www.bbman.com/belt-length-calculator/
A quick, but detailed tutorial on how to choose timing belts and pulleys for your bot. Written by Jacob Greenwood, the other technical lead of ASME at UCLA's BattleBots program.
Getting it Right: How to Choose the Perfect Belt for Your ...
Pulleys are an essential component in many mechanical systems, and they rely on belts to transmit power from the driving pulley to the driven pulley. The right belt on pulley ensures that power is transmitted efficiently and reliably. Choosing the right belt for a pulley system can be a daunting task, but it is essential to avoid premature failure and ensure optimal performance.
Here are some guidelines to help you choose the right belt for your pulley system:
- Determine the type of pulley: The first step in choosing the right belt for your pulley is to identify the type of pulley. There are different types of pulleys such as V-belt, timing belt, and flat belt pulleys, and each requires a different type of belt. It is important to select the correct type of belt for your pulley to ensure that it can handle the load and speed requirements.
- Measure the pulley: Once you have identified the type of pulley, the next step is to measure the pulleys dimensions accurately. The pulleys pitch diameter, groove width, and groove depth are critical dimensions that must be measured to ensure the right belt fit. You can use a caliper or a measuring tape to get accurate measurements.
- Calculate the belt length: Once you have measured the pulley dimensions, you can calculate the belt length required for your application. The belt length calculation is a critical step in selecting the right belt for your pulley system. The length of the belt must be such that it provides adequate tension to prevent slippage and ensure that power is transmitted efficiently.
- Determine the belt type: The next step is to determine the type of belt needed for your application. Belts come in different materials such as rubber, polyurethane, and neoprene. The type of belt you choose depends on the load, speed, and environmental conditions of your application. For example, polyurethane belts are best suited for high-speed applications, while rubber belts are ideal for applications that require flexibility.
- Consider the belt width: The width of the belt is also an essential factor to consider when selecting the right belt for your pulley system. The width of the belt must match the pulleys groove width to ensure optimal performance. A belt that is too narrow will cause excessive wear, while a belt that is too wide will not fit into the pulley groove.
- Choose the right manufacturer: Choosing the right manufacturer is also essential when selecting the right belt for your pulley system. A reputable manufacturer will provide high-quality belts that are designed to handle the load and speed requirements of your application. Always select a manufacturer that has a proven track record of producing reliable belts.
In conclusion, selecting the right belt for your pulley system is essential to ensure that power is transmitted efficiently and reliably. By following the guidelines above, you can choose the right belt for your application and avoid premature failure. Always remember to measure accurately, calculate the belt length, choose the right belt type, consider the belt width, and choose a reputable manufacturer.
Contact us to discuss your requirements of Pulley for Conveyor Belts. Our experienced sales team can help you identify the options that best suit your needs.
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