How to calculate the required specifications of a motor?

AI Thread Summary
To calculate the required specifications of a motor for a reciprocating rack and pinion cutter, it's essential to determine the cutting power, which is the product of cutting torque and cutting RPM. The discussion highlights the importance of understanding the limitations of using plywood as a construction material, including fatigue and failure rates. It suggests developing a hypothetical plan with defined design limits and considering the types of cutting tools and materials suitable for a reciprocating drive. Additionally, the conversation emphasizes that calculating motor specifications based solely on mass and velocity may not be the best approach to machine design. Overall, careful planning and consideration of design constraints are crucial for successful implementation.
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I am planning to design a reciprocating rack and pinion, as shown in this figure
reciprocating-rack-and-pinion.gif

I plan to attach a cutter to this setup to cut anything.I need to know how to calculate the motor specifications for the given mass of the gear, cutter and cutter velocity
maxresdefault.jpg

I plan to make it with a plywood
 
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Basically, you need to know how much cutting power you need. It's equal to the cutting torque times the cutting rpm (in SI units).

There are some online information, mostly for metals though:
 
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"Cut anything," implies this is not a purpose built design so have you asked the right question? If so Jack Action has answered your question but the limit in machine design is the platform which you've chosen to be of plywood. What are the limits of your plywood design? Calculating for a motor based on the mass of the gear, cutter and cutter velocity seems to me to be an odd approach to machine design. Have you considered the fatigue and failure rates of plywood? What's the designed safety margin?

I read something here about homework and projects. If that's what this is I would suggest you begin by developing a hypothetical plan with design limits for the use of your machine. Your first limit is obvious and involves no calculations. What cutting tools can be used in a reciprocating drive and what materials can be cut with a reciprocating cutter? I assume the purpose of your design is to convert rotational motion into oscillating or reciprocal motion? For what it's worth these are just some thoughts and considerations for your design.
 
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