Unit confusion; RPM and Strokes per minute.

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SUMMARY

The discussion centers on the relationship between RPM (Revolutions Per Minute) and SPM (Strokes Per Minute) in the context of a reciprocating saw. The user seeks to understand if angular velocity can be derived from strokes per minute, specifically for a Makita BJR181RFE3 model. It is confirmed that while RPM and SPM are related, they are not inherently the same due to the mechanical conversion involved in the saw's operation, which includes gearing mechanisms that affect the output motion.

PREREQUISITES
  • Understanding of basic physics concepts such as power, torque, and angular velocity.
  • Familiarity with reciprocating saw mechanics and operation.
  • Knowledge of gear ratios and their impact on rotational motion.
  • Ability to interpret technical diagrams and exploded views of machinery.
NEXT STEPS
  • Research the mechanics of reciprocating saws, focusing on the conversion of rotational motion to linear motion.
  • Study gear ratio calculations and their effects on RPM and SPM.
  • Learn about power calculations in mechanical systems, specifically using the formula power = Torque x angular velocity.
  • Examine technical documentation for the Makita BJR181RFE3 to understand its specific gearing and performance characteristics.
USEFUL FOR

Engineers, mechanics, and DIY enthusiasts who are involved in power tool design, operation, or optimization, particularly those working with reciprocating saws and similar machinery.

TheRB4891
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I know power = Torque x angular velocity (rad/s) AND
I am wondering if angular velocity can be calculated through strokes per minute?

The product is a reciprocating saw (not orbital).

In this case are RPM's the same as SPM'S?

Thanks
 
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TheRB4891 said:
I know power = Torque x angular velocity (rad/s) AND
I am wondering if angular velocity can be calculated through strokes per minute?

The product is a reciprocating saw (not orbital).

In this case are RPM's the same as SPM'S?

Thanks

Welcome to the PF.

Do you know what the mechanism looks like to convert the spinning motor shaft into the reciprocating motion of the saw blade? Is there any gearing involved?
 
I must plead "noob" on this subject if I'm honest, i mean yes there is gearing but i don't have the ratio's, this is the exploded view of the saw i am analysing.

http://www.makitauk.com/shop/parts/partdrawings.asp?groupid=2125&model=BJR181RFE3&fromItemInfo=1
 

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