Instruction material for how do you calculate torques / speeds from gearboxes and how to read torque vs speed graphs as well as power draw of the motor vs speed / torque. Also need to have the practical aspect that often gearboxes only come off-the-shelf in certain gear ratios. you could design your own, but that would be really expensive / time consuming.
Lab portion would give the students a problem such as to define a gearbox design given standard components to be able to hold up a XX lb weight horizontally if it is hanging from a YY arm.
Part 2 of the lab would be same question, but to hold the arm at a 45 degree angle up.
Part 3 would be to hold the arm at a 45 degree angle down.
Part 4 would be to hold the arm strait up and straight down.
A brief discussion is expected to accompany each question.
After the lab, then add additional discussion about why designing to the limit is often the minimum requirement and a bad idea... usually you would want to have performance margins of safety which vary by application. For instance, in aerospace, margins of safety are sometimes 0.7 to 1.2 of max expected load (safety factors cost weight and performance), whereas in civil engineering where weight is not as much of a concern, safety factors can be 5x or 10x the max expected load. Some common safety factors for cables lifting loads overhead are, for instance 5x ultimate load of the cable... i.e., a construction cable which is rated to hold 10,000 lbs has likely been tested up to at least 50,000 lb and it's design has been tested to failure to higher loads. These safety margins are there to protect people from having stuff fall on them... but maybe this discussion is all another lab as well.
Reach out to Richard or Deputies to help design this.
Instruction material for how do you calculate torques / speeds from gearboxes and how to read torque vs speed graphs as well as power draw of the motor vs speed / torque. Also need to have the practical aspect that often gearboxes only come off-the-shelf in certain gear ratios. you could design your own, but that would be really expensive / time consuming.
Lab portion would give the students a problem such as to define a gearbox design given standard components to be able to hold up a XX lb weight horizontally if it is hanging from a YY arm.
Part 2 of the lab would be same question, but to hold the arm at a 45 degree angle up.
Part 3 would be to hold the arm at a 45 degree angle down.
Part 4 would be to hold the arm strait up and straight down.
A brief discussion is expected to accompany each question.
After the lab, then add additional discussion about why designing to the limit is often the minimum requirement and a bad idea... usually you would want to have performance margins of safety which vary by application. For instance, in aerospace, margins of safety are sometimes 0.7 to 1.2 of max expected load (safety factors cost weight and performance), whereas in civil engineering where weight is not as much of a concern, safety factors can be 5x or 10x the max expected load. Some common safety factors for cables lifting loads overhead are, for instance 5x ultimate load of the cable... i.e., a construction cable which is rated to hold 10,000 lbs has likely been tested up to at least 50,000 lb and it's design has been tested to failure to higher loads. These safety margins are there to protect people from having stuff fall on them... but maybe this discussion is all another lab as well.
Reach out to Richard or Deputies to help design this.