Week 4 Spring (2/5/18-2/11/18)

Disc Teflon and Cushion

The team put the Teflon on the disc to determine to limit the friction. The team determined that we need an adhesive (Velcro) to go under the Teflon to hold to the Teflon in place. The team decided to order a thinner Teflon.

The figure above shows the cushion on top of the disc, however, the team determined that we need a thinner cushion ( 1 inch thick instead of 2 inch thick) due to the ridges change its height. 

Calculations for Torque

The team calculated the torque in order to determine which type of motor the disc will need to rotate without any issues. The team calculated 58.7 N*m

Items Ordered:

Thinner Teflon

Velcro

Cushion

Future task:

Use force meter item to measure torque with a 200 lbs on disc

Assemble properly the Teflon and cushion

Pressure Sensor Comparison

Motor Research and Findings

- the original motor had the following characteristics:

          Torque: 40 in-lbs or 4.52 Nm

          rpm: 12 rpm

- since the original motor was found to not be strong enough to be able to turn the disk while the disk is supporting a 200 lb individual, therefore the following motos were found in our research for a new motor with a high torque:

PN00113-VAR - Variable Speed High Torque 5 RPM Conveyor and Rotisserie Gear Motor 12V DC Reversible

link: https://makermotor.com/pn00113-var-variable-speed-high-torque-5-rpm-conveyor-and-rotisserie-gear-motor-12v-dc-reversible/

          torque: 91.7 Nm

          rpm: 5 rpm

          price: $205

40 RPM 12 Volt DC 600 Watt RA Gearmotor

link: http://www.surpluscenter.com/Electric-Motors/DC-Gearmotors/DC-Gearmotors/40-RPM-12-Volt-DC-600-Watt-RA-Gearmotor-5-1719.axd

          torque: 94.5 Nm

          rpm: 40 rpm

          price: $184.95

40 RPM 12 Volt DC 900 Watt RA Gearmotor

link: http://www.surpluscenter.com/Brands/Buyers-Products/40-RPM-12-Volt-DC-900-Watt-RA-Gearmotor-5-1720.axd

          torque: 213.5 Nm

          rpm: 40 rpm

          price: $199.95