Swole Bar - 12lb Beater Bar
Initial Ideation and Sandbox CADing
To create the 12lb Beater Bar, we began by scaling up the original model by a factor of 1/3 to make it suitable for a 12 lb robot. We explored different hardware options that could replace the impactor teeth. We considered flathead screws ranging from 3/8" to 1/2" in size, and ultimately decided that 1/2" screws would be the best fit for our needs.
After scaling up the model, the size looked correct, but the bar did not have enough mass to be effective. To address this issue, we decided to change the bar material from aluminum to steel. This will not only increase the mass but also make the bar more durable in combat.
To ensure that the 12lb Beater Bar could be easily assembled, we adjusted the bearings and shaft to sizes that are commonly available off the shelf. After analyzing our options, we determined that a 1/2" shaft and needle bearings would be the best fit for our needs.
No time to waste, so off to manufacturing.
BoM
Beater Bar | 1 | 35.6 oz | $50.00 | 35.6 oz | $75.00 | |
Impactor Teeth | 4 | 1.0 oz | $0.76 | 4.0 oz | $3.02 | https://www.mcmaster.com/catalog/129/3422/91253A712 |
Impactor Split Washer | 4 | 0.2 oz | $0.22 | 0.9 oz | $0.90 | https://www.mcmaster.com/91104A033/ |
Needle Roller Bearing | 2 | 0.2 oz | $5.93 | 0.5 oz | $11.86 | https://www.mcmaster.com/5905K23/ |
Thrust Washer Bearing | 2 | 0.1 oz | $3.91 | 0.2 oz | $7.82 | https://www.mcmaster.com/5909K31/ |
Thrust Washer | 4 | 0.0 oz | $1.23 | 0.2 oz | $4.92 | https://www.mcmaster.com/5909K44/ |
Weapon Shaft | 1 | 8.0 oz | $9.06 | 8.0 oz | $9.06 | https://www.mcmaster.com/1346K512/ |
Shaft Collar | 2 | 0.4 oz | $4.32 | 0.9 oz | $8.64 | https://www.mcmaster.com/9946K15/ |
Pulley Screw #10-32 x 1.25" FHCS | 2 | 0.2 oz | $0.25 | 0.3 oz | $0.50 | https://www.mcmaster.com/91253A012/ |
2" 2L Pulley | 1 | 2.2 oz | $45.00 | 2.2 oz | $45.00 |
CAD Files
License
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