Difference between revisions of "DEWBOT XIII Shooter"
MaiKangWei (talk | contribs) (→Shooter) |
MaiKangWei (talk | contribs) (→Shooter) |
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* 2 inch wide wheels provide more consistency than 1 inch wide | * 2 inch wide wheels provide more consistency than 1 inch wide | ||
* Printed guides expanding the ball contact area from narrow rails to >1/3<sup>rd</sup> circumference, thereby improving shooting consistency | * Printed guides expanding the ball contact area from narrow rails to >1/3<sup>rd</sup> circumference, thereby improving shooting consistency | ||
+ | |||
+ | Key design features: | ||
+ | * PID controlled wheel speed | ||
+ | * 3:1 reduction via 1-stage versaplanetary gearbox | ||
+ | * Up to (3) 775 Pro drive motors | ||
+ | |||
<gallery widths=250 heights=250 perrow=3> | <gallery widths=250 heights=250 perrow=3> | ||
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image:1640 2017 Shooter.png|Shooter with printed guides in place | image:1640 2017 Shooter.png|Shooter with printed guides in place | ||
image:DB13_shooter-5.jpg|6 inch flywheel | image:DB13_shooter-5.jpg|6 inch flywheel | ||
− | image:DB13_shooter-6.jpg|3-motor shooter gearbox | + | image:DB13_shooter-6.jpg|3-motor (750 Pro) shooter gearbox |
image:DB13_shooter-9.jpg|3-motor shooter w/ 6" flywheel in ''deux'' | image:DB13_shooter-9.jpg|3-motor shooter w/ 6" flywheel in ''deux'' | ||
</gallery> | </gallery> |
Revision as of 00:47, 9 May 2017
It had been the team's intention and strategy for DEWBOT XIII to be a high-performance shooter (together with good rear running capabilities and a fast, reliable climb). Alas, we did not accomplish the critical shooting goal. Our shooter was definitely middling. While very consistent in its shooting and capable of shooting consistently at up to 6 balls/s, feed issues limited us to an average 2.5 balls/s. In addition, while shooter elevation and wheel speed are adjustable,we had a limited number of pre-set shooting solutions and limited objective data on which to base such solutions.
The Shooter System comprises several interacting components:
- Shooter
- Feeder
- Ball Pickup
- Hopper
Contents
Shooter
The shooter is a basic single-wheel shooter. While simple, this mechanism went through an enormous amount of testing and development, including multiple prototypes, the last few being CNC-produced.
Some key learnings:
- A flywheel reduces the magnitude of speed reduction while shooting, but not recovery time
- More power reduces speed recovery time
- Holes in balls (fuel) interacting randomly with thin shooter rails randomly throw off ball trajectory
- 6 inch wheels provide more consistency than 4 inch
- 2 inch wide wheels provide more consistency than 1 inch wide
- Printed guides expanding the ball contact area from narrow rails to >1/3rd circumference, thereby improving shooting consistency
Key design features:
- PID controlled wheel speed
- 3:1 reduction via 1-stage versaplanetary gearbox
- Up to (3) 775 Pro drive motors