RC08-Dribbler
This page contains the information and documentation of the 2008 dribbler system
Contents
Assembly Structure
Parts & Components
Motor
Vendor: MicroMo
- Motor: 12V DC brushless servo motor #E-1628B
- $147.10 each
- Planetary gearhead: #E-167 gear reduction: 14
- Complete assembly 1628-V-0003
Cost: $200.40 each
- Electrical specification
- 12 Volts
- must have position or speed encoders
- brushless DC
Gears
Motor gear
Vendor: SDP/SI Part No.: A 1B 2MYK05030H Description: 3mm bore, 30 teeth, 15mm pitch diameter, brass gear with set screw Cost: $6.72 Drawing:Motor Gear Spec Sheet
- Connects directly to output of motor and powers dribbler roller
Roller gear
Vendor: SDP/SI Part No.: A 1B 2MYK08020 Description: 4mm bore, 20 teeth, 16mm pitch diameter, brass gear with set screw Cost: $9.12 Drawing:Dribbler Gear Spec Sheet
- Roller gear needs be turned down from 7mm face to 2mm face width
- Powers the dribbler roller - is recessed into the roller itself
Plates
Swing
Vendor: McMaster-Carr Part No.: 8885K13 Description: Alloy 7075 Aluminum Sheet .063" Thick, 12" X 12" Cost: $21.73
- Contains the roller shaft, the motor mounts, spacers, and hinge shafts
- Material is same and shared with Omniwheel plates
- Left and right swings are identical
Motor plate
Vendor: McMaster-Carr Part No.: 8885K13 Description: Alloy 7075 Aluminum Sheet .063" Thick, 12" X 12" Cost: $21.73
- Supports motor and connects to the 2 spacers in assembly
- Material is same and shared with Omniwheel plates
Spacers
Spacer1
Spacer2
Fasteners
Shaft
Hinge shaft
Dribbler shaft
Spring
Torsion spring
Other
4mm snap thrust bearing
Vendor: McMaster-Carr Part No.:7817K33 Description: Metric Nylon Snap-in Thrust Bearing for 4mm Shaft Dia, 1.45-2.34 mm Sheet Metal Thick Cost: $1.32
- supports dribbler shaft in the swing
Notes
- 4mm steel shaft chosen to increase strength to prevent bending of dribbler shaft when hit with a ball
- roller diameter - .5"
- dribbler shaft still slides free in between two snap-in thrust bearings and can be removed to allow the roller to be changed out
Dribbler bar prototypes
- shaft diameter on ends of bar - 3mm
- maximum diameter of dribbler - .75"
- the dribbler bar prototypes will be lathed and done coated with neoprene heat shrink
dribbler bar prototypes
- 3/4" diameter aluminum bar stock
- $8.34
- McMaster part number 6750K181
- 3mm diameter aluminum bar stock
- $6.94
- McMaster part number 1681T21
- 3/4" neoprene heat shrink
- pack of 5 for $8.97
- McMaster part number 7505K86
- 3mm e-clips
- pack of 100 for $3.03
- McMaster part number 98543A101
2007 Dribbler
Drive gear
- attached to the motor
- SDP/SI A-1B-2MYK05045 Data sheet
- 45 teeth, 3mm bore, 22.5mm pitch diameter
Dribbler gear
- attached to the roller. This is done by pressing having a set screw in the gear interfere with the roller. Both the gear and roller are free to spin on the shaft, which permitting easy change.
- SDP/SI A-1B-2MYKO5020H Data sheet
- 20 teeth, 3mm bore, 10mm pitch diameter
- gear ratio from motor to drilbber = 2.25
Motor
- 15.9mm diameter, 3mm output shaft
Specs from CMU
- Dribbler motor gear from SDP-SI: S10T05M042A0303 Module 0.5, 42 Teeth, 20° Pressure Angle , 2024 Aluminum alloy Gear
- Dribbler bar gear from SDP-SI: S10T05M028A0305 Module 0.5, 28 Teeth, 20° Pressure Angle , 2024 Aluminum alloy Gear
- spur gear reduction 1:1.5
- Dribbler Motor - Maxon
- 266521
- http://test.maxonmotor.com/docsx/Download/catalog_2007/Pdf/07_154_e.pdf
- nominal speed 28200 rpm
- Gearhead
- 118184 - Maxon
- http://test.maxonmotor.com/docsx/Download/catalog_2007/Pdf/07_215_e.pdf
- reduction 5.4:1
- nominal dribbler bar speed = 28200/5.4*1.5 = 7833 RPM. It is, of course, adjustable by software.
