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The Robits Launchers Expansion is a great way to increase your robot mechanism prowess by incorporating launcher-based concepts to your build. These are great examples of different launcher concepts that can help you understand the dynamics of projectile motion. While there are many launcher-based mechanisms common in robots, we’ve selected three that are good starting points to work from. This kit allows you to assemble one of three mechanisms at a time. What's next? Explore the change in dynamics by swapping the compliant wheels for flywheel-weighted stealth wheels. Try changing one of the many variables available to discover what make a good launching concept for the situation you desire.
Note: These are concepts and should be used as introductory examples to inform your design on projectile-based launchers.
FTC teams should be aware of R301 and R303 of the Competition Manual.
Concepts:
Catapult - This catapult concept uses stored energy and a cam to wind the arm back and rapidly release. Catapults are often very repeatable and are compatible with a variety of payloads. Changing variables such as cradle shape, arm length, elastic strength, and release angle can allow you to customize this concept for a wide range of launch dynamics.
Hooded Flywheel - This flywheel concept uses the rotational energy of the wheel to accelerate an object against a curved hood. Hooded flywheel systems often generate a rotational spin (top/backspin) on an object that can change how that object travels through the air. This concept is adjustable by varying wheel spacing, wheel type, and hood wrap angle.
Double Axle Flywheel - This flywheel concept uses a pair of wheels spinning in opposite directions to accelerate an object. Double axle flywheel systems oftentimes produce interesting dynamics to objects as they pass through the system. Wheels spinning at the same rate can prevent objects from spinning/curving through the air while varying the rate can cause different spin and trajectory changes. This concept is adjustable by varying wheel spacing, type, and velocity.
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Included Items:
- 5 - Screw, SHCS 10-32 x 1/2" (am-1002)
- 10 - Screw, SHCS 10-32 x 1-1/2" (am-1014)
- 5 - 10-32 x 2.5 in. SHCS (am-1024)
- 15 - Washer, #10 Steel (am-1026)
- 20 - 10-32 x 1.25 in. SHCS (am-1041)
- 10 - 10-32 x 3/4 in. Long Socket Head Cap Screw (am-1047)
- 5 - Screw, SHCS 10-32 x 1-3/4" (am-1048)
- 20 - 10-32 x 1 in. Socket Head Cap Screw (am-1056)
- 30 - 10-32 Nylock Jam Nut (am-1063)
- 24 - 10-24 x 0.75 in. Thread Forming Screw Hex Washer Head (am-1123)
- 5 - 10-32 x 2.250 in. Socket Head Cap Screw (am-1156)
- 10 - M3-0.5 x 8mm Socket Head Cap Screw with Thread Patch (am-1500)
- 100 - Cable Tie, 4", 18lb tensile, Black (am-1589_black)
- 4 - 3/8 in. Hex Collar Clamp HD 1 part (am-1637)
- 5 - 0.194 in. ID 0.375 in. OD 1.000 in. Long Nylon Spacer (am-1696)
- 10 - 0.194 in. ID 0.375 in. OD 0.500 in. Long Nylon Spacer (am-1697)
- 5 - 0.430 in. ID 0.500 in. OD 0.250 in. Long Aluminum Spacer (am-1698)
- 15 - 0.430 in. ID 0.500 in. OD 0.500 in. Long Aluminum Spacer (am-1699)
- 5 - 0.194 in. ID 0.375 in. OD 0.250 in. Long Nylon Spacer (am-1700)
- 2 - 10-32 Threaded 1 in. Long 0.375 in. Dia. Standoff (am-1701)
- 2 - 10-32 Threaded 2 in. Long 0.375 in. Dia. Standoff (am-1702)
- 4 - 10-32 Threaded 4 in. Long 0.375 in. Dia. Standoff (am-1704)
- 5 - hardware >Spacer, 0.375 OD x 0.194 ID x 0.125 Long Nylon (am-1732)
- 5 - 0.430 in. ID 0.500 in. OD 0.125 in. Long Aluminum Spacer (am-1742)
- 2 - 12 inch Encoder Cable for NeveRest Hex Motors (am-3926b-1200)
- 4 - 3" Compliant Wheel 3/8" Hex Bore Green 35 Durometer (am-3946_green)
- 4 - 0.375 in Hex ID 7/8 in. OD Sealed Flanged Bearing (FR62RS-Hex) (am-4489)
- 4 - 3" Stealth Wheel 0.375 Hex Bore 35A Durometer Green (am-4718_green)
- 4 - Pulley Half, 14T HTD 375 Hex Bore (am-4960_half)
- 1 - 0.03 in. Thick 15.5 in. x 6 in. Perforated Polycarbonate Sheet (am-4964a)
- 1 - 4 in. x 0.5 in. x 0.5 in. Robits Tube (am-5001-0400)
- 2 - 6 in. x 0.5 in. x 0.5 in. Robits Tube (am-5001-0600)
- 2 - 8 in. x 0.5 in. x 0.5 in. Robits Tube (am-5001-0800)
- 4 - 12 in. x 0.5 in. x 0.5 in. Robits Tube (am-5001-1200)
- 2 - 14 in. x 0.5 in. x 0.5 in. Robits Tube (am-5001-1400)
- 2 - 8 in. x 1 in. x 1 in. Robits Tube (am-5002-0800)
- 1 - 4 in. Robits Hex Shaft (am-5003-0400)
- 2 - 8 in. Robits Hex Shaft (am-5003-0800)
- 1 - 10 in. Robits Hex Shaft (am-5003-1000)
- 2 - Robits 2x3 L Gusset (am-5004-2x3)
- 7 - Robits 3x3 Corner Gusset (am-5005_3x3)
- 2 - Robits 5x5 Corner Gusset (am-5005_5x5)
- 2 - Robits 7x9 Triangle Gusset (am-5007_7x9)
- 1 - Robits 1x4 Beam (am-5011_1x4)
- 2 - Robits 1x8 Beam (am-5011_1x8)
- 2 - Robits 1x12 Beam (am-5011_1x12)
- 1 - Robits 1x16 Beam (am-5011_1x16)
- 1 - Robits Motor Mount (am-5012)
- 2 - Robits Side Bushing Carrier (am-5013)
- 4 - Robits Gears 30T 20DP 375 Hex Bore (am-5020_30)
- 2 - Robits Single Motor Bearing Mount (am-5022)
- 50 - #33 Rubber Bands (am-5024_black)
- 1 - Robits Snail Cam, 5" (am-5046)
- 2 - Coupler, NeveRest 1:1 (am-5182)
- 3 - 12 in. JST-VH 2-pin Motor Extension Cable (am-5198-1200)
- 1 - Belt, Timing, HTD, 5mm Pitch, 9mm Wide, 93T, 465-5M-9 (am-5209_93T)
- 4 - 3IN Stealth Wheel Flywheel Plate (am-5436)
- 2 - NeveRest Hex Gearmotor, 3.7:1 with Encoder, 1" Shaft (am-5440)
- 1 - NeveRest Hex Gearmotor, 50.9:1 with Encoder, 1" Shaft (am-5443)
- 1 - Adhesive Backed Compliant Foam Rubber- 10FT (am-5611-10)
CAD Files
am-5659 Robits Catapult Example.STEP
am-5659 Robits Double Axle Flywheel Example.STEP
am-5659 Robits Hooded Flywheel Example.STEP
