Curtain Gear + Gearbox v2
Obliczymy ostateczną cenę na podstawie wybranego pliku. Sprawdzisz ją i zaakceptujesz przed płatnością.
Zapisane na tym urządzeniu.
Enhancement on my previous Curtain Gear project. It's better but still not working.
- Ocena
- 5 / 5
- Polubienia
- 11
- Pobrania
- 45
- Wydruki
- 1
- Wyświetlenia
- 927
- Oceny
- 1
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Mechanical Parts
- Licencja
- Creative Commons — Attribution — Share Alike
Enhancement on my previous Curtain Gear project due to multiple shortcomings, using the carrier (planet fixer) to drive the output with a higher torque, and having the ring fixed against the NEMA17 motor. Modify the source file if you have different dimensions.
Warning
Significant tweaking is still required on this model! I've given up on trying to make it work due to some friction, gearing, shearing, and tolerance problems. Said problems have significantly decreased the output torque, or have made the mechanism unstable. So I've decided to buy a metal gearbox for NEMA17 from StepperOnline and save myself the headache from hereon in.
Dimensional Information
Curtain Cord
OEM, 4mm diameter balls connected by 2mm of string
NEMA17 Motor
5mm D-shaft (0.5mm inset). With a 9mm long cylindrical shaft before the D chamfer begins. (L = 40mm). With my calipers, I've found that the depth of the M3 mounting holes are 5.5mm, but I've designed it around a 5mm depth.
Herringbone Gearbox
7:5:17 gearbox with the torque step-up of 2.4x. Backlash is minimal due to improved tolerance testing, both on the D-shaft and within the herringbone gears.
Curtain Gear
22 slots with 0.25mm tolerance. Gear radius of 21mm and outer diameter of 44mm. Which means it is barely larger than the profile of a NEMA17 motor (42.3mm wide).
Physics
- Input Torque (of NEMA17): [email protected]
- Radius of the Curtain Gear: 21mm
- Theoretical Angular Force Output (at 21mm): 55N
- Distance between the center point of the planets and the gearbox: 12.3mm
- The carrier moves at 7/24 the rate of the sun gear. (ie. ~686 steps per revolution.)
Changes on previous design
- Uses the Planet Carrier as output instead of the Ring, increasing the torque
- Removed the motor mount / carrier fixing hub
- Ring is now mounted directly on the NEMA17, reducing the size
- Fixed a bunch of tolerance issues
- Uses ball bearings now (since I'm using the planet carrier as the output)
Bill of Materials
- NEMA17 (1703HS168A) Stepper Motor x1
- 623-2RS Ball Bearing (ID3, OD10, H4) x6
- M3 35mm Screws x7
- M3 Nuts x6