3D Printed Planetary Gear for a Stepper Motor: Difference between revisions
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*May need to increase cover plate and double up shaft bearing to address radial thrust in filament drive application. | *May need to increase cover plate and double up shaft bearing to address radial thrust in filament drive application. | ||
*Easy fix, outside of getting bolt lengths correct. | *Easy fix, outside of getting bolt lengths correct. | ||
* | *Disadvantage - there will.be wear as axial thrust is not addressed without herringbone design. | ||
=Why?= | =Why?= | ||
*Note that he4ingbone gears eliminate the need for a thrust bearing. That is a great point of size.plification when using planetary gears. | *Note that he4ingbone gears eliminate the need for a thrust bearing. That is a great point of size.plification when using planetary gears. | ||
*"Here is a design for a low-profile (18mm) stackable gearbox that fits onto a standard NEMA 17 stepper motor. The gearing ratio of 4:1 allows for increased torque and positional accuracy from the motor. Herringbone gears are used to provide smooth power transmission from the stepper motor while eliminating the need for thrust bearings. A flat rotating output platform is also provided to allow for easy mounting of attachments. More details along with a step-by-step guide to designing gears for 3D printing in Autodesk Inventor is provided below." | *"Here is a design for a low-profile (18mm) stackable gearbox that fits onto a standard NEMA 17 stepper motor. The gearing ratio of 4:1 allows for increased torque and positional accuracy from the motor. Herringbone gears are used to provide smooth power transmission from the stepper motor while eliminating the need for thrust bearings. A flat rotating output platform is also provided to allow for easy mounting of attachments. More details along with a step-by-step guide to designing gears for 3D printing in Autodesk Inventor is provided below." | ||
Revision as of 18:50, 24 March 2019
Herringbone Version
- Source with great explanation of planetary gears - [1]
- In this example, bearings should be added to planet gears to make the output shaft not wear out
- Thus, this is not a turnkey solution for practical applications. Design must be modified.
- This design appears to be completely stackable. 4x per stage gets you good geardown. Successive stages should be enlarged to handle higher torque.
- This is good for a geared down extruder for 3 mm filament.
- This may be applicable to vehicle geardown with rubber-on-plastic drive for heavy duty applications up to 1000 lb drive for solar slow traction vehicles
Straight Gear Version
- This one has bearings, so it appears to be usable as is. No herringbone gears, though. - [2]
- May need to increase cover plate and double up shaft bearing to address radial thrust in filament drive application.
- Easy fix, outside of getting bolt lengths correct.
- Disadvantage - there will.be wear as axial thrust is not addressed without herringbone design.
Why?
- Note that he4ingbone gears eliminate the need for a thrust bearing. That is a great point of size.plification when using planetary gears.
- "Here is a design for a low-profile (18mm) stackable gearbox that fits onto a standard NEMA 17 stepper motor. The gearing ratio of 4:1 allows for increased torque and positional accuracy from the motor. Herringbone gears are used to provide smooth power transmission from the stepper motor while eliminating the need for thrust bearings. A flat rotating output platform is also provided to allow for easy mounting of attachments. More details along with a step-by-step guide to designing gears for 3D printing in Autodesk Inventor is provided below."