User:Powdermetal
Revision as of 15:13, 22 April 2016 by Powdermetal (talk | contribs)
Cycloidal Extruder Drive
Release status: Concept
Description | Gearbox for direct drive extruders, based on a cycloidal drive
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License | GPL
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Contents
Intro
Running a delta printer with a Bowden-style type extruder, many people have been looking into alternatives for a more direct filament feed response (especially when using flexible materials) while still keeping the dynamics of a lightweight effector system. There are a bunch of options out there and each one has it's specific strengths...
Project Target
- Use a small, lightweight and powerful NEMA8/NEMA11-stepper to drive a filament drive gear (like MK8 or others)
- Minimize gearbox package through choosing a cycloidal drive system (gearbox ratio probably between 36:1 and 10:1)
- Setup a potential alternative to the outphased NMB PG35L-048
v0.1
Objective
Quickly check general feasibility using some existing components:
- Pololu NEMA 8 Stepper Motor: Bipolar, 200 Steps/Rev, 20×30mm, 3.9V, 0.6 A/Phase, 180 g-cm
- StepperOnline Nema 8 Bipolar 0.6A 4Ncm(5.7oz.in) mini stepper motor 8HS15-0604S
- MK8 Drive Gear
- E3D v6 HotEnd - 3mm Direct (12v)
Design
- Gearbox ratio: Some simple engineering calculations based on required feed-forces for 3mm filament and comparisons with existing extruder solutions propose for the 4Ncm stepper a gearbox ratio of approx. 20:1. Having an existing CAD model of a cycloidal gearbox with a ratio of 36:1, this one was simply adopted.
BOM
Make & Assemble
Validate & Test
Results
Todo
v0.2
Objective
xxx