D3D v20.04.27 Calculations: Difference between revisions
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(Created page with "=Extruder Driver Calculations= *5 mm drive radius on drive means - about 20 lb drive *Measurements: about 10 lb before filament slips; motor does not skip before slipping, so...") |
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*5 mm drive radius on drive means - about 20 lb drive | *5 mm drive radius on drive means - about 20 lb drive | ||
*Measurements: about 10 lb before filament slips; motor does not skip before slipping, so tensioner is the limiting factor | *Measurements: about 10 lb before filament slips; motor does not skip before slipping, so tensioner is the limiting factor | ||
*Note push is very easy with full melt (from standing extruder upon startup). This implies, that under the limit of good heating, it is kinking of filament in 'mystery zone' that requires much of the push force. | |||
*Say teeth grab at 1 cubic mm of volume. 1/25^2 = 8 lb of 5000 psi filament. Thus, max push before stripping is about 10 lb. We have 2x that in the drive motor already. | |||
*Thus, geardown is calculated to not be needed, as we run into filament stripping limit. | |||
Revision as of 15:52, 5 May 2020
Extruder Driver Calculations
- 5 mm drive radius on drive means - about 20 lb drive
- Measurements: about 10 lb before filament slips; motor does not skip before slipping, so tensioner is the limiting factor
- Note push is very easy with full melt (from standing extruder upon startup). This implies, that under the limit of good heating, it is kinking of filament in 'mystery zone' that requires much of the push force.
- Say teeth grab at 1 cubic mm of volume. 1/25^2 = 8 lb of 5000 psi filament. Thus, max push before stripping is about 10 lb. We have 2x that in the drive motor already.
- Thus, geardown is calculated to not be needed, as we run into filament stripping limit.