# Difference between revisions of "Pulses per Microliter"

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This page will explain the various gearing on our different heads, and how we determine a baseline pulses per microliter value. | This page will explain the various gearing on our different heads, and how we determine a baseline pulses per microliter value. | ||

+ | |||

+ | Please note, these values are for Repetrel software and firmware family release version 4 and newer. These are NOT the right numbers for older versions. | ||

== The 27:1 EMO and VOL == | == The 27:1 EMO and VOL == | ||

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{| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | {| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | ||

− | |+ Flow Calculations for the 27:1 EMO and VOL Heads | + | |+ v4 Flow Calculations for the 27:1 EMO and VOL Heads |

|- | |- | ||

| colspan="6" | [[File:EMO-horizontal.png|500px]] | | colspan="6" | [[File:EMO-horizontal.png|500px]] | ||

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{| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | {| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | ||

− | |+ Flow Calculations for the 100:1 EMO-XT, KR2, and TAM Heads | + | |+ v4 Flow Calculations for the 100:1 EMO-XT, KR2, and TAM Heads |

|- | |- | ||

| colspan="6" | [[File:100-1_horiz.png|500px]] | | colspan="6" | [[File:100-1_horiz.png|500px]] | ||

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* A 1.8° stepping motor; | * A 1.8° stepping motor; | ||

** Running in 1/16th microstep mode; | ** Running in 1/16th microstep mode; | ||

− | * And a hobbed (toothed) shaft with an effective | + | * And a hobbed (toothed) shaft with an effective diameter (due to hob depth) of 5 mm. |

The table below explains how a certain number of pulses (or microsteps) on the motor will generate a certain linear advancement of filament. | The table below explains how a certain number of pulses (or microsteps) on the motor will generate a certain linear advancement of filament. | ||

{| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | {| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | ||

− | |+ Flow Calculations for the MK1-250 Head | + | |+ v4 Flow Calculations for the MK1-250 Head |

|- | |- | ||

− | | colspan=" | + | | colspan="3" | [[File:Mk1-250_noplate.jpg|390px]] [[File:Mk1-250_suckhole.jpg|390px]] |

− | |||

|- | |- | ||

! Component | ! Component | ||

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|- | |- | ||

! Image | ! Image | ||

− | | [[File: | + | | [[File:Mk1-250_noplate_ctrzoom_left.jpg]] |

− | | [[File: | + | | [[File:Mk1-250_noplate_ctrzoom_right.jpg]] |

|- | |- | ||

! Details | ! Details | ||

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1 pulse is a 1/16th microstep, <br> so 3200 pulses = 1 motor rev. | 1 pulse is a 1/16th microstep, <br> so 3200 pulses = 1 motor rev. | ||

| The hobs on the motor shaft have an effective diameter 5 mm, <br> so using 2πr (or πØ) gives us an effective circumference of 15.7. | | The hobs on the motor shaft have an effective diameter 5 mm, <br> so using 2πr (or πØ) gives us an effective circumference of 15.7. | ||

− | That means one motor rev gives us | + | That means one motor rev gives us 15.7 mm of linear filament advance. |

|- | |- | ||

! 1 Rev <br> Calc. | ! 1 Rev <br> Calc. | ||

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Experimentation during 2020 has produced average results of 84.5 pulses/μL for ABS at 240 °C and 1800 mm/min.''' | Experimentation during 2020 has produced average results of 84.5 pulses/μL for ABS at 240 °C and 1800 mm/min.''' | ||

+ | |- | ||

+ | |} | ||

+ | |||

+ | == The HT1 heads == | ||

+ | |||

+ | The HT1-250 and HT1-450 heads have: | ||

+ | |||

+ | * A 1.8° stepping motor; | ||

+ | ** Running in 1/16th microstep mode; | ||

+ | * (gearbox ratio) | ||

+ | * (effective diameter) | ||

+ | |||

+ | The table below explains how a certain number of pulses (or microsteps) on the motor will generate a certain linear advancement of filament. | ||

+ | |||

+ | {| border="1" class="wikitable" style="text-align: center;" cellpadding="0" | ||

+ | |+ v4 Flow Calculations for the HT1-250 and HT1-450 Heads | ||

+ | |- | ||

+ | | colspan="4" | [[img]] [[img]] | ||

+ | |- | ||

+ | ! Component | ||

+ | ! Motor | ||

+ | ! Gearing | ||

+ | ! Drive | ||

+ | |- | ||

+ | ! Image | ||

+ | | [[img]] | ||

+ | | [[img]] | ||

+ | | [[img]] | ||

+ | |- | ||

+ | ! Details | ||

+ | | NEMA 17, 1.8° stepping motor, <br> so 200 full steps = 1 revolution. | ||

+ | 1 pulse is a 1/16th microstep, <br> so 3200 pulses = 1 motor rev. | ||

+ | | Gearing | ||

+ | | Drive | ||

+ | |- | ||

+ | ! 1 Rev <br> Calc. | ||

+ | | math | ||

+ | | more math | ||

+ | | more math | ||

+ | |- | ||

+ | ! And so: | ||

+ | ! colspan="3" | '''xxxx pulses = xxxx μL, or a theoretical xxxx pulses/μL. | ||

+ | |||

+ | Experimentation during 2020 has produced average results of xxxx pulses/μL for ABS at 240 °C and 1800 mm/min.''' | ||

|- | |- | ||

|} | |} |

## Revision as of 17:20, 31 July 2020

This page will explain the various gearing on our different heads, and how we determine a baseline pulses per microliter value.

Please note, these values are for Repetrel software and firmware family release version 4 and newer. These are NOT the right numbers for older versions.

## The 27:1 EMO and VOL

The EMO and VOL heads each have:

- A 1.8° stepping motor;
- Running in 1/16th microstep mode;

- A 27:1 planetary gear;
- A 1:1 drive screw coupling;
- A drive screw with a pitch of 18 threads per inch, or 1.411 thread per mm;
- And a reservoir with a 17 mm diameter, or 227 mm
^{2}cross section.

The table below explains how a certain number of pulses (or microsteps) on the motor will generate a certain volume displacement in the reservoir - the pulses/µL (or pulses/mm^{3}) number that we need to control the material advance or displacement. Note that factors like viscosity, compressibility, and nozzle characteristics will introduce some delay from the time of displacement to the time of actual extrusion.

## The 100:1 EMO-XT, KR2, and TAM

The EMO-XT, KR2, and TAM heads each have:

- A 1.8° stepping motor;
- Running in 1/16th microstep mode;

- A 1001 planetary gear;
- A 1:1 drive screw coupling;
- A drive screw with a pitch of 1 thread per mm;
- And a reservoir with a 17.6 mm diameter, or 240 mm
^{2}cross section.

The table below explains how a certain number of pulses (or microsteps) on the motor will generate a certain volume displacement in the reservoir - the pulses/µL (or pulses/mm^{3}) number that we need to control the material advance or displacement. Note that factors like viscosity, compressibility, and nozzle characteristics will introduce some delay from the time of displacement to the time of actual extrusion.

## The MK1-250

The MK1-250 heads have:

- A 1.8° stepping motor;
- Running in 1/16th microstep mode;

- And a hobbed (toothed) shaft with an effective diameter (due to hob depth) of 5 mm.

## The HT1 heads

The HT1-250 and HT1-450 heads have:

- A 1.8° stepping motor;
- Running in 1/16th microstep mode;

- (gearbox ratio)
- (effective diameter)

img img | |||

Component | Motor | Gearing | Drive |
---|---|---|---|

Image | img | img | img |

Details | NEMA 17, 1.8° stepping motor, so 200 full steps = 1 revolution. 1 pulse is a 1/16th microstep, |
Gearing | Drive |

1 Rev Calc. |
math | more math | more math |

And so: | xxxx pulses = xxxx μL, or a theoretical xxxx pulses/μL.
Experimentation during 2020 has produced average results of xxxx pulses/μL for ABS at 240 °C and 1800 mm/min. |