Difference between revisions of "Pulses per Microliter"

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


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


* A 1.8° stepping motor;
* A 1.8° stepping motor;
** Running in 1/16th microstep mode;
** Running in 1/16th microstep mode;
* A 27:1 planetary gear;
* A 1001 planetary gear;
* A 1:1 drive screw coupling;
* A 1:1 drive screw coupling;
* A drive screw with a pitch of 18 threads per inch, or 1.411 thread per mm;
* A drive screw with a pitch of 1 thread per mm;
* And a reservoir with a 17 mm diameter, or 227 mm<sup>2</sup> cross section.
* And a reservoir with a 17 mm diameter, or 227 mm<sup>2</sup> cross section.


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

Revision as of 17:33, 27 July 2020

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

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 mm2 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/mm3) 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.

Flow Calculations for the 27:1 EMO and VOL Heads
Component Motor Gearing Coupling Drive Screw Reservoir
Image EH-motor.png EH-gear.png EH-coupling.png EH-screw.png EH-reservoir.png
Details This is a 1.8° stepping motor,
so 200 full steps = 1 revolution.

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

27:1 planetary gear,
so 27 motor revs
= 1 output rev.
1:1 direct coupling,
so no change
is introduced.
The drive screw has a pitch
of 18 threads per inch, or
1.411 mm linear travel
per revolution.
The reservoir has a diameter of 17 mm,
so the cross sectional area is 227 mm2.

Therefore, each revolution of the drive screw
displaces 1.411 x 227 or 317.8 mm3 (or 317.8 µL) of volume.

1 Rev
Calc.
86,400 pulses =
27 motor revs...
= 1 output rev... = 1 screw rev... = 1.411 mm linear advance... = 317.8 µL displacement.
And so: 86,400 pulses = 317.8 µL, or 271.9 pulses/µL

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 mm diameter, or 227 mm2 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/mm3) 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.

Flow Calculations for the 100:1 EMO-XT, KR2, and TAM Heads
Component Motor Gearing Coupling Drive Screw Reservoir
Image EH-motor.png EH-gear.png EH-coupling.png EH-screw.png EH-reservoir.png
Details This is a 1.8° stepping motor,
so 200 full steps = 1 revolution.

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

27:1 planetary gear,
so 27 motor revs
= 1 output rev.
1:1 direct coupling,
so no change
is introduced.
The drive screw has a pitch
of 18 threads per inch, or
1.411 mm linear travel
per revolution.
The reservoir has a diameter of 17 mm,
so the cross sectional area is 227 mm2.

Therefore, each revolution of the drive screw
displaces 1.411 x 227 or 317.8 mm3 (or 317.8 µL) of volume.

1 Rev
Calc.
86,400 pulses =
27 motor revs...
= 1 output rev... = 1 screw rev... = 1.411 mm linear advance... = 317.8 µL displacement.
And so: 86,400 pulses = 317.8 µL, or 271.9 pulses/µL