Difference between revisions of "Pulses per Microliter"
| Line 14: | Line 14: | ||
The drive screw has a pitch of 18 threads per inch, or 1.411 mm per revolution. | The drive screw has a pitch of 18 threads per inch, or 1.411 mm per revolution. | ||
So... | So... | ||
| Line 26: | Line 24: | ||
Therefore, 86,400 pulses = 317.8 µL, or ~ 272 pulese/µL. | Therefore, 86,400 pulses = 317.8 µL, or ~ 272 pulese/µL. | ||
{| border="1" class="wikitable" style="width: 85%; text-align: center;" | |||
|+ Flow Calculations for EMO and VOL with 27:1 Planetary Gear | |||
|- | |||
| rowspan="6" style="width: 30%" | [[File:EMO-25.png|300px|left|EMO-25]] | |||
|- | |||
| style="width: 70%" | '''Motor:''' 1/16th microstepping at 1.8 degrees per full step, or 3200 pulses (microsteps) per motor revolution. | |||
|- | |||
| '''Planetary Gear:''' 27:1 ratio, so 3200 pulses times 27 equals 86,400 pulses (microsteps) for one revolution of the output drive. | |||
|- | |||
| <br>'''Drive Screw:''' 1:1 ratio (direct drive), so 86,400 pulses for one revolution of the drive screw.<br> | |||
|- | |||
| <br>'''Reservoir:''' <br><br> | |||
|- | |||
|} | |||
Revision as of 14:48, 27 July 2020
This is to explain the various gearing on our different heads.
EMO and VOL
The EMO and VOL heads both have a 27:1 gear ratio.
360 degrees equals one revolution of the motor.
Each full step is 1.8 degrees, so 200 full steps per revolution of the extrusion motor.
With 1/16th microstepping, that means 3200 microsteps per revolution of the extrusion motor.
One revolution of the extrusion motor equals one revolution of the drive screw (direct connection).
The drive screw has a pitch of 18 threads per inch, or 1.411 mm per revolution.
So...
3200 pulses times 27 equals 86,400 pulses (or microsteps) on the motor will deliver one revolution of the drive shaft, which moves the plunger in 1.4 mm in the cylinder.
The cylinder has a diameter of 17 mm, so the cross sectional area is 227 mm^2.
One revolution then displaces 1.4 mm of 227 mm^2 cross section, or 317.8 mm^3, or 317.8 µL.
Therefore, 86,400 pulses = 317.8 µL, or ~ 272 pulese/µL.
 |
| Motor: 1/16th microstepping at 1.8 degrees per full step, or 3200 pulses (microsteps) per motor revolution. |
| Planetary Gear: 27:1 ratio, so 3200 pulses times 27 equals 86,400 pulses (microsteps) for one revolution of the output drive. |
Drive Screw: 1:1 ratio (direct drive), so 86,400 pulses for one revolution of the drive screw. |
Reservoir: |