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VELMEX, Inc.
Lead Screw Translation

Lead Screw Translation

Product catalog summary

Overview: This document provides detailed specifications and calculations for the VXM motor controller used with Velmex linear and rotary products. It covers step calculations, direction, speed, and motor specifications for both 1.8° (200 step) and 0.9° (400 step) motors.

Specifications:

Linear Products: The document lists lead screw codes for BiSlide®, UniSlide®, and XSlide™ with corresponding advances per turn and per step, calculated speeds at 1000 steps per second (SPS), and revolutions per second (RPS).
Rotary Tables: Gear ratios and advances per turn and step are provided for models B4872, B4836, B4818, and B5990, with speeds calculated for the VXM.

Procedures:

Direction: For screw drive actuators, positive direction moves away from the motor. For rotary tables, positive is typically counter-clockwise.
Step Calculation: To convert real units to steps, divide the desired distance by the advance per step. Examples are provided for different lead screws and rotary tables.

Formulas:

Motor revolution calculations for both 1.8° and 0.9° motors.
Linear and rotary speed calculations based on advance per step and steps per second.
Conversion of pulses per second to motor revolutions per second.

Performance Metrics:

Linear distance calculations with stepper motors and Velmex lead screws are provided per minute and per second, with limits noted for the VXM controller.
Shortest advance increments are detailed for various lead screw pitches, with conversions to inches, millimeters, and microns per step.

Recommendations:

Consider system orientation, rigidity, friction, wear, and load for system step resolution.
Use of gear heads can reduce speed and increase resolution.
Vexta High Resolution 0.9° motors offer higher resolution when driven by the VXM.

Catalog excerpts

VXM® Calculation of Steps, Direction and Speed Lead Screw Code for Velmex Linear Products BiSlide® (with standard 1.8º (200 step) motor) Speed for the VXM 1000 SPS (steps / sec)* Lead Screw Pitch > Gear Ratio Velmex Rotary Tables *Calculated with a VXM half step control and a 1.8° (200 step) motor

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VXM® Calculation of Steps, Direction and Speed Lead Screw Code for Velmex Linear Products BiSlide® (with .9º (400 step) motor) Speed for the VXM 1000 SPS (steps / sec)** Lead Screw Pitch > Gear Ratio Velmex Rotary Tables **Calculated with a VXM half step control and a .9° (400 step) motor

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VXM® Calculation of Steps, Direction and Speed - Direction is relative to the device the motor is on. On screw drive actuators like UniSlides®, BiSlides® and XSlides™, positive is the direction moving away from the motor. - On worm gear type Rotary Tables like the Velmex B4800 or B5990, positive is normally counter clockwise (CCW.) To convert from “real” units to steps when using a 1.8°, divide the distanced desired to move by the Advance Per Step. (Distance / Advance per Step = Steps for the VXM) Example #1: To move 3 inches with the BiSlide E04 lead screw (3 ÷ 0.001 = 3,000) requires a 3,000...

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Linear Distance with Stepper Motors and Velmex Lead Screws (per minute) Velmex Lead Screw Code BiSlide® Step Motor Rate: in half Steps/Sec.

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Linear Distance with Stepper Motors and Velmex Lead Screws (per second) Velmex Lead Screw Code BiSlide® Step Motor Rate: in half Steps/Sec. · Calculated with VXM™ Motor Controller which operates at 400 half-steps per revolution · Standard motor resolution is 1.8º per full step or 0.9º per half-step with the VXM

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Shortest Advance with VXM and 1.8° (200 step) Step Motor The increment of a single half-step* is BiSlide® XSlide™ UniSlide® Lead Screw Pitch > · Calculated with VXM™ Motor Controller which operates at 400 half-steps per revolution · Standard motor resolution is 1.8º per full step or 0.9º per half-step with the VXM *System step resolution or smallest repeatable move is dependent on system orientation, rigidity, friction, wear and applied load. † Velmex also offers Vexta High Resolution 0.9° motors. When driven by the VXM, resolution is 800 steps/rev. This effectively doubles the resolution but...

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Lead Screw Translation

Lead Screw Translation

Catalog excerpts

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