Unit Conversion for Velmex Positioners
* Typical
UniSlide
model
(where
x
is
from
above
table):
MB4024xJ-S4
Example
#1:
To
move
3.000
inches
with
the
BiSlide
E04
lead
screw
(3.000
÷
0.001
=
3,000)
requires
a
3,000
step
index.
Example
#2:
To
move
90
degrees
with
the
B5990
rotary
table
(90
÷
0.01
=
9,000)
requires
a
9,000
step
index.
Example
#3:
To
move
4.000
inches
with
the
UniSlide
W1
lead
screw
(4.000
÷
0.00025
=
16,000)
requires
a
16,000
step
index.
Other formulas:
1
Motor
rev
=
400
steps
Linear
Speed
=
Advance
per
step
x
steps
per
second
Rotary
Speed
=
Advance
per
step
x
steps
per
second
Steps
per
second
÷
400
=
rev/sec
**
Typical
BiSlide
model
(where
x
is
from
above
table):
MN10-0100-x-21
To convert from "real" units to steps, divide the distance desired to move by the
Advance per step. (Distance ÷
Adv per step = Steps)
11
The
VXM
uses
step
units
for
Index
and
Speed
parameters.
One
step
is
1/400
of
a
motor
revolution.
Step
units
for
distance
are
used
with
the
Index
commands
(”
I”
command.)
Speed
is
in
units
of
Steps/
Second
(SPS.)
Steps/
Second
units
for
speed
are
used
with
the
Speed
commands
(”
S
”
command.)
Acceleration
commands
(”
A
”
command)
are
values
from
1
to
127
that
are
relative
to
steps/sec
units.
Refer
to
Application
Note
#106
for
more
information
about
acceleration
units
and
move
profiles.
2
Direction
is
relative
to
the
device
the
motor
is
used
on.
On
screw
drive
actuators
like
UniSlides
and
BiSlides,
positive
is
the
direction
moving
away
from
the
motor.
On
worm
gear
type
rotary
tables
like
the
Velmex
B4800
or
B5990,
positive
is
counter
clockwise
(CCW.)
To
reorient
directions
refer
to
the
“
setDM
”
command
in
Appendix
O.
Units & Directions
Positive
®
Positive
CCW
Positive
CW
Worm
Gear
Rotary
Table
Screw
Drive
Actuator
Motor
Lead Screw Models
UniSlide*
BiSlide**
Advance per turn
Advance per step
Speed
@ 1000 SPS (2.5 rev/sec)
Units
Units
C
P40
E25
0.025
inch
0.0000625
inch
Units
0.0625
inch/sec
B
P20
E50
0.0001250
inch
W1
P10
E01
0.0002500
inch
W2
P5
E02
0.0005000
inch
W4
P2.5
E04
0.05
inch
0.1
inch
0.2
inch
0.4
inch
0.0010000
inch
0.125
inch/sec
0.25
inch/sec
0.5
inch/sec
1
inch/sec
K1
Q1
M01
1
mm
0.0025
mm
2.5
mm/sec
K2
Q2
M02
2
mm
0.0050
mm
5
mm/sec
Rotary Tables
Gear
Ratio
B4872
72:1
5
degree
0.0125
degree
12.5
degree/sec
B4836
36:1
10
degree
0.0250
degree
25
degree/sec
B4818
18:1
20
degree
0.0500
degree
50
degree/sec
B5990
90:1
4
degree
0.0100
degree
10
degree/sec
