Renishaw_LM10D17_02.pdf

Frezarka CNC - procedura bazowania maszyny

Wejdź sobie tu: http://content.heidenhain.de/presentation/elearning/PL/index/1271254389872/1271254389880/1271254389883/1271254389883.html i obejrzyj dokładnie 3 pokaz (prawy górny róg) o znacznikach referencyjnych na liniale Tam ich rozstaw jest 10 a na LS623 podejrzewam że to jest te 50 Tą blaszką najprawdopodobniej ustawiasz o który chodzi w konkretnym przypadku. Dodano po 7 : Wiesz może na czy polega punkt referencyjny jako "distance-coded"? Tak. Przeczytaj początek tego dokumentu:


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Data sheet
LM10D17_02
Issue 2, 12th April 2011

DCRM distance coded reference mark system

322

318

324

10

316

630

8

632

6 634

00

0,0

10

The distance coded reference
mark (DCRM) scale allows
a measuring system to reestablish absolute position
after traversing a short
travel. It represents a great
usage benefit especially
on long axis (several tens
of meters), in comparison
with conventional reference
marks, where re-establishing
of absolute position can
require traversing the entire
axis.

The distance coding is created by
having multiple reference marks
individually spaced according to
mathematical algorithm. Absolute
position is known after traversing 2
succesive reference marks.

?? Customer selectable basic
increment for optimal maximum
length selection
?? Compatible with standard RLS(R)
LM10, LM13 and LM15 readheads

?? Available for MS10 and MS15
Absolute position of 1st traversed
magnetic scales
reference mark is calculated in
?? Vertical / horizontal transport
controller electronics, based on relative
application
distance between 2 neighbouring
reference marks, direction of
movement, basic increment, and
magnetisation pole length. DCRM
is currently available with 2 mm and
5 mm pole lengths.

A

associate company

Data sheet
LM10D17_02

Glossary
Basic increment (K in mm) - Represents the distance in mm between odd reference marks; it determines the maximum
codable length over which the absolute position can be defined. It also determines the minimum distance which
needs to be traversed to capture 2 neighbouring reference marks. The basic distance should be divisible by the
length of 2 poles (in mm). K is customer selectable.
Maximum codable length (Lmax in mm) - Is the maximum length of the magnetic scale over which the DCRM feature
can be applied and still provide a unique absolute position. Lengths shorter than the maximum length can also be
used (see Table 1).
Pole lenght (P in mm) - Is the length of one magnetised pole (S or N). We currently offer magnetic scales with pole
lenghts 2 mm (MS10) and 5 mm (MS15).

Specification
The basic increment K (in mm) is chosen at the point of order and must be divisible by 2 × P with no remainder. K
determines:
?? Maximum codable length:


Where:

??
?
- 1? - 2P
Lmax = ? ?
? 2P ?

Lmax = Maximum codable length (in mm)
K = Basic increment (in mm)
P = Pole length (in mm)

?? Minimum distance along the measuring scale which needs to be traversed in order to calculate the absolute
position. The minimum travel distance equals the basic increment K - 2P.
The distribution of the reference marks is shown in figure 1. DCRMs are produced by additional magnetisation of the
magnetic tape.
Figure 1
K

K

MS10A/A-WWYY-BB-2000-NNN
K/2

K/2 + P

K/2 - P

K/2 +2P

K/2 - 2P
K+P

K+P
Lmax

Table 1
K (mm)

Maximum codable length
(mm)
P = 2 mm

P = 5 mm

20

76

40

356

60

836

80

1,516

100

2,396

890

200

9,796

3,790

300

22,196

8,690

400

39,596

15,590

500

61,996

24,490

600

89,396

35,390

700

48,290

800

63,190

900

80,090

1,000

2

K/2 + 3P

98,990

3P

K - 2P
K+P

K/2

(R)

How the absolute position is evaluated
The absolute position of the 1st traversed reference mark is calculated by the following formula:
abs × ?RI
?1
? K
RI1 = ? × abs ( 2 × ?RI - K ) - sgn ( 2 × ?RI - K ) - 1? × + [sgn( 2 × ?RI - K ) - sgn (D )] ×
2
?P
? 2

Where:

Variables:
RI1 =
?RI =
K
=
D
=
Operators:
abs =
sgn =

Absolute position of first traversed reference mark (in mm)
Distance between two successively traversed reference marks (in mm)
Basic increment between two fixed reference marks (in mm)
Direction of movement (+1 or -1)
Absolute value;
Sign function (+1 or -1)

Other considerations
Timing of reference mark capturing
The minimum distance between 2 succesive reference marks equals 3 × P. Subsequent electronics must be able
to capture position of 2 succesive reference marks under the maximum velocity condition. Minimum time at which
2 succesive reference marks appear is given by formula:


Where:

TRimin =

3P
v max

TRimin = Minimum time between 2 succesive reference marks (in ms)
P
= Pole length (in mm)
vmax = Maximum traverse velocity (in m/s)

Installation
It is recommended that the readhead is installed so that the ride height is smaller than 1/2 of the pole length
(1/2P). Angular misalignment and lateral offset should be as close as possible to nominal values.
The DCRM is compatible with the TRS track system
The TRS track system is a carrier-type system for applications that require the scale to be installed/removed for
transit, or simply for any application where thermal expansion of the scale must be independent of the machine
structure. See TRS track system data sheet (LM10D18) for more information.

A

associate company

3

Data sheet
LM10D17_02

Distance coded reference mark part numbering
Magnetic scales
MS10 or MS15
Please choose the appropriate MS magnetic scale with the "Dxxx - Distance coded reference mark" option
selected.
NOTE: The LM10 and LM13 readheads can be used with the MS10 scale, the LM15 can only be used with the
MS15 scale.

MS10 B 0392 A D400
Precision class
A - ?20 um/m
B - ?40 um/m

Reference mark
0000 - No reference mark
xxxx - Where xxxx equals position of machined reference
mark in cm (reference mark position will be within
?1 cm from requested position)
Dxxx - Distance coded reference mark; where xxx equals
basic increment in mm

Scale length
xxxx - Where xxxx equals scale length in cm

Options
A - No cover foil
B - Cover foil supplied (separately - 5 cm longer than tape)
C - No cover foil, ends prepared for end clamping
G - Track system *
* For details on TRS track system please refer to
data sheet LM10D18

MS15 C 0195 B D150
Precision class
C - 100 um/m

Position of reference mark
0000 - No reference mark
xxxx - Where xxxx equals position of magnetised reference
mark in cm (reference mark position will be within
?1 cm from requested position)
Dxxx - Distance coded reference mark; where xxx equals
basic increment in mm

Scale length
xxxx - Where xxxx equals scale length in cm

Additional requirements
A - None
B - Cover foil (supplied separately - 5 cm longer than tape)
C - No cover foil, ends prepared for end clamping
G - Track system *
* For details on TRS track system please refer to
data sheet LM10D18

Readheads
Please make sure that where "Reference" is defined, option A "With reference" is chosen.
LM10, LM15
Example:

LM10 IC

or

010 C

A

10

F

00

Reference
A - With reference
B - No reference
C - Periodic as per scale pitch (2 mm)

NOTE: Please check the LM10, LM13 or LM15 data sheet for a complete part numbering.
LM13

4

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Document issues
Issue

Date

Page

Corrections made

1

7. 12. 2009

-

New document

2

12. 4. 2011

2

Maximum codable length formula and table changed

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