Modular co-ordination and building components

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Modular co-ordination and building components

.r c ?

**

-q5

Ser

TH1

B92

no. 36

2

XGD6

XAllOMAt. RESEARCH COUNCIC

Stanley R.

Kent

-

.

.','-

.

!EIE

SIZING

OF

KOMTLrAR

COIPONENTS

I h e

Standard

Modular

Space Grid

is

a

reference space

g r l d

with

planes

spaced

at

t h e

standard

module of 4 inches.

A

Standard

Modular

Component is

a

building component of standax-

d i z e d

or

s p e c i f i e d

dimensions

which,

when

u s e d w i t h

i t s joint,

fits

the

standard

modular space

g r i d

A

Manufacture Dimension is a

dimension

of

a

component

which is

-the

m a n u f a c ~ x e r t s

catalogue

dimension.

It

may

d e v i a t e

w i t h i n

s p e c i f i e d

limits

due

to

uncon-

trollable f a c t o r s in manufacture.

This

dimension is

set;

o a t

on

the

drawing

with

t h e

understanding

t h a t

d e v i a t i o n s

will

be

talcen

u p

by

t h e

joint.

A

Standard

Modular Dimension is:

(a) a dimension which used once

or

r e p e a t e d l y

is

a multFple

of

the

_standard

_{module of}

4

inches.

(b)

t h e

sum of

a

manufacture

dimension and a joint.

Deviation

fs the difference between

an

actual dimension,

and

t h e

corresponding m~nufacture

dimen-

sion,

!This

difference

may

be

p o s i t i v e , negative,

or

zero.

The L i m i t

Dimensians

a r e %he

maximum

p e r w i t t e d

o v e r s i z e

dimension

(upper

l i m i t ) ,

ox undersize

dimension

(lower

limit

1

,

r e l a t i v e

to the manuTacture dimension,

Tolerance is

t h e

difference

b e h e e n

the

_{p e m l t t e d}

_oversize

_(upper

limit)

and

-the

permitted

undersize

The size

of

modular companents is

p r i m a r i l y dependent

on

t h e

control

of the

standard

modular

space

g r i d .

mus

modular

componerrts

are of

modular dimensions

such

as 8

by

8

by

16

inches,

2

2 h

by

4

by

12 inches;

5

113

_by

_{4 by}

8

inches,

48 by

96

by

1

inch.

The

fractional

dimensions

a r e modular

because they fit

a

m u l t i p l e

o f

4

inches,

i . e . ,

16

inches.

En

every case,

the

modular c,mension

i n c l u d e s

t h e

size of

t h e

componant and

its

joint.

Therefore, the

component

si'ze and

j o h t

s i z e must

be

worked

o u t

together

so

the

s u m

does

n o t

exceed

%he modular

dimension,-

Hav;ing

d e t e m i n e d

the

d e s f m b l e

modular dimension f o r

a

component, assume a

manufacture

dimension and

a joint

dimension.

Fox

example, a standard

m o d u l a r

component

of

modular dimensions

8

by 8 by

16

inches may have

a

manufacture

size

of

7

5/43

by

7

5/8

by

15

₅₁₈

_inches

_and

_{a joint}

_of

318

inch; or

a

standard modular component of modular

d5rnensions

48 by

96

by 1 inch

may

have a manufacture

dimension

47

15/16

by

95 1 5 b 6

by

1 inch with

a

joint

on two

s i d e s

of 1/16

i n c h

and

a

joint

o f

O

inch

on

%he

t h i r d ,

1

I MIN.

T I T

1

L I M I T

me

next consideration is

t h e

feasibility

of

accurately

maintaining

the

manuf

ac-hre size in manufacturing

t h e

component,

and

what deviations

from the

manufacture dimension is reasonable

practice consistent with quality manufacture, bearing

in

mind

that

as

t h e

manufacture

dimension

is increased

t h e

;lain*

dimension

must

be

decreased

( a s

t h e i r

t o t a l must rernaln

t h e

same) and, likewise,

as

the

manufacture dimension is

decreased

t h e

joint dimension

must

be increased.

I f , f o r example,

the

pezmitted

tolerance

is p l u s ar

minus

118

inch

in

7

518;

by

7

518-

by

15

_5/16-inch

_{u n i t ,}

_{t h e}

I

upper

limit would

b e

7

iqches

prrith

t h e

joint becomLng

inch;

%lie lower

limit

wauld be 7~

inch w i t h

the joint

becoming

$

inch.

IChe

manufac-turer must

now

d e c i d e

whether

t h e

tolerance

of

f

inch in the manufacture dimension causing

a

50%

variation

in

t h e

join* s i z e ,

is

good

practfce for

t b e

assembling of

t h e

produc-t,

then

vary

the assumed manufacture

dimension

or

_devia-

;tions accordingly,

In

no case should

t h e

component ncreep''

o u t

of its