Secion 5 SECTION 5 TOLERANCES 5-1
INTRODUCTION Secion 5 Srongwell uilizes ASTM D3917, Dimensional Tolerance of Thermoseing Glass-Reinforced Plasic Pulruded Shapes, for a definiion of he dimensions o e oleranced for EXTREN. Confusion can easily exis when he erms eing discussed are only loosely defined. For example, ASTM D3917 makes a clear disincion eween sraighness, camer and flaness. Srongwell will work wih he cusomer o define he paricular dimensional requiremens. Anoher excellen source for erms uilized in he pulrusion indusry is ASTM D3918, Sandard Definiion of Terms Relaing o Reinforced Plasic Pulruded Producs. Srongwell was exremely acive in formulaing oh of hese ASTM specificaions and mainains a coninued acive working relaionship on ASTM Commiees. For reference, classifying EXTREN per ASTM D3647, Classifying Reinforced Plasic Pulruded Shapes According o Composiion, yields he following: EXTREN Series 500/525 = GCPF EXTREN Series 625 = GCVF INSPECTION Srongwell verifies he adherence o dimensional olerances and visual sandards for he iniial par from all EXTREN producion runs. A Srongwell, his iniial sample is known as he Firs Aricle. The Modulus of Elasiciy is also verified y a simple eam deflecion es which is performed on he producion floor. Srongwell s producion operaors are an inegral par of he Srongwell Qualiy Assurance program. The operaors have een rained o inspec he produc as i is produced wih he qualiy assurance inspecors funcioning as audiors and rainers. TOLERANCES The olerances presened govern EXTREN srucural shapes and may no e arirarily applied o oher pulruded profiles. Srongwell mainains an exremely acive cusom pulrusion usiness and hese profiles place differen demands on he composie design and dimensional olerance. For example, EXTREN srucural shapes are alanced composies while cusom composies, ecause of heir special applicaion, are no necessarily geomerically alanced. In he olerance secion, some mahemaical symols will e used. These symols are defined elow: > "greaer han" wih he ip of he arrow poining o he smaller numer. For example, if i is saed ha " > 2", his means ha dimension "" is greaer han "2". Conversely, " < 2" saes ha dimension "" is less han 2". TOLERANCES "greaer han or equal o" wih he ip of he arrow sill poining owards he smaller numer. However, " 2" now is inerpreed as "" is greaer han or equal o "2". NOTE: Sandard olerances will e assumed as he arge specificaions for cusom shapes in he asence of any cusomer supplied specificaions. Srongwell sraighness olerances are ased on sraighness as defined in his secion. Camer is a special cusom requiremen (also defined in his secion for plae). 5-2
Secion 5 STANDARD TOLERANCES OPEN SHAPES d d f f MAXIMUM OR SHAPE DIMENSION TOLERANCE MINIMUM (% of nominal) TOLERANCES ANGLES = hickness -10% -.010 minimum = flange widh ± 4% ±.094" maximum = hickness -10% -.010" minimum CHANNELS f = flange widh ± 4% ±.094 maximum d = deph ± 4% ±.094" maximum = hickness -10% -.010" minimum W AND I SHAPES f = flange widh ± 4% ±.094 maximum d = deph ± 4% ±.094" maximum NOTES: For example, a 1/8" hickness would have a olerance minimum of.125" - 10% =.112". An angle wih a flange hickness of.090" would have a olerance of.090" -.010" ha is, a minimum olerance of.080". Regardless of he flange widh, a olerance of no greaer han ±.094" is permied. This maximum olerance is o e used when 4% of "" or " f exceeds 3/32. 5-3
STANDARD TOLERANCES OPEN SHAPES Secion 5 STRAIGHTNESS As per ASTM D3917, sraighness is he upward deviaion of he srucural shape when resing on a fla surface in such a manner ha he weigh of he pulruded shape minimizes he deviaion. LENGTH ALLOWABLE DEVIATION (in) All lengh in fee x.050 * *Tesed on a minimum lengh of 16 fee or he run lengh. NOTE: Srongwell sraighness olerances are ased on sraighness as defined aove. Camer, as defined in his secion, is a special cusom requiremen. TWIST As per ASTM D3917 and ASTM D3918, wis descries he condiion of a progressive roaion in he srucural shape and is measured in such a manner ha he weigh of he pulruded shape minimizes he wis. L LARGEST DIMENSION-WIDTH OR DEPTH ALLOWABLE TWIST 1.5 or less 1 o imes lengh in fee 1.5 o 2.99 0.5 o imes lengh in fee 3 and over 0.5 o imes lengh in fee 5-4
Secion 5 ANGULARITY STANDARD TOLERANCES OPEN SHAPES As per ASTM D3917, angulariy is he adherence of he angles in he pulruded shape o a specified value. SPECIFIED ANGLE ALL TOLERANCE ± 2 o FLATNESS (FLAT SURFACES) As per ASTM D3917, flaness is he deviaion from sraigh across he widh of he dimension. Flaness can e conrased wih sraighness, which specifies deviaions along he lengh of he par. WIDTH, ALL TOLERANCE.008 per inch of widh.008 minimum 5-5
STANDARD TOLERANCES TUBES Secion 5 d d D OUTSIDE DIMENSION SHAPE DIMENSION TOLERANCE CONDITIONS ROUND TUBE = hickness - 20% D < 2-15% D > 2 D = ouside ±.020 D < 2 diameer ± 1% 2 < D < 4 ± 1.5% D > 4 = hickness - 20% < 2-15% > 2 SQUARE TUBE = ouside ±.020 < 2 dimension ± 1% 2 < < 4 ± 1.5% > 4 or d = hickness - 20% < 2-15% > 2 RECTANGULAR TUBE d or = ouside ±.020 (d or ) < 2 dimension ±1% 2 < (d or ) < 4 ±1.5% (d or ) > 4 NOTE: of 1-3/4 x 1/8 and 1-3/4 x 1/4 vary from sandard o provide elescoping of hese secions. 5-6
Secion 5 STRAIGHTNESS STANDARD TOLERANCES TUBES As per ASTM D3917, sraighness is he upward deviaion of he pulruded shape when resing on a fla surface in such a manner ha he weigh of he pulrusion minimizes he deviaion. TWIST SPECIFIED OUTSIDE DIMENSION ALLOWABLE DEVIATION (in) 2 or less.020 per foo of lengh > 2.030 per foo of lengh NOTE: Srongwell sraighness olerances are ased on sraighness as defined aove. Camer, as defined in his secion, is a special cusom requiremen. As per ASTM D3917 and ASTM D3918, wis descries he condiion of a progressive roaion in he pulruded shape and is measured in such a manner ha he weigh of he pulruded shape minimizes he deviaion. LARGEST ALLOWABLE MAXIMUM OUTSIDE DIMENSION TWIST TWIST wis 1.5 or less 1 o per foo 7 o of lengh > 1-1/2 1/2 o per foo 5 o of lengh ANGULARITY As per ASTM D3917, angulariy is he adherence of he angles in he pulruded shape o a specified value. SPECIFIED ANGLE ALL TOLERANCE 2 o FLATNESS (FLAT SURFACES) As per ASTM D3917, flaness is he deviaion from sraighness across he widh of he dimension. Flaness can e conrased wih sraighness which specifies deviaions along he lengh of he par. specified angle WIDTH, ALL TOLERANCE.008 per inch of ouside dimension.008 minimum 5-7
STANDARD TOLERANCES ROUND AND SQUARE BAR Secion 5 D STRAIGHTNESS As per ASTM D3917, sraighness is he upward deviaion of a pulruded shape when resing on a fla surface in such a manner ha he weigh of he pulrusion (or pulruded shape) minimizes he deviaion. TWIST (BAR ONLY) SHAPE DIMENSION TOLERANCE CONSTRAINTS ROUND ROD ouside diameer (D) ±.020 D < 3 SQUARE BAR ouside diameer () ±.020 < 3 OUTSIDE DIMENSION TOLERANCE (in) < 1.020 per foo of lengh > 1.030 per foo of lengh NOTE: Srongwell sraighness olerances are ased on sraighness as defined aove. Camer, as defined in his secion, is a special cusom requiremen. As per ASTM D3917, and ASTM D3918, wis descries a condiion of a progressive roaion on he pulruded shape and is measured in such a manner ha he weigh of he pulruded shape minimizes he deviaion. wis LARGEST OUTSIDE DIMENSION < 1 > 1 ALLOWABLE TWIST 1 per foo of lengh 0.5 per foo of lengh FLATNESS (FLAT SURFACES) As per ASTM D3917, flaness is he deviaion from sraigh across he widh of he par. WIDTH, All ALLOWABLE TOLERANCE.008 per inch of ouside dimension.008 minimum 5-8
Secion 5 STANDARD TOLERANCES PLATE NOMINAL PLATE WIDTH DIMENSION TOLERANCE 48 ALLOWABLE TOLERANCE = hickness -10% of hickness -.040 maximum = widh ±3% of he widh ±.094 maximum 60 = widh - 3/16, + 0 59-13/16-60 CAMBER As per ASTM D3917, camer is he allowale deviaion of he side from a sraigh line. THICKNESS ALL ALLOWABLE TOLERANCE (in).025 imes he lengh in fee 5-9
CUT LENGTHS STANDARD TOLERANCES MISCELLANEOUS Secion 5 SPECIFIED LENGTHS (f) ALLOWABLE TOLERANCE* o 8-0, + 0.250 > 8-20 -0, + 0.375 > 20-24 -0, + 0.500 > 24-0, + 3.000 *Applies only o srucural shapes and plae. SQUARENESS OF END CUT SHAPE PLATE OTHER EXTREN SHAPES ALLOWABLE TOLERANCE ± 1 o ± 1 o 5-10