JDN 200

JOHN DEERE DES MOINES STANDARD

JDN 200 TOLERANCES

1.0 SCOPE

This.stdard- the tolerances that are to be used in the design and manufactme of inch&& or dual-dimensioned parts for John Deere Des Moines Works. Hard metric parts will be cove& in a sepamte standard. Tolerances applying fo a special design problem for which a design standard has been established (roller chain sprockets, splines, etc.) wilI be given in the design standard and will not be repea@d in tbis standard. The tolerances aiven in this standard are minimum tolerances and more liberal tolrrancs should be sceeiiied on drawing whenever wssible.

2.0 DJVINITIONS

In this standard, tolerances are referred to by the terms “general” acd “special”. General toleratnzea are the most prevalent tolerances applied to a drawing or a group of drawings. They are either p&ed on the drawing format or lined in a reference document. All other tolerances fall into the category termed ‘special”. Soecial tolerances most be shown on the drawioa.

3.0 APPLICATION OF TOLERANCES

All dimnsions on product Engineering drawings shall have tolerances. This requirement can be met in 01lc of the foIlowing ways, in decreasing order of priority:

a. as a tolerance added to the individual dimension, including form and positional tolerancirtg.

b. as a requiremerit of a specification referenced on the drawing, excluding reference to a gemzal tolerance standard. Example: reference to hardware standards, sprocku standards, etc.

c. as a general tolerance wte added to the body of the draw@, including notes refererring toleramze standa& such as JDN 200. Sections 4.1 through 4.8 of JDN 200 apply with no drawing oote reqdred.

d. as a general tolerance shown in the title block. NOTE: Some old drawings have this information stamped adjaceot to the tide block.

e. as a general tolerance as shown in JDS-GZ5 when referenced in the title block.

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V.XGOD lhk No. NlO 22Jut97

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w JOHN DEERE DES MOINES JbHN DEERE STANDARD

JDN200 TOLBXANCES

4.0

AU new drawings shall have a reference to JDN 200. Existing drawings shall have a lefermx to JDN 200 added when they are revised.

It shall be the respon&iity of the design engineer to determine the allowable tolerances tbfU will permit the most economical manufacture commensurate with part function.

NOTE: Units shown in this standard are inch [mm].

GENERAL TOLERANCES

These tolerances shall apply to all dimensions unless more specific tale- are shown on tbs drawing.

4.1 Commercial Stock Size.5

4.1.1 Material stock tolerances are as referenced in John Deere Mverial Manual (JDM) or American Society for Testing and Materials (ASTM) Standards or American Iron and Steel Institute (AISI) Manual.

4.1.2 Standard hardware tolerances are as referenced in John Deere Parts Specificatinn (JDS) Manual.

4.2 Surface Finish

4.2.1

4.2.2

4.2.3

Machined surfam with dimensional tolerances up tn and inchding * .001[.025l shall have a maximum roughness height of 250 microinch [6.3 microme%r] AA unless o&wise specified.

Machined surfaces with dimensional tolerances greater than f.001 [.O25] shaU have a maximum roughnew height of 500 microinch [12.5 microtir] AA unless cbrwise specified.

Drilledholesandcutoffsurfacesshallhaveamaximum roushnss height of 1000 microinch [25 micrometer] AA unless otherwise specified.

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JOHN -DEERE DES MOINES STANDARD

JDN200 TOLERANCES

4.3 Chamfers

Definite dimensions should be skxvn only when required by the design. When the nuin purpose is to remove burrs, specify “Break Edge”, “Break Comer” or “Free from Burrs” to “kkize cost.

The terrns “Break Edge”, “Break Comer” or “Free from Burrs” shall be interp& to mean’s ,008 [.2] minimum break and a .&XI [I.51 maximum break. A comer or edge break may be either a chamfer or a radius.

4.4 DIstortion

‘Ihe rr&nmm permissible distortion due to punching, shearing, and bending opzratkns other than crossbreaks on sheet metal and bend &xsections shall be .06 [IS]. This petmksible distortion shall be in addition to the commercial form tolerances for steel as described in JDM, ASlM, and AISI manuals (Ref. 4.1). All parts with diitortion greater than .06 [1.5] shall be flattened in the distortion area with “0 drawing note reqdred.

All parts for which limiting of distortion to .06 [l S] is unnecessary shall be noted thILp: “Distortion Rrndssible” or “XX Maximum Distortion Petmissible”. ‘The note shall have a lea&r line to tbe distortion area, if appropriate.

All parts requiring closer cona of flam or straighhless than commercial fotm toleramzs a&or distortion leas than .06 [1.5] shall be noted on the drawing.

All distortion notes applying to a limited atea shall use a leader line to indicate the M to which the mte applies.

Distortion is permissible on all crossbreaks and bend intersections on sheet metal pans unless otherwise SQecified.

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JOHN’DEERE DES MOINES STANDARD

JDN200 TOLERANCES

4.5. HoleandBendLecaths

4.5.1 Holes and berids dimensioned from the edge or end of a part shall be measwed ftum the longest edge, disregarding the amount of breakoff.

Rectangular parts, flat or formed, will be measured on the basis of two assLmyd locating points on the longer side and on assumed locating point in the c-enter of the short side, unless otherwise specified. This does not apply to tubular parts. Interpretation:

I

I I 1 I- 1

4.52 Bendsotherthan90”shallbemeasurrdmtheapuofthebendunlessatvrwisspecified. 90”bendssMlbemeasuredtothetangemofthebendradiusunlessomerarisespcified. In most cases, dimensions to the outside of the material are preferred. Tolerance on bend locations is 5.06 [1.5]. Interpretation:

VmiM No. NlO

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JOHN’DEERE DES MOINES STANDARD

JDN 200 TOLERANCES

offsets and parallelism are measured from tangent to tangent, with the longer leg on the gauging surface, unless otherwise specified. Bow in the leg may require the use of locators under the part as shown. Interpretation:

4.5.3 Multiple Bends - Sheet Metal

It is assumed that multiple bends on material up to and including ,075 [1.9] thick must match the form template within .06 [1.5) unless otherwise specified on the drawing. Sheet metal parts may be hand deflected to the template.

lltis is equivalent to u-i& aU bend angles, radii and Wnd

dimensions treated as basic.

On material over ,075 [1.9] thick, bend locating and bend angle tolerances apply.

Interpretation:

4.5.4 Bend Angles Material thrwgh .I34 [3.4] thickness lt3’= Material over ,134 [3.4] thickness f lo

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Date 22Jul9l

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JDNZOO TOLERANCES

4.6 FmchedHoles

4.6.1 Size Tolerances

Tolerance vahm do not include taper on breakout side of hole. Hole size shall be checked on pierced face of material. Checking shall be with plug gages or equivalent.

MATE~THIcKNEss HOLETOLERANCE(ALLSIZES) -1

4.6.2 Comer Radius-Square and Rectangular Holes

A maximum comer radius of .04 (11 is allowable on square and rectan@r pinches up to and includii 1.00 [25.4] (longer dimension) and .06 [1.5] on punches over 1.00 [25.4], unless otherwise specified.

4.7 DrilledHoles

4.7.1 Size Tolerances

Checking shall be with plug gage3 or equivalent.

,748 [19] 1.260[32] 012 (0.31 GO3 [O.OS] 018 [0.46] 006[0.15]

1.21% [32] 020[0.5] 003 [O.OS] 030[0.76] 010[0.25]

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JDNZOO N

Varkll Date Da* Date Date catGxk No. NIO wml 4340-06 Pqa6ofl4

JOHNDEERE DES MOINES STANDARD

JDN200 TOLERANCES

4.8 Squareness of Ends - Steel Bars, Plates, Structural Shapes and Tubs

4.l.L

4.7.3 Drilled Hole Timing

LO&Oll

Rectangular coordinate location of drilled holes !z .CL? [O.s] For holes located by basic dimensions the location tolerance is .OlS LO.41 diameter of hue position unless otherwise specified. Tquallly spaced” position is co&dered a basic dimension.

All drilled holes in round or hex stock shall be considered timed as shown arimin 1” unless otherwise specified by a closer or looser tolerance or a note indicating that timing is not required.

Holes through square and rectangular tubing may be out of per@icuiar with the tube wall by 1”. providing that the spacing tolerance on the hole pattern is not exceeded.

The following are minimum squareness tolerances for ends steel bars, plates, sf+ruuunI shapes, and tubes with length tolerances of f .06 [1.5] or greater.

Parts requiring closer squareness tolerances will require special cutring pmcAures at &rcased cost. If closer squareness is required, squareness tolerances must be shown on the drawing.

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JDN200 TOLERANCES

4.8.1 Angles

The length is measured along the apex of the angle.

The ends must be square within .lO (2.51 on legs up to and includiig 2.ooO [Sl] and square within .12 [3] on legs over 2.ooO (511.

Interpretation: (2.CGU [X] angle ihtmted)

! r ,:3 (2.51 MAX.

1 '- .I0 (2.51 MAA.

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4.8.2 Channels

The length is measured along the center of the web. The ends must be square w?thio .I0 [2.51 on the legs and .06 [I.51 on the web of channels up to and including 3.000 p6.21 wide. The ends must be square within 20 [5] on the legs and .I2 [3] on the web of chant& over 3.00 p6.21 wide.

Interpretation: (2.OLM [Sl] wide chantA ihstrated)

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JTm 200 TOLERANCES

4.8.3 Flats and Plates

‘Ihelengthismeasuredalongthecenterlineofthepart~shortestedgeonooeendmtbe longest edge 0i1 the other, disregarding the amount of breakoff.

The emis must be square within .06 [l.S] on parts up to and including 6.000 (152.41 wide and within .lO [2.5] on parts over 6.000 [152.4] wide. Interpretation: (5.000 wide tlat iUustrat~)

- .03 [3.5/ MAX

4.8.4 Tubing

The length is measured to the extreme ends, as if the part was between paraikl blocks.

The ends must be square within .06 [1.5]

Interpretation: I

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JOHNDEERE DES MOINES JOHN DEERE STANDARD

/ JDN200

TOLERANCES

4.8.5 Roundsand~

The length is measured from the shortest edge on one end to the longest edge on the odter end, disregarding the amount of breakoff.

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Interpretation:

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4.9 Hole Si and Location To&ran=

Punched hole size and location tolerances wiU be applied unless the bole callout has a tit&h mark, (q), uses the term “Drill”, ‘Ream”, etc., or has specific tolemnces shown on the size atxVor location dhnensions.

Tolerance on hole location is f .04 [1.4] between holes and f .06 (1 .Sl from holes to other features for holes without machine finish.

4.10 Length Tolerances

4.10.1 Sheet Metal Length atxi Width (through 221 [5.6] ddcknes)

Width or length up to and including 24.00 [610] = f.06 [1.5] Width or length over 24.00 [610] = k.12 [3]

4.10.2 Etars, Plates, Tubes, and Structural Shapes

Length up to and inciuding 84.00 [2134] = f.06 [1.5] Length over 84.00 [2134] through 144.00 [3658] irAu.sive = k.12 [3] Length over 144.00 (3658) = f.20 [5]

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JDN200 TOLERANCES

4.11 Pnemm&TirePresm-e

Au drawings and/orqeci!icatio~ for tire and wheel assemblies shall b&ate the presmre to which thetireistobeirdlakd.

The drawing and/or specification note shall read “Inflate Tie to XXEJ m]”

Unless otherwise specified, the tolerance on inflation pressure is * 15 % or 2 PSI, whichever is greater.

4.12 ZhCF%tillg

Unless otherwise specified, zinc plating shall be .OOM f JO02 [O.Ol f O.oOs] thick, with a yellow chromate conversion coating.

New drawings should specify zinc plating per JDS 117. ‘The standard plating calloot is: “Plating per IDS 117: Fe5 5-15~ C”.

4.13 Induction Hardening

Unless otherwise specified, the tolerance on dimensions locating I-IT30 itrJuctiot~ hankned zones from other features is f.06 [l.q.

4.14 Part Location in weidments

Unless otherwise specified, tk tolerance on linear or radii dimension locatiog component parts in weldments is * 05 [1.5]. The tolerance on angular dimensions locating co- parts in weldmenu is f lo.

When gage holes are used for locating components, gage ho1e.s and the width of gage slots shall be aligned within .03 [0.8] unless otherwise specified. Gage holes shall align within the length of the gage slots unless otherwise specified.

4.15 Other Formed or Fabricated Dimensions

Linear dimensions f .03 [0.8] Radii dimensions + .06 [1.5], -.03 [0.8] Angles other duo bends f lo

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JDNZOO TOLERANCES

4.16 Machine Fiied Dimensionr

Turned or bored diameter or length rt .02 [O.S]

Planed. shaped or milled surface: For dimensions from another finished surface f .02 [O.S] For dimensions from a locating pohu on an unfinished surface f .03 [0.8] For dimensions without locating points on an unfinished surface f .04 [l]

Fillet radii f .02 [0.5]

When no radius is specified. a sharp comer to .OS I! .5] maximum chamfer or radius is allowed.

Angle.9 * 10

4.17 FlameCutting

Rotile tolerance is as spefifted on drawing.

Surface Fii

!I Free of blows and kerf variations. AU surface defects are ground or welded atrl gmund.

a Blows with round edges and gradual kerf variations (not notches) are accqhbk. Mismatch due to start and stop step may be JO (2.q but must be within tolerance zooc.

??i Blows and kerf variations, incMing notched shapes .20 [5] deep are accq&k= Mismatch due to start and stop step may be .I2 [3] but must he within tolerance zone.

4.18 Laser cutting- Fla! stock

Unless otherwise specified, the foliowing tolerances apply to parts laser cut from Bat mate&

Hole size 5 .005 [O. 131 for holes labeled with machine CnWlaser optional, putxb rize tolerances tbr holes without label.

HoIe location -.04[1litb locating dimensions treated as basic.

Rofde (_nl.o3(0.8)) with profile dimensions treated as basic.

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VE+l hia Ihi4 Date Date cat. code Nr WI0 22M97 k34o.M hpl2efl4

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\ JDN200

TOLERANCES

4.19 Iron Castings

Tole-listedin~MBllshallappiyforsandcastingsofgrayiron,wdularorduaileitoa malleable iron or white iron, unless otherwise specified. Drawings should have the note “Casting Tolerances Per JDM Bl 1”

4.20 AluminomCasdngs

The following tolerance-s apply to sand molded ahmkum castings.

Draft Allowances:

“Green sand” molded surfaces Cores-includes chemically hardenal cores

Height Draft Height Draft

RIrough .75 [19] 3” Through 50 [13] so

Over .75 [19] thru 5.00 [125] 1.50 Over 50 [13] thru 2.00 [SO] 3O

Dver 5.00 [125] 0.Y Over 2.00 [50] 1.50

Wall thickness The lbnha specified apply to the tbimrat section of a given wall. lbe maximum thickness at any other section may exceed the maximum specified by the amount of dmft allowamx.

Fillet radii: f 10%

Core, Cope or Drag Shift - mismatch (not accumulative witi casting tolerance) .04 [l] max.

Daisbn De&ion De&ion Dabbm Daip Ctl JDNtOO 55449 N Date Date mta m(s cat code

No. NlO zzld97 4340461 hp13or14

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JOHN ,DiERE DES”MOINES STANDARD

. / JDN 200

TOLERANCES

AU Other Casting Diensions:

5.0 SPECIAL TOLERANCES

This section is a design guide for special tolerances, based on process capabiiitia. llmc tolerances must be shown on the drawing when appropriate.

5.1 Tolerances applying to parts for which a design scmdard bas been established shall be noted and/or toieratxed on the drawing a8 shown in the design standard.

5.2 Forgings

JLWS (Marmfacturing Process Manual 5) lit.5 tolerances that are to be wed on forging dimensions.

5.3 ThadedParts

Threaded parts with thread engagement longer than 1.5 titxs the thread dipmter shall have a note on dhz drawing stating the length of thread engagement so that proper gage can be provided. (The lead tolerance is critical for long dwead engagement and this cannot be properly checked widt stalKhidlreadgaga.

VUliM No.NlO

Daisbm 99449

Dnae 22.Jd97

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D¶b Data

JDN 200

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