DIN 58405 PDF

Por d i f f e r e n t f i e l d s of application involving f i n e mechanics, see D I N Sheet 1 Section 4, Table I column 1 s p e c i f i e s a range. DIN Spur Gear Drives for Fine Mechanics; Tables. DIN Spur Gear Drives for Fine Mechanics; Indication in Drawings, Examples for Calculation.

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I f the upper and lower allowances of the dual f lank r o l l t e s t distance have been recorded according dkn o Section 4. They a r e intended t o serve t h e designer as a check l i s t of a l l the points which must be taken i n t o account when choosing a gear f i t. The face alignment error is designated as pos i t i ve if t he var i at i on i s i n the right-hand dir e c t i o nand negative i f i t i a i n the left-hand di r ect i on with reference t o the design value n of the h e l i x angle Bo.

The centre distance a” can dln s e t by placing the appropriate s l i p gauges between t he two mounting a rb o rs or the individual arbors. The c e n t re distance allowances apply t o housings with gears according t o Dl3 Sheet 1, Section 2.

DIN 58405-2

In t h i s connection i t should be noted i n p a r t i c u l a r t h a ti n the case of disc-shaped gear blanks i n which t h e length of bore i a not s u f f i c i e n t t o support the gear cin during the gear-cutting procese, the end faces serve ae contact faces during the gear-cutting process and hence t h e i r geometrical and position var i at i ons determine t he qual i t y of th e tooth system.

The s l i p gauges a re then removed, t h e two gears ar e mounted on the arbors, brought i n t o cont a c t and r o l l e d one on the other. The values specified relate to the bearing when inetalled.

The cin o t a l composite error according t o Section 4.

If p l a i n b e a r i n g s are uaed, t h e i r dimensional and geometrical accuracy should be i n line with t h e correaponding i i w s for b a l l boaringo according t o D I N Base tanuent lenRth allowancea; dual cone width allowances; Dem. The e r r o r t r a c e must remain between the two l i n e s previously drawn which represent the bounda r i e s of t h e tolerance zone.

Base tannent lennth allowances; dual cone width allowances; perm. I n t h e equations gear 2 is t h e master gear. In the came of instrument drives it is recommended, particularly when mounted overhung, that ball bearings with increased radial clearance ehould be used and proloading applied. Che allowances a r e the same a s the base tangent length allowances divided by the sine of the pressure angle. Page 4 DIN Sheet 2 2.

These allowances, together with the centre distance allowances, are the criteria for a gear fit. 58450 s t r a i g h t or h e l i c a l spur gears without addendum modification 5405 that the gear t othe r e dkn u l t i n g dual be t e s t e d i a within t h e scope according t o DIB Sheet I Section 2 f l a n k r o l l t e s t distance allowances a r e as follows: In this case the permissible radial eccentricity for the tip circle should be taken fin Table 3.

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Permissible radial eccentricits for tip cylinder when this is n o t used 5405 settinn UE Table 4 Dln radial eccentricity f o r. For the end faces of a gear blank which are used as contact face o r clamping face the 58450 axial eccentricity Tea is specified in Table 5.

Minor var iat i o n s may, however, a r i s e in this connection because the individual allowances have been rounded t o preferred numbers. Assuming t h a t t h e gear t o be t e s t e d i s within the scope according t o D I N Sheet 1, Sect i o n 2, the centre distance of s t r a i g h t or h e l i c a l spur gears without addendum modification i s set on the dual flank r o l l t e s t e r a s folows: Gear blank f o r gear with external t eet h Bearing seating diameter Centre hole Figure The q u a l i t y of a tooth system depends very l ar gel y on the accuracy of the gear blanks.

Since the dual flank roll testing is generally carried out as a final inspection, and since it cannot be performed until the teeth have been finished, base tangent length and dual cone width allowances have been specified during manufacture measurement of tooth thickness. If the c h a r t feed i s operated and a t ra c dkn drawn corresponding t o t he upper and lower allowance, two concentric c i r c l e s a r e obtained if the recording i a made in pol ar Co-ordinates see Figure 5 and two p a dun a l l e l s t r a i g h t lines i f the recording i s made i n rectangular Co-ordinates see Figure 6.

DIN tol f cylindr For any given bearing a l l the s t at i onar y par t e belong t o the housing and a l l the p a r t s r o t a t i n g with the gear belong t o the shaft f o r permissible variat i o n of the “shaft” see Table I columu I O. The tolerances and allowances etated’in the following Tables apply to gears according to D M Sheet 1, Section 2. Like the base tangent length allowances, compliance with the dual cone width allowances can a l s o be determined by t h e dual flank r o l l t e s t i n The procedure i s the same as t h a t described under Section 4.

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The difference between the upper and the lower allowance of the tip circle ia appended as a minus tolerance. I ma -4 -ea -n -w – above 6 to I2 vin 0.

This dimension must not be entered in the drawing redundant dimensioning; see DIN Sheet 3. FP With c i r c u l a r e r r o r t r a c e s see Figure 5 the upper dlovance of dual flank roll teat distance – – Figure 5. I f one of these requirements i s over-stepped the new conditions which r e s u l t regarding clearances, accuracy of transmission, tooth engagement conditions, etc.

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Measuring plane perpendicular with centre distance line 6 Tolerances f o r uear assemblies. I n t h e case of housings made of aluminium a l l o y s and s i m i l a r materials, s u i t a b l e measues should be taken, e. If the shaft and gear are made in one piece, the radial eccentricity between the mounting In the milling machine 0.

This i s performed a s follows: Measuring plane parallel witEa centre distance line Figure 8 E r r o r in axial parallelism f p s. Base tanuent lenuth allowances; dual cone width allowances; Dem. The c e n tre distance a” i s then reduced each time by the upper and louer allowance of the base tangent length converted t o the r a d i a l direction. For grades P 8 it is recommended that the tip cylinder should be used for setting up the gear blank, or that test flanges should be provided.

The uncertainty i n measurement due t o var i at i on of the measuring Observance of t h e s p e c i fi e d allowances may be determined d i r e c te.

For gears with V t e e t h t h e following apply: The cumulative error can be found by rolling the gear to be tested with a master gear, f o r which purpose the total composite error of the master gear must be known and, where necessary, deducted from the teet result.

The ideal involute surface corresponding to 5805 nominal dimension and shown in Figure 4 is outside the boundary involutes because of the negative base tangent length allowances see a l s o DIN Sheet IFigure I. The e r r o r i n a x i a l dih i e designated by Spa. I the tip circle tip cylinder is used for setting up the gear blank on the gear-cutting f machine, the radial eccentricity of the gear blauk according to Table 4 should be observed. Tolerances and allowances for housing AB understood in this Standard, t h e t e m housing r e f e r e t o the component connecting the bearings of a p a i r of mating dij.

Base tannent lenRth allowances; dual cone width allowances; Derm. In connection v i t h the s e l e c t i o n of b a l l b e d n g e i t should be noted t h a t the tolerance allowed f o r t he bearing bores Q i n t h e housing r e l a t i v e t o diin tolerance on t he centre distance Ta must be reduced by the amount of the r a d i a l run-out of the b a l l bearing outer ringe djn.

The reference diameter to which the axial eccentricity is related is found as: