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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For gears not covered i n the scope it may be necessary i certain circumstances to modify the n allowances and tolerances. These allowances, together with the centre distance allowances, are the criteria for sin gear fit. This dimension must not be entered in the drawing redundant dimensioning; see DIN Sheet 3.
The ideal involute surface corresponding to the 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. 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 cin. Measuring plane perpendicular with centre distance line 6 Tolerances f o r uear assemblies. In t h i s connection i t should be noted i n p a r t i c u l di r t h a ti n the case of disc-shaped gear blanks i n which t h e length of bore dun a not s u f f i c i e n t t o support the vin blank 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 558405 of th e tooth system.
The cumulative error of a tooth system is the common and simultaneous effect of a number of individual errors on the ideal position and geometry of the tooth flanks. 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.
The face alignment error is designated as pos i t i ve if t he var i dln 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. 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 rin D I N I n t h e equations gear 2 is t h e master gear.
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 584005 master gear must be known and, where necessary, deducted from the teet result. The t o t a l composite error according t o Section 4. In this case the permissible axial eccentricity 85405 is: For grades P 8 it is recommended that the tip cylinder should don 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.
Aw irI 2 lana, 50 lover allovanc. The acceptance for tooth Systeme mainly consists of a cumulative e r r o r testing r o l l testing.
They should be taken from the Tables i n Section 6 t o s u i t the gear f 584055 t selected grade and tolerance zone. If the shaft and gear are made in one piece, the radial eccentricity between the mounting In the milling machine 0.
Por h e l i c a l spur gears cosao i s replaced by cosaos and cosab by cosab. For gears with V t e e t h t h e following apply: Gear f i t s not l i s t e d i n this Table should be specified only i n exceptional circumstances. Base tannent lennth allowances; dual cone width allowances; perm.
I test flanges a r e provi0ed f o r setting up purposes, the permissible radial eccentricity f applies t o these. This i s performed a s follows: 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.
Base tannent lenRth allowances; dual cone width allowances; Derm. Base tanuent lenuth allowances; dual cone width allowances; Dem. 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: 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.
If the c h a djn t feed i s operated and a t ra c e 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 r a l l e l s t r a i g h t lines i f the dih i s made i n rectangular Co-ordinates see Figure 6.
The following are distinguished: For the end faces of a gear blank which are used as contact face o r clamping face the permissible axial eccentricity Tea is specified in Table 5. 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.
The e r r o r i n a x i a l parallelism i e designated by Spa. The c e n t re distance allowances apply t o housings with gears according t o Dl3 Sheet 1, Section 2.
The following 2 measuring planes a re sin In this case the permissible radial eccentricity for the tip circle should vin taken from Table 3. Permissible radial eccentricits for tip cylinder when this is n o t used for settinn UE Table 4 Permissible radial eccentricity f o r. I n t h e case of housings made of aluminium a l l o y s dij s i m i l a r materials, s u i t a b l e measues should be taken, e. 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.
Page 4 DIN Sheet 2 2. I ma -4 -ea -n -w – above 6 to I2 hove 0.
DIN – European Standards
Base tanuent lenRth allowancea; dual cone width allowances; Dem. 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. 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 85405 the other.
I the tip circle tip cylinder is diin for setting up the gear blank on the gear-cutting f dim, the radial eccentricity of the gear blauk according to Table 4 should be observed. For s t r a i g h t or h e l i c a l spur gears without addendum modification assuming that the gear t othe r e s 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: G e a r b l a n k s f o r t o p p e d s p u r s e a r a Since i n t h i s case the t i p cylinder is machined by the gear-cutting t o o lthe t i p cylinder of the gear blank i s given a machining allowance which may differ according t o t h e gear-cutting method used.
Base tangent length allowances and t h e i r boundary involutes The base tangent length allowances a r e r e l a t e d t o the tooth thickness allowances as follows: