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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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 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. I n t h e equations gear 2 is t h e master gear. The reference axis f o r the radial eccentricity is the axis of the mounting bore see Dln 1 or the axis of the gear seating diameter see Figure 2 or the axis of the two centre holes see Figure 3.
If the c h a r 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 dni Figure 5 and two p a r 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.
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. 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 t o Section 4.
I test flanges a r e provi0ed f o r setting up purposes, the permissible radial eccentricity f applies t o these.
The following 2 measuring planes a re distinguished: This dimension must not be entered in the drawing redundant dimensioning; see DIN Sheet 3.
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.
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 558405 allowance which may differ according t o t h e gear-cutting method used. Recommendation f o r t h i s purpose i a given in column 4 t o 20 i n Table 1.
The e r r o r i n a x i a l parallelism i e designated by Spa. Tolerances and allowances for housing AB understood in this Standard, t h e t e m housing r e f e r dim t o the xin connecting the bearings of a p a i r of mating gears. 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. For gears with V t e e t h t h e following apply: 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.
For denomination of contact f aces and of the relevant qual i t y i ndi ces5845 Figure 1 and 2 ; f o r marking the d i f f e r e n t ear blank shapes, see reference regarding Sup, plementary Sheet 2 i n DIN Sheet I page 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 dim 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.
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. 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. The difference between the upper and the lower allowance of the tip circle ia appended as a minus tolerance.
Base tanuent lenRth allowancea; dual cone width allowances; Dem. In this case the permissible axial eccentricity TAa is: 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.
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.
In this case the permissible radial eccentricity for the tip circle should be taken from Table 3.
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 djn belong t o the shaft f o r permissible variat i o n cin the “shaft” see Table I columu I O. I ma -4 -ea -n -w – above 6 to I2 hove 0. 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.
Base tannent lenRth allowances; dual cone width allowances; Derm.
Measuring plane perpendicular with centre distance line 6 Tolerances f o r uear assemblies. The c e n t re distance allowances apply t o housings with gears according t o Dl3 Sheet 1, Section 2. 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 the 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 frL.