Trail of the awl outside large cone workpiece is special the development of measure

Advocate feet 2.

Fixed turn feet 3.

Zun Lian is received board 4.

Right join board 5.

The activity turns feet 6.

Cursor 7.

Workpiece pursues sketch map of 1 measure structure 2 measure structure and if the graph is shown 1 times,measure principle measure structure. It changes the I that make all-purpose bevel protractor, tailor-made vernier, join board and composition of other spare parts by two classics. Two all-purpose bevel protractor are secured respectively in tailor-made vernier advocate on feet and secondary scale, use join board to secure, the position of join board should make sure the bend feet the centre of a circle of bevel protractor measures what face and vernier measure a range to hand in an axis to go up in bevel protractor. When measuring, the cursor measure advocate feet (scale) rely on closely to be being measured on workpiece end panel, the secondary scale of mobile vernier (the) that change rule, adjust two bevel protractor at the same time base feet, make two base close together joint is in feet on the cone outside workpiece, angle of the cone outside giving work is read to be worth on bevel protractor, outside numerating directly on vernier the dimension crossing a line of cone and end panel is worth. The indication error of all-purpose bevel protractor is ± 0.

02, the indication error of tailor-made vernier is ± 0.

02mm. Is workpiece measured of dimension say to note tolerancepublic errand to be: ? An enclosure for storing grain see prostitute embed? of skirt  Sui.

08, ± of diametical dimension public errand 0.

13mm. The basis measures a principle commonly, measure indication error should be the 1/3 ～ 1/5 of public errand of the object that be measured, accordingly the angle of this measure and length indication precision can satisfy workpiece to gauge a demand respectively, but whether can the indication precision that sets size produce change, it is the issue that must consider in measure design. According to the working principle of I all-purpose bevel protractor, the centre of a circle of bend feet is located in an activity to measure tool reference plane and secure those who measure tool reference plane to cross a line (centre of turning circle) on, namely when bend feet is rotational, its centre of turning circle is certain. When devising measure, what be bend feet with the flank of vernier is fixed measure tool reference plane, the centre of turning circle of bend feet also is in two measure tool reference plane hand in a line to go up, designing centre of turning circle namely also is certain. Accordingly, the measure value that vernier measures is namely measure tool reference plane and vernier advocate feet (scale) , secondary scale (change rule) the distance that flank crosses a line, it does not follow the change of angle and change. From this knowable, the angle of this measure measures be being measured with length is mutual independence, accordingly, the indication precision of bevel protractor and vernier is the indication precision of measure itself namely. When devising measure, should assure vernier only advocate the flank of feet and secondary scale tall, can make sure measure is measured so that dimension is the dimension crossing a line of the cone outside workpiece and end panel. But make an error as a result of existence, the centre of turning circle that machines the measure bend rule that give is not certain and accurate be located in two measure tool reference plane to hand in a line to go up. If set the actual centre of turning circle of measure bend feet,be null, and accordingly the null of demarcate vernier calipers (demarcate null) , criterion actual centre of turning circle and the deviation diagonal that design centre of turning circle spend measure the indication of feet does not have an influence, but have certain effect to the indication of vernier, expression is the null of null deviate demarcate when position of different point of view. For this, must undertake correction to null. If the graph is shown 2 times, establish measure actual centre of turning circle (demarcate null) distance of deviate vernier lateral is A, circumgyrate angle is Q, the correction of deviate demarcate null is) of direction of shift of C(edge vernier, criterion: C=AcotQ. It is to the correction of scale: C1=A1cotQ1: It is to moving the correction of feet: C2=A2cotQ2. The size crossing a line that sets workpiece cone and end panel is Ø , value of reading of vernier actual measurement is L, have: Ø=L-C1-C2. Graph the measurement that sketch map of deviate of 2 centre of turning circle designs centre of turning circle to reduce deviate of actual centre of turning circle and causes error, when machine and assembling measure, should strive for will actual centre of turning circle and the deviation that design centre of turning circle to adjust less than of design precision limit. Calculate through detecting, if measure the deviation value inside limits to maintain,be in micron class, do not need to amend: If the change of deviation value exceeded micron class range, need to give out according to the change of angle a group of correction. Correction is used at correcting null error, do not have an influence to the indication precision of measure itself, because this is when treatment production measure, although the actual centre of turning circle of bend feet and the deviate quantity that design centre of turning circle exceeded design precision requirement, also can calculate through detecting correction and add beforehand amend, in order to make sure the measurement of measure asks. The calibrating method of measure of method of 3 measure calibrating is as follows: Component of the Ⅰ of measure all-purpose bevel protractor undertakes calibrating by the relevant requirement of JJG33-79 of level of state of all-purpose bevel protractor. The cursor indication precision of measure vernier component (take no account of null error) the relevant precision that presses JJG30-92 of level of state of slide measuring implement asks to undertake calibrating. Before the deviation of actual centre of turning circle of feet of bend of measure of sketch map of 3 awl stage is pressed, the graph narrates null to amend a principle to undertake detect and be correctioned, the awl stand that makes 3 different measure for this need treatment (3) seeing a picture is provided as special check. Does awl stage machine precision to be: ? A0 of Qu of to joke of establish of rice huller Wa.

40µm, mesa and axes verticality 0.

01mm(dimension precision does not have requirement) . The real measure Ø1 that measures a 3 awl stage respectively with metric instrument, Ø2, Ø3, Q1, Q2, Q3: With actual measurement of this special measuring tool the diameter of 3 awl stage, measured value is written down respectively for L1, L2, L3. Be like Ø1-L1=Ø2-L2=Ø3-L3=0, make clear actual centre of turning circle and coincide of design centre of turning circle, and vernier null is accurate, do not need to amend: Be like Ø1-L1=Ø2-L2=Ø3-L3=Y, make clear actual centre of turning circle and coincide of design centre of turning circle, and vernier null deviation is Y, need to add correction Y: Be like ≤ of Y(of ≈ of Ø3-L3 of ≈ of Ø1-L1 ≈ Ø2-L2 0.

005mm) , show actual centre of turning circle and design centre of turning circle are basic coincide (deflection value is very little, can ignor) , and vernier null deviation is Y, also need to add correction Y: Be like Ø1-L1=Y1, Ø2-L2=Y2, Ø3-L3=Y3, and Y3 of ≠ of Y1 ≠ Y2, the value of Y2-Y1, Y3-Y1, Y3-Y2 is more than 0.

005mm, show cursor of edge of actual centre of turning circle is mobile and perpendicular centre of turning circle of directional deviate design is more, answer to part to undertake correction to null by different angle position. The actual centre of turning circle as a result of measure and demarcate 0 o'clock is certain, because this A is fair value. For computation Ø-L is worth, with 35 ° of Ø1, Q1(≈ ) proofread awl stage to decide an opposite null, criterion Ø1-L1=Y1, can push according to formulary C=AcotQ again derive as follows relation: Value of Ø-L=[(Ø2-L2)-(Ø1-L1)](cotQ1-cotQ)/(cotQ1-cotQ2)+(Ø1-L1) actual measurement and angle of correction data table (° ) set is worth (Mm) actual measurement is worth (correction of Mm) actual measurement (Mm) computation correction (Mm) correction error (Mm)368584.

786-0.

2140.

2140-0.

0190378584.

861-0.

1390.

1573-0.

0183388584.

909-0.

0910.

1033-0.

0123398584.

982-0.

0180.

0515-0.

0325408584.

998-0.

0020.

0020.

00 through detecting the real value of angle Ø , L, can calculate the correction that gives seat of different point of view. When be used actually, but according to be being measured cone angle is detected by metric room computation gives specific correction. Is if be opposite,the calibrating result of sample of a special measuring tool as follows: ? Persimmon of crooked big pool holding sb in respectful awe is taken an examination of be proud tell sparrow of male of adept of  of kang putting in order whoop  lights discretion of Hu Piao fine? to differ ≤ 0.

018mm) : The indication error of ② fixed bevel protractor and mobile bevel protractor all is ± 2: Error of ③ vernier indication is ± 0.

02mm: ④ set value is 85mm, if the actual measurement value when angle position is 36 ° , 37 ° , 38 ° , 39 ° , 40 ° respectively and correction data are expressed. By detect data is knowable, this measure gauges a demand through workpiece can be being satisfied completely after null error is amended. Actual production applies a circumstance to make clear, this measure can measure the cone workpiece of different specifications conveniently, measure compasses of efficiency take rough measurements to measure a law to rise significantly, shortened new product debugs time, made sure the product machines quality. This measure still can be used at the nodical dimension of end of test desk body, swallow and swallow end chamfer. CNC Milling CNC Machining