SET OF A T T A C H M E N T S FOR T E S T I N G U N I V E R S A L

M E A S U R I N G M I C R O S C O P E S

Eo B. I g n a t ' e v and M. E. K o t l y a r k e r UDC 531.'/13.8.089.62

The Ukrainian Republican Center of Metrology and Standardization (URTsMS) has developed in 1978 a set of attachments for testing universal measuring microscopes. *

The object of this work consisted of using the attachments and devices recommended in [1] and the exper- ience gained by the reading State Inspection Laboratories (LGNs) and industrial enterprises for modernizing exist- ing attachments and special measuring equipment, and preparing technical documentation for their ma~s produc- tion at the enterprises of the All-Union Association V/O "Etalon ' .

Considerable attention was paid in designing to the Universality of the attachments, i.e., to the possibility of using separate attachments for testing as many opticomechanical instruments as possible, to improving their utilization properties, and to reducing the mass of certain attachments.

Below we describe a set of the developed attachments intended mainly for testing universal microscopes.

Attachment for Setting the Templet Rule. It is used in testing the rectilinear movement of carriages in the hor- izontal and vertical planes (Fig. 1). The attachment is placed directly onto the supporting platform of the longi- tudinal carriage, with the special bolt 9 being set into the slot of the supporting platform 10, and the nut 8 used for fastening the attachment. The mass of the attachment fixed in this manner can be reduced considerably, since the stability of the attachment's position in the course of testing in this case is ensured not by its mass, but by means of the fastening component. The templet rule 6 rests against the two spherical supports 3 and the swing- ing knive-edge bearing 4, removed from the ends of the role to a distance of 0.21 of its length. The end stop 2 eliminates the possibility of setting the rule incorrectly. The screws 5 located above the supports at m angle of 15 ~ to the reference plane fasten the templet rule rigidly. It is set parallel to the carriage movement by ro-

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*This set is now on show at the Exhibition of National Economic Achievements (VDNKh).

Translated from Izmeritel 'naya Tekhnika, No. 12, pp. 35-36, December, 1975.

�9 1976 Plenum Publishing Corporation, 227 West 17th Street, New York, IV. Y. I0011. No part o f this publication may be repro- duced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, micro- filming, recording or otherwise, without written permission of the publisher. A copy o f this article is available from the publisher

for $15.00.

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A

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iI View A

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Fig. 2 Fig. 3

taring the frame '/, to which the rule is fastened, about its spherical support II. The three screws i set the tem-

plet rule in space.

Attachment for Setting the Optimeter Tube and the Indicator on the Main Microscope's Barrel (Fig. 2). The

application of this attachment excludes any dismantling of the microscope (it is not necessary to unscrew the ob- jective) or the marking-off device in the old-model microscope. This is attained by using the special nut 2, which has a slot for fitting onto the main microscope objective's mounting 3. The attachment comprises a set of nuts the width of whose slots corresponds to the external diameter of the tested microscope objective's mounting. The clamping binder posts 5 and q make it possible to utilize the attachment both with the optimeter tube I and a gear and lever head. Moreover, by using a special adaptor it also becomes possible to work with a 2qC.za diameter

optimeter tube. The special bolts 6 set in the holes of the head are intended for ~xing the binder post with the

indicator 4 in two mutually perpendicular positions.

A considerable reduction in the mass of the attachment was achieved by using aluminum alloys for the

majority of its components.

Attachment ,for Setting the Optical Quadrant. It is intended for checking whether the scale readings correspond

to the actual slope angle of the microscope column (Fig. 3). This attachment has many advantages as compared

with those used at present. It can be set without removing the bracket with the main microscope's barrel. This attachment's design is such that it can be employed with all the universal and instrument microscope types. This has been attained by using an adjustable guide of the "swallow-tail" type. The adjustment is achieved by placing the clamp 1 in the corresponding slot of the guide 2. In its displacement along the slot the clamp 1, which is made in the form o f a flat spring with an attached cover plate, can set itself in a position depending on the angle between the guide and tested microscope's column 7. The optical quadrant 6 rests on three spherical supports 3 and is secured with the nut 5 by means of the clamp 4. Owing to the strict requirements With respect to the posi- tion of the component's surface, the required parallelism between the quadrant's ampoule axis and the sloping plane of the microscope column is maintained. The attachment's design is suitable for setting a quadrant with a magnetic base.

The set also includes special measuring means, consisting of try-squares, rollers for testing the coaxiality of centers, and the height of the center line, a polyhedron, and a templet rule. The design of these appliances has not been radically changed; nevertheless some of them have their particular features. Thus, the try-square for testing the perpendicularity of the barrel axis to the supporting surfaces of the longitudinal carriage displaced along the column guides and, in addition to its certified angle of 90** 15 u between its base plane and its outside face, is also provided with a certified angle of 90~ between the base plane and its internal face. This makes it possible to use the try-square in testing height gauges, i.e., in testing the perpendicularity of the measusing plunger travel to the plane of the height-gauge table. This complication is completely justifiable, since the set of a universal measuring microscope may include the height gauge.

Inorder to reduce the attachments' mass, the templet rule is made hollow and the polyhedron with a shortened working face, but without reducing its required ridigity and stability of dimensions.

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The rollers used for checking the coaxiality of centers and the height of the center line also have their particular features. They are made in the form of hollow cylinders whose ends are capped by means of a glued sliding fit with bushings which are provided in one instance with center holes and in the other with centers. More- over, all the machining operations and the lapping of centers and external certified surfaces are carried out after assembly. Such a design serves to concentrate the main mass of metal at the ends, thus reducing the sagging of the roller's middle.

All these attachments were tested in the URTsMS laboratory of linear and angular measurements. It is al- ready possible to state with confidence, after only a relatively short experimental utilization, that all the devel- oped attachments are viable, some of them raise the productivity of testing, and most of them are universal, thus reducing the required number of testing attachments. The location of the entire set in a wooden case whose mass together with the tmiversal measugng devices (including the optimeter tube) amounts to 9 kg provides un- doubted advantages when the testers' work entails traveling.

LITERATURE CITED

1. Instruction 106-55 on Testing Universal Measuring Microscopes [in Russian], Izd. Standartov, Moscow(1965). 2. E.B. Ignat'ev and M. E. Kotlyarker, Izmeritel ' . Tekh., No. 1 (1974).

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