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Volume 28, Issue 329
Displaying 1-8 of 8 articles from this issue
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Measurment of the radius to the lace-way from the axisZenzaburo MURASE1962 Volume 28 Issue 329 Pages 309-316
Published: June 05, 1962
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn this Part 3, the measuring method of the radius from the screw axis to any point on the lace-way surface of the nut or the threaded shaft of the ball screw is reported. There are many reports on the measuring method about the triangular hericoidal surface, but rather few about generalized hericoidal surface.
Here is reported a measuring method on latter and its theoretical calculation.View full abstractDownload PDF (1202K) -
On the effect of lap groove angle in lapping steel ballsMamoru IDO, Ryo NAGATA, Tsutomu HAZI1962 Volume 28 Issue 329 Pages 317-323
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn lapping of steel balls, the ball motion mechanism is influenced by groove angle on lap disk. This also depends on kinds of lapping compound, lap materials and so on. But we investigated the effects of lapping quantity, sphericity of balls and cutting resistance caused by changing lap groove angle and lapping pressure and maintaining other conditions constant : that is definite lapping compound, its supplying method, lap material, etc.
Then we reached following conclusion by comparing theoretical analysis with experimental results.
(1) Lapping quantity varies considerably according to groove angle, and lapping quantity in the case of unsymmetry angle becomes larger than in the case of symmetry angle with same magnitude. Also, this tendency decreases under high lapping pressure (more than 100 gr./piece).
(2) In the case with symmetry groove angle, the ratio of lapping effect in each contact point between steel ball and lap disk is as follows.
A : B: C=1 : 1.7 : 1.5
(3) Smaller the magnitude of groove angle, the sphericity of balls becomes better, and the effect depending on symmetrization is more inconsiderable.View full abstractDownload PDF (1168K) -
Genrokuro NISHIMURA, Tomio KOTAKI1962 Volume 28 Issue 329 Pages 324-330
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe electrical contact type governers are widely used as the velocity control mechanisms for micro-motor. The chief factors effective for the behaviour of this type governer are composed of (1) vibration of its pendulum system, (2) inductance of the motor coil, (3) electrical resistance of the contact point, and also (4) vibration of the motor shaft.
In this paper, are mainly studied by theoretical treatment of the problems concerning to the rotation velocity control accompanied with the vibration phenomena of the governer pendulum system. For the respective variations of the source voltage and the load applied to the motor, both the average rotation velocity of the motor and the pendulum amplitude. of the governer system are able to be calculated quantitatively when both of the electric elements of the motor and the constructive elements of the governer are given. The theoretical results thus obtained are also confirmed to be reasonable by experiments.View full abstractDownload PDF (1214K) -
Hidehiko TAKEYAMA, Ryozi MCRATA1962 Volume 28 Issue 329 Pages 331-337
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSTitanium is a material hard to machine. The machinability of commercially pure titanium ST 60 is investigated experimentally from various standpoints, that is, chip formation, cutting force, tool wear, tool life, etc. The machinability in terms of chip formation and cutting force is better than ordinary ferrous materials, whereas the machinability of tool wear or tool life is extremely poor although the cutting temperature is not so high.
This will be attributed to its extraordinary chemical activity and thus considerable welding to a tool material.
Based upon the extensive tool life tests, the most suitable tool material (K 10), the most adequate tool shape (-5° side rake angle) for turning titanium have been selected, the effects of feed, depth of cut, cutting speed, machining atmosphere, etc. being investigated to establish the machining standard.View full abstractDownload PDF (1403K) -
Hidehiko TAKEYAMA, Tsutomu YATO, Umetaro KASUYA, Teiji YOSHIKAWA1962 Volume 28 Issue 329 Pages 338-351
Published: June 05, 1962
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThis report is only the introduction of the project to establish the machining standards for various important metals specified by the Japanese Standard. The major items of the test are selection of carbide grade, tool shape, speeds, and feed for turning typical five grades of plain carbon steels, and close investigation of the tool life from the viewpoint of both flank wear and crater.
According to the test result, crater wear is the most serious problem in turning the carbon steels. Therefore, every effort should be made to control crater wear in selecting the best carbide grade, tool shape, cutting conditions, etc.View full abstractDownload PDF (3159K) -
Naoharu KINOSHITA, Tadaaki HANAOKA1962 Volume 28 Issue 329 Pages 352-356
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSResinoid grinding wheels are often used in wet grinding operations. However, resinoid bond is most susceptible to the weakening action of the alkali of the grinding fluid.
The experiment has revealed that the strength of the wheel reduced to 50% of its dry value when soaking 80 grit test bar in 0.1% alkali solution for 1 hour in 80°C. The decline ratio of the strength of wheels varies with soaking time, liquid concentration, liquid temperature, etc. The decline of the strength becomes to softening of the wheels, and leads wheel wear greatly.View full abstractDownload PDF (837K) -
1962 Volume 28 Issue 329 Pages 357-363
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1404K) -
1962 Volume 28 Issue 329 Pages 365-367
Published: June 05, 1962
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (631K)
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