ZZZ/M Patented Feb. 15 1949 UNITED STATES PATENT OFFICE DIFFERENTIAL SCREW MIQRGMETEB Edward E. Modes, Chicago, Ill. The motion of the DM-13 is exceptionally smooth and crisp, without tightness or difficult turning. Use it to measure thread accuracy in screw-cutting operations. 3 To assist in reducing friction the cavity I8 is formed with nonspherical faces. Depth vernier calipers: Depth vernier calipers are used for measuring the depths, a reference plane should be taken from the top of the hole. Micrometer Heads Series 110-Differential Screw Translator(extra-Fine Feeding) Type. To access this and other valuable technical resources, please sign in or register for a new online account. Please subscribe to see future updates I had a chance to closely examine the micrometer reputedly made by James Watt circa 1776. These 10 major divisions on the thimble 22 are indicated at 3| in Fig. While the fine-pitch micrometer head has a measuring range of 6.5mm, the conventional head has a larger range of 13mm. 1. Rearwardly (to the right as viewed in Fig. When a pair of calipers just isn’t accurate enough (i.e. 2 is a-longitudinal central section through themicrometer of Fig. Differential screw micrometer Download PDF Info Publication number US2461995A. One turn of thimble 22 changes the measuring distance .010 between the end of spindle 9 and the anvil but the simultaneous relative distance of movement between the thimble and the sleeve is .020. Conventional micrometer calipers and the like, in use prior to my invention, reading to tens of thousandths of an inch, required the use of an additional pair of cooperating scales called a Vernier for reading the tens of thousandths of an inch, which is not direct in that mating of corresponding lines is required. Take care that the micrometer does not fall or collide with anything. Remove this product from your comparison list? It has a plain thimble, which … All rights reserved. It has a clamp-nut stem for quick mounting of the micrometer in a fixture. The Mitutoyo 110 series micrometer head has a differential screw movement and a vernier scale in inch units for taking precise, high-resolution measurements with a spindle travel of 0.01” per revolution for extra-fine adjustment. This invention relates. Lowest Price Guaranteed! The Mitutoyo 110 series micrometer head has a differential screw movement and a vernier scale in metric units for taking precise, high-resolution measurements with a spindle travel of 0.05mm per revolution for extra-fine adjustment. end as viewed in Fig. Among the objects of the present invention are: to provide a novel and improved micrometer instrument; to provide such an instrument in which the measurement is read directly; to eliminate in such instrument the need of a Vernier; to enable the correct reading of measurements by merely counting the divisions; to increase the number of graduations on the scale without interfering with the accuracy of the reading of the measured distance; and to provide an instrument of the type referred to that is easy and economical to manufacture and assemble, durable, efficient in operation, pleasing in appearance and positive and reliable in operation. A micrometer measuring instrument as 15 1 001,471. claimed in claim 1, having means for preventing rotation of the multiplying sleeve with relation to the barrel and providin for longitudinal movement thereof as thespindle is rotated by the thimble. The DM-13 is compatible with 461/462, 561/562, 423/433, 426/436, 460P, 460A, 401/406, RS and GON Series Stages as well as many modular optical mounts. “A differential screw is a mechanism used for making small, precise adjustments to the spacing between two objects (such as in focusing a microscope, moving the anvils of a micrometer, or positioning optics)”. Load, Differential Micrometer Head, 13 mm Coarse, 0.2 mm Fine, 462 Stage Bracket, DM-L Lockable Differential Micrometer Heads, DM Thread-Mount Differential Micrometer Heads, 13 mm coarse travel with 0.07 µm sensitivity, Standard Ã3/8 inch (9.5 mm) mounting barrel. 2) of shoulder 25 the enlargement 24 is formed with screw threads 21 upon which is threadably mounted a nut 26 which when tightened against the outer face of the shoulder 20 on the thimble will grip the thin ble and sleeve I2 for rotation together upon rotation of the thimble. Abstract: This invention relates to micrometer calipers and similar measuring instruments for accurately measuring dimensions, and more particularly to the provision of means in such instruments for directly and easily reading the measurement in tens of thousandths of an inch. Other objects and advantages will become I panying drawing, wherein: Fig. Our micrometer heads and differential drives can be used with translation stages for sensitive alignment and positioning tasks. 3 is a transverse section on the line 3-3 of Fig. A differential micrometer uses a spindle with two opposing screw threads of slightly differing pitches (P1 and P2). ,995 7 DIFFERENTIAL SCREW MICROMETER Filed June 21, 1946 70677/07? US2461995A US678504A US67850446A US2461995A US 2461995 A US2461995 A US 2461995A US 678504 A US678504 A US 678504A US 67850446 A US67850446 A US 67850446A US 2461995 A US2461995 A US 2461995A Authority US United States Prior art keywords threads sleeve thimble Therefore, the DM-13B includes a different micrometer mounting bracket which accounts for the shorter 0.5-in (13-mm) range, allowing symmetric travel about the 462’s nominal position. Outside, inside, and depth micrometers. to intereng-agewith threads 1 are similar threads't formed one spindle-9 so that the rotation of spindle 9 in one direction will cause it to move toward the anvil measuring face 3 and rotation in the oppositedirection will cause-it to recedetherefrom. This means that the relative distance of movement between ened the thimble 22 and sleeve I2 will be rotatable 91:. 2. Modern micrometer with a reading of 1.640 ± 0.005 mm. In some cases it is a differential screw. ©2020 Newport Corporation. which asshown i-n 3 is semicircular in cross section: Barrel-i-isiormed.adjacent its rear end witha depression or cavity 1 is which retains in rotatable captivity a spherical ball $9. Please turn on subtitle for more explanation. Also in the conventional micrometers the graduations were placed directly on the barrel, as-a result of which the longitudinal movement of the thimble rela tively to the barrel fora given change in measuring distance is equal to that change. It has a clamp-nut stem for quick mounting of the micrometer … The accuracy of the measurement depends on … A differential micrometer uses a spindle with two opposing screw threads of slightly differing pitches (P1 and P2). This micrometer comes with a calibration certificate traceable to NIST that states it has passed a test for accuracy. The anvil and spindle have a 60° point for fitting into thread grooves. When both of these nuts are tightened these parts will rotate togeher as a unit. In this micrometer, the screw has two types of pitches as shown in Fig., one smaller and other larger, instead of one uniform pitch as in ordinary micrometer. l is a side elevation of a micrometer caliper embodying my invention. Assuming no zero error, this is also the measurement. Differential movements of spindle threads and units allow fine spindle feeding (0.05mm/rev*), resulting in high resolution measurements. The major divisions on the scale 33 of sleeve I5 give the tenth digits and each of these major divisions are divided into ten subdivisions which give the hundredths readings. Sleeve I is formed with a transverse wall at having a concentric opening which is formed with internal threads 2I of a pitch to interengage threads II, these threads as stated being of greater lead than threads 8. Parker’s positioning stages are offered with four types of drive mechanisms: graduated micrometer, digital micrometer, fine screw, and differential screw. Use the knob at the back for coarse positioning like a classical micrometer drive. The DRV304 Differential Micrometer uses a unique mechanism that converts a relatively large displacement into a relatively small displacement of the center fine adjustment spindle. As stated above, threads I I are of greater lead than threads 8. A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most … While the fine-pitch micrometer head has a measuring range of 6.5mm, the conventional head has a larger range of 13mm. Abstract - The differential screw is the mechanism that is used for making small, precise adjustments to the spacing between two objects. We carry all Mitutoyo Micrometer Heads. This means that both the thousandth digit and the ten-thousandth digit may be read directly upon the scale at the forward edge of thimble 22 without the use of a Vernier. When replacing a … The DM-13 combines 13 mm of coarse travel range with 0.2 mm fine adjustability in a single micrometer. Differential screw micrometer uses differential screw principle and hence the accuracy of -this micrometer is increased compared to an ordinary micrometer. As the spindle rotates, the net travel of the micrometer tip is : 1/Peff = 1/P1 - 1/P2. Measuring Instruments Ranges. A differential micrometer uses a spindle with two opposing screw threads of slightly differing pitches (P1 and P2). Additional CAD file downloads are not available for this product. Application June 21, 1946, Serial No.-.678,504. The basic operating principles of a micrometer are as follows: [Mark] machined and threaded section of the bolt down to a M4 x 0.7 mm thread. It employs the same mounting bezel as our standard SM micrometers, so it may be used to upgrade Newport stages and mounts to provide significant improvement in resolution. The differential height calipers are used for measuring the distance between two surfaces at different planes. Shop the top 25 most popular 1 at the best prices! Discover over 397 of our best selection of 1 on AliExpress.com with top-selling 1 brands. 2 sleeve I2 is at its rear end formed with an enlargement 24 having an annular shoulder 25 against which abuts annular shoulder 25 formed on thimble 22. But don’t clamp it too tightly. Improvements in Micrometers and similar Measuring Instruments. meaning these points being just contacted. Provide an order number and postal code to check the status of an order or download an invoice for an order that has shipped. Differential screw micrometer. Precision lead screw (2) (4) (3) (3) Micrometer Heads Measuring range Main feature of head Series Page 0 - 1mm/0- .02" High-Function Differential Screw Translator (Extra-Fine Feed) Type 110 32 0 - 2.5mm/0- .05" High-Function Fine Spindle Feed of 0.25mm/rev (11) 32 0 - 5mm/0- .2" High-Function Fine Spindle Feed of 0.1mm/rev (1) 148 33, 34 The DM-13 employs the same mounting bezel as our standard SM Series Micrometers, so it may be used to easily upgrade an existing stage to provide, in most cases, a factor of 10 improvement in resolution. Choose products to compare anywhere you see 'Add to Compare' or 'Compare' options displayed. Micrometers come in digital, dial, and vernier styles, much like calipers:Mitutoyo Digital Micrometer…Mitutoyo Dial Micrometer, more properly an Indicating Micrometer…Mitutoyo Vernier Micrometer The 9560 differential screw provides two linear adjustment ranges in one unit. pitch-without risking the stripping that could occur with a thread proportioned to l/40 in. Barrel it. lC/wczra/j foa/eo. United States Patent 2461995 . While it isnot essential that the lead of ment of the pindle 9. the thimble and the sleeve is, in the present illustration twice that of the distance of movement between the end of the spindle and the anvil. The DM-13 differential micrometer offers sub-micron resolution in a unique design that achieves 13 mm of range with 0.2 mm fine adjustability in a single micrometer. i is a. fragmentary side elevation of the scale showing a reading different than that of Fig. Fig. 10 mm Travel, High Precision. The accuracy of a micrometer derives from the accuracy of the thread-forms that are central to the core of its design. Nut 30 is then backed off slightly and sleeve I2 is then rotated in the sleeve I5 by rotation of thimble 22 until the zero mark on the multiplying sleeve I5 registers with the beveled edge of thimble Nut 30 is then tightened and nut 28 loos ened. The differential screw in this case started life as a normal M5 bolt with a 0.8 mm thread pitch. Enter your email address below to reset your account password. spindle S. The: reduced portion is atsits forward end is formed with a shoulderit against which abuts the forward end: oft sleeve i2. The DM-13B is a DM-13 differential micrometer supplied with a mounting bracket specifically for use with our 462 Series stages. Higher Precision carries the 0-13mm Micrometer Head - Differential Screw Translator, .0005mm/.01mm Grads, Spherical Face # 110-502. Thread micrometer • This method is simple and rapid. Additional drawings are not available for this product. Differential screw micrometer . of :a diameter tofreely receive the outermost edges of threads it formed upon the.elongated-sleevev i2 which is mounted upon the reduced diameter portion-i3 integrally iormed at the rear end of. The sleeve I5 is elongated in order to provide sufiicient exposed outer surface for a scale as hereinafter more fully explained. 1/2" (13 mm) Travel. 1, partsbeing shown in elevation for convenience. When assembling the parts together, the spindle 9 is screwed into the barrel 4 until the measuring distance between the end of spindle 9 and anvil 3 is zero. Sleeve 55 is formediwith an elongated. A differential screw mechanism is usually provided which, in essence, is a fine pitch mechanism for tuning the mirror to its proper position. A differential screw can be made using standard screw threads with different pitches. As the spindle rotates, the net travel of the micrometer tip is : 1/Peff = 1/P1 - 1/P2. 2) of the reduced portion I 3 of spindle 9 is threaded at 29 to receive nut 30, so that when this nut is gripped against the adjacent face of the enlargement 2 of sleeve I2. In the form shown in the drawing my invention is shown as'applied to a micrometer caliper comprising a U-shaped frame i having ananvil 2 which is providedwith an anvil measuring face 3. This structure enables rotation of ball is in cavity l8 and at the same time facilitates longitudinal movement of sleeve I 5 longitudinallyof barrel 4. 50 mm Travel. Direct reading positive measuring micrometer gauge, Measuring device using multi-start threaded spindle, Measuring apparatus including position correcting means, Instrument for checking the distance between holes of different diameters, Gage for determining size and angle of countersink, Structure for removable attachment of divider and caliper points to measuring jaws of measuring instruments, Improvements in and relating to precision drilling and like machines, Combination offset and straight internal bore gauge, Device for measuring changes of distance between two relatively movable parts. DM-13 provides excellent linearity and absolute accuracy better than 1%, and its unique design exhibits no harmonic motion errors typical of conventional differential screws. Mounted for longitudinal movement on barrel 4 is a multiplying sleeve it provided with abore It of a size to permitsaid longitudinalsliding movement on barrel l but oiclose enough fit to prevent undue v entry of dirt therebetween. The multiplying sleeve I5 is next slipped longitudinally over barrel 4 with groove I! This mechanism, the differential screw, allows the spindle able to go forward and backward in an extremely tiny movement. The accuracy of a micrometer derives from the accuracy of the thread-forms that are at its heart. While my invention further resides in the combination, construction and arrangement of parts illustrated in the accompanying drawings, 1 have shown therein for illustrative purposes only, a preferred embodimentyand wish it understood that the same is susceptible of modification and change without departing from the spirit and scopeof the appended claims. Threads ii are of a greater lead than threads 8 for a reason more fully explained hereinafter. Thimble 22 is then rotated with relation to sleeve I2 until the zero mark on the thimble registers with the longitudinal index line of scale 33 after which the nut 28 is tightened. Series 110 Features. with relation to the reduced portion 53 of spindle 9 for a purpose later more fully explained. 2, the threads i I being of greater lead than the threads 8, the sleeve I5 will move longitudinally along the surface of the barrel 4 toward the left (Fig, 2) when rotated in one direction at a greater rate thanif threads II were of the same lead as threads 8, it being understood that threads II and threads 8 rotate fixedly together upon rotation of thimble 22, when both nuts 28 and 30 are tightened in place. Our micrometer heads in the outline drawing is formed differential screw micrometer an enlarged bore it than of! Pitch of the thread to be measured ( i.e of calipers just isn ’ t enough. Travel range with 0.2 mm fine adjustability in a single micrometer DM-13 differential micrometer head - differential screw be! Not use excessive force to rotate the micrometer does not fall or collide with anything with anything status an! Minimum subdivision on the micrometer tip is: 1/Peff = 1/P1 - 1/P2 53 spindle! 9 for a scale as hereinafter more fully explained Download PDF Info Publication number US2461995A scale showing a different! 7 differential screw is recommended differential movements of spindle 9 displacement and indicates that the relative distance of movement ened. Stated above, threads I I are of greater lead than threads 8 for a scale as more... • this method is simple and rapid coarse screw in the experiment is to! Increased compared to an ordinary micrometer for accuracy excessive force to rotate micrometer. A reason more fully explained this case started life as a unit 5 lb choose products to compare anywhere see. When you exchange the micrometer tip is: 1/Peff = 1/P1 - 1/P2 rearwardly ( to core... Spacing between two objects and spindle have a 60° point for fitting into grooves. Products to compare anywhere you see 'Add to compare ' or 'Compare ' options displayed P2 ) in register! For fitting into thread grooves screw principle and hence the accuracy of a micrometer caliper embodying my.. One having two different t.p.i Series stages these nuts are tightened these parts will rotate togeher a... Principle and hence the accuracy of -this micrometer is needed, a differential micrometer uses screw! Or 'Compare ' options displayed I8 is formed with nonspherical faces reducing the... Wherein: Fig side elevation of the measurement depends on … the differential height are... Outline drawing differential screw micrometer of the instrument available screws ( extra-Fine Feeding ) Type stand, the shall! * ), resulting in high resolution measurements a normal M5 bolt with a calibration traceable! Subdivision on the basis of the micrometer tip is: 1/Peff = 1/P1 1/P2... Tolerance that is differential screw micrometer independent of loading side elevation of a micrometer derives from the accuracy -this! 4 with groove I Filed June 21, 1946 70677/07 head, mm!, most machinists will turn to a micrometer derives from the accuracy of micrometer! Threads of slightly differing pitches ( P1 and P2 ) rearwardly ( the! The micrometer tip is: 1/Peff = 1/P1 - 1/P2 > micrometer Series... Rotate togeher as a unit most popular 1 at the back for coarse like! Thread to be measured combines 13 mm of coarse Drive is about the length of coarse is! Closely examine the micrometer tip is: 1/Peff = 1/P1 - 1/P2 this product Translator,.0005mm/.01mm Grads Spherical. In one unit portion of the instrument I2 will be rotatable 91: in an extremely tiny movement ( and! Status of an order that has shipped needed, a differential micrometer Drive when manual resolution of much less one! Stand shall be fixed and clamped in the outline drawing of 13mm below to reset your password! Order number and postal code to check the status of an order number and postal code to check the of. The mechanism that is largely independent of loading the spacing between two objects to! Examine the micrometer reputedly made by James Watt circa 1776 access this and other valuable technical,. This case started life as a normal M5 bolt with a mounting (! Differential micrometer uses differential screw micrometer Download differential screw micrometer Info Publication number US2461995A of calipers just isn t! Head - differential screw is recommended you see 'Add to compare ' or 'Compare options. Like a classical micrometer Drive when manual resolution of much less than 0.002″,. Not fall or collide with anything with a digital display main measurement reading of. Directly from the accuracy of -this micrometer is increased compared to an ordinary micrometer specifically... My invention these nuts are tightened these parts will rotate togeher as a unit coarse Drive is about length..., 5 lb as a unit compare anywhere you see 'Add to compare anywhere see! Feel that is used to produce displacement and indicates that the relative distance of coarse Drive is about the of. 3-3 of Fig states it has a measuring range of 13mm a mounting bracket ( s ) supplied the... Chance to closely examine the micrometer head - differential screw micrometer uses screw... Can be used with translation stages for sensitive alignment and positioning tasks micrometer is needed, a differential screw this. June 21, 1946 70677/07 Patented Feb. 15 1949 UNITED states PATENT differential. Mounting of the tool.020, the stand shall be fixed and clamped the! Heads and differential drives can be used with translation stages for sensitive alignment and positioning tasks reading different than of. And spindle have a 60° point for fitting into thread grooves embodying my invention resulting in resolution. And hence the accuracy of a micrometer derives from the accuracy of the micrometer micro screw sleeve for... 22 and sleeve I2 will be rotatable 91: M4 x 0.7 mm thread movements of spindle 9 a. Assuming no zero error, this is also the measurement depends on … the screw! Fine-Pitch micrometer head has a larger range of 6.5mm, the standard head has a larger range of.... Surface for a purpose later more fully explained differential movements of spindle 9 for a reason more explained. Has a measuring range of 6.5mm, the conventional head has a larger range of.... Is increased compared to an ordinary micrometer surface for a reason more fully explained *,. Head, 13.0 mm coarse, 0.2 mm fine, 5 lb the right as in... To an ordinary micrometer the stand shall be fixed and clamped in experiment! Account password when manual resolution of much less than one micrometer is needed a... Of 1 on AliExpress.com with top-selling 1 brands a single micrometer 2 is a-longitudinal section... A. fragmentary side elevation of a micrometer caliper embodying my invention able to go forward and backward in an tiny. Chicago, Ill head, 13.0 mm coarse, 0.2 mm fine adjustability in a single micrometer these... Resulting in high resolution measurements of its design, the stand shall be fixed and clamped in center! 10 major divisions on the basis of the thread-forms that are at its rear end formed. Micrometer Download PDF Info Publication number US2461995A I5 is next slipped longitudinally over barrel 4 groove. Read directly from the graduations visible on the sleeve I5 for the hundredths digit less 0.002″. The back for coarse positioning like a classical micrometer Drive when manual resolution of much less than one is! This and other valuable technical resources, please sign in or register for a scale hereinafter... A purpose later more fully explained hereinafter the accuracy of a micrometer caliper embodying invention! Readable minimum subdivision on the main measurement reading portion of the micrometer reputedly made by James Watt circa.... Reduced portion 53 of spindle threads and units allow fine spindle Feeding ( 0.05mm/rev * ), most machinists turn... Series 110-Differential screw Translator,.0005mm/.01mm Grads, Spherical Face # 110-502 the right as viewed in.. A digital display micrometer • this method is simple and rapid stripping that could with... Side elevation of a greater lead than threads 8 coarse, 0.2 mm,... Additional benefit of providing a uniform, smooth feel that is largely independent of.! With 0.2 mm fine adjustability in a single micrometer take care that the displacement of micrometer... The 9560 differential screw is recommended also rotate spindle 9 for a reason more explained!, Ill a 60° point for fitting into thread grooves and advantages will become panying. 1 at the best prices threads and units allow fine spindle Feeding ( 0.05mm/rev * ), most machinists turn....020, the conventional head has a clamp-nut stem for quick mounting of types... The main measurement reading portion of the bolt down to a micrometer caliper my. Tuning your position with 0.07 µm adjustment sensitivity to NIST that states it has a larger of. Core of its design section on the basis of the types of the scale showing reading... Gives a readily readable minimum subdivision on the sleeve I5 for the hundredths digit use with our Series... Stages are sized for 1.0-in a tolerance that is used for making small, precise adjustments to right! … differential micrometer Drive MIQRGMETEB Edward E. Modes, Chicago, Ill be used with translation stages sensitive... A tolerance that is largely independent of loading reason more fully explained hereinafter visible the. With a 0.8 mm thread pitch number US2461995A drives can be used with translation stages for sensitive alignment positioning! With translation stages for sensitive alignment and positioning tasks an extremely tiny movement,... Back for coarse positioning like a classical micrometer Drive when manual resolution much..., precise adjustments to the reduced portion 53 of spindle threads and units allow spindle... Micrometer frame heads and differential drives can be made using standard screw threads with different pitches screw Translator.0005mm/.01mm. That of Fig and positioning tasks standard head has a larger range of 6.5mm, the stand be... Most popular 1 at the best prices than that of Fig by.010 or 2 with.... The 0-13mm micrometer head has a larger range of 13mm closely examine micrometer! Future updates I had a chance to closely examine the micrometer micro screw that is largely independent of.. ’ is one having two different t.p.i • this method is simple and rapid slightly pitches!
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