CA1165552A - Micro-adjusting cartridge for cutting tool - Google Patents
Micro-adjusting cartridge for cutting toolInfo
- Publication number
- CA1165552A CA1165552A CA000380299A CA380299A CA1165552A CA 1165552 A CA1165552 A CA 1165552A CA 000380299 A CA000380299 A CA 000380299A CA 380299 A CA380299 A CA 380299A CA 1165552 A CA1165552 A CA 1165552A
- Authority
- CA
- Canada
- Prior art keywords
- leg
- bore
- cartridge
- insert
- legs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/056—Differential screw threads
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
ABSTRACT
A tool cartridge to be fastened to a boring bar for line boring operations comprising a pair of split legs on the tool cartridge. Each leg has an insert with a threaded bore having a different pitch. A
differential screw comprising two threads on the shaft corresponding to the two different threaded bores on each insert effects a micro-adjustment of the radially moveable leg on the cartridge holding the cutting tool when the differential screw is rotated.
A tool cartridge to be fastened to a boring bar for line boring operations comprising a pair of split legs on the tool cartridge. Each leg has an insert with a threaded bore having a different pitch. A
differential screw comprising two threads on the shaft corresponding to the two different threaded bores on each insert effects a micro-adjustment of the radially moveable leg on the cartridge holding the cutting tool when the differential screw is rotated.
Description
~ ~5552 The present invention relates to a ~etal cutting tool, and more particularly, to a boring tool having a micro-adjusting means for adjusting the cartridge holding the tool.
Previous inventions provide for ad; U5 ting the cutting tool such as disclosed in -the following United States Paten-ts: Eversole 3,801,213, Guli~on 3,765,7~8, Keller 4,105,360 and Shutz 2,266,339; and Russian Patent Samoilov 460,119.
However, the prior art fails to provide for adjusting the cutting tool in small or micrometer increments.
According to the present invention there is provided a tool cartridge attachable to a boring bar, there being provided a ~ight portion, a pair of legs extending from the bight portion in spaced apart, side-by-side relation with each leg having a threaded bore means, one of the legs being adapted for abutment against the boring bar when the cartridge is attached thereto and the other of the legs carrying cutting means thereon for cutting engagement with a workpiece when the one leg is abutted against the boring bar and the other leg is movable relative to the one leg. Screw means is received in the t~readed bore means of the legs connecting the legs such that rotation of the screw means moves the other leg and cutting means carried thereon relative to the one leg to adjust cutting diameter. Means is provided for attaching the cartridge to the boring ~ar.
In a specific em~odiment of the invention, the threaded bore means of the legs extend transversl~ across the legs in axial alignment with one another, the threaded bore means of the one leg and the other having different pitch threads. A screw, which has corresponding different pitch threads, is ~k ~ L65~35~
inserted through both legs of the cartridge. As the screw is turned, ~he two halves or legs of the cartridge tend to move away or close~ The movement of the cutting tool mounted on one of the legs o the car~ridge is radially adjusted depending upon the diEference between the two threads per inch tapped in each leg of the cartridge and ~orresponding threads on the differen-tial screw.
BRIEF DESCRIPTIO~ OF THE DRAWINGS
Fig. 1 shows part o a boring bar with the cartridge in place, and the radially adjustable cuttiny tool secured thereto;
Fig. 2 shows a cross-section of the boring bar and the cartridge, taken along line 2-2 of FigO 1;
Fig. 3 is a view taken along line 3-3 of Fig. 1;
Fig. 4 is a plan view of the bronze or steel insert;
Fig. 5 is the end view of the ~ronze or steel insert insert~
: Fig. 6 is a plan view of the differential screw showing different threads per inch thereon.
3~ DESCRIPTION OF T~E INVENTION
With reference to ~ig. 1 and Fig. 2, the portion of the boring bar 10 shows a recess 12 and a threaded bore 13 which provides the cartridge 14 to be fastened or secured thereto by a bol~ 16~ The ~artridge 14 has a bight portion 18 and two legs 20 and 22 separated by a recess 24. The reoess 24 terminates in a bore 26 ~ ~ ~ 5 t~
to provide resilient movement of the legs 20 and 22 of cartridge 14. Interconnecting the two legs ~0 and 22 is a recess 30. A bore 32 is reamed perpendicular to recess 30 to accomodate bronze or stee:L inserts 36A and 36B (shown in Fig. 4 and Fig~ 5)0 In operation the sub-assembly bronze or steel insert comprise semi-circular halves 36A and 36B which are dropped in the reamed bore 3~ of the cartridge 14. The bore 40A in bronze or steel insert 36A is threaded to a pitch that is different than the pitch in threaded bore 40B. For example, the preferred embodiment shows that the threaded bore 40A is ~6-40, the pitch being 1/40; and the threaded bore 40B is ~10-32, the pitch being 1/32.
The pitch difference between 1/40 and 1/32 is approx-imately .006 thousands of an.inch ~.031-.025j. The pitch is defined as the distance, measured parallel to its axis, between corresponding points on adjacent threads in the same axial plane.
A differential screw, shown in Fig. 6, incorporates two different tapped threads 46A and 46B in the same direction. That is, both tapped threads are either right hand or left hand threads. In the preferred embodiment, one thread is tapped #6-40 and the other thread is tapped #10-32~ The dif~erence between the--two differen~ pitches provides the motion or radi.al movement; for example, 40 threads per inch provides motion of 1/40 or .025 thousands of an inch, and 32 threads per inch provides a motion of 1/32 or .031 thousands of an inch. The two pitch dimensions are subtracted providing a difference of .006 thousands, the difference throu~h which the two semi-halves bron~e or steel inserts 36A and 36B start separating or coming together as the differential screw is being rotated or turned.
Thus, according to the preferred embodiment, the differential screw is inserted through the bores of 5 ~ ~
inserts 36A and 36B with the threads both right hand as defined above, and as the differential screw 44 is turned cloc~wise the bronze or steel inserts 36A and 36B are moved away rom each other. However, since leg 20 is relatively fixed in the recess of the boring ~ar 10, the leg 22 will move radially away-from the leg 20 of cartridge 14. The leg 22 comprises a recess 50 with a clamp member S2 secured to the cartridge 14 by a screw 53~ The.clamp member 52 is adapted to hold a cutting tool 54 to the leg ~2 of cartridge 14.
Movement of differentla~ screw 44 in a clockwise direction, with right hand tapped threads 40A and 40B
in inserts 36A and 36~ corresponding to r.ight hand tapped threads 46A and 46B on shaft 44, causes the: leg 22 to move radially effecting the gap or recess 24 of cartrid~e 14 to widen thus causin~ cutting tool 54 to move radially outwardly. Moving the tool radia7ly outwardly will cut a larger diameter of the workpiece.
To move the cutting tool 34 radiaIly inward,.the : differential.screw 44 is turned counterclockwise, causing the two semi-cir ular bronze or steel inserts 36A and 36B to move toward each other, effecting movement of leg ~2 toward.leg 2n.
The bronze or steel p~ir of bushings or inserts 36A and 36B are made from a single round bar stock and cut through the center to provide two symmetrical halves or inserts. One insert is ~ored and threaded with pit~h different from the threaded bore of the other insert. The differential screw 44 has threads on each end of the shaft ~orresponding to the threaded bores of the two inserts 36A and 36B.
The invention described hereinabove provides more micro adjustment per revolution. That is, one revolution of a screw provides .02S inches, whereas one revolutlon .
.
3 :~5~5~
of a differential screw, as d~scribed hereinabove, provides . 006 inches. Furthermore, the cartridge is cheaper to manu~acture and replacement is more economica:l.
Previous inventions provide for ad; U5 ting the cutting tool such as disclosed in -the following United States Paten-ts: Eversole 3,801,213, Guli~on 3,765,7~8, Keller 4,105,360 and Shutz 2,266,339; and Russian Patent Samoilov 460,119.
However, the prior art fails to provide for adjusting the cutting tool in small or micrometer increments.
According to the present invention there is provided a tool cartridge attachable to a boring bar, there being provided a ~ight portion, a pair of legs extending from the bight portion in spaced apart, side-by-side relation with each leg having a threaded bore means, one of the legs being adapted for abutment against the boring bar when the cartridge is attached thereto and the other of the legs carrying cutting means thereon for cutting engagement with a workpiece when the one leg is abutted against the boring bar and the other leg is movable relative to the one leg. Screw means is received in the t~readed bore means of the legs connecting the legs such that rotation of the screw means moves the other leg and cutting means carried thereon relative to the one leg to adjust cutting diameter. Means is provided for attaching the cartridge to the boring ~ar.
In a specific em~odiment of the invention, the threaded bore means of the legs extend transversl~ across the legs in axial alignment with one another, the threaded bore means of the one leg and the other having different pitch threads. A screw, which has corresponding different pitch threads, is ~k ~ L65~35~
inserted through both legs of the cartridge. As the screw is turned, ~he two halves or legs of the cartridge tend to move away or close~ The movement of the cutting tool mounted on one of the legs o the car~ridge is radially adjusted depending upon the diEference between the two threads per inch tapped in each leg of the cartridge and ~orresponding threads on the differen-tial screw.
BRIEF DESCRIPTIO~ OF THE DRAWINGS
Fig. 1 shows part o a boring bar with the cartridge in place, and the radially adjustable cuttiny tool secured thereto;
Fig. 2 shows a cross-section of the boring bar and the cartridge, taken along line 2-2 of FigO 1;
Fig. 3 is a view taken along line 3-3 of Fig. 1;
Fig. 4 is a plan view of the bronze or steel insert;
Fig. 5 is the end view of the ~ronze or steel insert insert~
: Fig. 6 is a plan view of the differential screw showing different threads per inch thereon.
3~ DESCRIPTION OF T~E INVENTION
With reference to ~ig. 1 and Fig. 2, the portion of the boring bar 10 shows a recess 12 and a threaded bore 13 which provides the cartridge 14 to be fastened or secured thereto by a bol~ 16~ The ~artridge 14 has a bight portion 18 and two legs 20 and 22 separated by a recess 24. The reoess 24 terminates in a bore 26 ~ ~ ~ 5 t~
to provide resilient movement of the legs 20 and 22 of cartridge 14. Interconnecting the two legs ~0 and 22 is a recess 30. A bore 32 is reamed perpendicular to recess 30 to accomodate bronze or stee:L inserts 36A and 36B (shown in Fig. 4 and Fig~ 5)0 In operation the sub-assembly bronze or steel insert comprise semi-circular halves 36A and 36B which are dropped in the reamed bore 3~ of the cartridge 14. The bore 40A in bronze or steel insert 36A is threaded to a pitch that is different than the pitch in threaded bore 40B. For example, the preferred embodiment shows that the threaded bore 40A is ~6-40, the pitch being 1/40; and the threaded bore 40B is ~10-32, the pitch being 1/32.
The pitch difference between 1/40 and 1/32 is approx-imately .006 thousands of an.inch ~.031-.025j. The pitch is defined as the distance, measured parallel to its axis, between corresponding points on adjacent threads in the same axial plane.
A differential screw, shown in Fig. 6, incorporates two different tapped threads 46A and 46B in the same direction. That is, both tapped threads are either right hand or left hand threads. In the preferred embodiment, one thread is tapped #6-40 and the other thread is tapped #10-32~ The dif~erence between the--two differen~ pitches provides the motion or radi.al movement; for example, 40 threads per inch provides motion of 1/40 or .025 thousands of an inch, and 32 threads per inch provides a motion of 1/32 or .031 thousands of an inch. The two pitch dimensions are subtracted providing a difference of .006 thousands, the difference throu~h which the two semi-halves bron~e or steel inserts 36A and 36B start separating or coming together as the differential screw is being rotated or turned.
Thus, according to the preferred embodiment, the differential screw is inserted through the bores of 5 ~ ~
inserts 36A and 36B with the threads both right hand as defined above, and as the differential screw 44 is turned cloc~wise the bronze or steel inserts 36A and 36B are moved away rom each other. However, since leg 20 is relatively fixed in the recess of the boring ~ar 10, the leg 22 will move radially away-from the leg 20 of cartridge 14. The leg 22 comprises a recess 50 with a clamp member S2 secured to the cartridge 14 by a screw 53~ The.clamp member 52 is adapted to hold a cutting tool 54 to the leg ~2 of cartridge 14.
Movement of differentla~ screw 44 in a clockwise direction, with right hand tapped threads 40A and 40B
in inserts 36A and 36~ corresponding to r.ight hand tapped threads 46A and 46B on shaft 44, causes the: leg 22 to move radially effecting the gap or recess 24 of cartrid~e 14 to widen thus causin~ cutting tool 54 to move radially outwardly. Moving the tool radia7ly outwardly will cut a larger diameter of the workpiece.
To move the cutting tool 34 radiaIly inward,.the : differential.screw 44 is turned counterclockwise, causing the two semi-cir ular bronze or steel inserts 36A and 36B to move toward each other, effecting movement of leg ~2 toward.leg 2n.
The bronze or steel p~ir of bushings or inserts 36A and 36B are made from a single round bar stock and cut through the center to provide two symmetrical halves or inserts. One insert is ~ored and threaded with pit~h different from the threaded bore of the other insert. The differential screw 44 has threads on each end of the shaft ~orresponding to the threaded bores of the two inserts 36A and 36B.
The invention described hereinabove provides more micro adjustment per revolution. That is, one revolution of a screw provides .02S inches, whereas one revolutlon .
.
3 :~5~5~
of a differential screw, as d~scribed hereinabove, provides . 006 inches. Furthermore, the cartridge is cheaper to manu~acture and replacement is more economica:l.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tool cartridge attachable to a boring bar, comprising a bight portion, a pair of legs extending from said bight portion in spaced apart, side-by-side relation with each leg having threaded bore means, one of said legs being adapted for abutment against the boring bar when the cartridge is attached thereto and the other of said legs carrying cutting means thereon for cutting engagement with a workpiece when said one leg is abutted against the boring bore and said other leg being movable relative to said one leg, screw means received in the threaded bore means of said legs connecting said legs such that rotation of said screw means moves said other leg and cutting means carried thereon relative to said one leg to adjust cutting diameter, and means for attaching the cartridge to the boring bar.
2. The tool cartridge of claim 1 wherein the threaded bore means of said legs extend transversely across the legs in axial alignment with one another.
3. The tool cartridge of claim 2 wherein the threaded bore means of said one leg and said other leg have different pitch threads and said screw means has corresponding different pitch threads.
4. The tool cartridge of claim 1 wherein each.
threaded bore means comprises a transverse bore through each leg, an insert-receiving bore in each leg perpendicular to and in communication with said transverse bore, and an insert received in each insert-receiving bore, each insert having a threaded insert bore coaxially aligned with said transverse bore, said threaded insert bores having different pitch threads.
threaded bore means comprises a transverse bore through each leg, an insert-receiving bore in each leg perpendicular to and in communication with said transverse bore, and an insert received in each insert-receiving bore, each insert having a threaded insert bore coaxially aligned with said transverse bore, said threaded insert bores having different pitch threads.
5. The tool cartridge of claim 1 wherein said cartridge attachment means is associated with said bight portion.
6. A boring tool with an adjustable cutting diameter, comprising a boring bar having a long axis and an outwardly facing, open recess extending along the long axis and a tool cartridge mounted in said recess, said cartridge having a bight portion with means for mounting the cartridge in said recess, a pair of legs extending from said bight portion in spaced apart, side-by-side relation along the long axis in said recess with an inner leg abutted against the boring bar and an outer leg carrying cutting means for cutting engagement with a workpiece and being resiliently movable relative to said inner leg, said legs each having transverse threaded bore means in axial alignment with the threaded bore means of one leg having different pitch threads from the threaded bore means of the other leg, said cartridge further comprising transverse screw means threadably received in the threaded bore means connecting said legs with the screw means having different pitch threads adjacent opposite ends corresponding with those of the respective threaded bore means such that rotation of said screw means moves said outer leg and cutting means thereon relative to said inner leg to adjust cutting diameter without said screw means having to engage the boring bar for such adjustment.
7. The boring tool of claim 6 wherein each threaded bore means comprises a transverse bore through each leg, an insert-receiving bore in each leg perpendicular to and in communication with said transverse bore, and an insert received in each insert-receiving bore with each insert having a threaded insert bore coaxially aligned with said transverse bore, said threaded insert bores having different pitch threads.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17273180A | 1980-07-28 | 1980-07-28 | |
| US172,731 | 1980-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1165552A true CA1165552A (en) | 1984-04-17 |
Family
ID=22628972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000380299A Expired CA1165552A (en) | 1980-07-28 | 1981-06-22 | Micro-adjusting cartridge for cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1165552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103030A (en) * | 2021-04-08 | 2021-07-13 | 台州市福瑞美机械有限公司 | Multi-chuck clamp |
-
1981
- 1981-06-22 CA CA000380299A patent/CA1165552A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113103030A (en) * | 2021-04-08 | 2021-07-13 | 台州市福瑞美机械有限公司 | Multi-chuck clamp |
| CN113103030B (en) * | 2021-04-08 | 2022-07-12 | 台州市福瑞美机械有限公司 | Multi-chuck clamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |