CA2327555A1 - Twin tool holder - Google Patents
Twin tool holder Download PDFInfo
- Publication number
- CA2327555A1 CA2327555A1 CA 2327555 CA2327555A CA2327555A1 CA 2327555 A1 CA2327555 A1 CA 2327555A1 CA 2327555 CA2327555 CA 2327555 CA 2327555 A CA2327555 A CA 2327555A CA 2327555 A1 CA2327555 A1 CA 2327555A1
- Authority
- CA
- Canada
- Prior art keywords
- tool
- tools
- tool holder
- spindle
- axis
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
- B23B2270/14—Constructions comprising exactly two similar components
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
A tool holder for lathes configured in the lathe turret like an outside diameter turning tool. The holder has an opening with two opposing V-grooves to accommodate cylindrical tools. An adjustable locking wedge is used to spread movable jaws, which lock two tools simultaneously into the V-grooves. Tools of various outside diameters can be thus securely and rigidly clamped without the use of bushings.
Description
TWIN TOOL HOLDER
FIELD OF THE INVENTION
The present invention relates to tool holders for lathes and in particular to tool holder configured in the lathe turret like an outside diameter turning tool.
BACKGROUND OF THE INVENTION
In most CNC lathes setting-up small tools could be cumbersome and inefficient. Small center drills, spotting centers, drills, taps and boring bars usually require small collets, precision chucks or special bushings. These represent substantial inventory costs. Another disadvantage is that chucks and collet holders occupy valuable Z-axis space. Furthermore individual tools are set at the tool holder center and at discrete angular locations of the turret which result in a relatively long travel between a tool change.
Another problem is that small tools in general require much higher accuracy in setting the tool center to the spindle centre than larger tools. Since lathe turrets are notoriously misaligned using center tool holders makes it practically impossible to adjust for the misalignment. One solution to the above problems is described by EDI
Tooling Systems Inc. in the promotional literature for the Center Drill Holder. The Holder is configured and located in the tool turret like an outside diameter turning tool, which makes it possible to correct for turret misalignment. However, the EDI Center Drill Holder has limited application since it requires special bushing for each tool diameter.
SUMMARY OF THE INVENTION
The present invention overcomes the foregoing and other drawbacks by using two stationary opposing V-grooves to accommodate cylindrical tools. An adjustable locking wedge is used to spread movable jaws which lock two tools simultaneously into the V-grooves. Tools of various outside diameters can be thus securely and rigidly clamped without the use of bushings. The range of tool diameters is defined by the depth of V-groove.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further, by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a side elevational view of the twin tool holder according to the invention;
Fig. 2 is a top elevational view of twin tool holder illustrated in Fig. 1;
Fig. 3 is a cross-sectional view along lines A-A of the twin tool holder illustrated in Fig. 2;
DESCRIPTION OF THE PREFERRED
EMBODIMENTS
According to Figures 1 to 3 twin tool holder is generally a rectangular bar 1 having an opening defined by two opposing walls 2 and bottom surface 3. Each wall has V-groove 4 having sufficient depth to accept cylindrical cutting tool 5 and 6. Figure 2 shows an example where tool 5 is a center drill and tool 6 is a spiral drill. The two V-grooves are opposing each other. The tool holder opening is fitted with clamping device assembled from wedge 7 and jaws 8. Wedge 7 is adjustable in the direction perpendicular to the principal direction of the bar 1 using screws 9. Tightening the screws 9 causes jaws 8 to spread apart along bottom surface 3 and locking simultaneously tools 5 and 6 into V-grooves 4. In the preferred embodyment as shown in Figure 3 jaws 8 are connected by tension spring 10 which is laterally displaced by pin 11. This arrangement provide jaws 8 to stay abuted to the wedge 7 during unlocking operation which is convenient when tools are replaced.
FIELD OF THE INVENTION
The present invention relates to tool holders for lathes and in particular to tool holder configured in the lathe turret like an outside diameter turning tool.
BACKGROUND OF THE INVENTION
In most CNC lathes setting-up small tools could be cumbersome and inefficient. Small center drills, spotting centers, drills, taps and boring bars usually require small collets, precision chucks or special bushings. These represent substantial inventory costs. Another disadvantage is that chucks and collet holders occupy valuable Z-axis space. Furthermore individual tools are set at the tool holder center and at discrete angular locations of the turret which result in a relatively long travel between a tool change.
Another problem is that small tools in general require much higher accuracy in setting the tool center to the spindle centre than larger tools. Since lathe turrets are notoriously misaligned using center tool holders makes it practically impossible to adjust for the misalignment. One solution to the above problems is described by EDI
Tooling Systems Inc. in the promotional literature for the Center Drill Holder. The Holder is configured and located in the tool turret like an outside diameter turning tool, which makes it possible to correct for turret misalignment. However, the EDI Center Drill Holder has limited application since it requires special bushing for each tool diameter.
SUMMARY OF THE INVENTION
The present invention overcomes the foregoing and other drawbacks by using two stationary opposing V-grooves to accommodate cylindrical tools. An adjustable locking wedge is used to spread movable jaws which lock two tools simultaneously into the V-grooves. Tools of various outside diameters can be thus securely and rigidly clamped without the use of bushings. The range of tool diameters is defined by the depth of V-groove.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further, by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is a side elevational view of the twin tool holder according to the invention;
Fig. 2 is a top elevational view of twin tool holder illustrated in Fig. 1;
Fig. 3 is a cross-sectional view along lines A-A of the twin tool holder illustrated in Fig. 2;
DESCRIPTION OF THE PREFERRED
EMBODIMENTS
According to Figures 1 to 3 twin tool holder is generally a rectangular bar 1 having an opening defined by two opposing walls 2 and bottom surface 3. Each wall has V-groove 4 having sufficient depth to accept cylindrical cutting tool 5 and 6. Figure 2 shows an example where tool 5 is a center drill and tool 6 is a spiral drill. The two V-grooves are opposing each other. The tool holder opening is fitted with clamping device assembled from wedge 7 and jaws 8. Wedge 7 is adjustable in the direction perpendicular to the principal direction of the bar 1 using screws 9. Tightening the screws 9 causes jaws 8 to spread apart along bottom surface 3 and locking simultaneously tools 5 and 6 into V-grooves 4. In the preferred embodyment as shown in Figure 3 jaws 8 are connected by tension spring 10 which is laterally displaced by pin 11. This arrangement provide jaws 8 to stay abuted to the wedge 7 during unlocking operation which is convenient when tools are replaced.
Claims (2)
1. A tool holder for clamping cylindrical tools, said tools used for machining in a lathe, said lathe having a spindle and a turret, each said cylindrical tool having central axis, said spindle having rotational axis, said axis of each cylindrical tool being parallel to the axis of said spindle, said tool holder comprising:
a body mountable to said turret, said body having an opening defined by two opposing parallel walls and one bottom plane connecting between said walls, each said wall having V-groove oriented parallel to the axis of said spindle, said V-grooves simmetricaly opposing each other, said V-grooves having sufficient depth to fit said cylindrical tools, said V-grooves and the axis of said spindle all being in the same plane when said cylindrical tools are positioned to perform machining;
a clamping assembly fitting into said opening of the tool holder, said assembly having a wedge and two jaws, first jaw located on one side of said wedge and second jaw located on the opposing side of said wedge, said wedge adjustable and lockable in the direction perpendicular to said bottom plane of the opening causing said jaws to move in the direction parallel to said bottom plane of the opening, each said jaw locking said cylindrical tool into said V-groove.
a body mountable to said turret, said body having an opening defined by two opposing parallel walls and one bottom plane connecting between said walls, each said wall having V-groove oriented parallel to the axis of said spindle, said V-grooves simmetricaly opposing each other, said V-grooves having sufficient depth to fit said cylindrical tools, said V-grooves and the axis of said spindle all being in the same plane when said cylindrical tools are positioned to perform machining;
a clamping assembly fitting into said opening of the tool holder, said assembly having a wedge and two jaws, first jaw located on one side of said wedge and second jaw located on the opposing side of said wedge, said wedge adjustable and lockable in the direction perpendicular to said bottom plane of the opening causing said jaws to move in the direction parallel to said bottom plane of the opening, each said jaw locking said cylindrical tool into said V-groove.
2. A tool holder as claimed in claim 1 wherein said jaws are connected with a tension spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2327555 CA2327555A1 (en) | 2000-12-06 | 2000-12-06 | Twin tool holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2327555 CA2327555A1 (en) | 2000-12-06 | 2000-12-06 | Twin tool holder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2327555A1 true CA2327555A1 (en) | 2002-06-06 |
Family
ID=4167819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2327555 Abandoned CA2327555A1 (en) | 2000-12-06 | 2000-12-06 | Twin tool holder |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2327555A1 (en) |
-
2000
- 2000-12-06 CA CA 2327555 patent/CA2327555A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |