Electronic Bevel Jig
Programmable bevel jig which is simple to use and can easily be attached to a workpiece to produce various types of complex bevels. Multiple angles and angle tolerances can be programmed into the jig, and then selected during machining. Different color LEDs indicate position of the jig with respect to a selected bevel angle, and also what pre-programmed bevel angle is selected. The reference angle of the jig is programmed into the jig by placing the jig on the grinding tool and pressing a pushbutton switch.
This invention relates to an electronic bevel jig which can be used with a tool such as a grinder or cutter to machine a workpiece to create various types of bevels.
Knives, swords, axes, and scissors are examples of objects in which bevels are ground. To produce a cutting edge on a knife, metal must be removed using a belt grinder at an angle. This angle is called the bevel angle.
There are several types of mechanical bevel jigs used by knife makers and machinists. Almost all these jigs are homemade. Some set the bevel angle by adjusting a bolt which protrudes from the bottom of an L-shaped bracket. The knife is mounted on the vertical part of the bracket using a clamp. This type of mechanical jig requires some type of inclinometer or some other means to set the bevel angle by adjusting the height of the bolt that is sticking out of the bottom of the L bracket. To grind both sides of the knife blade, the knife must be removed from the clamp several times during the machining process. These types of mechanical jigs are very bulky and require large work plates on the grinder. Also, adjustment of the bolt becomes tedious when creating compound bevels. There is another type of mechanical bevel jig (U.S. Pat. No. 798,760,882) which sets a bubble at the desired angle using an inclined piece of wood. The inclined wood is first placed on the platen of the grinding tool and the bubble is placed on the wood. The bubble is then centered by rotating the jig. The jig is then attached to the knife through a clamp. When trying to create multiple bevel angles, setting the angles using inclined pieces of woods and re-adjusting the jig becomes time consuming and tedious and in some cases impractical. This is especially true if one is trying to create a compound bevel or a near convex bevel where numerous bevel angles are required. The other problem with using the bubble to grind bevels, is the effort required to center the bubble during the grinding. The amount of effort needed, can cause eye strain, and can be very tiring. Yet one other problem with using the bubble to create bevels, is inaccuracy of the bevel. The machinist would not know how close his created bevel angle is to the actual desired angle. All these jigs, are either impractical or extremely difficult to use when multiple bevel angles are required.
SUMMARYThe present invention overcomes the above problems by providing a programmable jig that is simple to use and can easily be attached to a workpiece to produce various types of complex bevels. There are different types of bevels which are applied to knife blades, swords, axes, and other objects.
Digital filtering is used to filter out unwanted noise on the accelerometer signal. The noise sources are 60 HZ from machine and lighting fixtures, RF noise from various sources, operator's unsteady hand, and the vibration from grinding machine.
Custom PC application software is used to program the modes, angles, and tolerances.
The device is mounted on an L shaped bracket. A magnet is attached to the L bracket via two screws. The assembly then attaches to the blade by the magnet. The blade must be magnetically attractive to the magnet for the assembly to attach to the blade properly and securely. If the blade is not magnetically attractive, a magnetically attractive bracket must be attached to the blade first and then the device would attach to the bracket.
In another embodiment, a wireless module on-board enables the jig to communicate with cell phones or tablets or PCs to read the angle of device, read the programmed angles of the device, and to program new values into the jig.
In yet another embodiment, the bevel angles and tolerances are programmed into the device via speech recognition and programmed values are voiced to the user using speech synthesis.
In yet another embodiment, instead of LEDs showing the device position in relation to the programmed angle, audio is used to indicate position. Audio can either be synthesized speech or tones to indicate to the operator the position of the device.
In yet another embodiment, the angles and tolerances are programmed into the device via switches.
Claims
1. An electronic bevel jig for positioning the angle of a workpiece with respect to a tool so that said workpiece can be machined by said tool at a predetermined angle, comprising:
- a. a microcontroller,
- b. means of measuring angle of said jig with respect to the horizontal plane or vertical plane,
- c. programmable memory: to store multiple individual angles and multiple angle tolerances, and to store starting, ending, and step size of range of angles,
- d. means of programming said angles and angle tolerances into said memory,
- e. means of selecting multiple angles and angle tolerances,
- f. means of setting the reference angle of said jig,
- g. means of selecting positive or negative angles with respect to said reference angle,
- h. means of providing feedback to a machinist indicating position of said jig with reference to a selected angle,
- i. means of providing warning to said machinist if the position of said jig is outside the limits set by a selected angle and angle tolerance, and
- j. means of attaching said jig to said workpiece,
- whereby said jig can be used to machine said workpiece using said tool, producing various types of bevels including flat bevel, chisel bevel, sabre bevel, compound bevel, and near convex bevel.
2. The electronic jig as defined in claim 1, wherein a single switch:
- turns said jig on or off,
- selects a bevel angle and angle tolerance,
- selects the next bevel angle in a range of bevel angles,
- sets the reference angle of said jig, and
- selects positive or negative bevel angles with respect to said reference angle.
3. The electronic jig as defined in claim 1, wherein an accelerometer is used to measure angle of said jig with reference to the horizontal or vertical plane.
4. The electronic jig as defined in claim 1, wherein an inclinometer is used to measure angle of said jig with reference to the horizontal or vertical plane.
5. The electronic jig as defined in claim 1, wherein said angles and said angle tolerances are programmed into said memory by means of switches.
6. The electronic jig as defined in claim 1, wherein said angles and said tolerances are selected from said memory by means of a switch or set of switches.
7. The electronic jig as defined in claim 1, wherein said angles and said angle tolerances are programmed into said memory by means of a wired port.
8. The electronic jig as defined in claim 1, wherein said angles and said angle tolerances are wirelessly transmitted to said jig and programmed into said memory.
9. The electronic jig as defined in claim 1, wherein speech recognition is used to understand voice commands from a person to set said angle and said tolerance of said jig.
10. The electronic jig as defined in claim 1, wherein light emitting components are used to provide feedback to a user to indicate position of said jig with respect to a selected angle.
11. The electronic jig as defined in claim 1, wherein audio is used to provide feedback to a user to indicate position of said jig with respect to a selected angle.
12. The electronic jig as defined in claim 1, comprising a temperature sensor to verify that the ambient temperature is within operating specifications of said jig.
13. The electronic jig as defined in claim 1, wherein a rechargeable battery provides power to said jig.
14. The electronic jig as defined in claim 1, comprising battery management circuitry to control charging of said rechargeable battery.
15. The electronic jig as defined in claim 1, wherein a non-rechargeable battery provides power to said jig.
16. The electronic jig as defined in claim 1, wherein an AC to DC adapter provides power to said jig.
17. The electronic jig as defined in claim 1, wherein a magnet is used to attach said jig to said workpiece.
18. The electronic jig as defined in claim 1, wherein a clamp is used to attach said jig to said workpiece.
Type: Application
Filed: Jul 20, 2016
Publication Date: Jun 22, 2017
Inventor: BYron Joseph Hourmand (Escondido, CA)
Application Number: 15/214,476