Techniques for Handling Big Parts with a CNC Router Machine

It is easy to handle CNC router, but it gets hectic when you have to deal with parts bigger than your machine. However, with smart and right strategies, one can deal with it.

Problems to Overcome
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Usually, two kinds of problems are likely to occur while using these machines. The first challenge is to break the part into small setups in which every setup should give the access to the various portion of the part. Therefore, you have to line it up accurately. Afterward, you have to find out the way to get the part fit into CNC router enclosure.

Sorting Out Major Problems While Handling CNC Router
•  Check for Collisions: You must start the venture by carefully checking for collisions as it might lead to an unrepairable damage to the part.

•  Be Careful: Perhaps, you line up straight edges with straight edges. However, a diagonal is longer than any edge in a rectangle. So, you can try putting the part at an angle without lining up the straight edges. Also, you have to care that the part feature lined up along with the CNC router machine.

• Know about the Complete System: Heavier parts need proper support during the cutting process, which makes roller tables auto loading and off loading systems an important part of the CNC router machine. Such automatic systems comprise indexing table, material loading/unloading arm, and offloading conveyor table .

•  Understand the Use of Pop-Up Pin: It comprises an important part of the CNC Router model machines as it helps the processing sheet to find the home points quickly. Here is how it works:

1.    The pop up pin swings up from the table surface.  
2.    The operator moves, aligns and makes the processing sheet closer to pop up pin.
3.    This makes  the sheets ready for work from home point.

• Use Auto Pressure Plate: You might have faced problems in cutting or engraving materials with thickness even less than 10mm. It is hard to get the desired result with such thin material despite fixing its edge through clamp. The Auto Pressure Plate is a befitting solution to this problem as its helps the surrounding area of spindle to press the working table tightly and perform the cutting/engraving task effectively.

•  Act Wisely: When it comes to round parts, try spinning instead of sliding them. However, if the part is too big for lathe machine, then it is wise to prefer a flywheel.

These techniques can be useful when processing big parts. All it takes is a little ingenuity to make use of your CNC machine’s work envelope effectively.

Thoughtful CNC Wood Working

Pc Numerical Management or CNC machine is now an vital part of manufacturing process. Industries and woodworkers, whether it is in small or large scale, would have CNC woodworking equipment to assist them increase their production.

CNC machines are used to exchange handbook processes or work in coordination with current manufacturing processes. CNC machines are programmed to follow or to perform sure operations. An instance of a CNC machine used in woodworking is a CNC router.

Just like a typical CNC machine, the CNC wood router would use a pc software program and a CNC controller. This might create a extra accurate and exact design in comparison with these that are executed manually. A CNC router would have three directions that are known as X, Y and Z axis. Since all of the axis work collectively, they’ll create better designs and shapes.

How does the CNC wood router works? It is controlled, as mentioned by the CNC controller and the pc software. This might direct the movements of the motor to provide the design or shape. The software would have the drawing or the format in 2D or 3D picture, it might then be transformed right into a software path code like the G-code. The codes that are transformed by the computer software would then send or relay it to the CNC controller which would management the motors and drive systems.

The part of the CNC wood router which performs the actual cutting is called spindle. To classify the spindle, horse energy (in English units) and watts (SI units) are used. Spindles rotate for about 8000 to 30,000 rpm or revolutions per minute. It may reduce supplies starting from mushy to hard supplies like plastic and metals. It is controlled by the CNC controller.

The spindle is moved by the CNC linear drive system. It has the motor, bearing system and the linear screw assembly. There are two kinds of motors utilized in CNC wood router: the stepper and servo motors. Though they each offer good performance, their distinction lies on the closed loop system. The servo motor sends indicators back to the controller when the process is finished, which known as the closed loop system. This technique shouldn’t be current on the stepper.

Another part of the CNC wood router is the cutting bed. That is where the fabric that may undergo cutting is positioned and secured using bolts and clamps. There are different cutting bed designs, the most popular can be the T-slot and the vacuum table. The effectivity of the cutting bed could be based on what kinds of supplies and reduce are made. For instance, T-slot cutting bed may hold different sorts and sizes of supplies, but they are not ideal for velocity cutting.

There are extra options which could possibly be based mostly on the models of the wood router. Some would have vacuum pump that may secure the supplies routed, print-to-reduce cameras which would guarantee precision, and other excessive-end options which can increase productivity and quality.

The nice thing with CNC woodworking equipment like the wood router is that it doesn’t require a lot supervision as soon as the machine and the method are already programmed. CNC wood routers may guarantee uniformed and high quality merchandise, so long as the machine is correctly regulated, maintained and operated.

Nigel has been writing articles on-line for nearly 6 years now. Not solely does this author specialise in Cnc Woodworking,

CNC Manufacturer Uses FARO Laser Tracker to Perform Alignments and Volumetric Compensation

CNC (Computer Numerical Control) machines have successfully transformed the manufacturing industry from using hard-wired machines, whose operating parameters could not be changed, to machines that can cut curves as easily as straight lines and can produce complex 3-D structures with ease.

In the mid-1970s, Thermwood Corporation developed the first commercial CNC machine tool control and used it to build machinery to trim its plastic parts. Thermwood then began selling this trim equipment for plastics and woodworking applications and the CNC router was born. Thermwood is currently the oldest CNC router company and continues to offer products for the woodworking, plastics, and aerospace industries.

Problem

An important process for their CNC machines is axis alignment verification. Thermwood was using stationary-beam laser interferometers to check for straightness and level, as well as to acquire data for linear lead screw compensation. All orthogonal measurements had to be accomplished with mechanical instruments such as precision machine squares.

The mechanical instruments, however, were not the desired solution, as they required multiple setups, which in turn required a great deal of back-tracking to verify alignment states. There was no quick or easy way to monitor changes resulting from interactions within the process. This often required multiple interim checking operations, which became time consuming.

Thermwood was also looking for a solution to volumetric axis compensation. With their large 5-axis routers and mills that perform precision 3-dimensional work, minute variations in head positioning can become a major issue, as they are adding a conspicuous third dimension into the mix.

Solution

The FARO Laser Tracker became that solution for Thermwood. The Laser Tracker has not only provided them with a better way to perform axis alignment verification, but has also allowed them to successfully perform volumetric axis compensation.

Axis Alignment Verification

The implementation process of the Laser Tracker for alignment applications proceeded very quickly. “Enough cannot be said for the trainer,” said David Stutsman, Engineer at Thermwood. “Within a week, our cumbersome mechanical measuring instruments and levels were gathering dust.”

In this process, Thermwood uses the Laser Tracker to measure and map linearity in preset increments, as well as the orthogonal relationship between the various axes on the machine. Alignment technicians utilize this data to make critical adjustments to the machine components, after which the Laser Tracker verifies the proper state of alignment.

The initial Laser Tracker measurement setup is performed in the early stages of machine assembly, while the machine is only comprised of the various weldments with all of the rails mounted. During this initial operation, the Laser Tracker’s SMR (spherically mounted retroreflector) is fitted onto a special fixture, which allows it to be attached to each rail and moved manually along them. This fixture is then fitted with precision rail bearings, which allows it to track the rail very precisely. This initial setup makes it possible for Thermwood to take readings and make major adjustments in the assembly positions of the rails, based on information derived from the Laser Tracker.

Once the initial leveling and alignments are finished, machine assembly is completed, the servo drive system is fitted, and the computer control is installed. After the initial power-up, the machine is again checked using the Laser Tracker, then additional minor calibration adjustments are performed if necessary.

Volumetric Compensation

Volumetric compensation required a little more time to implement, as all of the software for this application was developed in-house. As a CNC machinery manufacturer, Thermwood has always developed its own software and built its own controls. “Having our software engineers on staff benefited us greatly in the development of this process,” said Stutsman. “We believe that our system is on the leading edge of this technology.”

In this process, Thermwood acquires positioning data in a matrix pattern on multiple planes. By adding multiple planes, they are able to represent the entire cubic space displaced by the machines’ axes. The entire work envelope of the machine is mapped to provide absolute positioning data at numerous predetermined points. A correction table is developed by triangulating between the various points in volumetric model space, measuring the error for each position, and formulating a table of correction data to be loaded into the machine control and accessed during program execution.

The method of compensating for error during the program cycle is essentially the same as with linear compensation, except that during program execution the control is required to simultaneously track and compare axis movement on three distinct orthogonal paths, and to affect positional corrections correspondingly on all three axes, in phase with program execution.

“Writing the software that allows the Laser Tracker to communicate with the machine control was a relatively simple task,” stated Stutsman. “On the other hand, developing algorithms to interpolate error at any given point within the operational envelope was a daunting task, requiring months to complete. However, this effort is paying off in terms of greatly increased positioning and tracking accuracy. We feel that this has given us a position of superiority over other CNC manufacturers.”

Return on Investment

The two FARO Laser Tracker units are in use nearly every day at Thermwood, performing either or both of the applications. Consistencies of their CNC machines and their overall quality have both been impacted positively since implementing the Laser Trackers.

The amount of time required for machine alignments has been cut to less than half. What once took up to eight hours to complete can now be accomplished in approximately three. The greatest savings are realized on the larger, more complex machines. In addition, Thermwood can now perform volumetric compensation, which would not have been possible without the Laser Tracker.

“The FARO Laser Tracker has had a significant positive impact on the overall quality and value of our product,” said Stutsman. “We expect gains in market share as a result.”