Machine-Controller: ADTECH provides PC Based CNC Machine Tool Controll...

Machine-Controller: ADTECH provides PC Based CNC Machine Tool Controll...: As the leading manufacturer of  motion control solution in China, ADTECH provides PC Based  CNC Machine Tool Controller  software an...

ADTECH provides PC Based CNC Machine Tool Controller

As the leading manufacturer of  motion control solution in China, ADTECH provides PC Based CNC Machine Tool Controller software and hardware toolkits for the CNC and general factory automation industries. PC Based CNC Controls, CNC Controls for the CNC retrofit and CNC Controller OEM market.  ADTECH's PC Based Controllers are based on open CNC Controls. CNC Retrofits for any CNC Machine type such as CNC Mill, CNC Router, CNC Lathe, CNC Laser, CNC Plasma, CNC Grinder, CNC EDM and CNC Punch Presses.

With ADTECH you may choose to use your existing CNC enclosure and motors or choose from a wide selection of"ready-to-go" CNC enclosures. ADTECH offers everything necessary when using your own Windows-based PC. Desktop control enclosures, handheld pendants and floor models are available for most machine tools. All software and hardware are also sold ala carte.

ADTECH's PC based CNC machine tool controller not only have been use in CNC industries, but can be used in electronic processing, biological and medical equipment, printing and packaging and measurement industries.

Effective Cooling for Grinding

Cool-Grind Technologies, says nozzles that deliver a focused stream of coolant offer a number of advantages versus conventional plastic and rigid tube nozzles.  

Nozzles are often used to supply coolant during grinding or machining operations to control workpiece temperature, keep the grinding wheel or tool clean and open for chip flow, enable extreme pressure additives in the coolant to do their job, and flush chips away from the cutting area. Popular configurations include rigid, bent metal tubes and conformable plastic versions with many joints. Plastic nozzles are designed for low pressure (approximately 30 psi) and can stray out of position at higher pressure. They are easy to aim, but need to be placed close to the workpiece because they generate wide, dispersed jets that entrain air into the coolant stream. Rigid metal tubes are stiffer, but they also deliver dispersed coolant jets. Re-aiming them requires frequent bending that ultimately leads to fracture. Plus, their close proximity to the tool can result in damaged nozzle tips and reduced jet quality.

 

During the past 20 years, I have demonstrated that coherent-jet nozzles are more effective than plastic and rigid tube nozzles for coolant delivery. Their internal nozzle geometry creates a tight, coherent jet when the coolant exits. This is especially important for grinding, because most of the heat goes into the part, not away with the chips.

 

Grinding wheel speeds of 6,000 sfpm or higher generate a boundary layer of air that stops low-pressure coolant from wetting the wheel surface. Conversely, coherent jets’ higher impact energy and their ability to match the wheel speed remove that boundary layer and enable the wheel to carry the coolant directly into the grinding zone. The concentrated stream is also easier to aim into critical cutting areas even at pressures as high as 600 psi. (Miniature lasers are available that fit onto the tip of a nozzle to predict the aim of the jet.) In addition, the flow rate of coolant into the cutting zone is more defined than with a dispersed jet. For grinding, an established flow rate model to effectively cool the process is 2 gpm per spindle horsepower. Therefore, a 5-hp cycle requires a 10-gpm coolant flow rate. This stream has to be correctly aimed for effective grinding at this flow rate.

 

Coherent-jet nozzles also offer a high degree of adjustability and stiffness once aimed. Nozzles can be fitted with swivel joints that lock after aiming. Individual nozzles are fitted with threaded caps and linear manifolds (with an array of two or more nozzles) are fitted with knurled knobs. Round and flat nozzle tubes (nozzles attached to tubes) can be bent very close to the tip of the nozzle using special tube benders. In addition, nozzle tubes can be fixed to a manifold or pipe fitting using special collets to enable axial and rotary adjustment when aiming the jet. This differs from conventional compression fittings that bite permanently onto a tube. Such inherent versatility enables very complex wheels or tool profiles to be fully covered by coolant.

 

Benefits of improved coolant delivery using coherent jet technology include:

 

• Reduced tool wear. Consistent, direct cooling exploits the lubricity of the coolant, reduces grinding wheel dressing frequency and enables harder grade wheels to be used without the concern of workpiece thermal damage.

 

• Better workpiece surface integrity. There is no quenching of a hot workpiece before the next wheel pass when coolant delivery is consistent.

 

• Reduced pumping energy. Direct cooling reduces the total flow rate supplied to the machine, decreasing the amount of pumping energy that’s needed.

 

• Reduced foam and filter media indexing. A more effective overall grinding process is possible with greater nozzle efficiency and a lower flow rate.

 

• Unattended operation. More rigid nozzles prevent jets from moving out of position so that machines can continue to run safely while an operator is away.

 

• More consistent spindle power. Less loading of the wheel (or tool) with chips produced in previous revolutions yields more stable spindle power and better part geometry.

 

• Less risk of nozzle damage. Grinding processes are inherently more robust when nozzles can be located farther from a wheel or tool.

Article From: 11/13/2012 Modern Machine Shop, John Webster, President from Cool-Grind Technologies

ADTECH众为兴: What types of NC systems?

ADTECH众为兴: What types of NC systems?: Types of  NC Systems   When classified according to the  CNC  machine control system ,   there are three basic types of NC systems:  1. ...

What types of NC systems?

Types of NC Systems 

When classified according to the CNC machine control system, there are three basic types of NC systems: 
1. Point to Point. 
2. Straight Cut. 
3. Contouring.

The classification is concerned with the amount of control over the relative motion between the workpiece and cutting tool. The least CNC control is exerted over the tool motion with the point to point systems. Contouring represents the highest level of control.

Point-to-Point NC: 
Point to point is also sometimes called a positioning system. In PTP the objective of the machine tool control system is to move the cutting tool to predefined location. The speeders path by which this movement is accomplished is not important in point to point NC. Once the tool reaches the desired location, the machining operation is performed at that position. NC drill presses are a good example of PTP systems. The spindle must first be positioned at a particular location on the workpiece. This is done under PTP control. Then the drilling of the holes is performed at that location. The tool is moved to the next hole location, and so forth. since no cutting is performed between holes there is no need for controlling the relative motion of the tool and workpiece between hole locations. On positioning systems the speeds and feeds used by the machine tool are often used by the machine operators rather than by the NC tape. Positioning systems are the simplest machine tool control systems and therefore the least expensive of the three types. However for certain processes such as drilling operations and spot welding.PTP is perfectly suited to task and any higher level of control is unnecessary.

Straight Cut NC: 
Straight cut control systems are capable of moving the cutting tool parallel to one of the major axes at a controlled rate suitable for machining. It is therefore appropriate for performing milling operations to fabricate workpieces of rectangular configurations. With this type of NC systems it is appropriate for performing milling operations to fabricate workpieces of rectangular configurations. With this type of NC system it is not possible to combine movements in more than single axis direction. Therefore angular cuts on the workpiece would not be possible. An NC machine tool capable of performing straight cut movements is also capable of point to point movements.

Contouring NC 
Contouring is the most complex flexible and tech most expensive type of machine tool control. It is capable of performing both PTP and straight cut operations. In addition the distinguishing feature of the contouring NC system is their capacity for simultaneous control of more than one axis movement of machine tool Figures below illustrate the versatility of continuous path NC. 

Milling and Turning are the common examples of the use of contouring control.