horizontal spindle rotary table grinder in stock

PERFECT PFG-R Rotary Surface grinders are equipped with a Horizontal Spindle to ensure the most precise and accurate grinding operations are undertaken. With rotary tables allowing a ground capacity from 200mm to 400mm across four models. The PFG-R Series utilise the established saddle type construction used within the current product range.

ARTER Model A1-12 Rotary Surface Grinder w/ horizontal spindle and Tilting Table for the sharpening shaper cutters and grinding of other round surfaces

ARTER Model A1-12 Rotary Surface Grinder w/ horizontal spindle and Tilting Table for the sharpening shaper cutters and grinding of other round surfaces

PRECISION SURFACING SOLUTIONS supports manufacturers in a wide variety of industries in which precision grinding, lapping, polishing, deburring and advanced materials processing equipment is commonly used. They all need high-quality, high-precision, stable and well-engineered machines to manufacture high-quality work pieces.Visit Site

Founded in 1934, KEHREN is a well-established designer and builder of high-precision grinding machine tools and systems under the following categories: vertical grinding centers, vertical grinding centers with portal design, surface grinders with rotary tables and horizontal spindles, and surface grinders with dual rotary tables and vertical spindles.Visit Site

We always insisted on the management concept of"Customer first,quality first,service first".Ample supply of the company can ensure the long term and excessive supply,and stable quality,reasonable price.We sincerely welcome you to visit our company and contact us for cooperation.

ARTER B-24 HORIZONTAL SPINDLE ROTARY SURFACE GRINDER Serial Number: 3420 Stock Number: 2116 SURFACE DIAMETER OF MAGNETIC CHUCK …………….. 25″ MAX. SWING INSIDE GUARDS ……………………… 36″ VERTICAL CAPACITY UNDER FULL 20″ WHEEL …………. 8″ TILT OF TABLE FOR CONVEX OR CONCAVE GRINDING ……. 10 DEG. GRINDING WHEEL SIZE ………………………….. 20″D X 12″BORE X 2″WIDTH CHUCK ROTATION SPEED …………………………. UP TO 75 RPM GRINDING WHEEL SPINDLE SPEED ………………….. 950 RPM HANDWHEEL FOR RAISING & LOWERING WORK TABLE IS CALIBRATED IN INCREMENTS OF ………………. 0.005″ FINE FEED KNOB FOR RAISING & LOWERING WORK TABLE IS CALIBRATED IN INCREMENTS OF ………………. 0.0001″ APPROXIMATE MACHINE WEIGHT ……………………. 10,700 LBS Machine Has been Dis-Assembled, New Rulon on the Table.  Spindle Run Quiet * Issues with the Feed Mechanism and Some Play in the Ram

The CRG-H4 is designed for precision grinding of parts up to 400mm in diameter. It is able to quickly effectively remove stock from a variety of materials including steel, ceramic, silicone and cast iron. Capable of holding flatness and parallelism to +/- 0.005mm. Work-pieces can be clamped centered or multiple parts can be ground positioned off center. Due to the rotating table, the grinding wheel is almost continuously in contact with the workpiece, resulting in higher productivity compared with standard surface grinding due to the elimination of the continuous table reversals.

Today’s rotary surface grinders offer sophisticated sensors and controls that can reliably achieve tighter dimensional tolerances, flatness, parallelism, and surface finish. The equipment can be used to grind flat metals, alloys, and ceramics to precise dimensions before polishing.

Operator control over the process is unsurpassed with the new automated grinders. The user can enter the specific requirements, for example: 712 RPMs on the spindle, 22 RPMs on the table, with a down-feed rate of .003 inches per minute, with a certain dwell cycle. Essentially, the machine can be programmed to meet just about any requirement.

Compared to traditional grinding equipment with manual controls that require experienced machinists familiar with the nuances of each machine, these automated units consistently produce higher quality parts in less time. As a result, a growing number of machine shops are installing new grinders that can be operated by less experienced personnel while still achieving the desired results.

To do this, machine shops primarily utilize surface grinders with a reciprocating table and a horizontal spindle that turns the grinding wheel, but the process is slow.

“Reciprocating table grinders are precise, but the material removal rate is slow and multiple passes are required,” says Erik Lawson, engineering manager at Winona, MN-based DCM Tech, a designer and builder of industrial rotary surface grinders.

Older rotary surface grinders are another option but can be problematic in the hands of less experienced operators. With limited control of spindle speeds as well as manual controls, the older equipment requires sophisticated operators that can factor in complex calculations. Considerable expertise and experience are required, which can be a challenge as skilled operators retire.

In modern vertical spindle, rotary table surface grinders, the table rotates with the workpiece held firmly in place underneath a vertical spindle. The grinding is not performed by the peripheral edge of the wheel, but by the entire diameter of the abrasive surface, which facilitates grinding performance and consistency.

“With rotary table surface grinders, the entire part passes through the wheel, which is more efficient than reciprocating table grinders that may have workpieces wider than the grinding wheel,” said Lawson.

Today, surface grinders are designed with sensors and controls that automatically maintain tight tolerances, removing material down to within one ten-thousandth of an inch of the final thickness. Digital technology allows for an interface with easy-to-use touchscreen controls. When combined with automation, surface grinder operators are no longer required to be trained individuals.

For example, rotary units such as DCM Tech’s IG 280 SD, with a 24” variable speed table and 20HP variable speed grinding spindle motor, make it possible for virtually anyone to successfully operate a unit. This model automates the initial contact between the abrasive wheel and part, which typically had to be finessed by the operator. With this updated option, advanced sensor technology detects vibration and can automatically fine-tune not only the pressure of the spindle motor but how quickly it moves the wheel down onto the part. When the machine senses the abrasive wheel has contacted the part, it begins the grind cycle automatically.

With regard to production efficiency, the advanced rotary surface grinders are also much faster than reciprocating grinders because the units can get much closer to the required precise dimensions before any finishing steps. This capability can reduce or even eliminate some lapping and polishing steps.

With a conventional surface grinder, if a stock with standard thickness needs to be ground down, an operator would stop short of the required removal and leave an unpolished surface. Using another machine was often required to remove the remaining material but this can take excessive time and labor.

“A rotary surface grinder will usually finish the work of a reciprocating grinder in a fraction of the time. For the manufacture of carbide blocks, one OEM was able to document a 14X improvement in cycle time by replacing a reciprocating grinder with a DCM rotary surface grinder,” said Lawson.

The grinder can also be programmed to take corrective actions on subsequent passes if the workpiece is a little off on the first pass. There is no need to pick up the workpiece and measure it after every move as with older machines.

According to Lawson, the automation provided by advanced rotary grinders allows operators to set up the machine and then attend to other tasks. The machine does not need to be constantly monitored because it has built-in load monitoring.

“Load monitoring allows the user to set limits so the machine does not overtax the part being ground or overload the spindle. If something a little unusual happens it can continue without interruption or shutting down,” said Lawson.

As metal and alloy grinding tolerances become stricter and production requirements more demanding, machine shops that take advantage of advanced, automated rotary surface grinders will outperform rivals even as experienced operators retire.

“With automated rotary surface grinders, a machinist can be trained to be proficient at operating the equipment by lunch on the first day. It just takes a few hours of training, not decades of experience as with older machines,” said Lawson. He added that systems incorporating full automation are now being developed that will use a robot to load, set up, and run parts without an operator nearby.

Surface grinding is the most common type of grinding process. It is a fixture in heavy industry where various kinds of metal and non-metal objects need to be refined and smoothed for a finishing process. This is most often seen in the automotive industry. A surface grinder consists of a table, above which is held the abrasive wheel. A device called a chuck holds in place the item being worked on, referred to as a workpiece. Chucks can be magnetic, vacuum, or mechanical, depending on the workpiece composition.

There are three basic types of surface grinders: horizontal-spindle, vertical-spindle, single disc grinders and double-disc grinders. Each machine is best suited to certain items. The essential difference is in how the grinding wheel makes contact with the workpiece.

Horizontal-spindle grinders, also called peripheral grinders, work best for high-precision work, such as angled or tapered surfaces and slots or recessed surfaces. The flat edge of the wheel -the periphery- makes contact with the piece. Pins, pistons, connecting rods, and bearing races are examples of components ground using this type of machine.

Vertical-spindle grinders, or wheel-face grinders, are typically used for fast material removal. The face of the grinding wheel is lowered onto the workpiece below it. Vertical-spindle grinders work best for stators, wafers, rotors, gears, inner rings and inner plates, and stops and spacers.

Single-disc grinders and double-disc grinders appear as both horizontal-spindle and vertical-spindle styles. Disc grinders have a larger contact area between the grinding surface and the workpiece, and can grind both sides at once. Some rotors, plates, spacers, gears, and washers can be put into disc grinders.

JTEKT Machinery offers three models: R Series vertical spindle/rotary table grinders, HD Series horizontal spindle type double disc grinders, and KVD Series vertical spindle type double disc grinders. Each series can be adapted with several feed styles to accommodate all types of production. JTEKT Machinery is a world leader in the development and manufacture of custom centerless, surface, and specialty grinders. Contact us today to find out what we can do for you!

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