Centrifugal Disc Finisher The technical and chemical engineers from Roto-Finish have perfected the centrifugal disc technology and have produced a parts finishing system that is second to none in the world. A bold statement that we back up with one of the best warranties in the business. Simply stated, Roto-Max® is a high speed, high energy finishing system for deburring, surface improvements, descaling and finishing parts made of metal, rubber or plastic. It’s a finishing machine designed to machine tool specifications. Roto-Max® machines reduce vibratory process cycles for deburring hard metals, rough forgings and castings to the finishing of jewelry, hardware, and medical implants. Centrifugal disc technology involves a machine consisting of a motor-driven, saucer-shaped rotor mounted inside and near the base of a large processing chamber. Both the rotor and the stationary lower ring are coated with high-impact resistant molded polyurethane for extended life. Parts, media and compound are loaded into the processing chamber, and the high-speed disc rotation creates the centrifugal force that moves the media and parts up the stationary sidewall. When the mass reaches the apex, the force of gravity pulls the material back to the disc. The process repeats. The doughnut-shaped path of the mass produces a highly efficient process that is up to 15 times faster than our own superior vibratory finishing process. The small open space between the rotor and the lower ring is the seal gap. The patented Roto-Max® Up-Flow® uses pressurized solution and processing compound which is forced up through the seal to keep the seal gap area lubricated and free of small abrasive particles, which greatly increases the seal life. This is Up-Flow®. Solution in the lower chamber stabilizes the rotor, thus maintaining its symmetrical alignment during rotation - a process known as hydrostatic balancing. The constant cooling effect of the water on the urethane prevents expansion and premature seal failure. Water, compound and contaminates are continuously drained through the sidewall drain screens in the processing chamber. Upon the cycle completion, the Roto-Max® Up-Flow® allows the abrasive particles to drain down through the patented hollow-core drive shaft in the center of the processing chamber. This unique draining ability prevents material from entering the seal and thus increases the seal life. It completely drains the fluid from the mass. With other designs, processing fluid is left in the bottom of the process chamber. This results in greater potential for media residue and corrosion. Roto-Max® dry finishing units also utilize our patented Up-Flow®. Compressed air (used in place of solution) is forced up through the lower seal gap preventing media, parts or other abrasive material from accumulating in the seal area. The dry Roto-Max® Up-Flow® is used for a variety of processes, e.g. to deburr, descale, or to achieve high-luster finishes. Features: · Seal design accommodates a wide variety of parts and media sizes. · Choice of smooth or ribbed polyurethane lining. · Power separation of parts, media and fines. · PC control panel with process timer and hour meter. · 1800 rpm, 230/460 V, 3 phase, 60 Hz main drive motor. · Helical bevel gear box. · Electrically controlled compound solution system with water flow meter and flow control processing and shutdown functions. · Programmable control, will shutdown the machine automatically if the solution flow rate is insufficient. · Custom urethane linings for specific applications.
Summary of Benefits: · Centrifugal action is approximately 15 times faster than traditional vibratory finishing. · Cooler, more cushioned mass reduces part damage. · Unique seal design reduces intrusion of smaller parts and media, thus extends service life of rotor. · Wider range of surface finishes attainable with a given media. · Provides high energy deburring, descaling and improving surface finishes.
Models & Options Roto-Max® Up-Flow® units are available in 1, 2, 3 and 6 cubic-foot models.Available either as a fully automatic batch finishing system, a semi-automatic system (power separation), or manual (parts to be hand-picked). 
|  | RM-1N | RM-1P on optional steel skid | 
RM-3A |  | Dry finishing systems also are available in 1, 2, 3 and 6 cubic-foot models, manual (no separation) or power separation only. | RM-3A front view, doors open |
Accessories and Supplies: Roto-Finish offers a full line of supplies to meet all your finishing needs. Screens: A wide range of coated and uncoated screens is available in sizes and configurations for effectively separating, classifying and transporting the media and parts. Media: The broadest selection of media in ceramic, plastic, cob meal, wood and other materials is available from Roto-Finish. Media is available in a wide range of sizes and shapes to match virtually any finishing need. Compound: Finishing chemical compounds formulated specifically for the Roto-Max® Up-Flow® are in stock and available for immediate shipment. All compounds are biodegradable. Support Service: Specialists in finishing technology are available to evaluate your process and finishing requirements to provide you the most efficient formulation of media and compounds.Roto-Finish’s service engineers are available for installation advice, troubleshooting, and servicing of all Roto-Max® Up-Flow® equipment. These individuals report to the chief engineer in order to provide the most up-to-date technical advise and service. Sequence of Operations for the Automatic Model For the Roto-Max® automatic processing system, the sequence of operation is as follows. · Parts and preselected media are placed into the loading hopper. · On command, the hopper is elevated and transfers its contents into the processing chamber, and a rinse bar flushes the hopper with water. · The controlled start-up speed of the motor begins the rotation of the rotor. Water and chemical compound are metered into the processing chamber through the seal. There is continuous draining through the side drains. · Following the timed controlled cycle, the unit shuts down and the solution is drained through the patented hollow-core drive shaft, then the processing chamber pivots automatically to empty its contents of parts and media. This unloading process is precisely controlled and the inverted processing chamber is rinsed with water before returning to its operating position. · Contents are emptied onto a multi-level vibrating screening system. The top separating screen, with openings sized to retain the parts, shakes the media through and transports the finished part to the front of the machine. The lower screen accepts the separated media and classifies the media as it is transported to the back of the machine and into the waiting loading hopper.
Process Lab Support Let us prove to you the efficiency and effectiveness of Roto-Max® equipment by processing a sample of your parts to your specifications at no charge.Your sample parts will be analyzed and our processing laboratory specialists will select the right process, the right finishing machine, the right media and the right ROTO-BRITE® compound.Following the test run, for which you are invited to be present, test results, including documentation, will be provided. We will then recommend the finishing system precisely suited to your requirements.Ask your Hammond Roto-Finish distributor for details about this free sample finishing service. 
Up-Flow® The Roto-Finish Up-Flow® is the premier design in centrifugal disc finishing. Utilizing centrifugal force, the Roto-Max® machines produce fine finishes with a minimum of operator input and at rates of 3-10 times faster than vibratory finishing equipment. At the heart of this design is the upward flow of fluid through the precision-machined seal gap. This is the zone where the spinning rotor makes the transition to the stationary sidewall or wear ring that results in the toroid action. This critical zone is factory machined to a gap of .012" and .003" maximum run out. Creating this precision is done for a reason. A precision seal gap allows for symmetrical fluid flow and hydrostatic balancing of the rotor, necessary for an Up-Flow ® design. 
In the mid-80's, Roto-Finish imported a European built centrifugal disk machine. The shortcomings of the down-flow design soon became apparent. Excessive seal wear was inherent in that design. All particles (metal fines, expended abrasive grit and bond) flow through this gap eroding it continuously and quickly. Rather than patch the problem by developing an adjustable seal mechanism, Roto-Finish embarked on a new design that eliminated it. This is the highly successful Up-Flow® which many of our customers now employ. In the Roto-Max® design, the process fluid or solution enters the machine through the seal gap at a rate of at least 10 gallons per hour per cubic foot of capacity and while processing, carries these contaminants out of the side bowl drains and, at the end of cycle, through the patented center drain. With older, inferior designs, the solution flows in over the top of the mass and forces the drainage of contaminants through the seal gap. This causes excessive wear of the gap area. An adjustable seal is not an advancement but a patch over a very old design flaw. The seal gap in the Up-Flow® can’t wear. It sees nothing but water and compound. Down Flow The down-flow is old technology and has a number of process drawbacks. The mass tends to run drier and thus provides less cushion and promotes higher media wear. The net result is an excessive amount of media sludge, fines, chips and abraded part material flowing through the critical seal gap. The pressures generated in this flow by gravity and the spinning rotation causes erosion of the seal and the lower drive housing for the rotor and the bottom cavity wall. In addition, using the seal gap as the drain retains fluid in the bottom of the rotor. This makes for "sloppy" processing when the machine is emptied and creates a sludgy start up condition when the next process is started. Some down-flow designs drain through the bottom of the rotor to reduce this sludge retention, however the sludge still drains into the cavity below the rotor and creates wear problems for the drive seals and drive shaft. 
Why don’t more people build Up-Flows®? Simple; Roto-Finish holds the patented design so they can’t employ it. Our customers have never had a seal gap failure on one of our machines. In fact, in nearly 15 years of production we have not had a single instance of seal failure due to normal wear. This is a testament to the strength and durability of the Roto-Max® Up-Flow® design.
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