U.S. Stoneware’s unitized jar mills are engineered for economy, compactness and mobility. Assured reliability results from all welded steel frames, powerful roller chain drives, and pillow blocks with cartridge-type permanently sealed ball bearings for efficient operation.

All jar mills are built with special no-creep roll design. One roll is convex, the other is concave. Jars stay centered, won’t work off rolls. No clamping or fastening of jar is required. Three-position adjustment securely mounts idler roll, yet it can be quickly changed to handle standard size 000 through No. 2 Roalox jars or other round containers 2" to 9" in diameter. Rolls are 2" in diameter and made of long-wearing, oil, solvent and chemical-resistant Neoprene rubber; they bleed off static electricity generated by rotating jars. Spare parts are available from stock.

Long roll jar mills are designed specifically for applications where space is at a premium. Available in single and multiple-tier models. Roll lengths: 36, 48, 72 inches.

Motors - Mills are furnished with motors and drives under rolls, TEFC or Explosion Proof.

• Totally enclosed DC drive motors permit solid-state-control of roll speed. Machines have speed range of between 50 and 300 RPM
• Rolls mounted in ball bearing pillow blocks
• Rolls are 2-1/2" in dia. Made of long-wearing, oil, solvent and chemical-resistant Neoprene rubber; bleeds off static electricity generated by rotating jars.
• Free-turning ball-bearing jar stops mounted at each end of drive rolls assure jars remain on rolls.
• Jar positioners made of long-wearing polyurethane are available at extra cost for any long roll jar mill. They keep jars separated, positioned exactly. Simple to install, quickly moved to any position.
• Three-position lateral spacing adjustment of idler roll allows mills to handle standard size 000 through No. 6 Roalox jars or round containers from 2" to 15" diameter.
• Options: Digital Tachometers, automatic timers, and jar positioners.
• Spare parts are available.
• Explosion-proof model has constant speed of 290 RPM

1. 3-position lateral adjustment for idler roller.
2. Free-turning ball-bearing antifriction jar stop.
3. Lifetime lubricated and sealed ball bearing.

• Positive lid locking bar and hand wheel for quick, easy opening and closing. Precision ground cover and gasket seat assure leakproof fit.
• Wide mouths for fast emptying, cleaning, loading.
• Gaskets are oil, solvent and chemical-resistant Neoprene rubber.
• Inside surfaces are unglazed.
• Options: Solvent-proof Solvoflex (water soluble PVA). Viton® and other materials are available for gaskets.

• Same design features as Roalox mill jars.
• Ultra-high fired ceramic body composed primarily of high-grade aluminum oxide.
• Extremely high abrasion resistance, long service life, negligible contamination factor.
• Recommended where silica contamination must be held to an absolute minimum.
• Polyurethane-coated body minimized breakage.
  

Available in 7 standard sizes in stainless steel, with or without internal lifter bars. Easy to use, fast cleaning. Feature wide mouths, curved inside corners.

Model 611 (without Lifter Bars) and MODEL 611L (with Lifter Bars) Unlined Steel Grinding Jars is shown in the picture.

• All sizes have quick-change snap-in liners. This feature is especially significant when varied materials are milled and cross contamination must be avoided.
• Using a separate liner for each material protects the product, saves clean-up time, reduces number of jars required. Note: Cover liners are not snap-in; a different cover is needed for use with each liner.
• Jars are carbon steel.
• Buna-N,EPDM, Low-Ash rubber, Neoprene, and Polyurethane liners are available.
• Model 612A (Low Ash), 612B (Buna-N), 612E (EPDM), 612N (Neoprene), 612P (Polyurethane) Lined Steel Grinding Jars (Specify Lining)
  

High-density, ultra-high fired Burundum® is the ideal medium for wet or dry milling. High specific gravity and cylindrical shape give it greater weight per volume, more contacts per mill revolution, greater area of attrition, with each contact. Result: faster, finer grinding or dispersion, often cutting milling time in half.

• Long wearing, non-contaminizing grinding.
• Tough, hard, non-porous surface is chip-resistant, easily cleaned and unaffected by most acids or alkalies.
• Non-conductive, non-magnetic, with excellent resistance to mechanical and thermal shock.

Zirconia grinding media mills twice as fast as equivalently sized alumina media with only 1/2 the media weight loss and only 1/3 the wear (weight loss) of the grinding jar - with accompanying reduced batch contamination. Available in radius end cylinders, with length equal to their outside diameters.

• 1.6 times denser than high alumina.
• Hard, non-porous surface, chip resistant, easily cleaned.
• Unaffected by most alkalies and acid.
• Non-conductive, non-magnetic, excellent resistance to mechanical and thermal shock.

These hard, impervious spheres, which are heavier than porcelain, mill faster with negligible silica contamination. Wear and chip resistant. Easy to clean.

• Hard, tough, non-porous, chip-resistant surface.
• Unaffected by most acids or alkalies.
• Non-conductive, non-magnetic, resistant to mechanical and thermal shock. Beads available.
  

These units save time, labor and money in applications where mixing is performed by rolling the container. Fully adjustable to roll any round container from a 5-gallon pail to a 55-gallon drum.

Motors - 3/4HP is 115/230V, 60 cycle, single phase totally enclosed. 1HP is 230/460V, 60 cycle, three phase, totally enclosed. Explosion proof motors are available on special request.

• Heavy-duty 6" diameter Neoprene wheels, eight under each drum, can be moved to clear hoops and bungs permitting unlimited latitude in type of container rolled.
• Neoprene wheels bleed the static electricity generated by drum rotation.
• Smooth running ball bearing pillow blocks and solid welded steel base for heavy-duty service.
• Constant speed drive: 144RPM which rotates 55-gallon drum at 37RPM.
  Note: To compute revolving speed of other containers, multiply diameter of wheels by RPM of wheels and divide by diameter of container.
• V-belt and expandable pulley-type variable speed drive allows speeds from 76 to 190 RPM. Speeds can be changed when unit is operating.
• Spare parts are available.
• Options: Motor controls.