The PACER Method of
Paper Mill - Roll Grinding

For proper wheel performance, the machine settings, coolant, dressing, etc. should be as stated. The operator, however, may find other ways for wheels to work as well or better. If the machine does not display roll and wheel speeds, the operator should have a tachometer available and also a refractometer to check coolant concentration.

Pacer manufactures new technology grinding wheels that have earned a wide reputation across North America for stock removal, easier use and roll quality. Operators have seen advantages over shellac wheels and belts. Considering the shorter grinding time, longer life and moderate price, these wheels are a good way to reduce overall costs while achieving higher surface quality.

PM (Paper Mill) resin bond wheels are for fast roughing of all roll types. They self dress, cut freely and have very little chatter tendency. They operate well at high or low amps. Cork filled, rubber bond wheels are for fast finishing of hard rolls. The new Cl2OA3RC formula is a recent improvement. The new wheel removes stock easily and polishes better. Cork wheels reduce the difficult and time consuming job of roll finishing to a matter of hours.

PM Roughing Wheels (.001" to .003" /hr removal)

		A common cause of roll grinding problems is coolant related. Many types have mineral oil, soap, paraffin or silicone lubricants. These can slick the hard roll and load the wheels. RollCool has no Iubricants. Its job is to inhibit rust. Non-foaming. Clear and clean on the roll. Long tank life. Settles fines. Better environmentally.

		Dressing - Use DiaNib or equal coarse impregnated nib for sharper dress than by a dulled single point. A single point often wears flat. DiaNib has many chips imbedded in a metal block. As it wears, sharp points surface. No need to rotate as with single point nibs. It works well on PM and cork.

Miscellaneous - Wheel must break down well in order to cut well. Should be able to see and feel some grit on roll surface. Keep amps up. A new wheel may act harder for an hour or two. If using cork next, make some light passes. 60 or 46 grit PM can finish although cork wheels often finish faster and better. Use 100 or 80 grit PM if same wheel roughing/finishing is wanted. Total time, however, will be longer than with 60 or 46 PM and cork.

60PM works well on all hard rolls such as iron, stainless, granite, stone-like, hard rubber, etc. Use 30 grit PM on soft rolls (over 10 P&J). Rubber (except poly) can be ground dry. PM cuts rubber coolly and should not load.

Cork Finishing Wheel - roughing phase (9/12 passes)

Bypass during roughing and use just during finishing. 18" high 2.5 dia, 25 micron cartridges are replaceable. Housing bowl unscrews for easy cartridge replacement. If possible place not far from discharge nozzle. This type filter prevents swarf or oil in coolant lines from scratching roll or loading face of wheel.

Miscellaneous - Like the PM, cork wheels must break down well in order to remove all roughing wheel marks The use of low lubricity coolant is very important. New formula cork wheels can remove stock (.0003" /hr) and improve profile. Cork leadlines erase in next phase. For a Farrel grinder use Pacer crane to make changes from roughing to finishing wheels quick and safe No lifting.

Special base bolts to the swingrest corner - about 3 ft. from the spindle end. The 65 lb. mast/boom/handcrank assembly drops into the tubular base. Mast swivels in the base so as to swing wheel/mount from the floor up and near to spindle. Wheel/mount slides onto short spindle extension. Boom then can fold or swivel out of way. Secure. strong chain sling.

Cork Finishing Wheel - finishing phase (12/15 passes)

Miscellaneous - Removes marks from roughing phase. If amps drop too fast, deeper scratches and leadlines will remain. Make sure each pass removes leadlines from previous pass. If it doesn't, add an amp or two and make pass again or try a wheel speed change. Finish should be 5 to 8 Ra - with no leadlines. If using a 240 grit, start it after the 120 roughing phase. Finish should be 2 to 5 Ra.

pacer@pacergrindingwheels.com
1-800-225-0315
610-383-4200      Fax: 610-383-4239 
200 Red Road, Coatesville, PA 19320