Cast Iron, Steel Hard Bronze and Stainless Steel
Timesaver Compounds absolutely do not embed or charge into any metal surfaces. Therefore, do not attempt to make a lead, copper or other soft metal laps to lap hard metals, as is done with emery, ground glass, silicon carbide or other similar charging abrasives. The lapping plate should be at least as hard as the surface to be lapped and harder if possible. The softer of the two metals will get the most wear.
Do not use Hard Metal Compound (Green Label) on Babbitt, brass, aluminum or bronze. For this work, use our soft metal compound (Yellow Label). Timesaver can be used on any hard metal friction surfaces where accurate fits are required, such as valve seats, machine tool wars, tool room applications, etc.
Timesaver Lapping Compounds are formulated to first act as an abrasive, then diminish to a polish and finally to inert material. Other ingredients in the compound conglomerate the fines to prevent embedding in the metal being lapped.
All compounds have a range of particle sizes with most of the work being done by the largest particles. The selection of the grade depends more upon the amount of metal to be removed than the finish because of the abrasive breaks down to a finer and finer size and eventually to a polish material.
Gear Units – Mix Timesaver compound with heavy oil or grease in proportions of one part Timesaver to three parts of oil (by volume). It is preferred to protect the ball or roller bearings by the use of shields or by covering with grease.
It is customary to leave the cover off the gear case for convenient inspection and application of the lapping compound. Bearing races should be held in place by bolting down with blocks. Relatively heavy brake loads should be applied to ensure firm tooth contact and to speed the lapping action.
Apply the mixture across the face of the gear every few minutes, alternating with a clear oil to ensure that the mixture does not become dry or gummy. Lapping speeds should be as fast as possible without throwing compound from the gears.
Occasionally check the lapping action by wiping off several gear teeth and noting the area of contact. When the proper fit has been obtained, flush out the gear case with diesel oil or Stoddard Solvent.
Cast Iron Bearings – Mix our Hard Metal Compound with a light engine or cutting oil to the consistency of a thin paste. The mixture should be thick enough to stick to the bearing surface.
Just before placing the shaft in the bearing, add oil to surfaces in order to thin the compound to proper lapping consistency. Bolt up the cap – not too tightly, just so the shaft can be turned by hand – and proceed to lap.
At intervals add oil and take upon bearings gradually as high spots are removed, applying fresh compound if necessary. When a full-bearing surface has been obtained, tighten the cap to the final fit, add a few drops of oil, and continue to lap for a short time, before removing the broken-down compound.
This operation produces the final finish and proper running oil clearance, which should not be changed or varied after the bearing has been flushed out with diesel oil or Stoddard Solvent for final assembly.
Green Label lapping Compounds
Removing tool and cutter marks, and high spots from new steel and hard bronze gears; lapping-in rebored cylinder walls, noisy gear units, or new replacement gears; extreme precision fitting of small steel parts and similar uses.