care_usage

Wheel Care & Usage

Diamond and CBN Wheel Care and Usage

For achieving the best results using Newman Diamond and CBN products, the following steps -mounting, truing, dressing - should be followed.

Mounting - putting wheel on machine spindle

Examine wheel flanges and spindle carefully.
Inspect machine spindle for excessive runout.
Mount wheel between hand-tightened flanges.
Using a dial indicator, tap the wheel lightly with a rubber or wooden block to minimize runout to less than .0010".
Tighten flange securely and recheck with indicator.
Allow a newly mounted wheel to operate for one full minute before grinding.

Truing - making wheel round and concentric with the spindle axis

Prior to truing the wheel, run a wax crayon over the wheel face.
Any crayon left on wheel face after truing will reveal untrued areas.
Newman Brake Controlled Truing Devices are most commonly used to true diamond and CBN straight, cup and cylinder wheels.

Always use Brake Controlled Truing Device dry.
Bring the Diamond/CBN wheel and the truing wheel together until they almost touch.
Make sure the truing wheel is spinning at time of contact.
Traverse the wheel back and forth at 30 to 60 inches per minute.
Downfeed .0005" to .001" at the end of each traverse.
At the end of truing, the Diamond/CBN wheel should be smooth and in truth.

Dressing - opening the face of a trued wheel

Dressing sticks should be one or two grit sizes finer than the Diamond/CBN wheel.

Trouble Shooting Guide
Problem	Possible Cause	Suggested Correction	Problem	Possible Cause	Suggested Correction
Burning (excessive heat)	Wheel loaded or glazed	Dress wheel with a dressing stick	Poor finish (con't)	Poor coolant flow or location interface	Apply heavy flood so it reaches wheel/workpiece
	Excessive feed rate	Reduce infeed of wheel or workpiece	Chatter	Wheel out of truth	True wheel, ensure it is not slipping on mount
	Wheel too durable	Use freer cutting specification or slow down wheel speed
	Poor placement of coolant	Apply coolant directly to wheel/workpiece interface
Poor Finish	Excessive dressing	Use lighter dressing pressure; stop dressing as soon as wheel starts to conusme stick rapidly	Short wheel life	Incorrect coolant flow	Apply coolnat to flood wheel/workpiece
	Grit size	Select finer grit sizes		Low Wheel speed	Increase wheel speed
				Wheel too soft or too hard	Change grit or grade, use higher concentration

Please email newmanwheel@newmanwheel.com with any questions