VKM 4A

The heavy duty precision grinding machine
for valves up to 50 mm in stem diameter

Application:
Due to the rigid construction the VKM 4A is particularly suited for volume engine rebuilders and high performance shops.

Features:
Machine base:
Heavily ripped cast iron structure for vibration free performance.

Wheelhead:
Box type monobloc casting noted for excellent vibration dampening characteristics. Powerful grinding spindle permanently sealed and lubricated for lifetime accuracy.

Dressing attachment:
The dressing attachment houses in the wheelhead for rapid wheel dressing, also with the valve chucked in the work spindle.Individual handwheel for traversing the diamond dresser across the grinding wheel.

Workhead:
Monobloc work spindle housing with permanently sealed and lubricated spindle bearings. Work spindle fitted with collet chuck for use of high precision collets.The workhead is located on an elongated swivel plate provided with a widespaced scale for angular adjustment. Index stops with micrometer adjustment at 30° and 45°. The workhead is adjustable along the swivel plate to clamp each valve on that part of the valve stem which normally travels in the valve guide. An optional selfcentering steady fits on the swivel plate for additional support of long stem valves. The combination of collet chucking and steadying ensures perfect alignment of long valves. The workhead table is mounted on guide bars to reduce friction for smooth traversing of the valve face across the grinding wheel.

Coolant system:
The baffled coolant tank is housed in the machine base and can be drawn out for ease of cleaning.

Options:
Oscillating equipment
Automated power traverse of the workhead table is available to assure efficient stock removal and superior finish. The stroke of oscillation is infinitely adjustable.

Automated infeed
Power infeed is available for automatic grinding according to a preselected grinding program. The total infeed, the feed rate and the sparkout time are easily selected by the mere turn of code switches.