microfor hp4 the hp4 basis, designed for high volume production, is available with the edm technology or high speed drilling spindles, depending on your request. main topics: for high volume production command based on in......microfor hp4 the hp4 basis, designed for high volume production, is available with the edm technology or high speed drilling spindles, depending on your request. main topics: for high volume production command based on industrial pc specific technology of micro edm with 4 independent sarix generators rotation of the electrode while machining to optimise hole geometry, quality and drilling speed control device to automatically adjust the process parameters machining with tungsten-carbide, brass or copper electrodes central cooling with tube electrodes