Stainless steel plates on the concave place there are always several neat concentric arrangement, is the trace of processing?
Is processing, if you have a chance, can look at the lathe machining process, has been processed parts are cut off from the bar, will leave a little head,
Need to use grinding machine burnish drops. Plates should be use milling machine processing, will also leave processing.
Cloth is on the bench drill, grinding head, grinding paste with artificial processing.
