I've seen shops try to do there own on a grinder and just ruin a set of blades. Seriously this is not a do it yourself thing, if you use them for a busy shop. The proper angle of the blade from both side to side and to front to back helps to keep them cutting sharper better, longer.
I have a friend that fortunate for me is the head of tool maintaince at an aerospace company.
I just trade him a ball at cost for doing a full set, plus 3 other insert bits.
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Timothy @Juniors Pro-Shop
Roto-Grip Star Proshop
Etonic Stabilites Dress wearer.
Staff Writer 7-10 Split Magazine,EGO Communications
Montreal, Quebec.