A while back I bought a few different parting blades from KBC Tools. Didn't know they were crap chinese and india when I ordered them.
Anyway,.........I was setting one up the other day and noticed that the top which is more a T than a P and I don't know why they call them P type but the T top was more pronounced on one side than the other rather than being centered like in the picture below.
One side was almost flat or flush to the side of the blade and neither side is tapered like in the picture.
The blade I was setting up is 11/16" x 3/32". I also noticed that the top measured .095 and the bottom measured .090.
Not much of a taper considering you have to split that difference to allow clearance on both sides of the blade when parting deep or when the bottom of the blade starts to enter the groove. For shallow cuts it's not an issue.
Most guys seem to think, or it seems to be common practice with out much thought that when you set one of these blades in an Aloris tool holder that you just firmly hold the blade against the slot in the tool holder and tighten the wedge and your golden.
Not so........... in fact usually the wedge moves the blade out from the side of the tool holder slightly. This may be due in part that some of these cheap blades are not ground square meaning the top and bottoms are not square to each other or are ground with a slight taper. I really can't tell if my tool holder slot is cut with a slight taper or if it's cut square to the bottom where the blade sits.
What I have to do is adjust the blade so there is an equal gap at the bottom to allow for clearance on each side and then give it the final snug.
Anyone else ever notice this?????