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I just got my Tormek T8 last night and I was trying it out on a few cheap knives but I am a bit confused on the anglemaster tool.  I was sharpening a couple of pocket knives.  I understand that the ideal angle for a knife is around 20 to 25 degrees.  Is that angle from the centerline of the knife to the edge or from edge to edge?  For example if it was a 20 degree angle would it be 20 from one edge to the center and then another 20 degrees from the center to the other edge for a total of 40 degrees?  Or is 20 degrees the total angle (10 degrees each side of center?)

Then on the anglemaster tool there are two sets of numbers.  Which number do I set it to if I want a 20 degree angle on the knife?  (Do I use the bottom line 20 or the top line 20)  Or do I need to do set it to 10? (10 +10 on each side = 20)

I know these may be stupid questions but I am just having a hard time understanding the angles in my head.

Thanks

I am looking to get a new sharpening system and I like the T8 for multiple reasons.  I plan to primarily use it for knife sharpening and after I get good I would like to have a side gig for sharpening knives.  What accessories would you recommend to start out with?  I have seen quite a few posts about the FVB.  It looks like that is an accessory that is not put out by Tormek, is that correct?  How beneficial is the FVB to being able to put a good repeatable edge on a knife? 

Thanks for the advice.  I am learning more about this every day.