Just can't get this grind - any tips?

cbr900son

cbr900son

Joined
Mar 3, 2011
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Well ive been working on practicing a big curved plunge line and just can't seem to get good results :( Any tips or suggestions?

This is what im aiming for something like thi

k03n.jpg
 
If it were me I would do a traditional flat grind with the plunge stopping at the beginning of your arc, then work the plunge with either a 12in disk or a 4.5 inch angle grinder with sandpaper flap wheel on the grinder.
CW
 
Blindhogg's comment is interesting: I've often wondered if Rucker (pretty sure that's a Rucker in the photo) uses a hand held grinder, the radius is pretty consistent from knife to knife and it looks like it matches about a 4" wheel.
 
Remember that on that type of grind there is no cutting edge formed for a bit of space in front of the starting place of the grinding. In other words, pull your blade faster to begin with. No need to changes angles of any sort. This does use up a lot of blade length. Frank
 
If I remember right some were using the edge of the wheel with the belt tracked off of it. Use that corner and cut it out with it,
 
Nicely done William. There has been several posts in the last year regarding sweeping plunges. I think Salem's grinding page has the best advice to get you started.
 
That is looking good!

I think you already have it!

For those who are trying a sweeping plunge I think the best tip is to hang a stiff belt of the platen a decent ways to work your plunge. I'd use 1/4" of hang off on the belt to a fair bit more. These can be tricky to finish, sometimes doubling a finishing belt over a stiff belt will help.
 
Yeah its only done to 80 grit and I was thinking last night when I stopped "this is gonna be a bitch to clean up!" lol
 
Gators work pretty well for cleaning up swept plunges I have found in my limited experience. They are stiff like ceramics.
 
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