grinding a tight inside curve?

insanity

insanity

Joined
Feb 28, 2002
Messages
392
Ok so how do you folks do it? Preferably a flat grind. My best thought so far is that the corner of the platten might work, but I haven't tried it yet.

Wayne
 
dont know if this helps but i cut a pipe in about half and welded it to a bit of angle iron i use this as the platten on flat grinds
im working with a 1x42 grinder and the same platten works well for finger grooves using a soft belt sorta like having a small wheel standing on end i can post a picture if you would like
 
Sometimes going back to basics is best. I use files and sandpaper wrapped around dowels.

Trackrock? Sept 24th :)
 
You can also come at the wheel 90 degrees at the bottom. depending on tightness of inside curve. if all else fails use a half bastard file and hand sanding. good luck. :cool:
 
In the old days I did it by hand with a dremmel and one of the flints off of an old lighter. These are pure carbide and fit a handpiece screw shank just fine so I just used them for course removal.

Now I use something more like a small silicon carbide wheel in real tight spots like to form the choil on my folders where the blade folds down nicely over the stop pin when closed. I still do it by hand with my Foredom handpiece but I don't have to break apart old lighters anymore since I started buying the small dental wheels I use. :D
 
Terry_Dodson said:
Butcher-block, i would like to see a picture. :D
Click to expand...
as they say something about wishing and commanding
30700427_a4eaa9a476.jpg

30700428_bdf40dd138.jpg
 
yep next one i do will have less curve and by then the delta will will be just for handles i nee to get a 2x72 soon btw it helps to use a hi flex belt i like the 3m trizact stuff
i have used 36 grit stuff it just doesnt wrap around the platen well
 
I like the rounded platten. What I meant to ask about was grinding the bevel on a blade that is a sharp inside curve, like a claw form.

Mark I don't think I'll be able to make it to Trackrock this year. grrr stupid job.

Wayne
 
Insanity I think I know what you're trying to acomplish.Not being experienced at this type of grind I would attack it by grinding the flat grind inside radius parallel to the face of a contact wheel rather than grinding perpendicular to the contact wheel such as in a "Hollow Grind" technique.I would think that a smaller diameter contact wheel than is typically used in a Hollow grind i.e. 8-14" dia. would be better to use as long as you didn't dwell & create a scallop effect. I use a 10" dia. wheel for my hollow grinding and adjust the grind height by using "Bimjo's Grind Height Widget" Based on the calculations of Rob Frink of BEAUMONT METALWORKS http://bimjo.com/free/widget.html and think that the larger dia. wheel might not work as well in a tight inside rad.,but I'm not sure about that statement,I would have to experiment a little like you I'm sure will too.Thats how I think I would try it.Good luck . :)
 
well i guess i was not thinking about the ame type of grind please let me see what your talking about
 
Hey ButcherBlk,I think insanity wants to know how a Blade style similar to "Witch Claw" by "Blinker" on pg.2 of the fixed blade for sale folder,was ground......I think.... am I correct insanity?
 
The witch claw would be fairly close, but the knife is smaller o/a with a tighter curve to the blade, and for added fun I want to have plunge cuts and a ricasso area.

WS
 
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