liamh Posted October 29, 2013 Share Posted October 29, 2013 Hi everybody. Ive only flat ground my blades so far, but i want to start hollow grinding some straight razors. During my forging process i forge all bevels in and clean them with a flatter before i start rough grinding. My question is, do i need to forge in an edge bevel for hollow grinding or do i need to just forge he knife shape without bevels? Quote Link to comment Share on other sites More sharing options...
Rich Hale Posted October 29, 2013 Share Posted October 29, 2013 I hollow grind bars that are flat and have parellel sides. i leave enough of an edge ,,about a dimes thickness to help wredouce warpage in heat treat. I have forged one straight razor. I ground the hollows after heat treat. If youi wish to see how I hollow grind i did a bp,,0235 and it is in the blade making lesson on here....Not likely to retype all of in this wee box. Quote Link to comment Share on other sites More sharing options...
Dan C Posted October 29, 2013 Share Posted October 29, 2013 Have you visited straightrazorplace.com? Not that you won't get your question answered on IFI, but as straight razors are all they do there's a wealth of information. Quote Link to comment Share on other sites More sharing options...
liamh Posted October 29, 2013 Author Share Posted October 29, 2013 I hollow grind bars that are flat and have parellel sides. i leave enough of an edge ,,about a dimes thickness to help wredouce warpage in heat treat. I have forged one straight razor. I ground the hollows after heat treat. If youi wish to see how I hollow grind i did a bp,,0235 and it is in the blade making lesson on here....Not likely to retype all of in this wee box. So you reccomend stock removal for small hollow ground blades? Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted October 29, 2013 Share Posted October 29, 2013 Are you doing it freehand or with a jig? Quote Link to comment Share on other sites More sharing options...
liamh Posted October 30, 2013 Author Share Posted October 30, 2013 Are you doing it freehand or with a jig? I was going to do it freehand untill i figured out a jig for it. Quote Link to comment Share on other sites More sharing options...
Loneforge Posted October 30, 2013 Share Posted October 30, 2013 Quote Link to comment Share on other sites More sharing options...
rockstar.esq Posted October 30, 2013 Share Posted October 30, 2013 It's an interesting question. I wonder if fullering in the hollows would help or hinder. I suspect that if you're freehand grinding, the fullered hollow would track easier. It would reduce the amount of stock removed via grinding. That being said, the uniform thickness of a flat blank would tend to heat treat more evenly. I've seen videos of smiths fullering grooves in sword blanks that were later ground for finishing. I don't know if that translates as well to something as small and thin as a straight razor. One jig I saw a while back was nothing more than a stepped metal dowel clamped to the tool rest. The dowel was placed perpendicular to the wheel's movement. The back of the blade was set in the step and the edge was rotated towards the contact wheel till it started cutting. Moving the blade laterally cut the hollow. Since the dowel only made contact at a single point, it allowed a smiling razor to be ground by simply keeping the dowel's contact point perpendicular to the curved spine. Of course the single central pin allowed both sides of the blade to be ground symmetrically without moving the jig. Quote Link to comment Share on other sites More sharing options...
liamh Posted November 1, 2013 Author Share Posted November 1, 2013 I think i will start with flat stock and try that round rod jig! Thanks for the help Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted November 1, 2013 Share Posted November 1, 2013 Freehanding I have always found a "starter fuller" to make it easier. Doesn't have to be much to leave room for "correction" Quote Link to comment Share on other sites More sharing options...
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