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The Newbies Arena Are you new to knife making? Here is all the help you will need. |
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#1
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hand sanding
hello all , i have been finishing my knife grinding with the 2x72 machine at 400 grit . then i do my horizontal hand sanding with 400 grit wet paper . im still seeing some deep vertical grooves .should i be starting my hand sanding with a 120 grit them work my way up 100 grit at a time , till i reach 400 grit . thanks don
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#2
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Even with a 400 grit belt you might get some deeper scratches. May have to back down to 320 and see. If that doesn't get them out, you'll have to back down a bit further to 220. Just remember if you don't get them all out with the coarser grit the finer grit's not going to either.
With the belt grinder it is the same....make sure you are getting all the lower grit scratches out before moving up to the next one. __________________ Carl Rechsteiner, Bladesmith Georgia Custom Knifemakers Guild, Charter Member Knifemakers Guild, voting member Registered Master Artist - GA Council for the Arts C Rex Custom Knives Blade Show Table 6-H |
#3
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This only works with flat ground blades but this is the way I do it:
Grind the bevels on the blade with my trusty 60 grit. Naturally, this is grinding across the blade. Next I use 120 grit to grind lengthwise on the blade using my contact wheel. As Carl explained, be careful to remove all the previous grit scratches (which are much easier to see when you grind across them like this). Now, back to the flat platen grinding across using a 220 grit belt. Get out all the 120 scratches. Finally, 400 grit on the contact wheel grinding lengthwise again. Get out all the 220 scratches. That's it, you should have a pretty fair finish by now. At this point, you can do a little hand sanding (lengthwise) with 400 grit or finer if you wish or you can use a ScotchBrite belt (lengthwise) to refine the finish a little more for a nice satin look ... |
#4
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ok thanks crex and ray . ray i only have my grinder set up with a platen . i dont have another grinder with a single contact wheel .
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#5
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Then work your way through the grits as carefully as you can grinding across the blade. You will probably remove more metal that way to get all the scratches out but it is possible to do a fair job. After you're done with the belts you can either leave it that way or try sanding lengthwise by hand.
Christmas isn't far off, a contact wheel makes a pretty nice present .... |
#6
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When you wet sand, the water (or oil) will reduce the depth that the grit cuts into the metal. A good guess is that it cuts it by half for finer grits.
So if your machine dry grinds a groove vertically with 400 grit, that groove will be deeper than the wet sanding with 400 grit that you're doing horizontally, and thus it will take a long time to get down to that depth. I hope that makes sense. __________________ God bless Texas! Now let's secede!! |
#7
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Quote:
60 -220 platen 220 400 600 800 1000 as high as you want grit by hand now thanks to some crazy mad knifemaker my thinner kitchen knives are all post heat treat grinding so that's a little different procedure again........ Rob __________________ R.Watson B.C. Canada |
#8
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QUOTE: now thanks to some crazy mad knifemaker my thinner kitchen knives are all post heat treat grinding so that's a little different procedure again.
Hey! I resemble that remark ...... |
#9
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Quote:
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#10
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ok thanks again guys . and also thanks to you crazy squirrel guy .
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#11
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lol !!!!
__________________ R.Watson B.C. Canada |
Tags |
2x72, back, bee, belt, blade, blades, flat, grinder, grinding, hand, heat, heat treat, hollow grind, kitchen, kitchen knives, knife, knifemaker, knives, make, metal, post, sand, wheels |
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