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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  
Old 08-21-2014, 05:51 PM
donnymac250 donnymac250 is offline
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Question 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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Old 08-21-2014, 06:00 PM
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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.


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  #3  
Old 08-21-2014, 06:31 PM
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Ray Rogers Ray Rogers is offline
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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 ...


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Old 08-21-2014, 09:51 PM
donnymac250 donnymac250 is offline
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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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Old 08-22-2014, 08:19 AM
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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 ....


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Old 08-22-2014, 10:34 PM
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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.


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Old 08-23-2014, 08:29 AM
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Quote:
Originally Posted by donnymac250 View Post
ray i only have my grinder set up with a platen . i dont have another grinder with a single contact wheel .
Donny I only use my platen unless a hallow grind is the request, then I'll hollow grind with wheels.......just me

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


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Old 08-23-2014, 09:10 AM
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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 ......


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Old 08-23-2014, 11:21 AM
donnymac250 donnymac250 is offline
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Question

Quote:
Originally Posted by BCROB View Post
Donny I only use my platen unless a hallow grind is the request, then I'll hollow grind with wheels.......just me

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
you only use 2 belts 60 and 220 when flat grinding on your platen ? then the rest are all done by hand . you do not use a 400 grit on your grinder ?
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Old 08-23-2014, 11:22 AM
donnymac250 donnymac250 is offline
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ok thanks again guys . and also thanks to you crazy squirrel guy .
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Old 08-23-2014, 07:57 PM
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Quote:
Originally Posted by ray rogers View Post
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 ......
lol !!!!


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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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