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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 04-06-2015, 09:59 PM
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First hollow grind

I did my first hollow grind last night. I cleaned it up a little tonight but here are the results.



 photo BEE050F6-59B9-4EE2-BE88-E13C1BC7F845_zpslgcgld9s.jpg



 photo C1B66762-0740-414E-B0E9-F29D92202BA9_zpstjxblrxe.jpg


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Last edited by mwhuston; 04-06-2015 at 11:18 PM. Reason: fix pictures
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Old 04-06-2015, 10:26 PM
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Pics are posted in your photobucket account , tiny tiny to view


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Old 04-06-2015, 11:18 PM
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I reloaded the pictures.


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Old 04-07-2015, 08:35 AM
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Pretty darned good for a first effort...


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Old 04-07-2015, 10:05 AM
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I reloaded the pictures.

lookin good Mark


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Old 04-07-2015, 10:32 AM
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Question: I've been using 1/8" 1084. Is it easier to hollow grind thicker steel?


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Old 04-07-2015, 12:01 PM
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Hey man good job so far. I've been using 5/32 and it is pretty easy to hollow grind. I've been wanting to try some 1/8 with a hollow grind I just haven't yet


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Old 04-07-2015, 12:24 PM
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QUOTE: Is it easier to hollow grind thicker steel?

Tough question. The thickness of the metal is less of an issue than the width of the blade. I can do a very nice hollow grind on 3/32" blade as long as its a pen knife sized blade. 1/8" is also easy in blade up to about 3/4" wide, maybe 1" .
The thicker the steel the easier it is to hollow grind a wide blade BUT all that is directly related to the wheel diameter you use. Any diameter can be used on any blade but you won't always get the desired result. My 10" wheel on a 3/32" pen knife blade produces a grind very much like a flat grind, which is why I use a 5" wheel for that job.

A lot of the answer depends on what you think about grinding 1/8" steel isn't 'easy' ....


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Old 04-07-2015, 12:44 PM
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QUOTE: A lot of the answer depends on what you think about grinding 1/8" steel isn't 'easy' ....

I guess it is just hard learning like everything else.. :-)

I was afraid 1/8 was too thin because I struggled with getting too close to the edge too quickly. I'll keep practicing


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Old 04-07-2015, 01:14 PM
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Getting too close to the edge too quickly is a common problem. It gets easier with practice but never goes away completely. One thing that helps in the beginning is to scribe your center line about 5 thou short of the center, then run the scribe down both sides of the blade creating two scribe lines. When you grind try to touch the line without going through it. If you do cut the line (and you will) you'll still have a little buffer room left. This technique is helpful when learning but eventually you will want to scribe a single line in the center because a double line just makes it harder to get a really thin edge.

Also, just like you saw in the flat grind video (the chef's knife) establish your grind a little bit above the edge. Concentrate on working the grind UP the blade instead of down to the edge. As you progress the grind will naturally move down so keep an eye on it, just concentrate on going up instead of down. Ideally, your grind will reach the desired height at about the same time it reaches the centerline ...


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Old 04-07-2015, 01:21 PM
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Good job Mark.

What is the diameter of the contact wheel you are using?

Dan
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Old 04-07-2015, 03:09 PM
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Good job Mark.

What is the diameter of the contact wheel you are using?

Dan
8" wheel


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Old 04-07-2015, 09:32 PM
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OK. I took the ideas above and tried again. I'm pretty happy with this result. I did get it a little hot on the edge, but I think it will be ok. Ray: Working from the edge up was a good idea. That helped to keep from getting too close to the edge. I'm going to HT this one and put a handle on it. I'll give it to a friend to test.

 photo 06F8CEAE-AB68-4F51-B2B2-67BC52E32DA7_zpswmmwrcbz.jpg

 photo FC0FD598-08AA-4A22-90DB-10E85B2729DD_zpsy9apnyrj.jpg


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