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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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Abrasive discs. Rants and raves :)
I am getting a 12" aluminum disc next week and need to buy some abrasive discs.
Right now I have 9" beveled disc from Rob Frink. Here what I have problems with: 1. Because my 9"disc is beveled klingspor discs I get from Pop's (they have thick backing) don't want to lay flat against disc unless I spray a lot of glue. Regular sand paper confirms to the disc's shape perfect but sometimes paper back gets stuck to the disc and I have to clean it with alcohol. 2. Another problem is with wide (2" or more) blades. Because beveled disc makes grind not flat but somewhat hollow I have to spend more time handrubbing to remove valley in the middle. 3. I am using my disc only to make sure my grind is flat. So my grinding time is short compared to belt grinding. Still I feel that disc stop cutting aggressively after literally 5-10 second of grind time. I want more grinding time out of one disc. BTW I am using my disc only on HTed blades Next week I am getting a new 12" and hope that it'll solve at least some of these problems. Any advise is very welcome. P.S. I found a great way to clean abrasive discs. Just spray A LOT of WD-40 on it. Disc will throw off WD-40 all around along with metal dust. It is sure messy but WAY better that rubber stick. Also with WD-40 blade won't get as hot. Last edited by alexkuzn; 07-29-2006 at 11:10 AM. |
#2
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I had two 12" discs, one a stand alone unit which I recently sold and another that is on my 6x48 belt sander. My experience with them is very much the same as yours with the 9" disc. They are not convenient to use, they get too hot too fast, and the grit quits almost instantly. I know there are many people who swear by their disc sanders and I wish them all the luck in the world with them . But, for me, they are a complete waste of time and money when it comes to blade grinding.....
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#3
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The only thing I use my 9" disc for is to dovetail my bolsters and handle material.
__________________ Tom Militano |
#4
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I always wanted to have a disc to make sure my grind is straight and flat. While grinding I quickly jump to the disc and within a couple seconds of grinding I'll see all high or low spots if any.
How do you guys find and fix high/low spots? Handrubbing? Thanks, Alex Last edited by alexkuzn; 07-30-2006 at 12:50 PM. |
#5
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Alex, I use disk sanders. I have two, but I run reduction on mine. I use one that is 30:1 reduction, and the other one is running 58:1. I found the slower the disk runs, the more control, less heat, and longer abrasive lasts. I don't have a surface grinder, so I use these disk sanders more for honing than for grinding the flats. I use 36 grit up to 2000. I haven't made a knife that I haven't used them on. The 30:1 (I have a pic here for you to look at), is used on 9 inch blades and below. The 58:1 I use it on my long blades. I've used them since I started making knives. I use automotive abrasive, but my disks are only 9 inch. I don't have access to 12 inch material.
Jerry |
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blade, knife, knives |
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