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CBN wheels...again (Read 265 times)
 
StefanoBastianelli
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Laguna Revo 1836
CBN wheels...again
Oct 15th, 2018 at 1:38pm
 
It's time for me to change my grinder's wheels and I was considering going with CBN wheels. Never tried or saw one in action, except in videos and I have some doubts and questions about which grit to get. I know there are plenty of posts, articles, etc., but reading all the different opinions has been a little bit confusing and I have a couple of scenarios opening a this point.
I like to reshape my tools once in a while and making new ones by myself so I thought that probably the 80/180 grit two CBN wheels configuration would have been the best choice.
Then I started to think about getting also a new grinder for the new wheels and keeping the old grinder with AO wheels because once in while I also use it with no hss metal, so I will have an AO wheel for reshaping tools.
In this case, so which CBN wheels grit for the new grinder? 180 and 360/400/600? If the 180 is good enough to give you a nice sharp edge on your tools, do I really need a higher grit? Or for scrapers the 180 is not enough and I really need that 80 grit wheel?
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Allan Miller
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Re: CBN wheels...again
Reply #1 - Oct 15th, 2018 at 7:08pm
 
I went with 180/360 on my new grinder and left the 80 on the old one for reshaping. Only time I ever use the 180 now is when I reshape one before putting it on the 320 for sharpening. The 320 puts a very good edge on my tools.
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David Hamann
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Re: CBN wheels...again
Reply #2 - Oct 16th, 2018 at 3:08am
 
This Topic was moved here from Turning Talk by David Hamann.
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Ed Weber
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Re: CBN wheels...again
Reply #3 - Oct 16th, 2018 at 8:31am
 
Allan Miller wrote on Oct 15th, 2018 at 7:08pm:
I went with 180/360 on my new grinder and left the 80 on the old one for reshaping. Only time I ever use the 180 now is when I reshape one before putting it on the 320 for sharpening. The 320 puts a very good edge on my tools.


That's almost exactly what I was going to suggest..
Keep in mind that you only purchase CBN wheels one time. They stay true and don't wear, this give a reliably consistent grind every time.
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StefanoBastianelli
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Re: CBN wheels...again
Reply #4 - Oct 16th, 2018 at 10:53am
 
Thanks guys. So the 360 for sharpening gouges and skews, the 180 for scrapers?
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robo_hippy
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Re: CBN wheels...again
Reply #5 - Oct 16th, 2018 at 11:15am
 
If you are getting only one, then the 180 will do for 90% of what you will need. For a second one, I would go with 600. I do have a 320 grit wheel, and don't have a lot of time on it. Main reason to skip up to 600 is that the 320 isn't really a big jump from the 180. The 600 does provide a good clean edge for difficult tear out prone wood. For the skew chisel, you still need to hone it to remove the burr. The 180 does leave a nice burr on scrapers, and I can't really tell any difference between the 80 and 180. The 180 is generally good for minor reshaping. If you have serious reshaping to do, like starting from a square end blank that you want to turn into a skew chisel with your own special profile, you need a 36 grit belt sander, or a lot of time. Even the 80 grit is fairly slow on that. Some saw sharpening shops will have that, or keep a 36 grit wheel around just because... Other than that, you need a good grinder to push these heavy wheels. Best bargain out there is the Rikon 1 hp grinder. The smaller 1/2 hp one just doesn't have the guts to push that much weight... Of course, you could have 2 or 3 or 4 grinders, all with different grits..... There is no end to the vortex, well, maybe no bottom.....

robo hippy
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StefanoBastianelli
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Re: CBN wheels...again
Reply #6 - Oct 16th, 2018 at 11:21am
 
Thanks Robo. That was my thought about the difference between 180/3XX
Well, there is an end in the amount of space in my garage Smiley
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« Last Edit: Oct 16th, 2018 at 11:22am by StefanoBastianelli »  
 
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John Grace
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Re: CBN wheels...again
Reply #7 - Oct 16th, 2018 at 8:01pm
 
I use a 180 for my scrapers and a 320 for all my gorges and skews.  Woodturner's wonders typically has aggressive pricing.  They're worth the change.
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