Recommendation? Best grit for a 1x30

T

Triple Stripe Knives

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Apr 24, 2020
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I've been using 36 grit Combat Abrasive Shredder belts with my 1x30, grinding a lot of post HT Nitro-V. I ran out of 36 grit belts recently, and used a 60 grit I had bought but not used. I noticed it stayed sharp for quite a bit longer than the 36 grit belts. This seems kinda counter intuitive since I would've thought that a coarser belt would stay sharp longer.
What I'm asking is what would be the suggested grit for grinding bevels on a 1x30. I'm concerned that the 1/3hp motor on my grinder isn't powerful enough to effectively utilize a coarse ceramic.
My options are 36 grit, 50 grit, and 60 grit.
Thank you
 
it also depends on that the belts are made of. ceramic lasts longer than aluminum oxide. the motor should not have any additional trouble with a ceramic that i am aware of. was the 60 grit the same abrasive ? i would start with the 36, then go to 60 grit.
 
I keep 120 grit zirconia belts on my 1x30. But I only do light profiling of hard to reach areas and general grinding of various parts with mine. Seeks to be a good all-round belt for general use.
 
Ceramics need speed and pressure to reach their full potential, so it's possible that you're 36 grit is just glazed over, or you may have also scraped a lot of the grit off during use if you your grinding against a sharp corner, for instance.
 
john april said:
it also depends on that the belts are made of. ceramic lasts longer than aluminum oxide. the motor should not have any additional trouble with a ceramic that i am aware of. was the 60 grit the same abrasive ? i would start with the 36, then go to 60 grit.
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I use all ceramic belts.
Why would you start at 36 then go to 60? I've never had any trouble going from a 36 to a 120. Why use the intermediate grit?
 
Drew Riley said:
Ceramics need speed and pressure to reach their full potential, so it's possible that you're 36 grit is just glazed over, or you may have also scraped a lot of the grit off during use if you your grinding against a sharp corner, for instance.
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That's what I think happened, I try to start my bevel with an old belt, then go to a new one, but I do notice a lot of abrasive flies off when I put on a new belt. I think that the 1x30 doesn't have enough power to fracture the ceramic abrasive, so they're just glazing over, like you said.
 
I personally have not been impressed with 36 grit ceramic belts for bevels. Deep scratch marks and they do not seem to cut as long as a 50 grit. Maybe a pressure thing for me but I am happy with 50 grit ceramic belts for all my rough work then jump to an A300 Trizact to start refining bevels.
 
Seedy Lot said:
I personally have not been impressed with 36 grit ceramic belts for bevels. Deep scratch marks and they do not seem to cut as long as a 50 grit. Maybe a pressure thing for me but I am happy with 50 grit ceramic belts for all my rough work then jump to an A300 Trizact to start refining bevels.
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That's been my experience with 36 grits, grinding 62 hrc Nitro-V, they don't last, the 60 lasts longer.
 
I’ve used 36 for roughing then go to 80 then 120. The ceramics do seems to glaze over on a 1x30 even with fairly heavy grinding pressure which you don’t overly want or your blade will heat pretty quick with that small belt. But that’s the price you pay for using a piece of equipment like that.
 
Norton Blaze 60grit is my favorite.

They even make em for the 1x30.

I only use 36 grit for cleaning up blank profiles.

60grit stays sharper when cutting the bevels on hard steel.
 
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