Lapping with cinder block

Nfd538

Nfd538

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Jul 9, 2015
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Saw some videos on lapping Edge Pro stones on ceramic tile and thought I'd try that. Then heard about using concrete and figured, hell that sounds good too. So I pulled out an old cinder block and went to town.

Marking the stone with pencil

After about 30 seconds of lapping

Nice and level

All stones good to go

Super easy and cheap (free) way of doing it.
 
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Did you check the cinder block with a real straight edge first? Just because it looks flat doesn't mean it is. That would be my only concern

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That appears to be a concrete block, rather than a cinder block.
 
Please don't tell me those are Shapton stones.
 
Shapton Glass stones should be given better care than that. They can be sensitive to lapping and especially so with an overly coarse surface. It's not that bad with really coarse grits but causes excessive wear to finer stones (500 and up) and does not provide the correct surface texture which is very important with the Shapton Glass stones.

I would highly recommend coarse silicon carbide powder for stones under 500 grit and a diamond plate or some finer SiC powder for the finer stones. It WILL make a difference in comparison to what you are using now.
 
Jason B. said:
Shapton Glass stones should be given better care than that. They can be sensitive to lapping and especially so with an overly coarse surface. It's not that bad with really coarse grits but causes excessive wear to finer stones (500 and up) and does not provide the correct surface texture which is very important with the Shapton Glass stones.

I would highly recommend coarse silicon carbide powder for stones under 500 grit and a diamond plate or some finer SiC powder for the finer stones. It WILL make a difference in comparison to what you are using now.
Click to expand...

I thank you for the insight. I'll look into something better soon.
 
That sic powder on glass always did the trick for me, for the finer stones you only use them with the sic slurry after it has broken down a bit.
 
Cool. I'm glad you got good results on those nice Shapton stones.

I'm a big fan of ghetto/improvised/field sharpening and such. Been lapping my Norton on the sidewalk for years now. Always worked fine for me.

While I agree with using the best tool for the job, it's nice to have the ability to use whatever is available when money or resources are limited.

Knives have always represented self sufficiency and survival to me, thereore I enjoy keeping that spirit with my philosophy of use.

Very noice!

Thx.
 
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