Card Scraper Leaving Lines

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Forum topic by Labow posted 02-21-2020 09:41 PM 534 views 0 times favorited 7 replies Add to Favorites Watch
View Labow's profile


5 posts in 73 days

02-21-2020 09:41 PM

Topic tags/keywords: card scraper


First time sharpening/using a card scraper, and I’m leaving lines in the wood when I use it. I can feel that there is roughness to the scraper edge in a few places when I run my fingernail down it, and I can’t seem to get rid of it. My process is to use a file to square the scraper edge, then use stones to smooth it, and then a burnisher to hook the edge. My burnisher is made from a long drill bit.

My file is a hand me down single cut file, and is a bit beat up. Could this be causing my rough edge?
I made my burnisher, and sanded the drill bit up to 1500. There’s no marks on it, so I’m pretty sure it’s not my burnisher, but I’ve read that if the metal that the burnisher is made of is too soft it could create a rough edge. Not sure how hard my bit is, or how to determine that.
Maybe I’m just not using enough pressure when I’m filing/using the stones?
My card scraper is a 6” BAHCO.

Any help would be appreciated. Thanks.

7 replies so far

View Aj2's profile


2789 posts in 2478 days

#1 posted 02-21-2020 10:00 PM

How sure are you that your removing all the file marks from the edge before you draw out the edge and turn the hook.
Files cut pretty deep.

Good Luck

-- Aj

View CaptainKlutz's profile


2701 posts in 2174 days

#2 posted 02-21-2020 10:21 PM

Should not have any roughness in edge? Need to have smooth edge and sides before turning the burr.
Regardless of file used, filing technique has a lot to do with making a smooth edge. Rubbing the file across in proper direction should not leave a rough edge?

Lot of online references available for sharpening a scraper.

If you have trouble handling the file, try this wood magazine method of clamping the file and moving the scraper:

This Fine Wood Working article goes a little overboard on getting a polished edge with stones, but it shows the importance of smooth edge:

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

View Labow's profile


5 posts in 73 days

#3 posted 02-22-2020 12:04 AM

I’ll redo it tonight and make sure that all of the file marks are gone before I turn the hook.
And thanks for the articles. I made a jig to hold the file, so I’m good there, but maybe my technique is off. I’ll give the articles a read and hopefully that will help.

View Tony1212's profile


402 posts in 2414 days

#4 posted 02-24-2020 01:43 PM

I’m rather new to the joys of card scrapers myself.

When you say, “there is roughness to the scraper edge”, do you mean the flat edge, or the hook that you formed with the burnisher? Is the roughness there before burnishing?

I think you’re best bet is to start over (I’ve been doing this quite a few times as I’m learning). Lay the scraper on one side and use the burnisher to push the hook back to flush with the side. Flip it over and do the same to the other side. Then you’re ready to start filing again.

-- Tony, SW Chicago Suburbs

View Just_Iain's profile


320 posts in 1096 days

#5 posted 03-04-2020 01:23 AM

This might help for getting things square.



-- For those about to die, remember your bicycle helmet!

View Labow's profile


5 posts in 73 days

#6 posted 03-04-2020 10:47 PM

The roughness was on the edge of the hook, but I tried a different file that I found that was in better shape and it worked great! no more lines. Thanks for the help

View chrisjk's profile


2 posts in 2377 days

#7 posted 03-08-2020 10:18 AM

You should hone the square edge on a fine stone before drawing out the edge.

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