The class is about halfway through with an agenda of the following:
Sharpen four chisels
Sharpen a card scraper
Tune and Sharpen a Smooth Plane
Tune and Sharpen a block plane
S4S boards with hand tools
Make dovetailed box with mortise and tenon handle.
So far we have finished our chisels and card scraper and worked a bit with the chisels. Our instructor has given demos on how to tune a plane as well.
Sharpening A Card Scraper
For the last two weeks Kristin and I have been sharpening our card scrapers. This was one of the things I have been interested in learning.
I started out with an old Two Cherries scraper that I had done unspeakable things to. Kristin bought a new Bahco.
We took two different paths to scraping. She spent lots of time lapping her scraper and I rushed through it (ten times). In the end I got a 19 out of 20 on my scraper and she got a 20.
Here is the basic process with photos
Step 1: Draw out the old hook.
Oil the burnisher and scraper. Set the scraper on the bench top and press down and diagonally across towards the edge a few times. Feel that any old hook has been compressed.
The idea here is that the hooks will now be pushed up by the burnisher in prep for jointing.
Step 2: Joint.
File with a single cut file set at 90 degrees. We chucked the file in our vise and pulled the scraper across it. Inspect the edges of the scraper for a nice even grind. (Some people stop at this step and use the scraper which now has a square edge.
Step 3: Lap
Using waterstones or other sharpening surface, lap the scraper. Kristin worked on hers for a long time (hours). I did as well. After jointing with the file there is a rough hook that needs to flattened. Move up through 4000 grit.
After the first sharpening this wont be a big deal. Notice that a wood block is being used to keep even pressure on the scraper.
Step 4: Hone edges
Holding the scraper at 90 degrees step through the grits to get a mirror finish on your scraper edges. This removes the rough surface left by file.
Now the scraper is approaching as square and polished as possible.
Step 5: Compress the scraper.
Chuck the scraper into the vise and oil both the scraper and the burnisher. Holding the burnisher to the scraper use moderate pressure to compress the edge.
Step 6: Draw the edge
Just like Step 1. This will draw the hook in preparation for turning it.
Step 7: Turn Hook
Chuck that scraper back into the vise. Now hold the burnisher at about 5 degrees down off normal. Use light to moderate pressure. Our Crown burnisher is round and requires more pressure than the Veritas Tri-Burnisher’s teardrop shape.
Video: Burnishing motion.
Using the scraper
The most amazing thing for me is how light the downward pressure is when using a well sharpened scraper. When I used the file method only: You have to put quite a bit of sweat into using the scraper. This scraper brings effortless curls.
Next time: Tuning a smooth plane.
-- -John "Do I have to keep typing a smiley? Just assume it's a joke." www.flickr.com/photos/gizmodyne