|Project by Luke Addington||posted 04-09-2015 03:01 PM||4067 views||33 times favorited||30 comments|
I rescued a few small pieces of ebony from becoming parts of cutting boards and decided to make them into something I will use for the rest of my life – a veneer hammer. Hammer veneering is one of the oldest and most effective methods for adhering veneer to a substrate with hot animal protein glue. The hammer works more like a squeegee than an actual hammer. Here's a good video if you’re interested in seeing the process.
This veneer hammer is made of Gaboon Ebony & African Blackwood and joined with a through wedged tenon. The handle is modeled after an antique French Scraper handle. The finish is French Polish. The brass tip has a very sharp radius perfect for applying large amounts of pressure where needed.
Thanks for taking a look!
I started out with a piece of African Blackwood that was 4” wide by 6” tall. I marked a center point on the edge and then set my compass to mark out a half circle spanning the entire width of the piece. I then marked a center line down both the length and width of the piece. At that intersection I again set my compass and drew a half circle. After that I marked two more half circles that would flow and nicely connect the half circle on the top and bottom.
Then I marked out a 1” mortise a half inch down from the central point on the front and back of the piece and chopped it out. It helps to prevent splitting by chopping out the mortise now instead of after shaping the head.
I used a frame saw with a thin blade to shape the head but a scroll saw, band saw, or even fret saw can easily do the job. I used half round rasps and files to clean up to the lines I drew out previously.
I used a 1/4” thick piece of brass I bought from a local industrial supply company – 3/4” wide by 1’ long for about $5 – for the tip. I used a hacksaw to cut it to length – 4 1/2” (you want the brass to extend past the edges of the hammer head so you can get into corners when veneering), creating a slight angle at each end. Then using a file I brought the edge to a rather sharp radius – this is the point that will make contact with the veneer.
I used a crosscut saw to cut a slot into the mouth of the hammer to receive the blank, then used a fret saw to remove the waste in between each saw kerf. Chisels and rifflers cleaned up after that.
I then sawed a tenon in the end of my piece of Gaboon Ebony (12” long, 1 1/2” thick & wide) leaving a 1/4” shoulder all the way around.
I had seen an antique French scraper handle in the book “The Art of Fine Tools” by Sandor Nagyszalanczy and wanted to copy it for this hammer. I really enjoyed the proportions and I like the idea of working with an old design. It’s a pretty simple shape to turn but feels really nice in the hand. I had to make a few modifications.
First, to account for the tenon at the top of the handle I needed something to transition in to the skinny neck to mimic the scraper. I made a simple cove that I think works well. Second, I made my handle a little thicker to account for the extreme pressure that will be focused around the neck of the handle during the process of hammer veneering.
I then made an ebony wedge from an offcut, cut a slot in the tenon, and assembled the joint with Old Brown Glue, driving the wedge home for a very tight fit. I then used rasps and files to gently slope the front of the hammer head and glued the brass in place.
A flush cut saw and card scraper made short work of the protruding tenon & wedge. I sanded everything up to 800 grit and burnished with 0000 steel wool. This is how the hammer looked after that process.
At this point the hammer was ready for finish. I decided to French Polish everything, more for fun than anything else.
Here is my French Polishing kit (in France it is called “vernis au tampon” meaning “polish with a pad”):
1. Squeeze bottle of 180 proof alcohol marked with an “A”.
2. 4h pumice. This gets put inside 2 layers of cheese cloth so it can be lightly dusted onto the workpiece.
3. Salt shaker filled with non-drying mineral oil.
4. Pore filling pad inside a large mouthed jar. I like these jars because they’re easy to get your hands in and out of. I mark the top of this jar “Ponce”.
5. Super Nikco burnishing compound from France.
6. Polishing pad inside another large mouthed jar. I mark this jar “Vernis”.
7. Freshly made dewaxed blonde shellac. Patrice Lejeune recommends a 1:4 ratio shellac to alcohol and I have found that to be perfect. I use a digital food scale set to grams to measure out my shellac and alcohol. This makes it very easy to keep everything consistent. In this bottle is 20 grams shellac and 80 grams of alcohol strained through a very fine automotive paint strainer. I mix the shellac in a separate mason jar and then strain it into this squeeze bottle marked with an “S”.
8. Kraft paper. When I’m polishing I cover my bench or table with kraft paper for a clean surface.
The first step of French Polish is called pore filling. In this photo you can see my materials gathered and ready to go to pore fill. Instead of re-writing the book on French Polish, I will link to the best video about French Polish on the internet, by Patrice Lejeune of Antique Refinishers & The American School of French Marquetry. Patrice can explain much better than I ever could.
In the next few photos I show a couple examples of pad construction. One for pore filling & one for polishing. The basics are muslin, linen, shredded cheesecloth, and wool. One thing I would like to do is find the proper shredded cheesecloth and wool that Patrice uses. But the set up I have right now works pretty well.
6”-8” squares work great.
I like to iron out the muslin and linen before using.
After pore filling I hold the hammer up to a natural light source and check the reflectivity. If you look closely you can see the head reflecting the cactus from about 7 meters away.
After pore filling a couple times with a day in between each session I waited another day and started the polish. The polishing does not take very long at all but yields an incredibly deep, reflective finish.
Thanks for Looking!
-- Luke, http://www.AddingtonFurniture.com