Hand Tools

Subject:
A small experiment

Wiley Horne
Hi Steve and all on this thread,

I wanted to see exactly what a given setback looks like. Here’s what I did....I folded a piece of white note paper and mic’ed it—7.5 thousandths at double thickness. Then found a sorta fat Post-It that mic’ed at 5 thousandths.

Then got 2 planes ready, LN4 w/PMV11 and LN5.5 w/Elliott 3V. Sharpened irons to pass the newsprint test. Capirons at a rounded 50 degrees.

Set the capiron setbacks: Joined blade and cap iron with screw only finger tight. LN4 bladeset stood up on 7.5 thou folded paper; tapped the iron through the paper to the benchtop underneath, with capiron staying on top of paper, and tightened screw. So now there’s a 7.5thou setback on the LN4. It looked just like how I have been setting intuitively.

Then repeated this operation with the Post-It, to get a 5thou setback on the LN5.5. Visually, that looked like the tightest practical setback I would ever attempt in real life.

Just out of curiosity, I retrieved a partially inlaid Federal leg. When I made this table,

http://gallery.woodcentral.com/wp-content/gallery/wiley-horne/img_20150211_0011.jpg

I started with 5 leg blanks, figuring I would make my learning mistakes on the first blank, then the other 4 blanks would be for-real.

So I tried three planes out on this unfinished ‘learning’ leg. The LN4 w/7.5thou setback and 2 thou shaving; the LN5.5 w/5thou setback and 1.5thou shaving; and a Konrad Sauer 50-degree A5 (capiron retracted, tight mouth) and 1-thou shaving.

Planed the upper leg section, first photo with the grain and second photo against the grain. The grain is laying at ~14 degrees. The result:

https://www.flickr.com/photos/78661951@N07/albums/72157710675324531

Pretty uninteresting. No tearout. The various gaps revealed are either unfinished inlay or sloppy gouge work. [The inlay was done by gouge only: the pattern was dug into the leg with gouges, and the same gouges were used to cut the inlay pieces from the veneer sheets—if you do it right, you have an exact fit.]
Oh, and one other thing...the shavings at 2thou, 1.5 thou, and 1 thou, with or against the grain, all stayed curled—shaving had no diagnostic value within this range.

Conclusion: To do this in real life again with fresh inlay, I would first wait a day until the hot hide glue has fully set and the surrounding wood has dried and shrunk back to normal. Then file any protruding edges more or less flat. Then lay on shellac to glue down any loose ends. Candlewax on the plane soles, to reduce friction so I can feel the blade engage and cut.

Then plane with either LN at 1thou with 5thou setback, or with the infill. Should be no difficulty. But it all starts with having a mental image of what the setback should look like.

Wiley

Messages In This Thread

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