So I learned how to bump flake yesterday and I want to know what rake angle I should use. Currently it is a 120mm radius as recommended and a 5 deg negative rake on an Anderson scraper since is too stiff to be a scraper
I learned this from my dad when I was a teen and now make it part of my instructions during my classes. You seem to have it down pretty well, Paolo did a good job showing you as I said he was a good student. Practice makes perfect. The Anderson is not my favorite scraper as. . many know. You need to measure the depth of the flake mark. It looks like yours maybe .0005" or less. They need to be .002". That is called 1/2 moon oil flaking, meaning it is used as an extra deep oil pocket after you scraped the ways and those low scrape marks are .0002" to .001" . They are also used for cosmetics like you see on Bridgeport table tops. If you do it correctly you will break the carbide off the flimsy Anderson blade.
If I were you, buy a Sandik scraper 1" wide handle and clamp on a 1 x 1" carbide blade or make one like the one I inherited from my Dad. It's a piece of flat tool steel 1/4" thick x 1" wide x 12" long including wood handle. It looks like you have the lean backwards as you hit. The blade radius depends on how big the machine ways are. For a Bridgeport we use a 60 mm ( 2 1/2" aprx) radius with a neg. 5 degs. rake. I keep mine at 60 mm. Im not sure if Paolo uses a soft blow hammer or just his hand. I showed him both ways. I used to use my fist wrapped with a red rag, but now use a soft blow hammer as my hand got hurt hitting in a million times...lol... The secret to doing it correctly is with a hammer is to strike it straight at your belly button and on the side of the handle and a tight grip so it springs back. If you use a red rag you strike it on the up stroke as your move your hand in a circle swing. Don't press down with the hand holding the handle, just grip it tightly for the back rotation spring back. This so hard to explain when writing. lol...but a lot easier showing in person or on my DVD.
Another thing is you need to use a Sharpie to make your lines at a 45 deg. angle and not any which way as you show on the bottom of the slide.
Like I said "Practice makes perfect"
One of my best students ever has a great You Tube showing both hand and power flaking. minute 2:18 shows hand flaking with his poor hand...lol
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