Bowl Scrapers
#29
(01-26-2023, 12:56 PM)briman87 Wrote: He is still active on the AAW forum

Yeah, I saw a few recent posts of his over there.

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#30
(01-24-2023, 07:44 AM)shoottmx Wrote:  They are nice and thick--a little over 3/8" --so chattering isn't much of an issue.


Gary

That's what interest me in getting it. 1 & 1/2" wide x 3/8" thick.
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#31
Other than more thickness to absorb vibration along the shaft, I don't see what the advantage of the step down design would be.

I use sheer scrapers and negative rake scrapers extensively on bowls. When properly sharpened a negative rake scraper leaves a great finish and eliminates the oopsies I have had using a flat-top scaper tilted down near the bottom of the bowl where different portions of the arc present slightly different angles. I find a negative rake scraper held flat on the rest more controllable. I like the D-way tools ones a lot if buying new.
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''I think we may yet be able to do so,'' Bohr replied. ''But in the process we may have to learn what the word 'understanding' really means.''
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#32
I used exclusively scrapers for many years. I had everything from a 1/4 inch to 1 1/4 inches. Some scrapers I bought; others if refashioned from skews, some I made from everything from files to other pieces of metal I had. I have ground the tips to just about every shape conceivable.

Lonnie
The only tool I have is a lathe.  Everything else is an accessory.
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#33
(01-25-2023, 12:06 AM)iclark Wrote: Surprisingly hard to find good images. It also turns out that there are at least 2 different interpretations.

In both cases, the top surface of the scraper is not flat all the way to the tip.

Instead, the last of the top surface is either:
- ground at a shallow angle at the edge to form a chamfer and a negative rake scraper. or
- ground with a step-down.

The step-down is the one that Myron Curtis invented.

For scale, that is the end of a 1/4" square tool steel rod.

The negative-rake version is what they taught in our Turning 101 class.
The Glenn Lucas signature scraper is a negative rake scraper.
Here is a link to a pinterest video of making one.

Edited to correct: the Glenn Lucas negative rake scraper is made by Hamlet in Sheffield and not by Crown. Sorry.

What does a drop down scrapper do different then a top scrapper?  They both work with a burr but the drop down has less metal so I do not see that it is better so I would like to know.
It is always the right time, to do the right thing.

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#34
(01-31-2023, 01:57 PM)Arlin Eastman Wrote: What does a drop down scrapper do different then a top scrapper?  They both work with a burr but the drop down has less metal so I do not see that it is better so I would like to know.

Some descriptions say that the drop down moves the edge closer to the plane of the tool rest. That is said to give more control.

When cutting circles for trivets, the shorter height at the tip is helpful for cleanly cutting the smaller circles.

It is also possible to sharpen it so that you can do planing cuts with them.

There is some discussion of them in the AAW article on Myron Curtis, but I could not find a way to copy those passages. Sadly, Myron passed before I had a chance to take a lesson from him.

I have not had any time at the lathe to try things out since I realized the difference between negative-rake and drop-nose.
"the most important safety feature on any tool is the one between your ears." - Ken Vick

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#35
Thanks for the info Ivan
It is always the right time, to do the right thing.

Hi, I'm Arlin's proud wife! His brain trma & meds-give memory probs and has pain from injuries, but all is well materially & financially.  
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#36
One thing to note about the linked video from Robo Hippy. He's mostly cutting green wood, so he can afford to be more aggressive with his scraper compared to seasoned bowl blanks. Robo Hippy is a huge advocate of scrapers, practically doing an entire bowl from start to finish with scrapers. I remember some healthy debates on this forum between those who disagreed with Robo's methods. If you use your tools properly and safely, it doesn't much matter what method you use.
Still Learning,

Allan Hill
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