Bowl Scrapers
(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.

(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.


That's what interest me in getting it. 1 & 1/2" wide x 3/8" thick.
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 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.

The only tool I have is a lathe.  Everything else is an accessory.
(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.
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(Yesterday, 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.
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