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Knowledge You Can Build On — Est. 1998

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Scrapers

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Scrapers

#1

Scrapers

Duane C.Leach

>Scrapers can be very tricky to use. You get a lot of catches with them.

Some time ago I read an article about a new scraper grind, or at least it was new to me. I tryed it and liked it. It has a place in my bag of technices.

I think the easest way for me to discribe it, is to discribe how to shape and sharpen it.Start with a round nose scraper, adjust the platform on the grinder, and shape the bottom of the scraper to about 55 degrees. Re adjust the grinders platform, turn the scraper upside down, and shape the top edge of the scraper to produce a hollow ground surface about 3/16" wide. What angle to set the plat form? I Don't know. I played with the top angle untill the two ground angles formed an angle of about 90 degrees.

Testing it on spinning wood. I started with handle up Like normal scraper use. It worked. I tryed riding the bevel, bring handle up untill it starts to cut. Ribbions flowed off the wood almost like from a gouge, and no catch. It worked even better on edge as a shearing cut.

One can play with the angles to make it what you want. but it is much more user friendly.

I hope this helps some of our newer turners.

Duane Leach

Re: Scrapers

#2

Re: Scrapers

John Lucas

>Duane

I don't find scrapers hard to use at all but then I started out with them before I learned what bevel rubbing was all about on the gouges.

I just ground one of my flat scrapers to a negative rake and on initial testing it doesn't work as well for me. The Juries still out. I'm sure I will need to do a little testing. So far it doesn't seem to raise as agood a burr. I'll have to test some angles to see if I can improve on it.

Stewart batty had a negative rake round nose scraper that seemed to work miracles in his hands. I plan to build one as soon as I get time.

Re: Scrapers

#3

Re: Scrapers

jeff jilg

>How long are the scraper edges lasting for you guys on dry wood, like ash? I've tried a couple of scrapers and not had good results. Seemed like I was spending a lot of time going to the grinder.

Maybe the cheapie scraper I bought was too cheap of a steel. Are you using M2 or similar stock?

Re: Scrapers

#4

Re: Scrapers

John Lucas

>Jeff

I have 3. Two store bought and 1 homemade. None of them hold an edge long but it takes me all of 10 seconds to put a new edge on.

Re: Scrapers

#5

Re: Scrapers

jeff jilg

>Well, that's a good point John. I guess they are for finish work anyhow. And I agree the actual sharpening cycle is pretty small.

Re: Scrapers

#6

Re: Scrapers

Bruce Wiseman

>Well, I slept through most of math class but if the bottom angle is 55 degrees and the two angles meet at about a 90, wouldn't the top angle be somewhere around 35 degrees? Thanks for the info Duane, any chance you could bring it to the next club meeting to pass around?

Re: Scrapers

#7

Drop nose Scrapers

Ed in No.VA

>We call them drop nose scrapers and the turners in our club (Capitol Area Woodturners)have been using them for six months.

The idea came from England. They will slice ribbons if used agressively or very fine shavings when used with a light touch. I converted three of mine one large round one small round and a large left side grind. I have three unconverted but I seldom use them anymore.

Re: Scrapers

#8

Re: Drop nose Scrapers

shelgra

>Would appreciate a photo or diagram. Thanks in advance, Shel

Re: Scrapers

#9

Re: Drop nose Scrapers

John Lucas

>Ed

Do you know what the angles are for the drop nose and front bevel? I may get some time to work with mine on Tuesday and would like to change the grind if necessary to see if I can get it to cut better. So far it doesn't cut as good and when I left the top flat.

Re: Scrapers

#10

Re: Drop nose Scrapers

DWFII

>I'll second that!

DW

In the High Desert of Central Oregon

Re: Scrapers

#11

Re: Scrapers *LINK*

JHS

>At the link provided goto Latest Products and select Hardwood Scraper. If this what everybody is talking about, the instructions for its use and sharpening are found at the Instructions Selection on the navigation pane.


http://tinyurl.com/cngnu

Re: Scrapers

#12

Re: Scrapers

Duane C.Leach

>Sure thing Bruce. But you better remind me to bring it. Also you guys have to promise not to use it on me. I still have staples in my head from last week.

Happy turning

Duane

Re: Scrapers

#13

Re: Scrapers

Duane C.Leach

>That's it. That is where I read about it a few months ago. The instructions are great to. I had forgotten where I had seen it and read about it. Good ole Sorby.

Thanks

Duane

Re: Scrapers

#14

Re: Scrapers

GaryG in MD

>Note that in the Sorby "instructions" sheet (their sub-link), it shows the tool being honed (!) on the rake and hence, apparently, with no burr. That may be why people are having differing performance results. ...Gary

Re: Scrapers

#15

Picture please!

Jorge Castaneda ~ Downeast Maine

>Duane,

Some of us are visual persons and words do not convey pictures to our minds some times, could you post a picture of the scraper ground as you are telling us?

TIA

Jorge

Re: Scrapers

#16

Re: Scrapers

John Lucas

>They aren't using that as a scraper. They are rubbing the bevel so it's really just a high angle cutting tool. Am I wrong in that? You can do the same thing by honing the burr off the tip of your scraper and rubbing the bevel. I tried this after reading an article on the web a bunch of years ago. I didn't see any advantage(at least for me) than using another cutting tool.

The negative rake scraper looks the same but has a burr and is used with the handle higher than the cutting edge. The advantage of the negative rake on a flat scraper is simply not having to raise the handle. the negative rake takes care of the angle.

Stewart Batty's negative rake scraper looks more like a skew laying on it's side. The top has a very long bevel and the bottom is only beveled about 1/8 to 1/4". It's sharpened to a very sharp angle like a skew rather than blunt like the Sorby.

Re: Scrapers

#17

Re: Scrapers

Duane C.Leach

>http://www.robert-sorby.co.uk/ Sorry Jorge I can't post pictures yet but this link will show you all you need to know about this scraper.

I think one should play with the angles some to find what works best.

Good luck.

Duane

Re: Scrapers

#18

Re: Scrapers

Barry Irby

>I don't get this at all. Of course, i might get it if I actually tried it, but that's never stopped me from shooting from the lip before. What does the top bevel do? It changes the angle that the two bevels meet at, but what mystical thing is that good for. It thins the edge of the tool. Why is that good? How does the wood "know" That the top bevel is even there? Couldn't you just change the angle of the bottom bevel to get the same angle with the top of the tools and skip the top bevel? You'd have to adjust the height or angle of the handle, but why not?

Re: Scrapers

#19

Re: Correct on all counts, but...

RussFairfield

>The First Rule of Marketing is to convince the customer that they can't live without something that they don't need.

If everyone were to "make do" with what they already have, how would the tool companies be able to sell us more tools that we don't have.

Re: Scrapers

#20

Re: Drop nose Scrapers

Ed in No.VA

>Just measured mine. 76 on the bottom and 14 on the top. I also sometimes use the Veritas scraper burnisher to improve the burr.

Re: Scrapers

#21

Thanks Duane!

Jorge Castaneda ~ Downeast Maine

>

Re: Scrapers

#22

Re: Scrapers

Duane C.Leach

>Barry. I don't know why it works, but it does. I suppose it has to do with physics. The angle at whitch the wood is ejected. The angle of the downward force of the rotating wood. Or maybe it has to do with how you hold your mouth. It just works.

The main reason I made the original post was to try to help some of the newbies who ask questions here about why they continue to get catches with the scraper.

Duane

Re: Scrapers

#23

Re: Scrapers

vicmarc.fan

>Our turning club has tapes we can check out and I noticed all the "big boys" use scrapers to get a clean surface. I had to have a lathe like Raffan uses in his shop so I got one of his scrapers also. I have had more than one bowl come flying out of the chuck with a catch near the rim. Thinking I was presenting too much edge to the work I got a much thinner scraper which leaves ridges in the work. I now use a sandpaper scraper run with a right angle drill turning CCW and have not lost a bowl to date.

Ron

Re: Scrapers

#24

My guess . . .

Fred in NC

>Is that the angle on top of the tool substitutes for pointing the tool down, so you can hold the tool in a more natural position.

When using regular scrapers my tool rest is high, and the tool points down, handle up.

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