Doug Berch

Dulcimer Maker And Musician

cropped Dulcimer Builders and Makers 1 23

Preparing a Scraper

I have read that scrapers may be one of the earliest tools used by early humans. Though scrapers are very simple tools they are still in use today.

The basic cabinet scraper is a rectangle of steel hard enough to hold an edge but soft enough to be easily sharpened. Most scrapers are made of the same steel used to make handsaws.

I always have a scraper or two on the bench. I use them constantly for trimming, fitting, cleaning and smoothing just about every part of an instrument.

Though simple in concept many people including myself have found getting the hang of using a scraper to be elusive at first.

The trick is in learning to prepare the edge of the scraper.

The following illustrations demonstrate the basic principals. of preparing a scraper. I found these in an old woodworking manual somewhere. Each craftsperson eventually finds their own preferred way to accomplish preparing a scraper (an everything else for that matter!)

The tools needed are a scraper (surprise!) a mill file, and sharpening medium or fine sharpening stone and a burnisher.

burnisherBurnishers are available from most woodworking tool shops. They are usually just  a polished hard steel rod mounted in a handle.

 

A vise can be helpful when preparing a scraper, especially when filing the edge.

 

drawfilescraper

 

First the edge is trued with a file. The goal is to get the edge straight and square. This is best done using a smooth mill file with the scraper in a vise.

 

 

 

stoningscraper

Next comes the process of stoning the edge. The edge is brought to a fine finish on a sharpening stone. I often use a block of wood to help me keep the edge true to the stone. For very fine scraping this is all the preparation needed. For general scraping a bur is next turned on the edge of the scraper

 

burnishingscraper

 

After stoning the edge the scraper is laid flat near the edge of the bench and the burnisher is pressed and slid against the flat surfaces with pressure to encourage the formation of a bur along the edge.

 

 

burronscraper

The final step is to turn the bur into a slight hook along the edge of the scraper.  The burnisher is pressed and drawn along the edge while tilted at a slight angle to form the bur. As a general rule the greater the angle the coarser the cut of the scraper.

 

 

 

It takes some experimentation and practice to get the hang of this. Writing about how to prepare a scraper is like trying to describe how to tie one’s shoes; it sounds more complicated than it really is. I can usually show someone how to get a good edge and bur on a scraper in a few minutes in person.

Please feel free to ask questions!

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2 Comments

  1. Doug Berch

    Hi Parker,
    This would be much easier to demonstrate than it is to describe with words! I lay the burnisher on the flat side of the scraper and apply pressure and stroke lengthwise, not into the edge. When learned this step I was told it creates a small burr that is then turned over when turning the burr.
    I don’t think you are making a mistake by not using this step; some people do it and some don’t. I do find that adding this step makes it easier for me to turn the final burr with less pressure and I more likely not to tear or break the burr when turning it.
    The same applies to honing the edge on a stone – I can turn a burr without this step but I think I get a stronger burr that stays sharp longer if I hone it first. It also seems to give me a finer surface on the wood with less scratches from micro-chips on the burr.
    When i just need to scrape and am not concerned about final finish I simply file the edge and turn a burr. It is fast, easy and works!
    One last thing; it is helpful to lubricate the edge or burnisher so it glides over the burr during forming and gives a smoother burr. I use the age old magic substance for this – nose grease! Really!

  2. Parker Buckley

    Hi Doug,

    Can you please say a little more about the step where you lay the scraper on the edge of the bench and “the burnisher is pressed and slid against the flat surfaces?” I’ve been going from filing to turning the burr (what I recall from shop class many, many years ago), getting good results in spite of my errors I guess. When you’re forming the burr this way, are you running the burnisher lengthwise, or moving into the scraper from the edge? The arrow makes it look like you’re just going back and forth, parallel to the edge. I really appreciate your tips!

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Doug Berch & Dulcimer Makers