The English Woodworker

Learn Woodworking Online

  • Blog
    • Video Posts
    • Hand Tools
    • Techniques
    • Workbenches
    • All Posts
  • The Videos
    • The Nest of Tables
    • Build A Danish Stool
    • The Trestle Table
    • The Industrial Desk
    • Build A Retro Sideboard – Online Video Series
    • Build A French Workbench
    • The Raw Edge Coffee Table
    • Chair Building – The Basics.
    • Build A Hall Table
    • Get Sharp – Sharpening Edge Tools
    • The Side Table & Bridle Guides
    • How To Build A Workbench – Online Video Series
    • The Spoon Rack – Hand Tool Course
  • About Us
  • Gallery
  • LOGIN

The Scientific Maths Of Sharpening

June 22, 2018 By Richard Maguire 21 Comments

You’ll find that the cost of your sharpening stones scales with the cost of your tools.
More expensive isn’t going to mean better if your stones aren’t compatible with the type of steel you use.

If you’re using the types of tools that I recommend, things like the older Stanley’s and low cost chisels then you’ll find that the best sharpening kit is also the cheapest.
These run of the mill tools have such soft steels that the best sharpening stone is without a doubt a double sided Norton oil stone.

best sharpening stonesA Good Edge.

If you want to get a sharp working edge then just use a double sided Norton and job’s a good’un.
Don’t fret about high grits, it’ll work.

A Long Lasting Edge.

If you want to take it a step further and increase your edge life then you can make a strop. Strops are very simple to make. A bit of suede on a bit of wood and rub on some polishing compound. This Veritas one is very fine, but I find it works a treat.

strop for sharpening plane blades

It’s easy and cost effective to make your own strop & it’s the perfect bit of kit for polishing your edges, particularly for cambered plane irons.

A Fast Edge.

If you want to gain speed in the rougher sharpening area then you can replace the coarse side of that Norton stone with diamond.
Go for the coarsest diamond stone that you can get.

oil and diamond stones for sharpening

The optimum sharpening kit for your softer steels: Coarse diamond plate, fine oil stone, polishing strop. These are all I use for the majority of my sharpening needs & the sharpening routine is so fast that it encourages you to always keep your edges ready for action, as well as allowing swift changes to your bevel angles and cambers to optimise for a specific task.

Choosing Your Sharpening Stones.

The Oil Stone

Sharpening can feel like a science and it seems that when people struggle they start looking for numbers hoping that finding some secret figure will make things click.
The real secret is in letting go of all of that scientific maths.

I don’t get in to that whole grit thing when buying an oil stone.
As long as one side’s fine and the other’s coarse it’ll kind of do the job.

norton sharpening stoneOil stones are very good at clagging up and burnishing so before you know it the fine becomes super fine. I say this as a good thing.

If you’re setting up your sharpening kit from scratch and going for the fully fledged option (complete with diamond stone) then you can skip the coarse oil. In place of the double sided Norton you could just pick up a single sided fine oil stone.

The Diamond Stone.

Adding the diamond stone to this kit is all about adding speed, so the coarser the better.

If you’ve got the money, the best diamond stone you can buy is probably the extra coarse DMT lapping plate.
It’s a beast, a massive thing that can burn a primary bevel on in seconds.
I use this type of diamond stone for multiple jobs including flattening other sharpening stones, general restoration and tool maintenance so it sees plenty of use.

If the DMT is stretching the budget then you can go with a much smaller diamond stone for this job. Since we’re using it for roughing the primary bevels precision is not vital.

Maintenance For Your Sharpening Stones.

While cheap tools allow cheap sharpening stones, a simple kit also allows for a simple sharpening routine.

A quick touch up once in a while is all that’s needed to maintain your oil stone. And to be honest you can get away without this at all.
Rub it a bit on your coarse diamond plate and job’s a good’un. It’ll freshen up the cutting edge and maintain flatness of the stone but as I say, it really isn’t essential.
My methods of sharpening are very, very forgiving in this regard so I haven’t flattened mine since we filmed the Get Sharp series. And it’s had a lot of use.

A Super Sharp Edge

If you’re worried that cheap and simple are sounding like compromises then don’t be. This is the setup for getting super sharp edges that can make your hand tools a true pleasure to use.

Just remember, don’t even look at an oil stone with A2 steel. The sharpening kit described here is for your softer steels only.

For a complete guide to sharpening your edge tools, including the set up for harder steels, methods, routines, angles, cambers and all the other scientific maths have a browse of our ‘Get Sharp’ video series. 

Filed Under: Sharpening

Related Posts

hand plane iron cambers
Iron Cambers – Optimising Your Hand Planes
Sharpening Narrow Chisels (the Problem & Solution)
old wooden hand plane
Dear Tool Manufacturer…


Latest News

Now Running!
Our current build is well under way. Don’t miss the live run discount WATCH THE INTRO
Woodworking project videos

About Richard Maguire

As a professional hand tool woodworker, Richard found hand tools to be the far more efficient solution for a one man workshop.
Richard runs 'The English Woodworker' as an online resource and video education for those looking for a fuss free approach to building fine furniture by hand.
Learn More About Richard & The English Woodworker.

« Rough Tools. Fine Furniture.
How To Build A Chair – Video »

Comments

  1. James says

    June 22, 2018 at 5:43 pm

    After watching the get sharp series I brought myself the kit reccomend here together with a cheap as chips second hand Stanley no 5. I was convinced that this old plane that cost me next to nothing would not perform as in Richards videos. I was so wrong. I could not believe the full length shavings that were flying off this peice of wood I had clamped to my picnic bench (great temporary outdoor workbench)I was like a man possessed desperately trying to bury myself in wood shavings. I’m happy to have both saved here on tool cost and got an older tool to work well. The noise of this plane is Seriously bloody satisfying.

    Reply
  2. Polly Becton says

    June 22, 2018 at 6:24 pm

    I’ve got a mix of OEM Stanley and Record blades, O-1 blades, and a couple of A-2 blades. I’ve got some moderately older Sorby bench and paring chisels and several O-1 chisels. Your system obviously wouldn’t cover all my edges, but I have good results in short order at very modest price with a medium and an ultrafine Spyderco stones.

    For rough work on chipped edges, I have a coarse diamond stone, or if there’s a lot to grind away, I use 80 grit paper on a granite plate; the 80 grit is faster than the diamond. My DMT diamond stone is not as coarse as your flattening stone, so that might do as well or better than the 80 grit paper.

    The ultrafine Spyderco does so well that honing on a strop does not produce any detectable gain.

    Reply
  3. Mario Fusaro says

    June 22, 2018 at 6:49 pm

    Great post, Richard. I think the new people will have an easy time at the sharpening station after reading this post and watching your sharpening video. I myself use diamond plates (300, 600 & 1200) then always finish with a homemade strop. I’ve been doing it this way for years and for me, it’s the easiest. I like my chisels to be as sharp as scalpels and it only takes but a few minutes to true up a chisel. I take a bit longer on irons as my plates are not the large width. The irons I only make razor sharp and you could shave with them if you were so inclined. New chisels and irons take me about 15 to 20 minutes to get them to the way I want them. Most important, like you, I do not worry about the math, I sharpen the wedge angle and back to work. Note: I do not use micro bevels, never did and never will.
    Cheers!

    Reply
  4. Joseph Leonetti says

    June 22, 2018 at 7:02 pm

    I bought 4 Lie Nielsen chisels and 4 Ashley-Isle chisels (same sizes for both). I use diamond stones to sharpen (coarse, fine, super fine). The Ashley-Isles sharpen well. The Lie-Nielsen chisels are a royal pain to sharpen to the point I’ve considered selling them (after all, how many chisels does one man need). Any advice on what I can do to make things easier for the Lie-Nielsen chisel sharpening? Many thanks.

    Reply
    • Richard Maguire says

      June 23, 2018 at 11:04 am

      Hi Joseph, your issue is you’re able to compare both steels side by side. Your best bet is diamond stone for hand sharpening A2, at least for the coarse stuff, and then start arsing about with the water stones. Or you could get a water stone grinder for the bulk and then fine polish on a water stone.
      Truthfully though I do believe (without meaning any offence to any business) that A2 and a chisel is a stupid idea. They’re just so think mixed with the hardness, if it was me I wouldn’t splash out, I’d sell them.

      Reply
      • Joe says

        June 24, 2018 at 7:24 am

        Thanks Richard. I will likely sell them. Too much of a pain to sharpen. As such, I’m less inclined to sharpen which is the exact opposite of what I should be doing anyway.

        Reply
        • Miikka says

          June 25, 2018 at 6:05 pm

          I have and use a fine Arkansas oil stone by RH Preyda, (sold by Classic Hand Tools in the UK). I use it in conjunction with a coarse diamond stone in the same system Richard shows in his Get Sharp -series. I have read reviews where it has been mentioned that Arkansas stones work well with A2. You would only have to invest in one fine stone if you have no issues with coarsing the primary bevel on your diamond stone.

          Nota bene, my tools are all high carbon steel so I have no personal experience with sharpening A2 on an Arkansas stone.

          Reply
  5. Joseph Leonetti says

    June 22, 2018 at 7:05 pm

    I reread your post, your video series talks about harder steels. I’m set, please disregard my prior email.

    Reply
  6. Jim Fellows says

    June 22, 2018 at 8:57 pm

    The “get sharp” series does a great job on sharpening systems for A2 steel as well, and answered all of my questions on sharpening, in conjunction with the free youTube videos. It has many time-saving suggestions, ways of simplifying, and explanations of mysterious things, that I felt tremendously confident since watching it and was able to figure out and solve problems on all of my planes. No more mysteries, no more obstacles. On to challenges in design and materials rather than tool maintance which now seems easy and completely understandable.

    I notice Dia has two large diamond lapping plates these days: one is 120 grit, the other 160 grit. So I’m heading for the 120 grit unless soneone has a better grit to recomnend. I haven’t checked all the US vendors yet, but “sharpening supplies” had a lower price than others I’ve seen.

    Reply
    • Richard Maguire says

      June 23, 2018 at 11:07 am

      Thanks Jim, it’s great to hear that sharpening has become easy – the way it should be. With regards to the diamond plate, for its purpose I would go for the coarsest, so that 120 grit.
      Cheers.

      Reply
  7. Andrew Drapper says

    June 22, 2018 at 9:20 pm

    Hi,

    I use VERY cheap diamond stones. you know, the ones with the diamond-shaped holes in them and coloured plastic backing plates. I have removed them from the plastic plates, glued them to some ply, put a strip of wood on the bottom of the ply to hook on the edge of the workbench.

    With cheap spray oil, I work through the four plates and then strop. I can shave hairs off my arm and get wood glassy smooth.

    The only job these will not do is small chisels. the wholes are too big and the blade will not run smoothly over the surface. I use my expensive diamond stone for these.

    Doing this, most of my work is on the cheap stones, though they have lasted many years and still sharpen well.

    Reply
    • Richard Maguire says

      June 23, 2018 at 11:08 am

      Thanks Andrew, it just shows you don’t need to spend.

      Reply
  8. Michael Ballinger says

    June 23, 2018 at 1:04 pm

    I have DMT stones and a homemade strop, wish my course stone was even more aggressive for when I have a nick from dropping an edge tool (doesn’t happen too often now I have a tool well in my bench). Eze-lap are a little more cost effective I believe but I didn’t know about them when I got my stones. Nothing like having a simple set up so you can get on with the task at hand!

    Reply
  9. Mike Wodkowski says

    June 23, 2018 at 5:18 pm

    How well do you feel this system works with Chrome Vanadium jobs like the affordable narex chisels?

    Reply
    • Darryl says

      June 23, 2018 at 6:51 pm

      Mike,

      I recently picked up a few of the ugly looking 8105 Narex chisels and have had no problem using an extra course Atoma diamond plate and single sided fine norton oil stone. I am still getting used to Richard’s method but even so I have been impressed with method and the Narex chisels.

      Reply
  10. Andrew Drapper says

    June 23, 2018 at 7:09 pm

    Another tip. Keep an eye out at car boots and the like. I picked up a very fine charnel forest stone for next to nothing. And even a new dragons tongue slate stone can be fantastic for when you want an even finer finish. I have used both on my straight razor

    Reply
  11. Joe says

    July 29, 2018 at 1:49 pm

    Any thoughts on water stones?

    I have a Japanese combination water stone for my kitchen knives. It works fine but I find it a bit fragile.

    In time should I swap to an oil stone if I’m going to do lots of woodwork?

    Reply
    • Byron Servies says

      July 30, 2018 at 1:32 am

      I really recommend buying the Get Sharp series if it is at all possible for you. It has helped me considerably. I would not have thought I would watch hours of sharpening tutorials. Now, I have seen them several times. They are very engaging.

      In the series, Richard covers an oil stone process with softer steel tools, and a waterstone / grinding process with harder steels with plenty of why and how demonstration. It is not really about the type of stone, but the appropriate tool setup and sharpening process for the type of steel you are using.

      I, too, was coming from water stones and guides, but I didn’t have the knowledge to use them correctly. Using the diamond + oil stone method, my soft steel chisels have gone from being shiny but compressing fibers until they shear off, to actually cutting. The difference is considerable.

      I am also confident that when I need to use my water stones for my harder steel plane blades (just a couple, happily), I will be able to do it properly.

      Reply
  12. Cliff says

    December 5, 2018 at 2:25 pm

    Does anyone know if this stone from Amazon is the one shown in this article?

    https://www.amazon.com/Norton-614636855653-8-Inch-Combination-Oilstone/dp/B07HLQJVRR/

    Thanks!

    Reply
  13. Byron says

    December 5, 2018 at 4:49 pm

    That is the stone I purchased. It works very well.

    Reply
  14. Antonio says

    September 21, 2019 at 12:14 am

    Hi Richard!

    I have a few tools with A2 steel, and recentlly I begin to shapen It with an Soft Arkansas and hard black. Did you have already test the Arkansas Stones on your modern Irons. I have the Get Sharp series and I know that you talk about oilstones on A2 Irons. For a while I’m getting good results with them. Please, ler me know If you had any experience with Arkansas. And sorry about my english… I’m talking tô you from Brazil. Thanks a Lot. I love the way you teach

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Subscribe to future posts:

 

Subscribe to future posts:

  • Blog
  • The Videos
  • Sign Up!
  • Contact Us
  • Keep Up To Date
  • LOGIN
  • Privacy Policy
  • Terms & Conditions
  • Facebook
  • Instagram
  • RSS
  • YouTube

Related Posts

How To Sharpen Thick O1 Irons On Oil Stones

The Novelty Of Hand Cranked Grinders

Iron Cambers – Optimising Your Hand Planes

See All Posts: Sharpening


  • Blog
  • The Videos
  • Sign Up!
  • Contact Us
  • Keep Up To Date
  • LOGIN
  • Privacy Policy
  • Terms & Conditions

Copyright © 2022 · The English Woodworker

Scroll Up