Peachey Conservation

November 28, 2017November 29, 2017

Small. Really Small. Submicron Sharpening. Polyester Leather. SuperStrop.

Some of the stropping sprays, pastes, and substrates I’ve been experimenting with.

A meter was originally intended to be one ten-millionth of the distance from the North Pole to the South Pole where it passed through Paris. The Measure of All Things is a facinating book by Ken Adler which documents this feat of triangulation — in the middle of the French revolution, no less — and also explores how the defined length of a meter has since changed. A millionth of a meter is a micron. As a point of reference, a hair on your head is about 40 microns wide. A thousandth of a micron is a nanometer. Yes, I’ve been thinking small!

Typically, I hand sharpen following a grit progression of 80, 40, 15, 5, micron on 3M microfinishng films with water as a lubricant, strop with a .5 micron Chromium Oxide (CrO2), honing compound on the flesh side of a horse butt strop, then finish stropping on naked flesh side kangaroo. Don’t get me wrong, this works quite well. And there are many other ways to sharpen a knife.

Inspired by some other sharpening approaches, two aspects of my routine seemed to need a little tweaking. First, I eliminated the large jump between 5 and .5 micron, and found some finer grits for a final stropping. Adding a 1 and .3 micron 3M PSA finishing film filled in the gap nicely during sharpening. And a final stropping with a .1 micron Poly Crystalline Diamond (PCD) diamond on polyester leather has dialed up the sharpness to eleven.

3M finishing film. The lime green is one micron, and the very bluish looking (in this image) white is .3 micron. The delrin plate is in the back.

PCD or Cubic Boron Nitride (CBN) compounds smaller than .25 micron don’t work well on real leather for two reasons: the expensive spray soaks into the leather and disappears alarmingly fast, and the natural abrasiveness of the leather itself is sometimes coarser than the spray.

One solution is to use a polyester leather, which is similar to “nanocloth”, a term Ken Swartz has coined and a great product he sells. Polyester leather is made from an ultra micro fiber that holds sub-micron sprays incredibly well, is very thin so the cutting edge does not become rounded, and is extraordinarily durable. Human hair is roughly 20 denier, but this ultra micro fiber is .04 denier. Denier is the mass in grams of 9000 meters of a given fiber. It is difficult to imagine how small and light this fiber is: 9 kilometers (over 5.5 miles) of it only weights .04 grams! All of these tiny little fibers hold the diamond particles loosely while allowing them to move around a bit, exposing new sharp edges. I think this is why they last so long.

In other words, this polyester leather is a perfect substrate for .25 micron and smaller sized sprays. I’ve experimented with the .25 micron (~64,000 grit, 250 nanometer), .1 micron ( ~160,000 grit, 100 nanometer), and .025 micron ( ~640,000 grit, 25 nanometer). These are available in PCD and CBN. The diamond seems to stay sharp longer (because of the shape and hardness?), cuts a bit faster, though is more expensive. The .25 micron is pretty close to the .5 micron CrO2 I usually use, and though it does cut quicker and lasts longer, it seems an unnecessary expense. Waxy pastes don’t apply or stick well to polyester leather.

In terms of initial cutting performance and cutting edge longevity, I can’t really tell much, if any, difference between blades stropped with the .1 micron or .025 micron. Even so, the idea of a one fortieth of a micron edge does have an almost irrational appeal, but is it just a placebo effect? Also theoretically, the smaller the grit progression in your sharpening sequence, the finer the cutting edge, and the faster you get there. But everyone has to decide for themselves if the trade off in time spent sharpening is worth the final result.

Diamond compounds are expensive, but once they are loaded onto the polyester leather they last for a long time. In my experiments, I’ve used a single polyester leather strop loaded with .1 micron for over 100 knives without recharging, and it isn’t dead yet.

I’m a convert to this new sequence. It really doesn’t take much additional time, and the resulting edge is better. All the knives I make now follow a 80, 40, 15, 5, 1, .3 micron sharpening sequence, and a .1 micron stropping. When I am paring leather for my own projects, I do a two stage stropping sequence to keep the knife sharp. First, a .5 micron CrO2 on horse butt followed by .1 micron PCD on polyester leather. Once the edge becomes too obtuse, then it is time to resharpen.

Choose your poison and treat yourself to a sharpest knife you’ve ever experienced for this Christmas!

SUPERSTROP

The Superstrop has a half inch thick cast acrylic core, which is the flattest plastic available, as well as being very dimensionally stable. Flesh side horse butt is mounted on one side and flesh side polyester ultra-microfiber leather on the other. The strop has a nice heft, about 14 ounces, so it doesn’t move around on the bench while stropping. The polyester leather comes loaded with .1 micron Poly Crystalline Diamond (PCD) compound, which should last a very long time. Sub-micron diamond replacement sprays are readily available. Replacement PSA horse butt and PSA Polyester leather is also available. When working, I like to use the .5 micron Chromium Oxide (CrO2) honing compound on the horse butt, wipe off the knife to prevent grit contamination, then finish with the .1 micron PCD. Also available with polyester leather on both sides, loaded with .1 and .025 micron PCD.

SuperStrop. 14″ x 2.5″ x ~.625″. $85.00

Replacement ~15″ x 3″ PSA flesh side horsebutt: $35.00

Replacement ~15″ x 3″ PSA flesh side polyester leather: $35.00

3M PSA FILM, ONE AND .3 MICRON.

3M finishing films.1 micron is lime green and .3 micron is white.

Delrin plate, machined and lapped flat. Fits into my sharpening system. 12 x 2 x .5″: $50.00

1 micron and .3 micron 3M PSA finishing film, 4 sheets each. 12 x 2″: $10.00

November 21, 2017November 21, 2017

W. O. Hickok Box

How much can we tease out of this nicely made wooden box with a sliding lid? Someone once told me that with enough rigor, knowledge and time, the whole history of the world could be found in any object. Mmmmm.

The Hickok company is still in business, and has made bookbinding and paper ruling tools for over 150 years. On this box, the shipping label also keeps the lid from sliding open in transit. The addressee, “News Bookbindery” must have been associated with the Goshen News, which was the newspaper in Goshen, Indiana. The wood is Southern yellow pine and has finger joints which are machine made using circular cutting heads. The bottom has saw marks from a 12 inch diameter circular saw.

Given the size, and very sturdy packaging, my guess it that it contained fragile Hickock ruling pens. The end of the box not visible in this image has written in pencil “17 point”, which would also support the ruling pen hypothesis, and could indicate the box was also used for storage. There is a Hickok order number, which I haven’t identified yet.

1910 Gane Brothers Catalog. Specific mention of mailing a small package. Apparently this is novel at the time? Source: https://babel.hathitrust.org/cgi/pt?id=nyp.33433057476958;view=1up;seq=44

In a 1910 Hickok catalog, there is special mention that smaller packages can be sent through the mail, and this occurs on the page that lists the styles of ruling pens. The 3 cent purple Thomas Jefferson 1801-1809 stamp on the outside of the was issued in 1938. I’m a little suprised a ruling machine was still in use at this late date, even in a small midwestern town. This must have been near the end of ruling machines.

Hickok is still in Harrisburg Pa, and still has lots of spare parts for ruling machines, and they still sell bookbinding equipment, such as my favorite book press, the Hickok 001/2. I visited in 1998 and wrote a short piece, “The W.O. Hickok Mfg. Co.: 150 Years of Bookbinding Equipment” for the Guild of Book Workers Newsletter #121.

Prices of Hickock ruling pens from a 1910 Gane Bros Catalog. They cost .015 cents per point. Source: https://babel.hathitrust.org/cgi/pt?id=nyp.33433057476958;view=1up;seq=44

The history of the world in this little box? Physically, it is evidence of the timber industry and industrial manufacture, as well as transportation and storage. The label is record of printing technology and the postal system. If the box contained ruling pens, these were used to make the pages for record keeping by clerks and accountants. This spins out into record keeping, finance, written marks, memory, foundations of civilization….

November 14, 2017November 14, 2017

Samson Paper Press

The Robert C. Williams Museum of Papermaking in Atlanta has one of the largest — and oldest — papermaking presses I’ve ever seen. Look at the size of the top beam, which is about two feet square!

The entire museum is fantastic. It started at the Massachusetts Institute of Technology in 1939, consisting primarily of Dard Hunter’s papermaking books and artifacts. Then it moved to the Institute of Paper Chemistry in 1954, was added to over the years, and finally landed at Georgia Tech in 2003.

The “Samson Paper Press”, constructed in 1790, was used by Hodgkinson and Co. in Wookey Hole England until the early twentieth century, according to the label. I’m not sure if the name refers to this press in particular, or is a generic term for any massive press.

It has an iron thread which generates much more power than a wooden one, due to the reduction of friction. I’m starting to think that all images of early nineteenth century presses with a ball above the platen also have iron thread. Samson has a ratchet wheel and pawl mechanism to prevent the platen from backing off when fully tightened.

The tommy bar, or press pin, is lying on the black plinth in front of the press and is about six feet long! Not visible is the iron renforcement on the end of the bar which fits into the four holed iron ball. I imagine Samson securely attached to the ceiling or wall, and three or four men working together to fully tighten it. The daylight is roughly 3.5 feet, which would be about the height of a typical post (a stack of the newly formed sheets and felts). Possibly a century of use might account for the deterioration on the lower wooden platen, or it may have been sunk into the earth under the floor. The uprights are iron faced on the two short sides. A few decades later, by the 1830’s, most presses were made completely or iron or steel, making Samson an interesting transitional press, incorporating both wood and iron.

Around the same time, the French papermaking press depicted in Diderot’s Encyclopédie appears to have wooden threads, but a similar iron ratchet mechanism to prevent it from backing off. I have a hard time believing a small wood pawl could withstand the compression.