Archive for the ‘Technical’ Category

Ink Jet Printers: Use it or loose it!

December 17, 2007

Although ink jet printers are extremely popular for photo-quality prints, for both traditional paper media and dye sublimation applications, letting an ink jet printer sit too long, between printing sessions, can lead to ink drying on the printheads, causing clogging.

Ink formulations, especially in the dye sub sector have improved dramatically over the years, and clogging is much less an issue now, than ever before.

Some of the newer ink jet printers, such as the Epson 4800 have built-in auto-cleaning utilities, which can be set to run cleaning cycles at user-prescribed intervals, i.e., daily, weekly etc.

In my experience, it’s not necessary to run daily cleaning cycles, but if a printer has been sitting for a week or more, it’s a good idea to run a nozzle check before printing. If the nozzle check pattern shows missing segments, a head cleaning cycle or two will generally bring it back to proper functionality.

For older printer models, without an auto-clean utility, here’s a site with a head cleaning utility that gets good reviews. There are also some good tips on unclogging printers there as well.

I have no connection with the site or the product.

David “The Stunt Engraver” Lavaneri
Engraving Etc. Forum

Stunt Engraving: Screwy Louie

December 6, 2007
by David Lavaneri
Photos by Robyn Lavaneri
LouisFront.jpg

I’ve engraved many wrist watches over the years, but never
thought that by accepting this Louis Vuitton chronograph,
I’d be facing one of the more challenging of them all.

Engraving any item valued at thousands of dollars, isn’t something to treat casually,
but when it comes to engraving watches, I employ a mindset of,
“A watch, is a watch, is a watch.”

After all, the procedures for engraving watches are basically the same and after
doing enough of them, there’s little difference between engraving a Timex or a Rolex.
Generally speaking, if the expense of a watch, or any item, for that matter,
becomes too big a distraction, it’s better not to accept the work.

Why would this watch present such a challenge?

Actually, the challenge ahead didn’t point to a single stumbling block;
rather a combination of factors, beginning with the fact that
the customer was in a hurry and reluctant to part with the watch at all.

There would be no time to fashion special fixtures, consult an expert on any
aspect of the watch, or in the event of catastrophe, order another watch back.

In fact, you’ll see by the following picture, the back of
the watch itself, presented a major challenge.

Back.JPG

Not only is there very little engravable area, but the only useable space is
around the outside edge and that surface is punctuated by small screws.

Copy.jpg

As if those factors weren’t daunting enough, the amount of copy
I was being asked to engrave, presented another challenge.

Asking the customer to lower their expectations, as to
how much of their desired copy can be engraved,
is an option, although, I say, “If there’s a will, there’s a way”
and usually find a way to accomodate the customer’s choice of wording.

Sketch1.jpg

Here’s a sketch of the layout I decided upon. Certainly not fancy,
but ample enough to determine my layout.

The following photo, shows the shape of things to come and frankly, I don’t like what I see.

Shape of Things.JPG

The thickness of the watch, combined with the fact that the sides
are tapered, (not parallel), means, not only will the shape of the watch
cause it to work its way out of a traditional holding jig, but there won’t be
ample clearance between the engraving surface and the diamond graver.

This isn’t going to be the slam-dunk I was hoping for.

What I would would normally do, is remove the back of the watch,
and engrave it as a single item, but not knowing if doing so
would, in any way, void the customer’s warranty, I elected to perform
the engraving with the watch intact.

Deciding how the wording would be layed out, was much easier than
determining how the watch could be held securely in the machine.

Scene of the crime.jpg

The natural, half-round shape of my machine’s vise
looks like a natural watch jig.
There would be plenty of clearance for the cutter,
although the troubling issue of the tapered sides of
the watch remained a concern.

Nice fit.JPG

Although risky, I surmised that the same physics that would force
the watch out of the vise, could also work in my favor.

Through experience, I generally knew how much physical resistance
to expect, during the diamond-drag engraving process.
I figured if I gently forced the watch downward, with my fingers,
along with the downward pressure of the cutter,
the watch shouldn’t move, during engraving.

CleanMachine.JPG

In order not to scratch the watch, I laid a cloth over the area
in which I would lightly clamp the watch.
This was a crucial adjustment, in that, I needed snug contact,
but also needed the face of the watch to
remain flat against the bottom ledge of the vise.

Any movement, during engraving and I’m in deep…well, at this point,
I can’t afford to think along those lines.
Any loss of confidence paves the way for disaster.

Tale of The Tape.JPG

My confidence builds as the theory holds up, during a light
engraving of a segement of copy, on Scotch tape.
(shown at top of photo)

Hang On.JPG

Here we go! No turning back. The tape is removed and I’ll
literally have to hang on while the computer cuts,
irreversibly, into the back of the watch.

When the machine was finished with its pass, I removed my fingers
from the watch. Everything looked good, except…uh oh…I hadn’t
given the spindle enough downward (Z axis) depth and parts of the
name “Sheryl” hadn’t engraved! Now what?

I was pretty sure the watch hadn’t changed position, when I
removed my fingers, but had no way to be certain. I was about to take
and ultimate leap of faith. If the watch wasn’t in exactly the
same position, as during the initial pass, there would be a double-vision.

This was it! Do or die!

I added more depth to the Z-stroke and with the cutter raised, let the
machine engrave up to the point with the missing characters.

I took the machine off pause and quickly placed my fingers back on
the watch, hoping nothing had shifted its position.

When the machine returned to its home position,
I was half-afraid to look at the engraving.

Voila.JPG

Here’s a photo of the finished item. As you can see, my gamble paid
off and nobody, but the people reading this article, will ever know
there was a heart-stopping moment.

I keep saying to myself, that I should quit taking on risky jobs,
but I really do enjoy a challenge, so you can expect to see more
articles like this, in the future.

David “The Stunt Engraver” Lavaneri
Engraving Etc. Forum

Dead or Alive: Diamonds can be an Engraver’s Best Friend

December 2, 2007

You’ve heard the saying “Diamonds are a girl’s best friend.” Well, to engravers who mark trophy plates and award plaques, not to mention giftware; diamonds are just as good a friend.

In the “diamond drag” or “scratch” engraving method, as it’s sometimes called, a non-rotating industrial diamond graver is crucial to creating fine-line engraved letters and designs.

When engraving a lacquer-coated substrate, such as standard trophy plate/plaque stock, a new or sharp cutter (diamond) is paramount. If the diamond tip is dull, instead of piercing the lacquer coating and creating a smooth cut, the dull cutter can break or chip the lacquer coating around the immediate area of the character or design being engraved.

Ordinarily, the letter looks fine to the naked eye, however if the engraved image is “oxidized” (darkening of engraved image utilizing a special acidic solution) the irregularities in the image become noticeable and very unattractive. At this point, a new diamond graver becomes necessary.

Now here’s the interesting part of the story. Although the “dull” diamond is useless for engraving plates where oxidation of images is necessary, they can be very useful and even preferable to a “new” diamond in certain situations.

A couple of applications where “dull” gravers are preferable:

Engraving of Armatale (cast aluminum) or pewter items. The “new” graver has a tendancy to create a very rough “burr” while engraving, whereas the flatter point of the dull tool creates a smoother image, both to the eye and touch.

Another desirable application for the “dull” tool is in the engraving of stainless steel items. Engraving stainless with a new cutter doesn’t create a burr, in fact engraving stainless steel doesn’t create any real depth at all. The engraving of stainless seriously shortens the life span of the “new” cutter. I keep “dead” gravers around specifically for the purpose of engraving watch backs and stainless travel mugs, for example, in order to preserve the sharp tool.

Whether your diamond gravers are “Dead or Alive” they all have their place in your engraving business.

David “The Stunt Engraver” Lavaneri
Engraving Etc.