A common mistake

[TobyCWoods]

I hear and see this alot in the 3D printing world... particularly regarding specs for the Z axis on the MBI Rep Bots.

The spec is NOT 1 micron! It's .1mm which is 100 microns!

To print at 1 micron resolution would be .01mm on the Z axis.

Last place I saw this was from the geek on the left...

http://www.tested.com/tech/3d-printing/454430-introduction-3d-printers-promise-and-pitfalls-desktop-manufacturing/

Too many talking heads saying incorrect things. He says a number of other things that are also incorrect even though he does seem to be a 3D printer nerd.

It's kinda like the word... "decimated"... too many in the press use it to mean extreme damage to... but it actually means a decrement of 10%.

[Eighty]

Not to be a nit-picker or anything, but you're off a decimal place.  1 micron is 0.001mm.

[TobyCWoods]

oops.. hate it when that happens.

[MacGyver]

No worries it's A common mistake.

[lassikin]

well, while those guys have some entertaining vids they're not really the guys to go for specs. boiling water to 200 degrees celcius and all.

there's actually very few quality 3d printing vids on youtube which is disappointing. just a ton of timelapse print vids and a ton of quick look type of vids(advertisements rather). 

very few good looks on them. eevblog has a teardown of replicator, that's a good one. just wish there were more vids about 3d printer mods and different approaches that had quality.

-lassi

[RocketSled]

Oops.

On Thursday, March 28, 2013 1:39:09 PM UTC-4, TobyCWoods wrote:

It's kinda like the word... "decimated"... too many in the press use it to mean extreme damage to... but it actually means a decrement of 10%.

 decimate (dès´e-mât´) verb, transitive

decimated, decimating, decimates

1. To destroy or kill a large part of (a group).

2. Usage Problem. a. To inflict great destruction or damage on: The fawns decimated my sister's rose bushes. b. To reduce markedly in amount: a profligate heir who decimated his trust fund.

3. To select by lot and kill one in every ten of.

 [Latin decimâre, decimât-, to punish every tenth person, from decimus, tenth, from decem, ten.]

- dec´ima´tion noun

 Usage Note: Decimate originally referred to the killing of every tenth person, a punishment used in the Roman army for mutinous legions. Today this meaning is commonly extended to include the killing of any large proportion of a group. Sixty-six percent of the Usage Panel accepts this extension in the sentence The Jewish population of Germany was decimated by the war, even though it is common knowledge that the number of Jews killed was much greater than a tenth of the original population. However, when the meaning is further extended to include large-scale destruction other than killing, as in The supply of fresh produce was decimated by the accident at Chernobyl, the usage is accepted by only 26 percent of the Panel.

 Word History: Decimate comes from the Latin word decimâre, which meant "to punish every tenth man chosen by lot, as in a mutinous military unit," decimâre being derived from decimus, "tenth." Our word decimate is first recorded in this sense in 1600 in A Treatise of Ireland, written by John Dymmok: "All . . . were by a martiall courte condemned to dye, which sentence was yet mittigated by the Lord Lieutenants mercy by which they were onely decimated by lott." Decimate then passed beyond the military context and came to be used rhetorically or loosely with reference to more than a tenth. Charlotte Brontë, for example, stated in a letter of 1848 that "Typhus fever decimated the school periodically," although typhus fever certainly did not always kill exactly a tenth of the school's population.

The American Heritage® Dictionary of the English Language, Third Edition copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from INSO Corporation. All rights reserved.

[big_red_frog]

One of my favorite, and yet so oft abused words. 

[JohnD]

May want to go look up "decimate" as well - it's gonna be one of those nights. 

[andrewupandabout]

@lassikin

Let me know if my videos have any value as they're not just time lapse videos: https://www.youtube.com/user/andrewupandabout/videos

Any tips or ideas to increase the quality of my videos would be appreciated.

Andrew
www.3dhacker.com

[Steve]

Andrew:

I watched several of your videos while I was waiting for my Rep2 to arrive. I found them interesting and informative. Thank you for your work.

Steve

[Andrew Mazzotta]

@wingcommander

I appreciate the feedback and your interest. These are exactly the types of "tips" I need!

On Fri, Mar 29, 2013 at 2:59 PM, Wingcommander whpthomas <m...@henri.net> wrote:

Andrew, from a technical perspective, probably using a wireless lapel mic to reduce the echo in your voice recordings would help make your presentations cleaner. Only other pointer is the judicious use of closeups of whatever you are describing, which you already do. Lighting is flat, but that's getting nit-picky. Great work other than that - I have watched a few with interest.

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[Andrew Mazzotta]

@steve...thanks!

[Gian Pablo]

I think you're confusing two things: positioning accuracy vs resolution.

The Z axis can probably be addressed to a resolution of about 2.5 microns, but the resolution (layer height) is about 100 microns. Positioning accuracy is given by the number of steps the motor is capable of, divided by the pitch of the threaded rod. Resolution is constrained by the size of the nozzle and the physical characteristics of the material. (On a Makerbot, realistically, by your ability to level the platform and how much time you can afford to wait.)

It is obvious when you think about it: I use layer heights anywhere between 100 and 300 microns, and a 10 micron difference is certainly noticeable, so the Z axis can be positioned arbitrarily within that range.

[TobyCWoods]

The guy in the video may be... although if you spend the time to watch it he is talking about the Z-Axis and not accuracy on the tool path.

IMO best bet is to try to communicate direct meaning as much as possible. Anyway I'd avoid microns and stick to mm... I think in mm... although I'm in the US... DOH!

and.. I... NEVER use the word "decimate"!