Trotec Speedy 100R

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Introduction

This page will document the Trotec Speedy 100R that TECFA (me) that we just acquired - Daniel K. Schneider (talk) oct 2016

As far as I can tell for now, we will use this machine to create three types of objects:

  • 2D objects, e.g. badges, games and toys (created from simple SVG drawings)
  • 3D structures to assemble from 2D elements (created from simple SVG drawings), e.g. animals
  • 3D structures glued together (made from sliced 3D objects). The slicing can be done with various tools, e.g. Netfabb, Slice3R, 123D Make.

All cut parts also can be engraved, either vector engraving or raster engraving (typically from pictures).

Specifications of the 100R at TECFA

Speedy100-atmos-compact.jpg

This system easily fits into an office and it just needs two electrical standard plugs.

Speedy 100R

  • 50 W CO2 laser (Iradion tube)
  • 610 x 305 working surface
  • 180 cm/sec speed
  • Box size: 982 x 780 x 457 mm
  • 80 kg
  • Air cooling

ATMOS Compact exhaust fan

  • 815 x 675 x 555 mm
  • 88kg

Official home page:

Laser cutting parameters

There are several parameters that must be set (you can create profiles for that)

Basic

  • Cutting power, typically 100
  • Cutting speed, typically 1
  • Cutting pulse (faster = strong, but more inflammable), typically 1000
  • Engraving power, typically 50
  • Engraving speed, typically 100
  • Material thickness, typically 2-5mm

Advanced

  • "Print file creation" parameters
  • Repetition for both cutting and engraving. Some materials need 2-3 passes.

Outline of the workflow

Preparation steps

(0) Clean the lens (with a microfiber cloth ?)

(1) Switch the machine on

(2) Place work piece

  • open cover
  • Place piece into upper left-hand corner, against horizontal and vertical rules

(3a) Focus laser beam (manually)

  • By default (for the mid-resolving lens) the beam is located 5.08 cm (2.0 in) below the lens.
  • Position the processing head over the work piece
  • Hang the focus tool on the external ring of the working head
  • Then, move up (by little steps) the working table

(3b) Alternatively, focus laser beam with software

  • Click the icon “focus laser” in the Trotec JobControl (make sure that material thickness, table height and lens type are OK !)

Create a graphic

  • Any vector graphic will do, since jobcontrol will work from the print file, i.e. the control software will analyse the postscript and let you configure the print from there.
  • However, we noticed that something doesn't work properly with Inkscape drawings (old 0.4x version), i.e. TroTec Job control cannot identify some vectors. Try producing a PDF first ("print to PDF file" in Inkscape), then print the file from PDF. Anyhow, make sure to install the latest version of Inkscape and read Using Inkscape for laser cutting

Preparing the print file

From your drawing or rendering software, File->Print the drawing

  • Select as printer Trotec Engraver
  • Click on Preferences
  • Define (at least):
    • Material parameters, e.g. a setting you defined for a given type and thickness of Material (these parameters, however can be changed later)
    • Algorithm (e.g. for simple vector-based cutting and engraving use color, if there are pictures, you could try Optimization, Stucki, etc.)

Then click bottom "print" icon and "print" again from the Windows software. Trotec JobControl now will open and the print file should appear in the jobs queue to the right.

Job Control software

In the Job Control software, verify or specify all the parameters

  • Establish Connection in JobControl
    • On the laser move the cutting head to the position where you plan to start
    • Position the job on the plate with a double click
  • Verify engraving material
  • Associated Power, velocity and Pulse parameters
  • Thickness (important in case you do more than one passage)
  • Color codes for engraving and cutting (check the panel to the left). Click update. If you see a warning about unidentified vectors, go back to you drawing tool and make sure that each object does have a good color (e.g. black for engraving). Inherited colors, in Inkscape for example, do not seem to work. Ungroup everything, select stuff to engrave and make sure that it has either stroke, fill or both.
  • <Double click> on the workspace to bring up the Material library where you can change all parameters.

You also can change

  • orientation of the work piece (right-click on the object)
  • orientation of the plate

Once the situation feels allright, click the Print button (lower right)

Print

  • Establish Connection in JobControl
  • Verify Exhaust Ready in Engraver Control (green arrow) in the Control of the JobControl
  • Press START button (green arrow) in Job Control.

Preparation of drawing

Principles:

Input

  • Any 2D CAD or drawing file.
  • For cutting, the stroke of the vectors should be less than than 0.01mm (or 0.25pt), i.e. hairline of a same color. At TECFA, we use red for cutting.
  • Other elements will be engraved, depending on the settings
  • If you use the standard "Color mode" to identify objects, pick the colors from the limited set of the basic RGB colors.

Colorcode at TECFA:

  • red = cutting
  • black = engraving (simple or double, depending on the profile)
  • blue = simple engraving

Parametrization

  • Engraving depth is varied through the laser power or the speed (energy per area unit principle)
  • For cutting, Hz settings (pulses per second) should be set to low, in particular if materials are flammable.
  • Vector lines are color coded and for each color one can assign a cutting/engraving parameter. I.e. one could use "red" for cutting" and "greys" for engraving. A print job can include cutting, or engraving, or both.

Read more in:

To learn which parameters are needed, look at published examples, for example:

Software

We suggest creating all models in SVG. That way they can be displayed directly on the web. Most drawing programs can import/export SVG

(section to be moved some day)

Online tools


Tables for cutting and engraving

Since we just started with laser cutting, please consider the following very provisional !

Material Cutting power Cutting speed Cutting Hz N cutting passes Engraving power Engraving speed Engraving resolution
MDF 5mm 55 1.2 1000 3 50 100 500

Materials

A small CO2 laser cutter can cut or engrave a wide variety of materials, e.g. (some) plastics, wood, cardstock, textiles, cork, Delrin, Depron foam.

Never cut anything that includes chlorine. Its gas can badly damage your lungs and the machine. Without ventilation it even could kill. Other materials like ABS or HDPE can catch fire and/or melt.

Read more:

Acrylic (plexi)

Acrylic, better known as Plexiglas and also known as Plexi, or Perspex is probably the easiest material for cutting. There are two different types of Plexiglas – cast and extruded. Cast acrylic seems to work better.

  • Chemical name: PMMA, (in french): polyméthacrylate de méthyle

Cast acrylic (Plexiglas GS)

  • Presents a nicer surface
  • Cutting is more precise
  • becomes white or mat after engraving, i.e. you get a better contrast

Extruded acrylic (Plexiglas XT)

  • is cheaper
  • remains clear
  • doesn't cut as nicely.

In other words, extruded Plexiglas is cheaper but results (both for cutting and engraving) are not great.

Cardstock and paper

Both cut well.

  • Cardstock is "thick paper", e.g. like birthday greeting cards.

Some cardboard (the corrugated one?) on the other hand, can catch fire.

Engineered composite wood

Various variants of "engineered woods" are popular materials in education, since it they cheap and stable. However, they contains glue and other ingredients and may not cut as nicely as solid (non resinous) wood.

MDF (Medium density fiberboard)

According to Wikipedia (10/2016), “edium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibres, often in a defibrator, combining it with wax and a resin binder, and forming panels by applying high temperature and pressure. MDF is generally denser than plywood.”

There exist variants. Again, according to Wikipedia, MDF is typically made up of 82% wood fibre, 9% urea-formaldehyde resin glue, 8% water and 1% paraffin wax and the density is typically between 500 kg/m3 and 1,000 kg/m3.

High-density fiberboard

High-density fiberboard (HDF), also called "hardboard" is, according to Wikipedia (10/2016) similar to particle board and medium-density fiberboard, but is denser and much stronger and harder because it is made out of exploded wood fibers that have been highly compressed. Consequently, the density of hardboard is at least 500 kg/m³ and is usually about 800–1040 kg/m³. It is used in the furniture industry and construction.

HDF works well with laser cutters

Plywood

Plywood (contreplaqué in French and Sperrholz in German) includes at least three rotated layers of wood. Plywood boards are cheaper to produce than wood and keep their form. However, unlike wood, it is difficult to sand plywood to make it look again once it starts aging. According to Wikipedia (10/2016), Plywood is a sheet material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another.

There exist many different types, e.g.

  • Softwood plywood, typically used for construction
  • Hardwood plywood “is made out of wood from angiosperm trees and used for demanding end uses. Hardwood plywood is characterized by its excellent strength, stiffness and resistance to creep.” (Wikipedia)
  • Aircraft (or high-strengh) plywood is usually made from mahogany and/or birch.

For laser cutting, there are two challenges: Avoiding defects (e.g. hard nodes) in the inner layers and dealing with rather toxic glue.

Usually, more layers (multi-ply) wood means better quality. According to the nervous system blog, multiple layers may include more opportunities for "bad" spots to exist and contain more glue and therefore are not more suitable for laser cutting. As result they decided to have their own three layer version built from high quality wood.

There are companies that sell plywood designed specifically for lasering.

Polystyrene foams

Can catch fire and may be toxic. Special safety measures must be taken.

E.g. this is probably OK if you have a good ventilation system. It does not contain chlorine, see the MSDS

Cloth

Most "natural" fibers like felt, hemp or cotton cut well.

polyvinyl chloride (PVC)

  • Very dangerous.

Links

Local (Geneva area) shops

  • Migros Materials (local do-it-yourself shop)
  • Polyplast
  • Serex
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