Como Construir Caixas Usando Sketchup

7/23/2019 Como Construir Caixas Usando Sketchup

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3D printed enclosures designed using SketchUp

The board to be enclosed. The board uses through-hole components and has 1206 resistors on the reverse s ide so room or the pins

and resistors is needed bet!een the board and the bottom o the enclosure.

"uilding an #nclosure using SketchUp and 3D $rinting$osted on %une 1& 201' b( )len

The image above shows two

enclosures for a printed circuit

board design. These were

designed using the inexpensive

hobbyist version of CadSoft

Eagle and the free maker version

of Trimble SketchUp. The free

version Netabb !asic was used

to check the design formanufacturing. The enclosures

were finally "# printed at

shapeways.com using their E$S

ormiga %&&' S(S "# printers.

)ead on to see some of the

lessons * learned while designing

and printing these enclosures.

*ind or Design a "oard

The first step is to find or design a board. The board * used is a +uad )S,- differential transmitter board. *t has

a #igilent %/$# connector for connecting to an %01 board and four T* differential transmitters chips that

connect to %hoenix Contact terminal blocks. There2s a fifth terminal block for a 345 power input and a power

supply on the board as well.

1t this point6 open up the board

file in Eagle and note some key

measurements.

The board measures &7'' by

&"4' mil. The holes are &4 mil

diameter and are inset &4 mil

from each board edge.

$hotons& #lectrons& and DirtA blog by Glen Akins

ding an Enclosure using SketchUp and 3D Printing | Photons, Electr... http://bikerglen.com/blog/building-an-enclosure-using-sketchup-and-3d-...

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The board to be enclosed as seen in the #agle $+" editor.

#,port the "oard rom #agle and mport into SketchUp

To export the board from Eagle and import the board into SketchUp re+uires the set of EagleUpplugins for Eagle

%C! and SketchUp. The EagleUp Export U(% script is used from within the Eagle %C! editor to export the board

geometry6 bill of materials6 and component placement information to a .eup file. The .eup file is then imported

into SketchUp using the EagleUp *mport plugin. $nce the plugins are installed6 the steps re+uired to perform

the export and import are as follows8

$pen the board in Eagle %C!.&.

)un the eagleUp9Export.ulp U(%. *2m only interested in the board geometry and parts so * selected the

no silk layers and no image options at export. Click $: and the .eup file will be created.

.

(aunch SketchUp and open a new file. )un the EagleUp *mport plugin from the SketchUp %lugins menu

on the .eup file created in Eagle. * could only get the EagleUp import plugin to run successfully if * set

the model units to decimal millimeters with a precision of '.''&mm.

".

Set the model units to the same units used in Eagle. * used decimal inches with a resolution of & mil

since the board design was done in mils. /easure the board to make sure it is the same dimensions as in

Eagle.

-.

1t this point6 you2ll have a "# model of your board in SketchUp but a lot of the parts may be missing depending

on the parts on your board versus the parts in your "# component library.


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The board as initiall( imported into SketchUp. lot o components are missing.

The board !ith all ke( components properl( located and si/ed.

dd issing $arts

Now to add the missing parts to the board. Search the internet for "# models of any missing components. ;ou2ll

need the components in either .skp or .stl format. Some manufacturers provide "# models directly on their

website. $thers you2ll have to find on "rd party websites. :ey components to include are things that impact the

dimensions of the enclosure such as the tallest component on either side of the board6 and connectors6 switches6

or indicators that will pierce a wall of the enclosure.

*n the case of my board6 * added the missing Samtec terminal strip and the five missing %hoenix connectors to

the board. *


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)uides indicating the edges o the $+".

=ere are the dimensions used to design the bottom of the enclosure8

Description Si/e otes

Bottom Height 0.350Somewhat arbitrary but at least sum of bottom thickness and PCB bottomclearance.

Bottom Thickness 0.00 Chosen so an !3 nut can be com"letely recessed into bottom of enclosure.

#dge Thickness 0.050 Chosen based on ca"abilities of 3$ "rinter.

PCB #dge Clearance% 0.0&5 Somewhat arbitrary but at least 0.0 05on each edge.

PCB BottomClearance%

0.0'5 (eeds to clear "ins on through)hole "arts* S!$ resistors on back of board.

PCB Thickness% 0.0+3 ,rom the board -endor.

!3 (ut $imensions%5.5mm 0./' across flats* /.&mm .015thick.

,rom the nut -endor.

Use the tape measure tool to draw some guides to indicate the outline of the %C! board. )emember that this

board is &.7''> by &."4'> with a '.&''> corner radius and four '.&4> diameter holes in the corners inset '.&4>

from each edge.

The enclosure will have '.'4'>

thick side walls '.'-4> from the

edge of the %C! board. The

outside corner radius of the

enclosure wall will be '.&4>.

The inside corner radius will be

'.'?4>. These radii will give a

wall thickness of '.'4'> in the

corners and clear the roundedcorners of the %C!. Create

guides at the outside wall edges6

the inside wall edges6 and

centers of the corner radii. The

picture below shows the upper

left corner once the guides are

created. )epeat for the

remaining corners.

#raw lines and arcs for the outside edges of the enclosure. Use the push@pull tool to pull the resultant plane

down into a '.&''> thick solid.

Now create guides6 lines6 and arcs for the features on the inside of the bottom of the case. These include the

holes for the /" bolts that will run through both the enclosure and the %C! as well as supports for the bottom of

the %C!. * made my supports '."-4> by '.""4>. These need to clear any components or pins located on the

bottom of the %C!.

Use the push@pull tool to extrude the side wall up '.4'>. Use the push@pull tool to extrude each of the %C!

supports up '.'?4>. 1fter moving the first %C! support up '.'?4>6 you can double click the remaining three

supports to extrude them up by the same amount.

Now that we know where the %C! needs to rest in the enclosure6 unhide the %C! and move the bottom face of

the %C! to rest on the top face of the %C! supports. Unhiding the %C! will also let you check clearances on the


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Upper let corner o the guides indicating the enclosure edges. ines and arcs are or illustration onl(. Dont create them (et.

bottom and sides of the board.

=ide the board and add the nut

recesses to the bottom of the

enclosure. The nuts are '.&?>

across their flats. *f we make the

nut recesses '.?'> across their

corners6 that will give the recess

a distance of '."-> across the

flats and a clearance on each side

of the nut of '.''74>. The nuts

are '.'A4> thick. 1 recess depth

of '.&''> will allow the nuts to

sit flush with the bottom of the

enclosure.

The hex extrusions should be

centered at '.'> from each

outside edge to center them on

the holes in the %C! and the

%C! supports. (astly6 delete the

circular planes at the bottom of

the hex extrusions to create the

'.&4> holes completely through

the bottom of the enclosure.

0roup the bottom of theenclosure into its own group.

This will prevent the bottom and

top of the enclosure from

merging into a single blob as we

create the top of the enclosure in

the next step. The bottom of the

enclosure is now complete

except for the connector cut

outs. Be2ll design the top of the

enclosure first then make cut

outs for the connectors at the

end of the design process.


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+reate guides then dra! lines and circles or the eatures inside the bottom o the case.

"oard properl( placed inside bottom o enclosure.

#,trusions or he, nuts on bottom o enclosure.

Design the Top o the #nclosure

=ere are the dimensions used to design the top of the enclosure8


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Duplicate the bottom o the enclosure to 0.14 belo! the top o the enclosure.

#,trude the top plane up to the desired thickness o the enclsoure top.

Description Si/e otes

To" Height 0.300 Chosen to accommodate height of all com"onents and nearest a-ailable !3 bolt length.

To" Thickness 0.00 Chosen to be same as the bottom of the enclosure.

#dge Thickness 0.050 Chosen based on ca"abilities of 3$ "rinter.

PCB To" Clearance% 0.3/

(eeds to clear all com"onents on to" of board.To" clearance is o-erall enclosure height minus thickness of to" and bottom* PCB thickness* andPCB bottom clearance%0.35020.300 0.0020.0020.0+320.0'5 4 0.3/.

-ailable !3 Bolt6engths%

/mm* 5mm less common*+mm

Threaded length e7cluding bolt head8 from bolt -endor.

#ouble click into the bottom enclosure group6 orbit to view the bottom of the enclosure6 and select the plane

forming the bottom of the enclosure. )ight clock and select the bounding edges. Copy the bottom plane and

connected edges to the clipboard then exit the group. %aste the edges '.''> above the top of the bottom of the

enclosure.

#elete the hexagonal holes and

extrude the plane up '.&''> to

form the top of the enclosure.

=ide the enclosure bottom and

orbit the camera to view the

bottom of the enclosure2s top.

1dd the outline of the inside wall

to the enclosure. This wall is

'.'4'> thick and has a corner

radius of '.'?4>.

Extrude the enclosure wall down

up in the camera viewD '.''>.

1dd the internal %C! supports.

These are '.4'> in diameter

and centered on the holes in the

%C!. #raw guides '.&?'> from

each interior edge wall to locate

the center of the %C! holes on

the lid of the enclosure. #raw acircle with a radius of '.&4 at

each of the four intersections

and extrude the circle down by

the %C! top clearance6 '."&>.

$rbit the view back to the top of

the enclosure to add the screw

head recesses to the top of the

top of the enclosure. These are

centered above the holes in the

%C!. #raw guides at '.'> from the outside edge. Center a circle '.4'> in diameter on these guides in each

corner then extrude the circle downward '.'4'>. The diameter of the head of the bolt is and

will fit inside the recess. The bolt head is slightly thicker than '.'4'> and will protrude very slightly from the top


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dd the outline o the inside !all to the bottom o the top o the enclosure.

Use the push5pull tool to e,trude the inside !all do!n 0.2004 to!ard the enclosure bottom.

#,trude the internal $+" supports do!n rom the top to!ard the $+".

of the enclosure.

1dd '.&4> diameter holes all

the way through the %C!

supports and enclosure top. This

is easier to do from the bottom.

#raw a '.&4> diameter circle in

the center of each %C! support.

Extrude the circle up to the

bottom of the recess in the top of

the enclosure to from a hole all

the way through the %C!

support and the top of enclosure.

0roup the enclosure top into its

own group so that it other

entities can be added to the

drawing without affecting the

geometry of the enclosure top.

The top is now complete except

for the enclosure cut outs which

we will add in a later step.

Unhide the bottom of the

enclosure and the %C! board.

1t this point6 verify that bolts are

available that will extend fromthe bottom of the recess in the

enclosure top to the bottom of

the enclosure. This distance is

'.''>. *t2s the height of the

enclosure '."4'> 3 '."''>D

minus the bolt head recess depth

'.'4'>D. '.''> is &4.-mm.

/"x&4mm bolts which are less

common than /"x&mm boltsD

can be used to hold the

enclosure together. *f you are

unable to obtain /"x&4mm

bolts6 ad


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dd 0.004 deep recesses or the heads o the 3 bolts.

#,trude bolt holes through the $+" supports and top o the enclosure. This is easiest to do rom the bottom o the $+" supports.

#nclosure top and bottom are complete e,cept or connector cut outs. 7eri( available bolt lengths !ill it (our enclosure.

ake +ut 8uts or +onnectors

(et2s start with the five %hoenix Contact connectors and the bottom of the enclosure. =ide the top of the


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ark the location o the cut outs or the connectors 0.0104 rom the edge o each connector.

Use the push5pull tool to lo!er the sides belo! the connectors.

enclosure but leave the enclosure bottom and %C! visible. * usually leave a clearance of '.''4> to '.'&'> around

each edge of connector depending on the precision of the printing@machining6 machine assembly vs hand

assembly6 etc. or "# printed plastic with a hand,assembled %C!6 *2m going to use a clearance of '.'&'> on each

edge to be on the safe side.

Use the measuring tape tool to put guide points on both the inside edges and outside edges of the enclosure

bottom. These guide points should be '.'&'> from the intersection of each connector with the top edge of the

enclosure bottom and along the enclosure edge. Bhen you2re done6 you2ll have ' of these guide points. Connect

each pair with lines perpendicular to the enclosure edges. )emember to make the lines inside the group with the

enclosure bottom. 1s tedious as this process is6 at least we can use the snap to intersection feature of SketchUp

versus using a calculator to calculate these points from the connector data sheet and %C! layout.

#raw a guide line on all sides

about '.'&' below the

connectors. * made my guide

line '.4> from the bottom

edge of the enclosure. Use the

push@pull tool to lower the side

walls to the guide lines

underneath each of the five

connectors.

(et2s move to the position6

'.&''> pitch6 single row header.

* want this cut out to be '.?''>

wide and centered on the

header. * also want the bottom ofthe cut out to be inline with the

bottom of the %hoenix Contact

connectors. * drew a guide up

'.4> from the bottom of the

enclosure then centered two

lines '.?''> apart on the top

edge of the enclosure bottom.

* then used the push@pull tool to

lower the side wall to the guide

line.

That completes the enclosure

bottom. Time to move to the

enclosure top. Use the unhide

command to unhide the

enclosure top. #ouble click into the enclosure top group and create guide lines at the edge of each lowered wall

on the enclosure bottom. Be2ll use these guides to transfer the dimensions and cut outs from the bottom of the

enclosure to the top of the enclosure. This is probably easiest done with the %C! hidden. Now create a guide line

'.&'> from the top of the enclosure on each side with a %hoenix Contact connector. This will be the height of

the cut outs for the %hoenix Contact connectors. $n the single row header side6 create a guide '.7' down from

the top of the enclosure.


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)uides used to lo!er the side !all around the header connector.

The guides or the cut outs in the enclosure top.

=ide the bottom of the enclosure

and orbit the camera to view the

top of the enclosure. Use the

guides to draw lines across the

enclosure edge for each cut out

then use the push@pull tool to

lower the side walls for eachconnector.

#elete the guides and unhide

the %C!. The enclosure design is

done.

Now would be a good time to use

the orbit tool to admire your

work @ check your work for

mistakes. Check clearances

around the board edges6 the top

of the board6 the bottom of the

board6 the connectors6 where the

enclosure top and enclosure

bottom meet6 etc.


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+omplete the top cut outs b( dra!ing lines across the edges and using the push5pull tool to lo!er each side !all.

The completed enclosure.

Designing a ounting "racket or the #nclosure

* designed a bracket for mounting the enclosure to a flat surface. The bracket has '.'&'> clearances to each edge

of the enclosure as well as '.'&'> clearance to the top and bottom surfaces of the enclosure. 1ll bracket walls are

'.&''> thick. 1cross the four legs on the bottom are #*N?-1 countersinks for /" screw heads.

The bracket works by bolting it

to a flat surface then snapping

the enclosure into the bracket.

The bracket design is a bit more

complicated than the enclosure

design but the techni+ues

outlined in this tutorial still

apply. The important parts to

remember are the clearances

and wall thicknesses. 1gain all

walls are '.&''> and the

clearance from any surface of the


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The mounting bracket or the enclosure.

The enclosure mounted in the mounting bracket.

bracket to any surface of the

enclosure is '.'&'>. The inside

corner radius is '.&4'> and the

outside corner radius is '.4>.

#,porting the ST

To "# print the model6 you will need an ST( file. To generate the ST( file6 you2ll need the Export ST( pluginfor

SketchUp. $nce the plugin is installed6 you2ll need to export the different pieces of the enclosure in separate

files. $pen the SketchUp file for the enclosure. Select the top half of the enclosure then select Export ST(F from

the ile menu.

/ake sure GExport Selected 0eometry $nlyH is checked6 export unit is G/odel Units6H and ile ormat is G1SC**.H

Click GExportH and save the exported ST( with a recogniIable filename and in a convenient location.

)epeat the above process except this time select only the bottom half of the enclosure. *f you designed a

mounting bracket or want to print the mounting bracket from the tutorial example files6 select the mounting

bracket and repeat the process a third time.

$nce the three files are exported6 move on to the next step to check the manufacturability of your design.

+hecking the ST or #rrors

Netfabb !asic is a free version of Netfabb. Netfabb is a tool for checking the manufacturability of ST( designsusing the "# additive printing processes. #ownload6 install6 and register the tool. $nce it2s setup6 launch the

tool.

or each ST( file to be printed6 repeat the following process8

Select %ro


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To run a design analysis6 select Extras ,J New 1nalysis ,J Standard 1nalysis. The analysis will run and a box in

the lower right hand corner of the screen will list some information about your design.

etabb "asic part anal(sis output or an ST ile that is read(

or manuacturing.

or your part to be manufacturable6 the number of shells needs to be e+ual to & assuming you only have one

part in the ST( fileD6 the surface must be closed6 and there should be no flipped triangles.

*f there2s a problem with your design6 you can let Netfabb !asic attempt to repair your ST( file automatically or

you can fix the design in SketchUp6 re,export the ST(6 and check the ST( file again.

0enerally speaking6 one of three things happens to make your design fail manufacturability checks8

)eversed faces. The back sides of the faces in SketchUp are drawn in a purplish color. 1ny exposed

purple face is a reversed face. To fix reversed faces in SketchUp6 select any faces that appear purplish and

select Edit ,J ace ,J )everse aces. The faces should appear grayish now.

&.

/issing external wall. /issing external walls can be found by orbiting the module and looking for holes

in the external surface. To fix a missing external walls6 use the line tool to draw a line from one existing

point to another existing point along the surface where the face should be. SketchUp will draw the

missing face as soon as the line is completed.

.

*nternal walls. *nternal walls are the most difficult problems to locate because they are internal to the

model and are completely hidden by the model2s exterior walls. They can be found using a combination

of the SketchUp Section %lane tool and by viewing the model using the K,ray style 5iew ,J ace Style ,J

K,rayD. 0enerally speaking6 you2re looking for any faces that are internal to the model. These faces need

to be deleted once they2re found.

".

or more details on repairing a model6 Shapeways has a great tutorialon using Netfabb !asic to repair a part2s

geometry.

8rdering the #nclosure $arts

$nce the parts are fixed6 it2s time to "# print them either using your own printer or using a service bureau. Since

* don2t own a "# printer yetD6 * have to use a service bureau to print my models. The two services that * have

used are Shapewaysand Sculpteo. They both print models out of %1'' nylon using a selective laser sintering

process S(SD on E$S ormiga %&&' printers. They both are relatively affordable and offer a variety of colors and


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3D printed enclosures designed using SketchUp

finishes for your designs. Sculpteo tends to be a little faster " days for basic whiteD than Shapeways up to &'

days for basic whiteD.

Sculpteo offers the option of printing in colored plastic without surface polishing. Bhen printing in color with

Shapeways6 the surfaces are always polished. %olishing can knock down fine edges on a model. or example6 the

small thin walls between the two %hoenix Contact connectors in this design run the risk of being broken during

the polishing process. 1lso the enclosure walls may be a bit thinner at the top than they are at the bottom after

polishing.

*2d recommend creating an account on both services6 uploading the ST( for the designs to both services6 then

experimenting with different materials and finishes on each to find the optimum combination of material6 color6

shipping times6 and cost.

!e sure the model units and dimensions on the printing service match the units and dimensions in SketchUpL

Uploading a file exported in inches and selecting millimeters at the service bureau can result in a much smaller

"# print than expectedL Sculpteo has an option to download a blueprint of the model with the dimensions called

out. * recommend taking advantage of this to verify the dimensions of your model before printing.

1t Shapeways6 *2ve successfully printed these models out of their Strong M lexible %lastic and their %olished

Strong M lexible %lastic materials. Bhen using the polished material6 you may need to submit designs with thin

@ small pieces with the H%rint it anywaysLH option. This will cause them to skip their manufacturability checks

and print your model regardless of any design rule violations.

1t Sculpteo6 *2ve successfully printed these models out of white plastic and colored plastic. * have not used the

polished plastic option.

The 9esults

*2m happy with the results of designing and printing this enclosure. !elow are some photographs of the

enclosure in both white and red plastic with the mounting bracket printed in black plastic.


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The enclosure printed in red polished plastic and black plastic at Shape!a(s.

The enclosure printed in red polished plastic and black plastic at Shape!a(s.


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Same t!o enclosures. :hite versus polished red $2200 n(lon.

9esources

These designs are part of the my led,pixels !eagle!one !lack pro

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Como Construir Caixas Usando Sketchup