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    Britmodeller.com ! Modelling ! Tools & Tips ! Modelling Tips

    How to make photo etched parts at homeStarted by Cheshiretaurus , Aug 02 2013 11:58 AM

    photo etchphoto etch,, PEPE,, brassbrass,, etched brassetched brass,, scratch buildingscratch building,,

    Cheshiretaurus

    Making photo etched parts at home

    Many years ago I was a young apprentice in a small electronics company, one of my tasks was making printed circuit

    boards (PCBs) for prototypes and one offs. Making PE parts is a very similar process, so I gave it a go. When I made

    PCBs the boards were pre-coated and we used ferric chloride as an etchant, Im going to show you how to make a

    double sided PE using dry film resist. You will need to invest in some bits and bobs to help you along, nearlyeverything is on good old ebay, the rest you can get in Tesco, ASDA etc, and dont forget to pick up some wooden or

    plastic stirrers from Mc Donalds and the like. I wont write a long list now of things you need Ill leave that to the end

    and get straight to the interesting bits, You may not get success first time but keep practising, I had many fails at

    various stages getting this right so i'll share what I know.

    but first this :-

    Making photo etched parts uses some hazardous chemicals and as such safety steps should be taken

    in the form of protective clothing, gloves, goggles etc. The chemicals are corrosive to skin as well as

    to brass so should be immediately washed off with plenty of water if contact with skin occurs,

    medical attention may be required as well. By continuing to read this article you must accept that

    YOU are responsible for your own safety and should read all labels and safety data sheets available.

    Nuff said, lets get on with it.

    Artwork

    The artwork was printed on over head projector (OHP) film for inkjets this film has a rough and a smooth side. The

    rough side is the printing side. We are going to use negative resist film so when you create your artwork white is

    where you want brass and black is where it is to be etched away. You will notice the sprue gates are only on the rear

    art work this is so they get etched away from one side only and become half the thickness off the surrounding brass.

    Start off by creating your artwork without the gates so the parts are floating with no attachment to the surrounding

    frame, save this file call it front or something now make a copy of that file and call it rear. Open the rear file into

    your editing software and draw the gates in.

    You now have 2 files front and rear. Print your files using your printers best settings, on mine I have selected Print

    quality high, Use black ink only, darkness max, contrast max, high resolution paper. If your software can print

    alignment/crop marks, use them! If not add some crosshairs to your art work but they must be the same on both files

    so check for this before you create the second file.

    The two artworks are shown here, top is the front with the floating parts bottom is the rear with the 'sprue gates' (to

    be printed mirror image)

    Fold lines should be on the inside of the fold and twice the thickness of the brass.

    Posted 02 August 2013 - 11:58 A

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    Printing preference page

    manual ajustment pop up page

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    Because Im from up north and a bit tight, to save on OHP film print off one of your artworks on plain paper first,

    now you can cut out a bit of OHP film appropriate to the size of your artwork to include the alignment marks, tape

    this to the paper over where it is to print and put it back through the printer, same again with the other file. Print the

    rear one as a mirror image and let them dry for an hour or so.

    Ive tried using laser printers for the artwork but the blacks aren't as deep, I find the inkjet better.

    We have 2 artworks, the rear one should be turned upside onto a white surface or light box if you have one. Cut the

    top art work out so it just includes the alignment marks but make sure it smaller than the bottom one. Now carefullyalign the two together on top of each other with printed sides on the outside, this is where your alignment mark come

    into use, use a magnifying glass if necessary. When you are satisfied that you cannot get aligned any better put a piece

    of tape across one edge to form a hinge and make sure it doesn't move as you do so.

    We now have our art work prepared, did you make that second check that is defiantly aligned? If it has moved peel off

    the tape and do it again, super accuracy is required here if your PE is going to be of any use.

    Cut out a piece of brass just bigger than the artwork with scissors and give it a clean with Acetone, IPA or other

    solvent. I'm going to use a 0.005" or 0.125mm gauge sheet

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    Applying the resist

    The resist is a negative resist so the bits that get exposed to UV cure and harden while the unexposed bits stay weak,

    the resist should be stored in the dark and away from sunlight. It should also be kept away from sunlight and bright

    lights while your work with it until it has been developed.

    Switch the laminator on.

    Cut out two pieces of resist just larger than the brass, the resist is in between 2 protective sheets you need to remove

    one before applying to the brass. Take one piece and with two bits of tape on either side of one corner pull them

    apart, one of the protective sheets should come away, you might find it takes a couple of goes to get this.

    Put your brass on something flat that will be easy to turn around as you work, a hotel room key is ideal for this, make

    sure there is no dust or anything and put a big blob of water on it.

    Take your piece of resist, find the side without the protective layer (its the side that feels sticky if you touch it on the

    edge, dont touch the bit thats going on the brass) and gently offer this side to the brass, when it touches the water,

    the water will grab it, gently lower it on and let it settle. Check there are no air bubbles trapped, if there are just lift

    the resist a little and gently give the bubble a little persuasion to depart. You might need a little more water before

    lowering the resist down again. When youre happy that there is nothing there except a thin layer of water give the

    centre of the sheet a small press just to tack it into place and stop it slipping, then with a tissue or soft cloth work the

    water out from the centre dont press hard just yet, if you do it will tack that bit onto the brass making it harder to

    remove should you find an air bubble. Once you are happy that you have ALL the water out with NO air or water

    bubbles trapped smooth the resist down with a bit of pressure.

    Take a piece of paper and fold it in half, gently lift the brass off using a scalpel blade to break the adhesion and place

    it in your folded paper. The paper acts as a carrier to go through the laminator if you put the brass through naked it

    will get bent and damaged, also as its small it might get lost in there, with all the electrical hazards you might expect

    with a loose bit of metal rattling inside an electrical appliance.

    Once though the laminator, open up the paper, the resist will be stuck to the brass except where there is air or water

    trapped, you did get it all out didnt you? The overlap will also be stuck to the paper so take your scalpel and cut the

    brass sheet free.

    Do the same for the other side.

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    Exposure

    You need a UV light source, ebay has some ladies gel nail curing lights for 10-15, they come with four bulbs two

    above and one on each side, you only want the light going straight down through the artwork onto the brass so leave

    the side bulbs out and put them some ware safe, these are now your spares.

    You need two sheets of glass, I found two cheap 4x6 photo frames the ones that are just glass and wooden back in

    Tesco for 50p each kept the glass a threw the rest away.

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    Make sure they are clean, now slip your brass between the two artworks making sure you are happy with the

    positioning then sandwich this between the sheets of glass and clip together with bulldog clips. A quick check that the

    brass is still in the right place, no foreign objects obscuring things and the handles of the clips are not in the way.

    -Optional- You get a slightly sharper image if you remove the protective sheets at this stage however you run the risk

    of the resist getting stuck to the artwork if this happens you will need to strip the resist off the brass and start again.

    This is why the artwork has been prepared printed side out. If you get the resist on the artwork IPA or acetone may

    get it off (only clean the non-printed side) but you could end up having to print a new artwork.

    Expose this to UV light, I have a bit of cardboard clipped to the side not being exposed, this is just to stop light

    spilling round to the rear so you can remain in control of how much exposure takes place. Once exposed turn over,

    swap the card to the other side and expose the other side.

    Timing, getting the timing tight is critical, too short and your resist is not suitably hardened, to long and you start to

    expose the bits you shouldn't, remember the artwork is actually translucent the black bits dont block the light

    completely they just attenuate it.

    I have found 45 seconds per side seems to be the optimum timing, this will all depend on how dark your black is, how

    strong the light is, how close the bulb is, how old the bulb is. 45 second is for my setup yours may differ, some

    experimenting maybe required.

    Once done your brass should have the image on it with the exposed bits turning darker blue.

    Edit - You can use sunlight to expose but be careful as this is an unknown and variable quantity so you could end up

    over exposing it.

    Developing

    As I said earlier exposure to UV light hardens the resist leaving the unexposed areas soft and dissolvable in the

    developing fluid.

    The fluid we are going to use is a sodium hydroxide solution. Sodium hydroxide is caustic soda sold as household

    drain cleaner. We need to make a 5% solution of this. Im going to make 50ml of the stuff.

    1ml of water weighs 1 gram so 5% of 50g is 2.5g. you need to make enough to submerge the brass in your container,

    find out how much you need either in volume (ml) or measure the weight of the water (g) and multiply this figure by

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    0.05 e.g. 50g x 0.05 = 2.5g. This is how much caustic soda you need to weigh out. Dissolve this in your measured

    amount of warm water. Youve now made your developing fluid. Be careful, this is corrosive and will cause chemical

    burns.

    I warm the fluid up by leaving the it in the airing cupboard where it is 38c, Remove the protective layers from your

    brass with tape on the corner, once the protection is removed avoid putting the brass flat down on any surface, if you

    do the unexposed bits may well stick to it and you will be back to stripping and starting again. Dunk you brass in the

    fluid for 2-3 min to dissolve the unexposed resist, you will see it dissolving and turning opaque or milky. Then wash

    the resist away under a running tap, you can assist this by gently brushing it off with an old paintbrush under the tap.

    Have a really good look to see if you got all the resist off look carefully as it can be difficult to see. If there is any leftput it back in the solution for another minute and wash off again. Dont leave it in for too long however as it may start

    to dissolve the exposed stuff too. Once your satisfied you have got it all off put it back under the UV to see if you

    missed anything, if you did, strip the brass with acetone (see stripping at the end) and start again. Pain in the neck I

    know, but you havent yet etched it so you can reuse the brass. Better to find out now rather than once you've etched

    it in my opinion.

    Etching

    To etch we are going to use an acid to erode away the brass. Sodium persulphate is an etchant used in making PCBs,

    other etchants are available including ferric chloride, ammonium persulphate & potassium persulphate.

    For sodium persuphate a 20% solution is needed so multiply your weight/volume of water require by 0.2, so for 50ml

    of etchant weigh out 10g of sodium persulphate. I havent tried other etchants yet, so other ones may need different

    concentrations. This is also highly corrosive and will cause chemical burns.

    Find a suitable non metallic container and stirrer and dissolve the etchant in the appropriate amount of water in the

    same way as you made the developer, and warm it up for use, for me thats put it back in the airing cupboard again.

    (It may take a few minutes of stirring to fully dissolve.)

    Submerge the brass in the etchant, as the etchant tends to become more concentrated at the bottom give it a stir

    every 10 mins or so until fully etched. The pic shows pin holes starting to appear after 28mins and after 50mins it was

    fully etched. Keep an eye on it. I nearly over etched this one as I was writing this article at the time. Dont forget the

    areas that are going to be etched from one side only will carry on being etched until it is washed off and also the

    etchant will start to undercut from the sides. So as soon as you are satisfied that it is fully done. Remove it from

    etchant and fully rinse it under a tap.

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    The etching time will increase as the etchant becomes exhausted the more times you use it, the same will happen with

    your developer.

    Stripping

    Soak the PE in acetone for a few minutes to remove the resist, it should start to peel of but might need a little help.

    The acetone will become purple in colour and becomes a fantastic dye so watch you dont spill it, I have a bottle I

    keep the used acetone in just for cleaning PE. The photo actually shows it in water and is just for illustration!

    If all is well you've just made your first PE, go have a beer or three to celebrate.

    Things you need

    Brass http://www.ebay.co.u...=item5d304537b0 (http://www.ebay.co.uk/itm/Albion-Alloys-BRASS-SHEET-0-12mm-x-

    100mm-x-250MM-SM1-/400241801136?pt=UK_Toys_Wargames_RL&hash=item5d304537b0)

    Dry film http://www.ebay.co.u...cat=0&_from=R40 (http://www.ebay.co.uk/sch/i.html?

    _odkw=dry+film&_osacat=0&_trksid=p2045573.m570.l1313.TR0.TRC0.Xdry+film+photoresist&_nkw=dry+film+photoresist&_sacat

    =0&_from=R40)

    OHP film http://www.ebay.co.u...hp film&_sop=15 (http://www.ebay.co.uk/sch/i.html?

    _sacat=0&_from=R40&_nkw=inkjet+ohp+film&_sop=15)

    UV Light http://www.ebay.co.u...cat=0&_from=R40 (http://www.ebay.co.uk/sch/i.html?

    _trksid=p2050601.m570.l1311.R1.TR10.TRC0.A0.Xuv+na&_nkw=uv+nail+lamp&_sacat=0&_from=R40)

    Sodium hydroxide, caustic soda cleaning product section of ASDA Tesco etc

    Glass sheets - cheap photo frame

    Spatula http://www.ebay.co.u... spatula&_frs=1 (http://www.ebay.co.uk/sch/i.html?

    _sacat=0&_nkw=laboratory+spatula&_frs=1)

    Etchant Sodium persulphate, ferric chloride, ammonium persulphate & potassium persulphate.

    Couldnt find the Sodium persulphate I used doesnt seem to be listed,

    http://www.ebay.co.u...tchant&_sacat=0 (http://www.ebay.co.uk/sch/i.html?

    _odkw=pcb+etchant&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xetchant&_nkw=etchant&_sacat=

    http://www.ebay.co.uk/sch/i.html?_odkw=pcb+etchant&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xetchant&_nkw=etchant&_sacat=0http://www.ebay.co.uk/sch/i.html?_sacat=0&_nkw=laboratory+spatula&_frs=1http://www.ebay.co.uk/sch/i.html?_trksid=p2050601.m570.l1311.R1.TR10.TRC0.A0.Xuv+na&_nkw=uv+nail+lamp&_sacat=0&_from=R40http://www.ebay.co.uk/sch/i.html?_sacat=0&_from=R40&_nkw=inkjet+ohp+film&_sop=15http://www.ebay.co.uk/sch/i.html?_odkw=dry+film&_osacat=0&_trksid=p2045573.m570.l1313.TR0.TRC0.Xdry+film+photoresist&_nkw=dry+film+photoresist&_sacat=0&_from=R40http://www.ebay.co.uk/itm/Albion-Alloys-BRASS-SHEET-0-12mm-x-100mm-x-250MM-SM1-/400241801136?pt=UK_Toys_Wargames_RL&hash=item5d304537b0
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    0)

    Edit 28/8/13

    Looks like the Sodium persulphate is listed on ebay again

    http://www.ebay.co.u...cat=0&_from=R40 (http://www.ebay.co.uk/sch/i.html?

    _trksid=p2047675.m570.l1313.TR0.TRC0.Xsodium+persulphate&_nkw=sodium+persulphate&_sacat=0&_from=R

    40)

    Containers, I used lab beakers, do a search on Borosilicate beaker

    Scales, search pocket scales or micro weighing scales

    Stirrers grab a hand full at McDonalds

    Timings & quantity's

    Exposure 45sec per side

    1ml of water weighs 1gram

    Developer 5% strength 2-3mins at 38C

    Etchant 20%strength 45min to 1:30 at 38C (Sodium persulphate)

    Single side etch

    To make a single side etch, still apply resist to both sides of the brass and expose the rear completely. etching time

    will be double as the etchant can only eat through the brass from one side so has twice as much go through to meet

    the other side.

    I'll make updates to this as I find new things but in the meantime good luck!

    Mark

    Edited by Cheshiretaurus, 20 January 2014 - 09:22 AM.

    IainA

    Thanks for that. Bookmarked!

    Posted 02 August 2013 - 12:15 P

    John Laidlaw

    Excellent - thank you .

    Posted 02 August 2013 - 12:18 P

    hacker

    http://www.micromark...rsion,8347.html (http://www.micromark.com/micro-mark-pro-etch-photo-etch-system-

    export-version,8347.html)

    l know micro mark has a PE kit available but the chemicals are only for within the states but the rest of the kit is

    available in an export version. Been looking at it for a while but right not l do not have a suitable place to use it at the

    Posted 02 August 2013 - 12:35 P

    http://www.micromark.com/micro-mark-pro-etch-photo-etch-system-export-version,8347.htmlhttp://www.ebay.co.uk/sch/i.html?_trksid=p2047675.m570.l1313.TR0.TRC0.Xsodium+persulphate&_nkw=sodium+persulphate&_sacat=0&_from=R40http://www.ebay.co.uk/sch/i.html?_odkw=pcb+etchant&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.Xetchant&_nkw=etchant&_sacat=0
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    moment. Thanks for the post. I found it very informative

    Nigel Heath

    I have made PCB's in the past so I have most of the kit required to do this. An excellent tutorial, thanks for taking the

    time to do it.

    Oh and you don't realy need the UV light, strong sunlight works fine.

    Edited by Nigel Heath, 02 August 2013 - 01:58 PM.

    Posted 02 August 2013 - 01:57 P

    Cheshiretaurus

    Nigel Heath, on 02 Aug 2013 - 07:57 AM, said:

    Oh and you don't realy need the UV light, strong sunlight works fine.

    Good point Nigel that would work, I've added that in, but it carries a bit of a chance of over exposing.

    Added some more stuff in too and corrected some typos

    Posted 03 August 2013 - 03:16 P

    Black Knight

    Brilliant. Thanks everso for putting this up. Even if I never get doing my own at least I know how its done now.

    Posted 03 August 2013 - 03:40 P

    garry

    Many thanks for posting very good how to do, like this sort of thing always interesting to learn.

    Posted 03 August 2013 - 03:50 P

    gruffy

    Book marked! This has got to be one of the best threads on britmodeler!

    Posted 03 August 2013 - 05:49 P

    Dave A

    Coo, ruddy nora! That's really very clever, but I think Eduard are still going to be getting my business... I can just see

    my carpet after I've started playing with all that stuff...

    Posted 03 August 2013 - 06:20 P

    Nigel Heath

    I would like to bookmark this, how do you do that?

    Posted 03 August 2013 - 06:49 P

    gruffyPosted 03 August 2013 - 07:05 P

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    Nigel Heath, on 03 Aug 2013 - 12:49 PM, said:

    I would like to bookmark this, how do you do that?

    Are you on a pc, mobile or tablet?

    Nigel Heath

    Laptop at the moment, sometimes a pc.

    Posted 03 August 2013 - 07:16 P

    Cheshiretaurus

    Nigel

    Pressing CTRL+D together will save the current URL in your browsers bookmarks.

    Posted 04 August 2013 - 08:47 A

    Nigel Heath

    Oh so its just adding to my favorites, I did know how to do that, I thought bookmarks were something different.

    Posted 04 August 2013 - 10:54 A

    Cheshiretaurus

    Quick update the etchant I used is back on ebay http://www.ebay.co.u...=item336409fb18

    (http://www.ebay.co.uk/itm/500g-Sodium-Persulphate-99-etchant-Top-quality-/220721707800?

    pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=item336409fb18)

    Posted 28 August 2013 - 09:10 P

    HOUSTON

    Thanks for a very detailed informative thread.

    Posted 04 February 2014 - 10:34 P

    kev67

    Where do you put the waste material, after you have done the etching

    Posted 05 February 2014 - 09:28 A

    Cheshiretaurus

    kev67, on 05 Feb 2014 - 03:28 AM, said:

    Where do you put the waste material, after you have done the etching

    I have some plastic bottles I store it in between uses until its strength is exhausted, For disposal the sodium

    hydroxide can be flushed down the sink as it is after all drain cleaner, for the etchant it can be disposed of at the

    Posted 05 February 2014 - 01:04 P

    http://www.ebay.co.uk/itm/500g-Sodium-Persulphate-99-etchant-Top-quality-/220721707800?pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=item336409fb18
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    HOT 23 replies1,015 views

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    23 Apr 2014

    Aircraft Modelling!Work in Progress - Aircraft!

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    KING TIGER Reviews, News & Walkarounds! Reviews!Armoured Fighting

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    01 Feb 2014

    Modelling! Tools & Tips! Casting!

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    HOT 49 replies2,018 views

    hgbn01 Feb 2014

    waste chemical section of your local tip .

    Edited by Cheshiretaurus, 05 February 2014 - 01:17 PM.

    Radleigh

    Brilliant, need to save that little lot.

    Posted 05 February 2014 - 01:11 P

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