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  • Users: opticsman
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  1. opticsman

    flexible plastic plate

    Hi all, I want to produce a circular plate (70 mm in diameter ) that is flexible in the central area ( 45 mm diameter but the annular part is rigid. I want to keep the number of parts to a minimum so hoping to avoid a a three component solution where I sandwhich a thin rubber sheet in between...
  2. opticsman

    permanent fixings in a moulded plastic component

    Hi All. I want to fix thinnish, flat moulded plastic components together without screws if possible. Something like a bayonet into a female latching/mating hole . Ideally once clicked together it would be a permanent fixing. For example I have a rectangular strip ( say 25 X 150 X 2 mm thick )...
  3. opticsman

    selective nickel plating

    Hi I have a block of metal that i want to electrolessly nickel plate but one face only. I want to precisely coat that face right up to its edges. I wonder if any can advise me what i can use to coat/protect the other faces to make them non conductive. Adhesive tape has been suggested but i am...
  4. opticsman

    moisture absorption in textile yarnes/fibres

    Hello . I am looking for a list which compares the moisture absorbtion values of textile yarns ( synthetic and organic). Rayon and bamboo appear as highly absorbent yarns when i do an online search but I would ideally like to see a table listing various yarns if possible. My main interest is to...
  5. opticsman

    polymer equivalent to a bi-metallic strip?

    Hi all, Is there a commercially available all polymer/plastic equivalent to a bi-metallic strip? I am looking for something that could be integrated in an injected moulded product. It needs to be reasonable cheap. Many thanks in advance for any advice or leads.
  6. opticsman

    simple one way valve

    Hi All. I am interested in simple one way valves ( such as the flapper type) . This is not my field but i wonder if this type would be suitable for use within a neoprene squeeze "bulb" ( like the hand squeezed blower used for dust removal- some have a nozzle). Would there any particular problems...
  7. opticsman

    neoprene bulb

    Hi all, I am interested in the technology behind the hand squeezed bulb type air blower used for blowing dust of items. I was suprised that there arent that many references to such items when searching online. I think giotto make something called a rocket blower ( silica gel is the material). I...
  8. opticsman

    Commercially available rervisble photoreactive polymers

    Hi All. I am interested in photoreactive polymers particularly the reversible kind. This is not my technical area and i wondered if any such materials are commercially available ( perhaps they only exist in purely University /research areas)? Perhaps i can widen polymer to "material" if that...
  9. opticsman

    metallic / reflective paint or coating fo rear surface mirror?

    Hi All I would like to make my own rear silvered mirror ( as opposed to a normal front silvered mirror) . The base material is acrylic . As i want to reflect light back through the acrylic I cant use a primer ( if a metallic paint spray). Can anyone suggest a solution to this? I dont care what...
  10. opticsman

    release agent / coating

    Hi all , I am having trouble selecting a suitable release agent / coating. I am trying to replicate a fine structured, metal surface by casting ( with a polymer resin) . The metal surface has a mirror finish. Can anyone suggest a suitable release agent or coating to use. I need it to create a...
  11. opticsman

    release agent / coating

    Hi all , I am having trouble selecting a suitable release agent / coating. I am trying to replicate a fine structured, metal surface by casting ( with a polymer resin) . The metal surface has a mirror finish. Can anyone suggest a suitable release agent or coating to use. I need it to create a...
  12. opticsman

    How to remove a polyurethane resin from a metal disc?

    Hi All . I am trying to produce a polyurethane resin casting of a bronze disc . The disc has grooves in it and after curing, the resin has got stuck in the grooves and elsewhere. I used a release agent but maybe didnt apply enough. I have tried heat cycling which worked to some extent but...
  13. opticsman

    simple generator?

    Hi all , I read a thread about this which mentioned generators for LED flashers in shoes and yoyos etc. Can someone kindly explain how these work and the key parameters . For example what determines the power or voltage available from such a device? I guess flashing lights on bycicles use...
  14. opticsman

    curable (heat) shrink material ?

    Hi all. I am looking for a heat shrink material ( ideally a yarn or something that could be made into a yarn). This will be part of a garment . Curing should not need any extreme form of heat or irradiation ( i.e. no health threatening UV) . Ideally the material should retain some...
  15. opticsman

    one-way valves for a flexible material

    Hello I am interested in finding out how one-way valves , work particularly those used in things like toy balloons, its not my area so would appreciate any help. The application is for use with soft flexible plastics. Would be by interested to know if there are different types , the simpler...
  16. opticsman

    direct replication of a metal part.

    hello . I am looking to replicate in machinable resin, a fine grooved metal surface . Surface structure has repeat features of around 30 microns or so. I normally get this done by creating a silicone mould of the metal then casting a resin into the silicone mould. Is there a direct way of...
  17. opticsman

    air flow through into network of pipes

    hello , I am interested in air flow through pipes but as it isnt my field I would appreciate your comments. I am trying to understand what happens if I start off with a large diameter input pipe and split it into say 10 smaller pipes. The flow through the large pipe is say 10 litres per second (...
  18. opticsman

    CIE photometric testing of indoor luminiares

    Hi All , I am interested in the CIE photometric testing of indoor luminaires. More particularly the conventions of the C-gamma photometric web. For instance what is the convention for the reference axis of a long luminaire ( i.e. such as a long fluoresecent lamp) relative to the c-gamma...
  19. opticsman

    metallization of plastics

    Hi All , I am interested in the metallizating of plastics ( to create a reflective surface) on materials such acrylic or polycarbonate. Can anyone one point me to the most cost effective technologies ? For example how are reflectors on torches ( flashlights ) made ? In my particular...
  20. opticsman

    Polymer stiffness V temperature question

    Hi . Not my normal area as my name implies. I would like to know about temperature effects on polymers ( or plastics) , particularly commonly available polymers . I understand that a lot of such polymers become less stiff with temperature but is the reverse possible ( in a common polymer?) . In...

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