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Hi Pat Yes i can have it as you suggest. Does that make a 10mm deflection easier to achieve? Cheers opticsman

Thanks all, Pat. I think you have helped me in the past (I tend to mainly ask questions on materials/mechanics as its not my area). Can overmoulding be over a certain area only (45 mmdia?) otherwise i assume composite would have same flexibility throughout. How does overmoulding work? is it...

Hi Pud, this is like a push button so whatever pressure a finger can exert . Its only the inner 45 mm i want to be flexible, Thanks opticsman.

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...

Thanks. I can support cylindrical shape with circular cross member (that itself would need to snap fit to vertical wall of cylinder ) it mainly the snap fit features I want to find out more about ( wrt joining thin plastic components) . This item is intended as an idiot proof self-assembly item...

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 )...

Hi Do you actually need steel or will another hard material do? Nickel is relatively hard and can be plated onto brass.

Hi Thanks. Thats an idea. How do you etch nickel ( not my area) ? Also can you remove nickel evenly this way?

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...

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...

hello Pat .Again very Useful Thanks . What is your background /role ? is it permissible to have your contact details? Opticsman

Hi all , great help, thanks for that. Is there a polymer or combination strip that will bend with moisture. I am thinking of the fortune fish material ( cellophane I think), but something more robust and repeatable?

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.

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...

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...

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...

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...

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...

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...

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...