16-07-2013, 11:04 AM
(16-07-2013, 08:33 AM)AlanBeckett Wrote: I replaced the flimsy plastic door handle on our Fridge/Freezer with a hand-carved Ali. one - worked a treat.
Alan
I'm glad you mentioned that, since for a long time I have become increasingly irritated by manufacturers who use plastic for certain structural assemblies and parts where plastic is clearly unsuitable for the stresses and strains that that part or assembly will have to endure. In many cases, (but not all), for its intended use, that part would have been far more suitable for its intended task if it had been manufactured from metal - aluminium often (but not always) being a suitable alternative.
As for the argument that it makes sense (for the manufacturer) to make certain parts from plastic and other parts from metal - so that the life-span of each will be approximately equal - to me, that is a short-sighted view by the manufacturer. Suppose, for example, that an easily replaceable plastic handle snaps but, say, the motor is still functional. Assuming that a replacement handle is available (which it often isn't), I'm left with a defective appliance that will probably have to be scrapped for the sake of a cheap bit of plastic. However if the motor had failed, then since I know that that is a major and expensive part, although the item will still have to be scrapped, I won't feel so bad about it. Therefore the fitting of that plastic handle has left me feeling that the manufacturer cares not how I perceive the quality of his manufacturing (even if other parts, e.g. the motor) is of impeccable quality. Hence, when I do purchase a replacement item, I am immediately discouraged from buying from that manufacturer again. All very good - in theory. Trouble with that philosophy is, of course, that the proliferation of plastic is so manifest - and often in places that cannot be seen until dismantling has occurred - that there is, in reality, little choice available to avoid such built-in poor quality engineered products.
In summary, yes, plastic, as an engineering and manufacturing material, does indeed have its place in assemblies, but it tends to be mis-applied and over-used, to the detriment of the manufacturer and customer alike.
Al. / July16, 2013 //








