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demoncase

Forum Regular
  • Content Count

    839
  • Joined

  • Last visited

  • Days Won

    4

About demoncase

  • Rank
    Regular Poster
  • Birthday 11/17/1978

Additional Information

  • Airsofter since
    2002
  • Toy collection
    Xm8, M4SOPMOD, M4a1, XM177, M16VN,M16a2, M14, SSG69, Uzi
    M9 Stainless FMV, USPc, Mk23, Constrictor, 1911a1
  • Most likely to say
    *groan* Anyone got some painkillers?
  • Country
    United Kingdom

Contact Methods

  • Website URL
    http://www.dcairsoft.com
  • ICQ
    0

Profile Information

  • Gender
    Male
  • Location
    Wolverhampton
  • Interests
    Airsofting, Motorcycles (Riding/falling off/repairing), Cocktails, organising, military history.

    I'm a professional Quality Engineer and used to be a Material Scientist working for the M.O.D,
  1. demoncase

    Snoopy's Initial Impressions on the Tokyo Marui MP7A1 GBB

    My pleasure.... I get a bit bored with people stating 'it's failed cuz its poor quality' without any qualification or analysis.
  2. demoncase

    Snoopy's Initial Impressions on the Tokyo Marui MP7A1 GBB

    Going back to nozzle failures earlier in the thread: That looks like a brittle failure, rather than an overstressed failure, judging* by the shell-shaped tide marks in the failure face on the pictures shown. This is an injection moulded part- Understand that an injection mould will have 3-50 part spaces in each tool, so a single 'shot' produces as many as possible. It's most likely that there are 10 or so nozzles in each shot. If the tool is poorly designed and/or process controls aren't being adhered to, you often get the part-mould furthest from the shot being poorly cast- The plastic is cooling and not flowing as well, so you get 'cold weld' lines which will result in creating a stress raiser in use- The crack is already there, and it's a question of when not if it fails....I've seen this in metal-injection moulded parts and polymer parts equally over the years. This happens over time and as the mould wears- each shot of molten plastic reduces the polish on the inside of the tool, increasing friction and slowing the time the plastic take to travel around the mould. Without regular refinishing of the tool, you can even get 'short shots' where some parts aren't fully 'filled' with plastic. What's at fault here- again extrapolating based on experience- is probably QC not picking up that the process has drifted over time and a small proportion of each batch are non-conforming....In this case, without something like a dye-penetrant inspection of every part, it's hard to spot cold weld on dark plastic parts- short of reported failures. You only use dye-pen on safety critical components due to the cost/time implication, and that ain't airsoft. You can test-to-destruction a sample, then accept or reject the batch- but if there is a variation across a batch (as I describe) it's luck of the draw if you get a non-forming one.....and here we are.... The airvoid in that first noted failure is telling- that's clear a symptom of poor material flow inside the mould as I describe above. Just to note- these are problems that EVERY manufacturer of injection mouldings has to keep on top of- airsoft or not....I went into Homebase to buy a new kitchen bin a few weeks ago and found the 'reduced to clear' ones all had a clear 'cold weld' line running down the length of the body. I didn't buy one. Would all the above stop me buying an MP7 if I was in the market? Nope....It's a production hiccup, for my money. *Not wanting to get into an internet 'willy length' competion, but I've a Bsc in Materials Science, 5 years in a technical materials laboratory specialising in polymers and ceramics, 10 years experience as a NADCAP heat-treatment/chemical processing auditor and 15 years overall in the aerospace industry.
  3. demoncase

    SMG Picture Thread

    It's a Gerber Mk2. Popular with SOG, James Cameron and The Punisher to name a few
  4. demoncase

    DSC 9375

    Had a busy morning if you'd run through all the ammo in your belt, huh?
  5. demoncase

    Silenced Guns Picture Thread

    In lieu of an off-the-shelf Carl Gustav M45, here's my little effort....Based on an ICS M3 As well as my other 'Nam style silent sentry removal tools- .22 Hush Puppy and good ol' Gerber Mk2
  6. demoncase

    SMG Picture Thread

    In lieu of an off-the-shelf Carl Gustav M45, here's my little effort....Based on an ICS M3: All your silent sentry removal needs.... VERY front heavy now- it's an all steel unit I've had machined and custom blued...not 100% sure I'll keep it. Just to show everyone it's a slip on/slip off unit- single grub screw means I can convert back to the usual M3 style in seconds.
  7. demoncase

    pacman

    Or the Koolaid Jug....Ooooooh Yeah!
  8. Nice friendly chap, very quick postage, couldn't have asked for an easier trade - Cheers dude!

  9. Back from Bangalore.....

  10. Is offline until the 29th at the earliest. Anyone looking for a faster response should e-mail me.

  11. demoncase

    Shotgun Picture Thread

    This started life as a Tercel full metal/wood pump action- which is nice but not right for the diddy-bopping down them rice paddies in the Delta. So I: ~Stripped off the vile orange varnish on the wood ~Left it rough in places to simulate combat usage ~Stained it with dark oak ~Rubbed in about 7 coats of Danish Oil ~Ripped off the 'slugster' sights and added a 1970s 'Speedbead' at the front ~Added a 1960s dated utility strap. And got something rather more 'battle worn' for use with 'Nam period gear.
  12. Good seller, good coms andthe parts arrived very well packaged. Cheers Demoncase.

  13. demoncase

    1911 Picture Thread

    My current 1911s. WE MEUSOC with custom extended slide catch WE 1911a1 with real Colt wood grips WE 'Defender' clone- custom 'bobbed' hammer and grip safety, ambidextrous safety and fingergroove grips. Stainless steel custom paint
  14. Good seller, with good commincation and speedy service. Cheers. :)

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