Quote:
Originally Posted by SBranson23
PDI responded. I think they basically they say the undersizing is on purpose so the fit will be tight. Then essentially blames the tolerances of the aluminum pieces for the mismatch. Lame excuse as far as I can tell as I've worked on about 5 PTW barrels, both older gen3 and newer max ones and they've all fit together very well and don't need any undersizing to assure a tight fit. They told me to file the piece down. Lame.
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It's called tolerance analysis. I met PDI and talked to them about their bushings not press fitting into mechboxes consistently because they were attempting to acheive a dual press fit at the through and shoulder bores on the holes on cast TM mechboxes. Dual press fits on economically cast parts aren't a very good idea because you are hoping to nail precise press fits on two features instead of one. It's hoping that two planets are in perfect alignment when you pledge your AEGs soul to the perverted bat god of the of inanimate things. I got the same goofy response that their loopy customers demanded an extreme press fit so they were unwilling to give up on their shoulder press fit dream.
PDI obviously does not do a statistical tolerance analysis of TM (or other manufacturers for that matter) mechboxes as it works out that many of TM mechboxes will see some bushing fitment issues in at least one of the six bushing holes.
Designing a mass produced aftermarket part around measurements of only one example of a host machine is a mistake typical in the airsoft aftermarket. I see in slide fitment, mechbox fitment, metal receiver fitment etc. About the only parts that go together without any filing are the complete parts set of a TM AEG or GBB. I think they're the only company making assemblies that are robust for the tolerance of parts that they make.
Even the SystemA PTW has some fitment issues. I have noted that nearly every PTW I've come across benifits from some magazine catch adjustment. They've thrown the CNC'd manufacturing accuracy hammer at everything they could, but they missed it on the one sheet metal thing that they don't get to control so tightly.
Sorry. /end gripe