Blueprints

[sheepherder]

Originally Posted by mvray

Now let me make a comment to the fellow machinist reading this, these are machine drawings for us, not parts diagrams for people to look up names and locations of parts.

I have a machine tools background, and studied drafting at university. I still have problems reading these drawings, because I was not raised in that culture at that time speaking that language. Simply translating the words is not sufficient; you need to live the life to understand the mindset behind the words. Anyone with teenage children knows these problems. Even something as seemingly simple as a set of blueprints needs a translation to be understood.

The Metric system is a whole 'nother set of headaches, to us that were raised on the Inch system. It even affects tolerances. Metric tolerances can be greater or less than a comparable Inch tolerance, but are definitely different. Clearances the same.

I find that names I routinely use are not the same as their German equivalents, and other parts that I identify differently have that name...(if you can follow that)...

Having notes on the prints helps somewhat, but it is still a struggle (for me) to translate these prints into something I can actually use.

Just my $.02 for the day...

[mvray]

Just thought I would drop a note in to tell John that I just used his blue prints! I have a DWM I swapped a buddy for that I am rebuilding. I needed the complete firing pin assy (pin spring and guide), a complete side plate, and trigger and spring as well as the main toggle pin to pin the toggle assy to the upper, as the Germans call it the der starke verbindungsbolzen
Unfortunately some fine person who had possession of her in the past had beat the ever loving snot out of her and rolled a burr over into the ID, sorry Inside Diameter I forgot I am not at work. If that were not abuse enough someone did the worst job of nickel plating I have ever seen, there must have been .002 of nickel on her in places AND under that was copper, why I have no clue, I guess they thought the nickel needed primer. After spending 3 days in the Brownell's nickel striper and 2 days in ammonia and hydrogen peroxide, both of these operations should have taken a couple of hours at most, there is still residual plating in the hole.
Anyway this is all to say, when the pin did not enter the hole and I saw the problem; I checked Johns wonderfully clean drawings to discover the diameter should be 7.2mm +.02mm/-.00mm with a pin diameter of 7.18mm +.00mm/-.05mm.
I just got off MSC's website and ordered a reamer in 7.02, by Wednesday that little problem will be solved!

Thanks John