I'm building a purgola (some people call it an arbor) in my backyard and I'm in need of standard footing details for a four post pillar. Each post is a 4x4 (douglass fir no.1). I'm grouping four of these per corner to support the 24' long 4x12 beams. Does anyone know were I can obtain...
Ajack1,
I was a checker and designer for the better part of the eighties and nineties. The company I worked for made Class 8 trucks (Big Rigs) and employed over 80 engineers and a dozen or so drafters. It was my job to enforce those company standards that were relevant in order to ensure...
XZWHHL,
If you have no company specific standards governing a non-ASME-Y14 symbol, then consider revising the symbol to current standards to clarify it's meaning....no todo lo que es escrito es ley.
Which part of Mexico....Puebla?
EWH,
I have to disagree along with you. Use Position callouts when controling holes that require a Fixed or Floating case. Mating holes benefit from this formula. You've answered your own question.
However, non-mating holes used for weight reduction or holes used for venting may not...
Dingy,
You have the concept correct. The rule of thumb I follow is to apply Form, Orientation, and Profile controls to components or assemblies that would prohibit the use of tight size tolerances such as seperable and non-seperable assemblies. If you're working on parts with tight size...
Size tolerance will also control flatness. If the size tolerance value is the same or close to the flatness value, no need to add a redundant flatness callout....the end product will be the same. In addition to form, size tolerances may also control profile, parallelism and orientation.
Drawoh,
See my reply to EWH. The reason shops are able to cover up the lack of understanding is because their machines can make the parts using the dxf file accurate enough to exeed specs on the drawing. The drawing is most likely just used as reference at the machine shop. I worked at a...
Ctopher,
You hit the nail on the head. My concern is not everyone involved, that should be, has jumped on the bandwagon with us....which is why we're not further ahead than where we should be. In fact, we're slipping back every time they ask for a 3d cad file.
EWH,
The people in-house are...
Ctopher,
Do you recall the big push towards converting our coveted archaic inch system to metric? Back in the mid eighties, I was working for a Class 8 truck manufacturer that adopted the metric system on all cad drawings (we used Cadam back then). The problem we encountered time after time...
Heckler,
Half the battle is having your Inspectors know GD&T as much as you do....consider youself blessed if they know more. The other half is having your Machinist know GD&T as much as you. The odds are pretty slim however since this is not the norm. All our contractors are AS9000 certified...
Heckler,
There will always be mistakes with documentation in our industry. It's a long road when trying to standardize the company you're working in. No doubt your experience reflected a lack of coordination with industry standards. In regards to the original question, are you familiar with...
Drawoh,
Even with a competent shop, have you ever spoke ANSI with the machinest who's making your part? Find me one who knows as much as you or I and I'll add that shop to the list. Most of the time, if not all, they'll have your drawings taped to their CNC and recalculating the dimensions to...
