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  1. LONDONDERRY

    recommended type of drawing

    Greeting- I work as a mech-e in Semicon industry and have a question on what type of drawing this should be. Exclusively all our drawings are either, mechanical, electrical and some facilities. Our company purchasers deal with machine & sheet metal shops and cable houses for electrical...
  2. LONDONDERRY

    Text justification on the Revision Description of a Rev table

    Does anyone know if the text (not Headers) within the revision description of a rev table or block is left or center justified? I searched on this website and within a drafting book and found nothing that mentions this. Frank
  3. LONDONDERRY

    recommend a decent mechanical drafting book.

    Greetings- Can anyone recommend a decent drafting book for mechanical engineers. A few of the Green mechanical engineers seem to lack basic drafting skills
  4. LONDONDERRY

    Do air cylinder breather vents become clogged?

    Greeting. We are using a Festo air n/c pinch valve in a harsh environment with copper oxide powder. I've noticed the breather vent seems to be dirty with CuO powder and might be effecting the pinch valve orifice opening size and the time to open. my question is do breather vents become...
  5. LONDONDERRY

    Mohs Scale for HardCoat Anodizing MIL-A-8625A, Type III

    We have a 6061-T651 aluminum piece that is hard coat and they PTFE sprayed. Our customer is highly concerned in their application how hard this material is. From my research everything points to Rockwell C 60-70 but what would that be in Mohs? what is the conversion factor? I had one place...
  6. LONDONDERRY

    how to spot a bait and switch job on a interivew

    Recently I had a phone interview with HR, for a Senior R&D Mech-E position. Its a small outfit US headquarters, but part of a larger EU company that make metering flow valves, which I have very little experience with. I sent over some portfolio examples to HR and it impressed the hiring...
  7. LONDONDERRY

    Preparing for a interview

    I have a question in how to prepare for an Senior Mechanical Engineer interview. In past interviews I've brought a portfolio with past projects I've worked on. I've brought product pictures, some detail drawing of sheet metal, machined and wiring drawings plus some product tree drawings...
  8. LONDONDERRY

    resctrictive access to power switch

    The company I work at designs kiosk systems and recently a customer has requested we restrict access rom the public to the ac on/off switch. Currently we have lock boxes on the external ac power cords to prevent the public from pull out the plug, but I don't think you can completely restrict...
  9. LONDONDERRY

    Revision History Block

    Our Configuration engineer and I have a slight debate on if a Revision History Block is allowed beyond Sheet 1 of a multiple page detail drawing. I looked it up and its says it permissible on multiple sheet, but the description has to say "SEE SHEET 1" the CE says its not allowed ever. can...
  10. LONDONDERRY

    Job title differences

    So I got a question on job titles: Recently I've been working as a senior mechanical engineer for a company, heavy on the software side but has product design. Since January, our company is outsource more and more mechanical projects to a local contract manufacture (CM) and the projects I'm...
  11. LONDONDERRY

    how to approach these types of drawings

    I've created a 3d model concept, next detail out the parts (mostly packaging foam), they are sent to case manufacture (similar to Pelican cases). They review the drawings, start to make the case and have to tweak the foam to make the devices inside fit. The drawings more or less give the...
  12. LONDONDERRY

    In seek of career advice

    Greetings: Recently a former co-woker "Ken" from 15 years ago, I still keep in contact with, called me last week about a ME position as a company he's at, small group division which is part of a larger company. Never turning away from an oppertunity, I send him my resume. Yesterday he called me...
  13. LONDONDERRY

    Balloon Callouts

    When I delete or add a part in a 3d assembly the related 2d drawing BOM renumbers all the callouts. Is renumbering balloon callouts permitted according to ANSI drafting? I couldn't find where it says its not permitted but I though I throw the question out here. Personally I don't think it...
  14. LONDONDERRY

    ABS vs Polycarbonate

    Greetings- Recently, I inheriated a design project from a previous mechanical engineer no longer with the company. The design is a mobile suit case that is approximatley 20"x30" x 10". Inside is a laptop, docking station, camera, flash and other electronic devices. All of the previous...
  15. LONDONDERRY

    RECOMMEND AN ADHESIVE

    Can someone recommend an adhesive with the following requirements?: 1. Bonding clear polycarbonate, clear ( machined surface) to black anodize 5051 aluminum sheet metal 2. Cure within seconds or 1-3 minutes 3 Small bottle, no two part adhesive ( has to be used by field service) 4. exposure to...
  16. LONDONDERRY

    Machine shops and metric drawings

    So I had this meeting today with SMC, a machine shop and material manager and have any of you guys ever experience a fabrication house that says "...well the reason the we're late on deliveries is because the drawings are all in metric and we're not use to that standard, if they were english...
  17. LONDONDERRY

    Engineering BOM's vs Supply Chain BOM's

    Greetings- I'm getting into a heat debate with my company's supply chain (s/c) department on BOM structure and ECO workflow and using Agile PLM for managment Typical scenerio is I've been tasked with a design project. I complete the design in solidworks, then using Agile I create the BOMs, load...
  18. LONDONDERRY

    Best method for documenting this design

    Geetings: Our company has worked with a case manufacture (similar to Pelican Cases) to develop a semi-custom case for our needs. Its a scenerio where the vendor has an off-the-shelf case and we asked them to tweek it. The case has a retractable handles, wheels, latches and protective...
  19. LONDONDERRY

    Rubber Stamping on ECO Reviews

    Greetings: I work as a mechanical (only mechanical) engineer for a rather large company, that is more heavy on the se and program manager side. Recently we implements Agile PLM for our ECO workflow process. I helped define two workflows one for engineering prototype development and another...
  20. LONDONDERRY

    Stiction on plastic cards

    Greeting- I work for a company that makes ids that are printed on plastic cards the size of credit cards/ drivers licenses. The card stock is coated with silica and some are not. I was tasked recently to resolve the jamming issues we have been experiencing with non-silica card. I've come to...

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