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  • Users: drawoh
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  1. drawoh

    Social Media

    I continue to be involved in my local chapter of a technology association in Ontario, Canada. The association has expressed concern about its members posting on social media. I am trying to wrap my head around the issue. I may have to explain this to members. Basically, I should be very...
  2. drawoh

    Flexible Assemblies (or parts)

    I am preparing drawings of a cable. The figure is something I threw together so that I could ask a question. In the figure above, my datum features are the one receptacle. I am showing profile and positional tolerances for the opposite receptacle, but what I can really calling up is the...
  3. drawoh

    Building Collapse in Toronto Kensington

    CTV News: Toronto building that was at risk of collapse was deemed 'unsafe' in 2014: records Toronto Star: Dundas West building that collapsed was deemed “unsafe” by the city — but case was closed in 2019 -- JHG
  4. drawoh

    Spot Weld Testing

    I am preparing a drawing of a stainless steel sheet test piece to test the set up of a spot welder. Our customer has called up a McMaster Carr part number that points to Stainless Steel 304 hardened to Rc40. Is (work) hardness a factor in spot welding? I assume we will try to rip this thing...
  5. drawoh

    SolidWorks Flexible Parts

    Has anybody out in Eng-Tips land played with flexible components? I want to install a flexible component into a pocket, make it flexibly fit the pocket, then I want to array it. It would be very nifty (and functional) if the components arrayed in their flexible state. Right now, they don't...
  6. drawoh

    Electronic Active Noise Cancellation

    I am being asked about this. We are building a workstation in our factory that will be noisy, perhaps around 110dB. We are installing sound insulation. The racket will kind of scatter around our plant. Apparently, we can install a speaker system that will monitor the noise and emit reverse...
  7. drawoh

    EMI/RFI Shielding

    I threatened to write a 19" rack box design procedure, and now I have done it. I have documented the lay-out and the DFMA. The one thing I am not sure about is EMI/RFI shielding. I am Googling it. Can anybody recommend a good book or article on EMI/RFI shielding of enclosures? --...
  8. drawoh

    Importing PCBAs

    Since 9:00am this morning, I have been importing a printed circuit board assembly. It appears that by the time I am done, I will have the information needed to fabricate each and every surface mount resistor, capacitor and diode on the assembly. It also appears that each set of tracks in the...
  9. drawoh

    Matweb.com

    Has anybody out there in internet land noticed that http://matweb.com/ is down? This will be a hard resource to replace if it is down permanently. -- JHG
  10. drawoh

    Machinable Ceramics and Threads

    Has anybody had experience with screw threads in machinable ceramics like Macor. My actual problem is that workers are pulling thread inserts (Keen-serts) out of G10 FR4 backing plates. I am looking for an electrical insulator that retains screw threads. -- JHG
  11. drawoh

    Spring Specification -- Fatigue

    I am examining somebody's custom torsion spring and I want to make suggestions about their drawing. What I want is for the drawing to call up spring rate and maxiumum rotation. This is inspectable for us, as opposed to verifying the specific alloy and heat treatment (which they did not call...
  12. drawoh

    19 inch Rack Boxes

    I am working with a customer's 19" rack mounted box, and I am thinking about writing a design procedure. There is just so much stuff to do wrong. Question: In what direction should cooling air flow through a 19" rack? I prefer in the front and out the rear. What do you all think out...
  13. drawoh

    CNC Programming Left Hand Right Hand

    If I prepare a machining drawing tabulated left hand and right hand, can a CNC programmer take advangtage of this, or do they have to write two programs? -- JHG
  14. drawoh

    Attractive Drawings

    I am reviewing drawings here and I am being a bit of an asshole. We are a manufacturing service company and all of our drawings may be shown to the customer. In addition to being clear, we need them to look good and professional. I am asking for well organized drawings with consistent fonts...
  15. drawoh

    Insert Custom Info into Excel Footer

    In an Excel file, I want to define custon properties, and I want to display these in the footer. I see all sorts of notes online about how to display properties and cell contents in the headers and footers, but none of it seems to work. I also see all sorts of menu items that are not on my...
  16. drawoh

    Positional Tolerances

    I am looking at some drawings that call up positional tolerances of [⌀]0.01mm. I am trying to make sense of a design where I do not have all the information, and I am preparing new drawings. Will a machine shop take that number seriously? What is the tightest positional tolerance I can...
  17. drawoh

    Equation Editor Volumes

    I am trying to do some analysis within SolidWorks' equation editor. When I assign "SW-Volume" to a variable, I get the message "Potential circular reference", and it takes much fiddling around to make it update correctly. I am trying to convert a film wrapping into a length value for the BOM...
  18. drawoh

    Videos and Other Training

    Can anybody recommend good videos on GD&T. I am in charge of a mechanical engineering team here and training is needed. I am searching YouTube. We will be working to ASME Y14.5[‑]2009. Maybe we should switch to the 2018 standard! -- JHG
  19. drawoh

    Granite Reference Surfaces, Gauge Blocks, Pin Gauges

    We are setting up ISO certification and we are setting up an inspection lab. We are planning to schedule calibration for our calipers, micrometers and other measuring gauges. Do we need to keep verifying our granite reference surface, gauge blocks and pin gauges? --...
  20. drawoh

    Could steam-powered cars decrease the CO2 in the atmosphere?

    Article on Salon.com. No, Salon is not an engineering journal. -- JHG

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