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Recent content by Grunchy

  1. Grunchy

    Draftsight 2019 - no longer Free

    I too am running Draftsight free version after 31-Dec-2019 by editing a couple keys in the registry and defeating the registration reminder. To get rid of the activation message just open Regedit.exe and navigate to: “HKEY_CURRENT_USER\Software\SWActivation\K2” Delete any sub key and value...
  2. Grunchy

    Shrink fit "frictionized" by application of a colloidal silica solution?

    Good point tbuelna & EdStainless, but I think the surfaces must be coated & dried prior to heating the gear & chilling the shaft. It's like a suspension of colloidal silica in a water carrier, the water would boil on the hot side and freeze on the cold side. So it can't possibly be used as an...
  3. Grunchy

    Shrink fit "frictionized" by application of a colloidal silica solution?

    Hi guys I did some math... used the tribology-abc calculator: http://www.tribology-abc.com/calculators/e6_2.htm Inputs: di=0 (solid shaft) d=80.9752mm (3.188") do=314.6806mm (12.389" root diameter) L=50.8mm (2.00" engagement) δ/d=0.001882 (0.006" interference ÷ 3.188" diameter) <-- highest...
  4. Grunchy

    Shrink fit &quot;frictionized&quot; by application of a colloidal silica solution?

    I'm having a hard time finding information anywhere in the literature. Co-workers are drawing a blank as well. The issue we have, on an existing assembly, is a relatively heavy shrink fit between a gear and an intermediate shaft (width 2.00"; ID of gear Ø3.1880/3.1890, 63 microinch finish; OD of...
  5. Grunchy

    Pressure rating on a tank return manifold

    Hi, yes that would be bad. But seriously it is just a collector manifold that dumps into the supply tank, forgive me if I wasn't clear enough, the supply tank is at ambient pressure conditions. If I was to make a guess what the collector manifold is pressurized up to, it might be as high as 10...
  6. Grunchy

    Pressure rating on a tank return manifold

    Good afternoon everyone, There is a welded manifold fabricated from 1.5" square ERW tubing and half couplings, it is a collector of a number of case drain lines from some hydraulic pumps. The hoses come together to the manifold because there is a temperature gauge on each line for monitoring...
  7. Grunchy

    Can gears with ZERO backlash work properly?

    You know, thinking about it overnight, is it possible to incorporate something like a one-way clutch? You are driving a load that overruns its drive 4 times per rotation. Perhaps that's a good thing -- just let it overrun by the clutch slipping. That way you avoid having to do something like...
  8. Grunchy

    Can gears with ZERO backlash work properly?

    Check out Ikona Gear, they have a patented non-involute gear design that features zero backlash. Here's a technology page with a little movie that shows how it works: http://www.ikona.ca/technologies.shtml Smart!
  9. Grunchy

    AGMA Gear Failure Investigation Course

    Interesting, but.... does that AGMA course only deal with failure analysis, or does it have any content dealing with worn yet working gears? I'm more interested in determining if a gear set is worn out and should be replaced, before it breaks. For example, how to determine an observation...
  10. Grunchy

    Trouble finding symbolic solution for trig integral

    Please see attached picture. I tried to find the symbolic solution for this trig integral, it gave me a funny solution with all complex terms (L, x and b are distance measurements, P0 is a pressure term). It finds a numeric solution just fine, but I can't get a decent symbolic solution. Any...
  11. Grunchy

    Column width

    OK I found out some info regarding column widths and row heights in Excel 2000, this is after extensive experimentation so it may be of worth to anyone else printing from Excel. First of all, I found out that the minimum margin size is 1/4&quot;. If I try to set any margin to less than...
  12. Grunchy

    Withdrawal Resistance of Lag Screws in Wood

    Much obliged, &quot;boo1&quot; and &quot;Taro&quot;! The linked resources are indispensible, thank you kindly!
  13. Grunchy

    Schematics

    I'm not sure what you mean by &quot;fastener schematic&quot;, maybe you mean to create an exploded view including fasteners? I like Solidworks, but I also use Corel Draw for things like this. I put everything into PDF files since everyone here can use Acrobat. Some people may like Visio...
  14. Grunchy

    Withdrawal Resistance of Lag Screws in Wood

    Hello, What effect does &quot;edge distance&quot; have on lag screw withdrawal resistance in wood? I need a source as well, just let me know your source and I'll look it up! I found in &quot;Standard Handbook of Fastening and Joining&quot; a chart that was reproduced from AF&PA source, wherein...
  15. Grunchy

    Internal Thread Stripping - Revisited....

    Wait a minute.. just exactly what is the failure mode here. Is it stripping when you remove and re-tension the bolts after about 1,300 times, or are the bolts falling out during sawing, or what? If you don't have bolts falling out when sawing then your thread lock solution, whatever it is, is...
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