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  1. Philrock

    Engineering calculator recommendations

    I bought an old, but little-used HP 15C on ebay a few days ago for $145. I don't have it yet - keeping my fingers crossed that it's in as good shape as the seller claims.
  2. Philrock

    Engineering calculator recommendations

    Guys, thanks very much for all your responses. I must say - it's been an eye-opener. John Baker and electricpete, for some of the reasons I don't want to use my smart phone as a calculator, see Gunman's response below. Additionally, my phone has a rounded back, so using it as a calculator...
  3. Philrock

    Engineering calculator recommendations

    My HP11C calculator finally bit the dust, and I'm in the market for a replacement. I bought an HP35s, but I'm not very pleased with it. I'm looking for suggestions on what to buy. My 1st calculator was an HP35. I paid $400 for it in the early 1970s. It had all the horsepower I needed, and...
  4. Philrock

    Bore size for cutters for Sykes 5E

    Thanks very much, gearcutter. Looks like we'll need to have the shop measure the machine.
  5. Philrock

    Bore size for cutters for Sykes 5E

    My client needs to purchase herringbone shaper cutters for a Sykes 5E machine. We have all the specs we need except for the cutter bore size. My client and I are in California. The Sykes machine is at my client's vendor's shop overseas. Question: what is the correct bore size for cutters for...
  6. Philrock

    Electrical runout in gearboxes

    I have never heard of electrical runout. Can you explain what this is?
  7. Philrock

    Engage large threads without cross threading

    Guys, Thanks very much for your input. Geesamand - speed and running accuracy running requirements are low, so end play allowance is fairly generous - it amounts to about 29 degrees of rotation of the adjuster. Greglocock - I like your idea - I'm going to give it a try. I'm also going to...
  8. Philrock

    Engage large threads without cross threading

    I'm designing an axial adjuster for positioning the outer ring of a tapered roller bearing, to control end play. One method for doing this is to use shims under the retaining flange. My client and his customers have been doing this for decades and have found it very awkward, and have asked me...
  9. Philrock

    4-bolt flange block spherical roller bearing

    Thanks Terry, These bearings come with or out without axial float ability. I'll use one float and one non-float on each shaft.
  10. Philrock

    4-bolt flange block spherical roller bearing

    I have a heavy duty application for a 4-bolt flange block spherical roller bearing. The shaft rotates, so secure mounting to the shaft is important. Locking collars at both ends of the bore would be adequate. While looking for a bearing, I found the Moline Bearing M3000 Even-Lok series...
  11. Philrock

    Straddle mounted double helical gearing

    Thanks Terry, The HS gears will made separately then pressed onto the LS pinion shaft. The HS and INT shafts will be free to float axially.
  12. Philrock

    Allowable stresses for plated springs

    Are there rules of thumb for additional safety factors or reduced allowable stresses for helical coil round wire compression springs with the following finishes? zinc electroplating zinc mechanical finish gold iridite passivation Thanks, Phil
  13. Philrock

    AutoCad 2000 / 2013 migration

    TerryScan, Thanks for your input. Looks like I'm in for a project.
  14. Philrock

    AutoCad 2000 / 2013 migration

    I already installed a trial version and started trying the migration. It's problematic, to put it mildly. It looks like the lisp routines will migrate, but I can't yet tell whether the screen menu will migrate. I was hoping to bypass a major research/develpoment project by using this forum.
  15. Philrock

    AutoCad 2000 / 2013 migration

    I'm currently using AutoCad 2000 / Win XP. I've written my own extensive screen menu, and I've written and download dozens of AutoLisp routines. The screen menu and AutoLisp routines are essential to my productivity. I'd like to upgrade to Win 7 (already have new machine) and AutoCad 2013...
  16. Philrock

    Bell crank linkage problem

    I agree with Compositepro, as far as solving your problem with simple pivot ended rigid links. Is there any reason a chain drive as Compositepro suggested would not work? A rather inelegant solution would be to make both wheels into gears, and replace the links with racks. It would be...
  17. Philrock

    Help identify casing hanger threads

    Never mind - I found it in API 5B - it's called "casing long thread."
  18. Philrock

    Help identify casing hanger threads

    I'm reverse engineering an 11" 3,000 lb. casing hanger, and would appreciate some help identifying the tapered threads at the ends of the fitting. The threads have a 5.545" diameter x .55" deep lead-in recess, and the threads are about 3.4" long. I have been told that they 8-Round threads. I...
  19. Philrock

    Metric drawing for inch gear?

    All, Thanks very much for your help. I used mixed units, as you suggested. The drawings are done and the client is very happy with them. philrock
  20. Philrock

    Metric drawing for inch gear?

    The reverse engineered gear has to be a drop-in replacement for the existing gear, so an approximate pitch match, for example, is not an option.

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