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Recent content by bobc

  1. bobc

    I need to repair a Thrust Bearing

    My first shot would be your local bearing house. They all are hooked to repair facilities. My next choice is Messinger Bearing in Philly. They are experts at making large bore bearings.
  2. bobc

    Old German Materials designations

    I have winged it using the application a guide. I spec'd 954 for the heavy shock items and 660 for the gland bushing type stuff. The previous guy used 660 for everything and this didn't work out so well. Lots of mushrooming and crush failures. Thank you for the offer, when I get some time I will...
  3. bobc

    Old German Materials designations

    I am currently working on a very old and large hydraulic forging manipulator. We are scheduled to replace all the bronze bushings in this machine. Going over the drawings I noticed material designations I have never encountered before. One is an Rg13 which I thought was common 660 bronze until...
  4. bobc

    Bolt Hex vs Wrench Size

    Sorry guys, speed reading only works when you can concentrate. My Machinery'shows wrench opening tolerances on page 1435. the Twenty Fifth Edition. Next time I'll slow down when reding posts. Bob Creely
  5. bobc

    Bolt Hex vs Wrench Size

    The old standard for hex head sizes is bolt diameter + 1/2 the bolt diameter = hex size. Example 3/8" bolt head size is 3/8" + 3/16" = 9/16" hex size. The old standard for nuts was to add 1/8" making the nut hex 3/8" + 3/16" + 1/8" =11/16" , but now the nut and bolt hex are the same except in...
  6. bobc

    Question on a Compressed Air Leak

    try this site for simple solutions. http://www.scottsemicon.com/Ref_Airflow.html bobc
  7. bobc

    Orsta Hydraulik??

    Can anyone point me to the Orsta Hydraulik Company from Europe? I believe they merged several times in the last few years, and I now can't find who owns them. These pumps were popular on German machine tools.
  8. bobc

    Hydraulic Pump Information

    Can anyone tell me what has happened to the Orsta Hydraulik Co. ???? Orsta pumps were used on machine tools for lubrication.
  9. bobc

    Stress concentration at keyway for impeller with LOOSE FIT

    Try an old fashioned "Gib head" key that is tapered in relation to the bore keyway. These were and still are used on large bevel gears and sprockets for roll out conveyors in steel mills. The tapered key driven in the keyway imparts a "fit" to the bore to the shaft. I would recommend both the...
  10. bobc

    Coupling Two Shafts

    diskullman has the best answer. these couplings fit the bill and you are not reinventing anything. alignment is also perfect.
  11. bobc

    Thread calculations

    simplistic formula for tap drill diameter is: major diameter -1/number of threads. example 1" 8 thread = 1"- 1/8 = 7/8" drill. this is very close for all thread sizes. don't kmow if it is close enough for your needs. bobc
  12. bobc

    Sheet metal ring

    being that you only need 1 ring at .002 to .007 thickness, i would try a razor type gasket cutter rigged with a suction cup pivot. i have even cut shimstock at this thickness with ordinary machinist dividers honed to a sharp cutting edge, using multiple passes. if you need many pieces, then...
  13. bobc

    carborundum pollution control division

    can any one tell me what happened to carborundum's pollution control division???? i need information on an old dust collector system built by them.
  14. bobc

    pollution control equipment

    can anyone tell me what happened to the carborundum pollution controls division?? i need information on an old dust collector system built by them. thanks, bob creely
  15. bobc

    Returning leadscrew-Same direction rotation

    also try ball reverser. i have used these in the past for small spot grinders for hardness testing steel rolls. bobc
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