Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: NX687
  • Order by date
  1. NX687

    Update on SS to Tantalum weld

    Found a paper that said this weld area has such low tensile that a test piece cannot be machined into a tensile test piece But we have it sealing at 1000c and Ultra high vacuum , just so long as you do not flex the welded area,, or it will crack
  2. NX687

    Submerged Motor

    I got a weekend running out of a normal model plane Brushless, motor , bronze bushes substituted for ballraces Flushed in tap water , so far OK , running at approx 1 metre depth , thats about the limit of my 36 Megahertz radio reception
  3. NX687

    Submerged Motor

    Thanks Mike I will report if my ESC or motor dies on operation
  4. NX687

    Submerged Motor

    Ugh ,,,,, Has to be a no oil flush as residue would contaminate my pool with oil film ,
  5. NX687

    Submerged Motor

    Maybe a demin Water flush ?
  6. NX687

    Submerged Motor

    No No silicon near the brushes I did get a good 5 minutes each of performance before both brushed motors died Fully submerged Have now a 40A ESC and a Brushless innrunner on with bronze bearings substituting the ballraces, no pool time yet This has been proven in tap water , dont know...
  7. NX687

    Submerged Motor

    And what do you mean computer fan , this is an evil big , nuclear sub 700 mm long , about 2.5 kg , it needs power to push that blunt nose
  8. NX687

    Submerged Motor

    Thanks mike I am going Brushless , my question is will the speed controller be OK with its 3 wire in the water The water resistance wont confuse it ? and the back EMF for the motor timing wont get thrown out?, I hope not Subs for a kids charity have a go meet
  9. NX687

    Submerged Motor

    We all know brushed motors in fuel tanks last 1000 's of hours Why then with my brushed motor in my Radio Sub is the brush life about 5 minutes , Chlorinated pool water ,,, low power Suggestions appreciated
  10. NX687

    Bolt Lube Rcommendation

    Have an 18 bolt flange heated to 200 C Taken apart often would silver plated 5/16 UNF be better than Grade 12.9 Cap screws with hi temp lube ???? Thanks
  11. NX687

    Collins sub generator failure

    Well I learned that you separate the phase wires coming out of the core, if you sort of bundle them they can get hot there,, also vacuum impreg has no place in air cooled model engines as you want the windings open to air cooling not suffocated with epoxy
  12. NX687

    Collins sub generator failure

    Ron To my reading it was how the aussies bundled the wires out of the generator that got an overheat in this area also they did the vacuum impreg of the windings which was not quite right as I heard , also , gee they should build a few high power model plane electic motors to learn a few things...
  13. NX687

    Electron Beam Weld SS to Ta

    Tbuelna Thanks by CTE do you mean matl expansion difference You know that SS is joined to Aluminium oxide for high vacuum and up to 250 Centigrade temperature application, That type of strain relief method would work In that case a braze matl is used , I wish to join the Ta to SS...
  14. NX687

    Collins sub generator failure

    Has this failure been discussed here , wondering
  15. NX687

    Electron Beam Weld SS to Ta

    Yes , vastly different melting temps These work in Ultra high vacuum and 1000C What Im doing is joining SS to tantalum pretty well , It must be a braze In 20% of parts I get cracking and the SS, just a does not join to the Ta , I dont know why Its not a metallurgy problem , just a...
  16. NX687

    EB weld ss to tantalum

    Thanks I will look up Diffusion welding I can arrange temp, pressure and vacuum here
  17. NX687

    Is 316SS commercial requirement require UT test ?

    Denlow Its probably more correct to say that 316 is non magnetic only after annealing 316 in my hand now has an Eclipse magnet 25 Dia x27 long hanging upside down on it I also have a 316 conflat flange,that does the same
  18. NX687

    Electron Beam Weld SS to Ta

    I did post in Welding , but here might be better Im trying to get 316 SS to take or braze or glue to Ta it seems to work in most cases is there a matl I can use as a filler to enhance the bond I have used tantalum in the moly to moly bond and found that was good
  19. NX687

    EB weld ss to tantalum

    Yes , thanks Similar sections , will try and get a picture But I read that actually melting SS and Ta together makes a very weak matl so you either use a filler type braze or if not I sort of try and flow the molten SS over clean Ta and amazingly it glues tight , mostly, hope hope...
  20. NX687

    EB weld ss to tantalum

    I mean is it actually possible to do what Im doing getting 316 to braze,,, weld,,, ,,seal,,,to Tantalum for an Ultra high vacuum seal at approx 1000C operation These parts are in service working , but I dont undersand if Im brazing SS to Ta or welding to it No brazing matl is used at all...

Part and Inventory Search

Back
Top