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  1. #16
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
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    6,458

    Default

    It looks the part Techo.

    How will you hold the 40 arbor while machining the Wohl mount?

    Bob.

  2. #17
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Bob, after the internal 16mm drawbar thread is cut I will pull the shank back against it's 65mm diameter flat face on a faceplate. Holding the shanks for grinding after hardening will be another story.

  3. #18
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Quote Originally Posted by Techo1 View Post
    Bob, after the internal 16mm drawbar thread is cut I will pull the shank back against it's 65mm diameter flat face on a faceplate. Holding the shanks for grinding after hardening will be another story.
    The advantage of having a largish lathe!

  4. #19
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    A little more progress on the shanks, this is the setup I used to bore, drill and screw cut to ensure that the threaded hole stays concentric and straight.

    IMG_1417.JPG

  5. #20
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    The 2 shanks are ready for Carburizing, hopefully later this week.

    Shanks 1.jpg

  6. #21
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Pack Carburizing at 910 degrees C today.


    IMG_1486.JPG

  7. #22
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    They are now ready for Hardening and Tempering. I filled the threaded holes with Refractory Cement (Fire Clay) to prevent extra carbon being absorbed by the threads which could make them very brittle.


    Carburized.jpg

  8. #23
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    You did quench them after pulling them from the furnace?
    Gold, the colour of choice for the discerning person.

  9. #24
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Quote Originally Posted by .RC. View Post
    You did quench them after pulling them from the furnace?
    No, I didn't, they were allowed to cool overnight while still in the box. Today I reheated them to 860 degrees and quenched in oil to refine the core, tomorrow I will reheat to around 800 degrees and quench to refine the case. They will then be tempered.

  10. #25
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Grinding the #4MT shank.
    MT4 to Wohlhaupter.jpg

    Various stages of completion.
    Wohlhaupter Shanks - semi finished..jpg

  11. #26
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Very nice Techo!

    How are you supporting the tailstock end of the arbors, a dummy centre screwed into the drawbar thread or the tailstock's centre running off a chamfer at the entrance to the bore? I like the hose clamp "dog". One to remember.

    Bob.

  12. #27
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default

    Yes Bob,it's running between dead centres on the 60 degree chamfers machined in each end.

  13. #28
    Join Date
    Sep 2008
    Location
    Riddells Creek, Vic.
    Posts
    831

    Default Every Home machinist should have one of these.

    Attachment 370405

    xrf gun.jpg

    I was having second thoughts about the scrap yard material I used for the two Wohlhaupter shanks/arbors considering I have had it for over 20 years and the colour coding on the end of the bar is almost completely worn off.
    A bit late I know, but I decided to have it tested to confirm that it was actually EN36A, the scan results are below.

    XRF Scan.jpg

    It came up as 9310, the AISI equivalent of EN36A so all is well. It appears that the XRF does not have European standards in its data base.

  14. #29
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,943

    Default

    Unfortunately your attachment 370405 comes up with "Invalid Attachment specified. If you followed a valid link, please notify the administrator"
    Nice piece of workmanship on your shank/arbor. Thanks for the WIP report.
    That's an amazing interesting piece of equipment, as you say Every Home machinist should have one of these.
    I'll bet it wasn't cheap, or is it a work perk??
    Kryn
    To grow old is mandatory, growing up is optional.

  15. #30
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    4,049

    Default

    A quick check shows prices from $8k to $22k for secondhand on US EBay. Would be handy to know of someone with such a machine. Steel merchant or similar. Could I just check this trailer load of scrap mystery metal?

    Dean

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