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Dumb Threading Question...

Discussion in 'General Discussion' started by Lew_Merrick, Sep 4, 2020.

  1. Lew_Merrick

    Lew_Merrick Alibre Super User

    Hi all -- I am trying to create a mm "BOOLEAN Tarpazoidal Thread" set ala the "inch ACME" set I created several years ago. My "thinking" (such as it is) is that having the appropriate geometry within the Model makes "problems" in the shop less likely to occur. Now that the United States of America is running away from having "standards" as quickly as we can, finding accurate information on such things is growing in difficulty. I have what is reputed to be data on the following Trapazoidal Threads. Is this the limit of such designations and does anybody have better or more current data on such things?

    ISO-2901 8X1.5 Trapazoidal Thread
    ISO-2901 10X1.5 Trapazoidal Thread
    ISO-2901 10X2.0 Trapazoidal Thread
    ISO-2901 12X2.0 Trapazoidal Thread
    ISO-2901 12X3.0 Trapazoidal Thread
    ISO-2901 16X2.0 Trapazoidal Thread
    ISO-2901 16X4.0 Trapazoidal Thread
    ISO-2901 20X2.0 Trapazoidal Thread
    ISO-2901 20X4.0 Trapazoidal Thread
    ISO-2901 24X3.0 Trapazoidal Thread
    ISO-2901 24X5.0 Trapazoidal Thread

    Irrational minds want to know! -- Lew
  2. GIOV

    GIOV Alibre Super User

  3. Lew_Merrick

    Lew_Merrick Alibre Super User

  4. DavidJ

    DavidJ Alibre Super User Staff Member

    Lew - designations are covered by ISO 2903:2016, section 12.

    Single start External thread Tr 40 x 7 - 7e Internal Thread Tr 40 x 7 - 7H

    Addition of an L ( Tr 40 x 7 - 7H - L ) indicates Long length group of thread engagement , absence of the L indicates Normal length group

    Multi-start threads - e.g. 2 start become Tr 40 x 14P7 - 7e

    Left Hand threads gain LH on the end Tr 40 x 7 - 7e - LH
  5. Lew_Merrick

    Lew_Merrick Alibre Super User

    Hi David -- Yes, such information is in the reference Giov linked me to. -- Lew

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