Free 186 More Best Homemade Tools eBook:  
Get tool plans

User Tag List

Results 1 to 1 of 1

Thread: Measuring female tapers

  1. #1
    Supporting Member mklotz's Avatar
    Join Date
    Aug 2015
    Location
    LA, CA, USA
    Posts
    3,515
    Thanks
    362
    Thanked 6,548 Times in 2,156 Posts

    mklotz's Tools

    Measuring female tapers

    A traditional method for measuring a female taper has been to use two gage balls of appropriate diameters. Insert the smaller into the taper and measure its depth below the taper mouth. Repeat with a larger ball. Knowing the ball diameters and the derived separation between their centers, calculating the taper is simple...


    or use the FTAPER program from my site.

    Most hobbyists probably won't have a set of ball gages; they're expensive and only infrequently used. Thankfully, there's a simpler, slightly less accurate way to make the measurement.

    Machine the end of a suitably-sized rod (I prefer brass so as not to mar the taper walls) to a diameter (d2) that will fit into the taper near the mouth. Measure this diameter carefully with a micrometer and note the value. Insert the rod until it contacts the bore and measure how far it has penetrated (h2). Some means of holding the rod parallel to the bore of the taper will be needed while the depth measurement is made.

    Now, turn down the d2 diameter a bit to a value (d1) and repeat the above to establish the depth h1.

    The half angle of the taper is then given by...

    taper half angle = arctan[ 0.5 * (d2 - d1) / |h2 - h1| ]

    where the vertical bars, "|", denote absolute value.

    186 More Best Homemade Tools eBook
    ---
    Regards, Marv

    Experience is always far worse than pessimism

  2. The Following 3 Users Say Thank You to mklotz For This Useful Post:

    Canobi (Sep 13, 2017), Frank S (Sep 13, 2017), Seedtick (Sep 13, 2017)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •