StainLess Steel MediaInline FabricationTitan ReloadingMidSouth Shooters Supply
Lee PrecisionRotoMetals2Graf & Sons

Donate Now Goal amount for this year: 6000 USD, Received: 4840 USD (81%)
We have reached our goal! Thanks to all who donated! I will be updating the donation bar in the next few days!
Our Annual server fund drive is going on now! This donation drive helps fund Cast Boolits for an entire year, and helps support our 2nd amendment rights! You can donate by Paypal by clicking the DONATE button. Or by Cash / Check / MO to the address below:

Willy Snyder
PO Box 2732
Pocatello, ID 83206
****Due to overwhelming e-mails, I will be very slow in updating this list. Please bear with me!****

Results 1 to 5 of 5

Thread: Odd micrometer question.

  1. #1
    Boolit Master beezapilot's Avatar
    Join Date
    Sep 2013
    Central Fla

    Odd micrometer question.

    I know that it is a sign of mental illness, but I'm a sucker for old orphaned tools. Picked up a Slocum micrometer with patent dates of May 12th, 1890 and April 13th 1897. On the barrel it has the standard divisions for tenths BUT under that scale there is another that breaks the inch into eight major divisions, with each of those broken into 4 divisions (1/32nd). I'm unfamiliar with anything that would use that form of division / measurement. Any sage and worldly gunsmiths / machinists that know what this was used for? Built in fractional measurements?

    Yeah.. kept playing with it... major increment X4, add the number of dividing lines for a measurement in 32nd's, easy math. Perhaps for providing measurements to those lowly carpenters who must have been tickled to get a measurement of 23/32nd's.

    Ha! Wo needs decimal equivalent charts anyway....Click image for larger version. 

Name:	scales.jpg 
Views:	18 
Size:	31.3 KB 
ID:	225010
    Last edited by beezapilot; 08-04-2018 at 01:55 PM.
    The essence of education is self reliance- T.H. White.

    Currently seeking wood carving tools, wood planes, froes, scorps, spokeshaves... etc....

  2. #2
    Boolit Master
    JSnover's Avatar
    Join Date
    Dec 2007
    Bensalem, PA
    Probably just trying to satisfy everyone. If it's made well enough it's not a bad idea, you can convert to whichever increment you like.
    I've seen a caliper with multiple scales on the dial but the entire thing was plastic.
    Warning: I know Judo. If you force me to prove it I'll shoot you.

  3. #3
    Boolit Master
    Join Date
    Mar 2010
    NC Arkansas
    At the time it was made, most machine components were made to fractional measurements.

  4. #4
    Boolit Master

    TCLouis's Avatar
    Join Date
    Mar 2005
    Middle TN
    Made for a lumber mill?
    Nothing is impossible for the person that does not have to do it.

  5. #5
    Boolit Master uscra112's Avatar
    Join Date
    Jun 2006
    Switzerland of Ohio
    Quote Originally Posted by ulav8r View Post
    At the time it was made, most machine components were made to fractional measurements.
    ulavr8r has it right. Decimal inch measurement wasn't universal in machine shops, even as late as 1914. You'll find this on 19th century patent drawings, sometimes with numbers like xxx/128th inch.

    Army procurement standards killed off fractional inch measurement for precision machinery during WW1. They also forced machinery makers into using a nationally standardized system of screw threads, for which we should be eternally grateful.
    flectere si nequeo superos, acheronta movebo

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check