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  1. #16
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    140

    Default

    Thank you Bob for all of the photos, Very helpful indeed, Sorry to hear you broke the casting, like the ball crank over the indexing plates, definitely a much better and easier way to use it, I like the way you have double indexed the dial, much easier than trying to add up 4.5 degrees each rev of the crank handle, In the gear that my uncle had there were also a couple of motor/ input gears for the mills, there were 2 different sizes so I assume again that they may be standard and high speed gear ratios or maybe the later three slot had a higher speed range and that is what they are for.

  2. #17
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    68
    Posts
    6,309

    Default A Tee Square and the Dining Table.

    IMG_20210719_142520293.jpg

    No erase button and no Liquid Paper. The 7/16 " shaft is 3.4375" in length. The length may need to be adjusted to minimise axial play in the eccentric bush and if the bush is made prior to making the shaft the shaft diameter should be made to suit the bore. The thread on the left hand worm end of the shaft is also 5/16" BSW. I think the oil nipple on my eccentric is 1/4" UNF.

  3. #18
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    140

    Default

    Thank you Bob, Very helpful as always.

  4. #19
    Join Date
    Mar 2011
    Location
    Dural NSW
    Age
    79
    Posts
    1,185

    Default Drawing with Tee Square

    Quote Originally Posted by Tinkerer77 View Post
    Thank you Bob, Very helpful as always.
    Bob
    A very nice drawing with meaningful imperial dimensions ( for me anyway)
    Yes, I still have a few Tee squares & drawing board as well as large drawing machine.
    Hardly ever use them but will not throw them out... as "they might come in handy one day"
    Bruce

  5. #20
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    62
    Posts
    4,663

    Default

    Bob,
    you might want to edit your 3/32" off set dimension, it looks like your decimal point is in the wrong place.

  6. #21
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    68
    Posts
    6,309

    Default

    Quote Originally Posted by pipeclay View Post
    Bob,
    you might want to edit your 3/32" off set dimension, it looks like your decimal point is in the wrong place.
    Well it's just as well that I added the fraction.

    Thank you Peter.

  7. #22
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    68
    Posts
    6,309

    Default

    Quote Originally Posted by Abratool View Post
    Bob
    A very nice drawing with meaningful imperial dimensions ( for me anyway)
    Yes, I still have a few Tee squares & drawing board as well as large drawing machine.
    Hardly ever use them but will not throw them out... as "they might come in handy one day"
    Bruce
    Thank you Bruce.

    Imperial dimensions because the parts were made on imperial machines.

    Bob.

  8. #23
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    71
    Posts
    451

    Default

    Quote Originally Posted by Anorak Bob View Post
    Steve,

    I'm pretty sure I would have discussed the issue of gearing of the table with Steve Durden at the time and 24 DP fits, 20 DP is too big, an 80 tooth wheel has a PCD of 4.000". The bore of the table is only 3.5"

    The dismantling came at a cost. When I reassembled the thing I was trying to position the eccentric to provide the minimum of backlash without binding. The 1/4" screw that secures the eccentric clamp tore out the cast iron . My fault because the screw should have been longer. Anyway there was sufficient material between the bottom of the threaded hole and the base to enable the drilling and tapping of a through hole and the fitting of a proper screw. Just something to be aware of.

    Attachment 393031 Attachment 393032 Attachment 393033 Attachment 393034

    I said to Steve 'Tinkerer" that I would measure and draw the eccentric and the shaft for the worm.

    BT
    Having a look through the Hercus drawings I have, 1/8 circular pitch and 24dp are fairly common adopted sizes, so seems quite probably 24dp is correct, they used that on the metric thread chasing dial gears for one.
    Mal

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