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  1. #16
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    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
    71
    Posts
    6,458

    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
    239

    Default

    Thank you Bob, Very helpful as always.

  4. #19
    Join Date
    Mar 2011
    Location
    Dural NSW
    Age
    82
    Posts
    1,203

    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
    64
    Posts
    4,887

    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
    71
    Posts
    6,458

    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
    71
    Posts
    6,458

    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
    73
    Posts
    490

    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

  9. #24
    Join Date
    Oct 2001
    Location
    ACT
    Posts
    667

    Default

    I finally got around to taking apart the mechanism on my hercus dividing head and the mechanism Bob has drawn up is basically identical - apart from being longer. Good to know.

    I also realized that the bolt that mates with/into the 0.202 width slot is used as a stop for the rotation ( I had thought it was used by the bolt to push the worm engagement into the worm wheel). The worm is 1.0625" long.

    Cheers

  10. #25
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Quote Originally Posted by Zsteve View Post
    I finally got around to taking apart the mechanism on my hercus dividing head and the mechanism Bob has drawn up is basically identical - apart from being longer. Good to know.

    I also realized that the bolt that mates with/into the 0.202 width slot is used as a stop for the rotation ( I had thought it was used by the bolt to push the worm engagement into the worm wheel). The worm is 1.0625" long.

    Cheers
    Steve,

    On the rotary table I have the 'bolt' only sets the depth of engagement between the worm and worm wheel. It does not prevent rotation unless the worm is jammed into the wheel. I use the cotters to clamp the table to prevent rotation.

    Bob.

  11. #26
    Join Date
    Oct 2001
    Location
    ACT
    Posts
    667

    Default

    Thanks Bob, that’s exactly what I mean

  12. #27
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    Default

    I have finally gotten off my butt and started work on this project again, I was just wanting to get a a few bits and pieces done so they are close to being ready when I get the rest of the bits from Michael G to assemble them. I have made one shaft and concentric bush to play around with.

    I found that after playing around with them the tables were not sitting flat on the base, there was a big radius on the table and even though there is a big chamfer on the body there still was not enough clearance for it to bottom out, I machined the radius back and made it a lot smaller and now everything is sitting nicely, it was having trouble with tight spots and when I measured the overall height they were between 2 to 3 mm higher than the base and top dimensions measured. I have also picked up a dividing head so there is at least something to compare the rest of the parts to, I am also in the process of making the handles for the worm drive.

    Lucky for me there was one body for the 3 slot table in the mix of parts.
    Attached Images Attached Images

  13. #28
    Join Date
    Oct 2001
    Location
    ACT
    Posts
    667

    Default

    Hi Steve,
    looking good

    Thats exactly what I found on mine - that the large radius didn't let the table bottom out on the base. mine didn;t need much of a clean up either. Think they would have machined it just a little more on that diameter when they made them.

    cheers

  14. #29
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    Default

    I had a bit of spare time on my hands the other day so I decided to turn up a shaft and eccentric bush for the rotary table with a handle and degree dial, I pretty much used Bob's design just made a one piece unit with a slightly different dial, saves using the dividing plates, I still need to mark up the dial but I might be able to get that engraved on the CNC at work with a bit of luck, I had a spare handle for a milling attachment that I had found in one of the machines I had purchased so that was a bonus although I had been looking at either a cross slide spindle handle or the bigger one from the attachment so I went with the latter.
    Attached Images Attached Images

  15. #30
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    Looks the part Steve, well done !!

    The additional leverage afforded by the larger ball handle won't go astray. I was tempted to replace the cross slide handle I used with a handwheel but Hercus' smallest is 3 3/4" in diameter, a touch too big.

    Bob.

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