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  1. #46
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    Hi Bob

    It sounds like a case of one step forward and one back with the workheads. Does yours take a drive pulley? I like the adaptors to take square lathe tooling, something that I am going to have to think about.

    Thinking about using a chuck on the workhead brings me back to one of those little dilemmas which I have never resolved. When I bought the Centec it came with this dividing head, a 6" backing plate that matches the thread and a new 100mm Chinese chuck, this chuck looks and fells quite good but I have no way of really knowing how much runout it has. The backing plate also matches the thread that is on the Hercus workhead. The spindle thread on my Lantaine lathe is however quite a lot bigger.

    IMG_0319.jpg

    I think that there would be value in being able to move a job, in a chuck between the machines. There seem to me to be a couple of ways of getting to this point.

    1 Make a adaptor to fit the Lantaine spindle and the Hercus backing plate and use this to machine the backing plate to fit the 3jaw chuck that I have. At this point I begin to wonder how good a generic Chinese 3 jaw chuck is and whether I would be better with a small 4 jaw? The 4 jaw from the Lantaine is too big for the dividing head.

    2. Make two adaptors to fit the spindles of the dividing head and the Hercus workhead to bring them up to the size of the Lantaine spindle. I could then use a Lantaine backing plate to mount the small 3 jaw and or get a small 4 jaw. The 4 jaw from the Lantaine is too big for the dividing head.

    I am fortunate in having several Lantaine backing plates as the previous owner used the lathe to do brake work and made a number of fixtures onto backing plates.


    Regards

    Ian



    IMG_0319.jpg

  2. #47
    Join Date
    Jul 2014
    Location
    Alphen aan den Rijn, Netherlands
    Posts
    188

    Default

    Quote Originally Posted by TheNutter View Post
    Hi Bob

    "Snip"
    I like the adaptors to take square lathe tooling, something that I am going to have to think about.
    "Snip"
    Hello Ian,
    I am following your thread with interest, but since I have no Hercus grinder (I live on the wrong continent for that) I had nothing to contribute.
    I might have a idea for mounting square tooling in round collets or the like (not my idea, picked it up somewhere). Imagine 4 square pieces of stock about the length of a collet. Mill one corner off the length of each. Assemble in a square with the corners facing each other. Now you have a square hole in the middle. Mount in four jaw chuck and turn the outside to size for a collet. And voila, a set of round to square adapters.
    Quite possible there is a better design or way to make them, but I hope you get the idea.

    Peter

  3. #48
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    65
    Posts
    5,924

    Default

    Hi Ian,

    If the lathe's spindle has a 3 Morse bore this might be another option. Turn up either a screw nosed arbor or an arbor with an integral back plate and use it to mount your chuck in the lathe and work head. The chuck on the left came with the grinder. The screwed arbor was supplied to fit the Hercus milling slide's indexing attachment. They are 4 inch chucks.

    DSC_4577 (Large).jpg DSC_4578 (Large).jpg DSC_4579 (Large).jpg

    Bob.

    PS . There is a drive pulley that fits the workhead - http://www.woodworkforums.com/attach...6&d=1384007470
    Last edited by Anorak Bob; 19th Jun 2015 at 08:00 PM. Reason: PS added

  4. #49
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

    Default

    Hi Peter

    Great to hear from the Netherlands! Thanks for the the suggestion, I will keep it in mind but I think that it will be some time before I get to make this up. Doing this machine has rather caused the other projects to back up...

    Hi Bob

    That arbor is very impressive. Unfortunately the lathe has a really odd spindle , they call it a 4 1/2 mt in the manual, this means that 35mm can me run through the spindle. It comes with an 2 mt adaptor and I have put a collet chuck in this at times. I guess it would be possible to make a 4 1/2 to 3 adaptor using the existing 4 1/2 to 2 adaptor to set the outer taper but it would be a very big challenge at my skill level. One to think about for the future.

    Regards

    Ian

  5. #50
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    65
    Posts
    5,924

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    Hi Ian,

    Could you just make a 4 1/2 arbor with a 1 1/2" x 8 threaded nose? A correspondingly threaded small 4 jaw could then move from the Lantaine to the Centec or Hercus.

    Bob.

  6. #51
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    3,675

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    Hi Ian,

    I'm really impressed with how well you have cleaned up this t&c grinder. It's a lovely piece of work.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  7. #52
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    Thanks Bob, that sounds much more achievable. I will put that one on the (presently rather long) list!

    Thanks Simon, it has been a fun project. I was very lucky to score the machine and to find that under that dirt it was completely sound has been an incredible bonus. Every time I look at I can see another role for it so I am really pleased to have it. The help and encouragement that I have had from this forum, particularly from Bob, has been invaluable.

    Regards

    Ian

  8. #53
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    65
    Posts
    5,924

    Default Peter Fou's Workhead Tool Holders

    I said to Ian I would provide a few photos of the holders Peter made for the workhead. These fit the spindle's one inch bore section. The 5/8" bored holder turns out to be a convenient size. I have a small collection of Hardinge sleeves that will fit. The spindle has a pair of 180 degree opposed locking grubscrews. The 5/8" bored holder has an oversize hole to facilitate the clamping of the internal sleeve.

    BT
    Attached Images Attached Images

  9. #54
    Join Date
    Jun 2012
    Location
    ex Perth, now Mittagong
    Posts
    72

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    Bob,

    You no doubt have worked out that the square collet can take any sized piece of square or rectangular steel up to the maximum dimensions of the hole. Packing pieces can be used if necessary. Very handy for making !/8" for slotting tooling etc.

    Peter

  10. #55
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    Thanks Bob and Peter, They are most impressive and would clearly do a great job of grinding HSS lathe and shaper bits. The 'to do list' is growing exponentially.

    Regards

    Ian

  11. #56
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    I made a start on making up the missing parts.

    IMG_0323.jpg

    From L-R the pin to hold the guards for the grinding wheel, the thumbscrew for the Y axis dial, a retaining bracket for the LH end of the bed and 2 long and 2 short t bolts. The other (Z) thumbscrew is notched for grip and as I presently don't have a knurler I thought the I would reproduce this, I was quite pleased with the outcome but I bet Hercus didn't do theirs with a hacksaw! The genuine t bolts appear to have been machined from 1' sq bar, I didn't have any and the thought of doing this with HSS tooling filled me with horror so I fabricated them from some 3/8" bolts and plate.

    IMG_0322.jpg

    This is one welded and one awaiting some attention form the MIG, i have held the shafts in a little 3 jaw chuck to make sure that the plate and the shaft are square in all planes. I need 2 and made up 4 on the principle that if I have a spare they won't disappear into the black hole in my shed into which I loose things. They may not be perfectly centered but they are a lot better than the camera has made them look, either that or I need to get new glasses!

    Next is the arbor spanner.

    I have ordered a diamond dresser for the wheels and when it arrives I will make up the fixture to hold it.

    Bob - I think that the dresser and fixture is photo 17 in your post

    http://www.woodworkforums.com/showth...30#post1715330s

    Would it be possible to put up a few dimensions for the fixture? In particular the height of the two columns and the height and angle of the dresser when it is installed in the taller column.

    Thanks

    Ian

    IMG_0323.jpgIMG_0322.jpg

  12. #57
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    65
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    5,924

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    Very productive Ian. Well done.

    I will knock up a rough drawing for you of the dresser bracket along with the workhead pulley. I imagine there will be a difference between the earlier and later workhead pulley's bore diameter though.

    Do you have the drive pulley for the internal spindle?

    Bob.

  13. #58
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    Thanks Bob! I have the workhead pulley, it's the internal grinding drive pulley that I am missing. I am eyeing off a couple of sources of material to make it and presently a cast iron trolley wheel is the favorite over a small barbell weight left behind by my son.

    Regards

    Ian

  14. #59
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    65
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    5,924

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    Quote Originally Posted by TheNutter View Post
    Thanks Bob! I have the workhead pulley.............
    Regards

    Ian
    Had I opened my eyes!

    IMG_0313.jpg

  15. #60
    Join Date
    Feb 2012
    Location
    Willunga
    Posts
    103

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    My version of the pin spanner. This is made from my scrap bin, the head is a piece of black MS which is welded to a piece of ground shaft. The two studs are made from 6mm HT bolts. I struggled to get a decent finish onto the MS.

    Regards

    Ian


    IMG_0324.jpg

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