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  1. #691
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    I have managed to educate myself on how this drove system works... Sort of...

    Yes and it is quite inefficient and sucks up power...

    There is a 3 phase electric motor that is connected to a DC generator that generates between 240 and 290 volts DC power.. (mine seems to generate 290V)

    Then connected on top of this driven by a V belt is another DC generator that generates 115V DC.

    On the spindle drive side we have a DC motor.. This is connected to a control panel with a few relays and resistors and other things in there..

    We also have two large potentiometers connected via a common shaft to the speed adjustment knob via a sprocket and chain..

    THe system works like this...

    At low speeds the field coils on the DC motor get fed 115V, the armature gets fed a low voltage at slow speeds, as you build up speed to the DC motor's normal maximum speed you end up feeding 290V into the armature and still 115V into the field windings. This is about half way on the speed adjustment knob...

    Once you go beyond that the field voltage is reduced further and further as you turn the knob, allowing the motor to continue speeding up, up to maximum speed...

    The lathe also has a brake resistor coil, so when you hit neutral from a high speed, a relay will click in which I assume dumps the generated power (as the motor would now be a generator) through the resistor bank.. Also another relay clicks in (which is currently not working on this lathe as the relay coil is broken but I have another one sussed out) which feeds 115V into the field coils to further slow the motor...

    There is also another system in there that if you go from forward to reverse, the main direction contactors will not engage until the motor is spinning at a slow speed, you can see that in the video...

    Here is the video... 10EE testing - YouTube
    Last edited by .RC.; 20th Apr 2013 at 01:53 PM. Reason: speeling
    Gold, the colour of choice for the discerning person.

  2. #692
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    5,080

    Default

    Hi .RC.

    Looks pretty smooth, I like the motor generator dc drive system, very clever and solves a lot of control problems.

    Just watching the video, I get the impression the tacho doesn't read in reverse? Or am I not seeing that correctly?

    Here's a test for embedding youtube video... I wonder why sometimes it's just a link and sometimes you get a preview window..




    Ok, if you use the little film strip icon next to the insert picture icon it puts VIDEO tags either side.

    Regards
    Ray

  3. #693
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,088

    Default

    So it would be safe to say you'd never leave it on by misstake unless there happned to be a jet taking off nearby . Though I guess the doors will quieten it down some?

    So would it be correct to say that at at least some speeds the control is by varying opposing forces?

    Question. What happens if the vee belt between the 290V gen and the 115V gen fails?
    (I think there may be three or more answers to this)
    Stuart

  4. #694
    Dave J Guest

    Default

    Nice lathe RC, good to see it's going to a good home where it will be cared for.
    At that price it was only just above scrap value, the guy didn't know what he had.

    Dave

  5. #695
    Join Date
    Oct 2007
    Location
    Sydney
    Posts
    3,112

    Default

    Richard is yours the 4000 rpm model? It seems to be fair hiking!!!

  6. #696
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    No only a 2500rpm, and at the moment only 2300rpm at that....

    AFAIK the 4000 (and they made some 5000rpm) were all square dial models so from 1944/45 onwards... Although there was no difference in the spindle bearings between the 2500 and 4000 rpm models, only difference was a different lubrication system...
    Gold, the colour of choice for the discerning person.

  7. #697
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    HI,
    Very Nice RC, am I wrong in believing that these are a Variable Speed Lathe ?.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  8. #698
    Join Date
    Oct 2007
    Location
    Sydney
    Posts
    3,112

    Default

    Ok it looked to be going faster in the video. 2500 is more than fast enough anyway ... unless you enjoy turning sewing needles in collets!

  9. #699
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    sino.jpgsino 2.jpgHI,
    Okay Time for Me to have a Tool Gloat. Yesterday I Won a Brand New Sino SDS6-3V DRO with Scales on Ebay for $350.00 Delivered. I haven't received it yet as I only just Paid for it. It sounds like that there not the best DRO Brand, but it will do for My DM45 Mill Drill and the Price was good. I will Post some Pics after I install it.
    Last edited by steran50; 20th Apr 2013 at 07:34 PM. Reason: forgot preliminary pics
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  10. #700
    Dave J Guest

    Default

    Hi Stuart,
    How did you win that, they are usually buy it now or was it a private sale?
    I am asking as I am just about to buy another one to replace the Meister XPOS3 piece of crap that stopped working and he want $390 for the parts to fix it, what a joke.

    Sino are a great DRO, I have the same one on my mill. They do lathe, 2 mills, grinder, etc all in one readout, so you can switch over to lathe mode to set up tapers in the mill.


    You did really well and I am sure you will be more than happy with it.

    I am in contact with a guy who sells a 5 axis DRO, I will see what comes of it.

    Dave

  11. #701
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

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    Sino are good DRO's.. At least the one on my lathe is, I often can work to within 0.01mm with it...

    Well done...
    Gold, the colour of choice for the discerning person.

  12. #702
    Join Date
    Sep 2006
    Location
    Mallacoota,VIC,Australia
    Age
    53
    Posts
    1,010

    Default

    HI,
    How did I Win that, well I spotted it My eBay 'Saved Search' - Inspection, Measurement. The Starting Price was 99 cents and there was No Buy It Now so it was Auction only. I actually had to Email the Seller twice to get a Freight Cost as I didn't get a Reply from the first question. The Seller was titan_machine AKA Titan Machinery.
    This is the second time I have done well with Him, early last Year I Won an Auction on Ebay for a Brand new Taper Turning Attachment the same as the Hafco one for just under $296.00 Delivered. I still haven't got around to using it though.
    So Sino are a good DRO then, I must have been reading the wrong ones. I won't know till I get how I am going to go with the Scales. The 720mm and 320mm should be quite usable, but the 420mm I think might be just to short for the Rise & Fall of the Mill Drill Head- unless I limit the Travel. I am going to ask the Member that just Posted the Pics of His DRO Installation on a Mill Drill as to what Scales He used.
    Wow 5 Axis Dave that would be reallly good on a Mill. I can see how four Axis would work X & Y for the Table, Z Axis for the Rise and fall of the Table. Another Axis (4) for the Quill, but I can't think what You would use the 5th Axis for.
    All The Best steran50 Stewart

    The shortest way to do many things is to do only one thing at once.

  13. #703
    Dave J Guest

    Default

    I am really glad you got it, I have just never seen a new DRO go for bidding and go that cheap. Like I said in another thread I have been staying off ebay so I don't buy stuff, LOL.
    When I said how did you win that, it was not meant to be a question I was just I was amazed you got it for that price, but now I see it was with set length scales so you needed a machine to fit them. Still a great score for your machine though.

    The Sino are up there with the others like Easson in my eyes. Even if you have to limit the travel it wont hurt, another scale is going to put you in the price range of the others where you can pick your scales.
    I have bought off him a few times and he seems OK.

    I just bought a taper attachment myself for $300 and it looks like it will fit perfectly other than the clamp, but I will see. Mine is the type where you have a telescopic screw so no dismantling anything to use it, though I will have to make the screw.
    I cleaned it up yesterday and it came up great, it was a bit of a gamble with the limited description on ebay, but it looks to be really well made along tapered gibs etc and will fit my lathe.

    Dave
    Attached Images Attached Images

  14. #704
    Join Date
    Aug 2008
    Location
    Adelaide
    Age
    68
    Posts
    1,373

    Default Linisher / Wife gloat

    OK - So my wife and I celebrated our 30th anniversary this month with a trip to Victoria (Sovreign Hill & Halls Gap). Whilst there a side trip to Hare and Forbes was in order to pick up my present from her. My new linisher with 60" x 4" belts.

    Linisher.jpg

    Still happily married after 30 years and 2 grown up kids who've finally left home, encourages me to keep racing and buys me machinery for our anniversary - I reckon I made the right decision all those years ago.....

  15. #705
    Dave J Guest

    Default

    Nice linisher Gavin, yeah she is a keeper, LOL

    Dave

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