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  1. #31
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    Wow - I picked up about 30 NOS HSS blades for it for like $60. Might last me then ....

  2. #32
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default Solved

    Steve, Shed, Gavin, and all who offered advice: we're finally there - it is working now, and very well to boot.

    I made this 'cap' for the valve thingo. Yes, I made it badly, but it was an experiment, so I wasn't exactly caring about accuracy with the dremel. It is a simple cap with a through hole and four slits.

    IMG_20190616_105804.jpg

    A ball bearing went into the thingo and the above was glued (red locktite) to the top - slits down into the thingo.

    When cured-ish I gave it a go with ISO 68 hydraulic oil (being careful to make sure I had no air in the system) and it worked a treat. After lifting the ram it lowers slowly - much faster than Steve's 5mins per 100mm, but very usable. The return stroke lift is probably about an inch at the end of the ram.

    I guess with the ISO 68 being reasonable 'thin' it just find its way past the ball bearing, and also I think, past the pistons.

    It may be not very well made (being yet another experiment) but it works so it stays - as is.

    Very happy. Thanks again all.

    Greg.


    PS. As a side note - I phoned Hercus to see if they had original plans or anything. Nope. They have no plans for any old stuff like this. Lost to time and office moves over the years.

  3. #33
    Join Date
    Nov 2021
    Location
    Brisbane Qld
    Posts
    11

    Default hydraulics-

    Hey so i had mine apart today, I can confirm mine has the original brass fitting in the bottom, and it has a captured ball bearing in it, which is held in place by a small pin pressed in across the oriface to capture it, Im guessing in yours the pin has rusted away or gone walkabout somehow.. mine was still there, i just forgot to take pics of it. mine had a broken rod between the eccentric and the pump body, so today was the day i fixed it and it works like new! cheers, Levi.

    .
    Quote Originally Posted by StrayAlien View Post
    Back to the shed. Some more photos.

    I did some experimenting with it today. Back to iso68 hydraulic. When working, that should be fine - so I'm aiming to make it work nicely with that.

    The two cylinders are connected via a port. The slotted screw seems to plug it. The valve screws in from below. some more pics:

    Attachment 379833Attachment 379834Attachment 379835

    One thing I didn't notice first time around is the small hole in the little cylinder - I am assuming this is a bleed. I'll get there in a moment.

    I put a suitable ball bearing in base of the brass thingo and and reassembled. That let *no* oil back out and so, despite looking like it might get the ram lifting, would not permit raising the ram manually and letting it back down. It was pretty rock solid. On lifting the ram the ball can, of course, get sucked out, so, I suspect that is what the cross drilled hole is for - to hold some small retaining pin or something to keep the bearing from going rogue.

    Back to that bleed hole. Hmmm .. evidently, it did not bleed anything. It is not clogged. In the pic above I have inserted a small wire in it to show how far out the piston has to be for that hole to be exposed to oil. When all fitted back into machine, even with that piston at it's most extended, and using all available adjustment, that hole will still be covered by the piston and thus, will not bleed. In other words, in operation, the piston cannot come out far enough to expose the oil to the bleed hole. Hmmmmm .....

    So, I thought I had it there for a moment, the ball bearing thing with retainer pin seems it might be correct ... but the bleed hole thing still leaves an oily conundrum.

    All comments welcome.

    Greg.

  4. #34
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    No pics! Gutted!

    But, okay. Sounds like I was on the right track. Well done for getting yours operational.

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