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  1. #31
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    Quote Originally Posted by cava View Post
    I am suitably impressed with this press and am considering making one. It is small, compact and moderately cheap.
    The turning of all those threads back and forth would be a bit slow and frustrating.
    A set of HD toothed wheels on each threaded rod connected by a MC chain would speed things up a bit.

    From the more knowledgeable here, if the thickness of the plate was increased to say 30-35mm, would the capacity of the press be increased? Or would it have to also include an increase in the diameter of the threaded screws? Curious minds etc...
    It would be better if the thread was bigger but what do you have in mind that needs more than 100T?

    Another thing, where would you buy thick plate in small quantities, and threaded rod from in the Melbourne area?
    Steel merchants in WA have pieces that thick in their scrap bins very occasionally.
    The other place would be at a metal scrap merchants.

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  3. #32
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    Quote Originally Posted by BobL View Post
    It would be better if the thread was bigger but what do you have in mind that needs more than 100T?
    Like most things in my life, I tend to over-engineer the things I do.

    It tends to stem from the belief, that I just may need extra capacity one day - in actuality, this is seldom. However, if it is cheap enough to build, why not go the extra mile.

  4. #33
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    Quote Originally Posted by cava View Post
    Like most things in my life, I tend to over-engineer the things I do.

    It tends to stem from the belief, that I just may need extra capacity one day - in actuality, this is seldom. However, if it is cheap enough to build, why not go the extra mile.
    No worries then - I am in your corner of the court

  5. #34
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    Apr 2008
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    Perth
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    289

    Default Small press

    Hi Bob

    I made one of them small presses back in 1987, company I worked for had an Enerpac one, I took a design off that particular model. Bought some channel, cant remember the size now, drilled holes to suit eithe size of the channel after cutting to my required length. Made the holding bits from the left over channel. I bought a 20tonne Enerpac ram and a pump to suit, had a fitter & turner machine up a threaded collar for the ram. All up with company discount on steel and Enerpac bits cost me back then just under $200. When I moved down to perth, took the enerpac bits, gave the press away.

    Eight years ago I made a little 5 tonne one for a glass blower, who wanted to use it to fracture glass plugs before putting said bits into a furnace. Worked good, cept the glass blower never bothered to use the supplied canvas bag I shipped with the press to avoid shattered glass over her workshop. Mind boggles.

    DD

  6. #35
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    I have been doing the sums on building one of the '100 ton presses', but just a little bit bigger to make it more practical.

    The high tensile threaded rods in 36 mm diameter are $44/mtr each = $88

    Eight (8) nuts at $5 each =$40

    The steel plate at 40mm x 305mm x 305mm was $238.70 for two. Which has ruled out the project as a cheapie. (I did go around to engineering companies, however it appears that they do not have 'scraps' as they purchase to exact order).

    Not sure what the machining costs would be to drill 8 holes and tap 4 holes, but assumed circa $50 - $100.
    So guys it looks as if it is not going to happen.

  7. #36
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    Quote Originally Posted by cava View Post
    I have been doing the sums on building one of the '100 ton presses', but just a little bit bigger to make it more practicle.
    The high tensile threaded rods in 36 mm diameter are $44/mtr each = $88
    Eight (8) nuts at $5 each =$40
    What about screws jack like these.
    38 mm diameter thread complete with nut, $17.50 each
    http://buybuildingsupplies.com.au/sc...d-p-26640.html

    The steel plate at 40mm x 305mm x 305mm was $238.70 for two. Which has ruled out the project as a cheapie. (I did go around to engineering companies, however it appears that they do not have 'scraps' as they purchase to exact order).
    When the miming boom was in full swing here in WA, for many months the steel merchant I go to had a constant stream of scrap discs up to 50 mm thick and 750 mm in diameter.
    I did look at purchasing a couple of 400 mm x 40 mm discs (weight was about 40kg) at $1 a kg. shoulda, woulda, coulda . . . . . price was $1/kg

    Not sure what the machining costs would be to drill 8 holes and tap 4 holes, but assumed circa $50 - $100.
    I'd probably double that at least!

  8. #37
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    Bob, I could fudge around the cost of the rods, nuts and even machining. But the steel cost floored me...

    Oh well, another day perhaps.

  9. #38
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    Happened to be at my local scrap merchants today (buying, you know, groceries etc ) and saw a lump of 20 mm plate.

    Long story short, it followed me home.

    Whilst I was originally looking for 30-40mm plate for the press, I thought that I could double weld two (2) 20mm plates together to achieve 40mm thickness. The 36mm threaded rod that I was considering is rated at 8.8.

    The questions are:
    1. Is this an option to achieve a greater press capacity in tonnes?
    2. Are the number of rod threads in the plate critical?
    3. Whats more important to increase capacity of the press - the thickness of the plate with a greater number of threads or the thickness of the high tensile threaded rod?

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