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Type: Posts; User: Zathras

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  1. Replies
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    Re: Slewing bearings (Cheaper alternatives?)

    Distributor? Uh no.... they are based in China.
    They would probably be good enough for most applications though.
    The used crossed roller bearings on eBay were more expensive than new ones Rigia...
  2. Replies
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    Re: Slewing bearings (Cheaper alternatives?)

    Certainly plenty on Alibaba but that is a huge risk with scammers.

    This is one of the places I found that produce Jap clone bearings and seemed happy to quote me;
    IKO CRBF crossed roller bearing...
  3. Replies
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    Re: Constant Force Pneumatics?

    I think this is what I need...

    Pneumatic Counterbalance | NGT Valves

    http://ngtvalves.com/pdf/0.5-0.75-nptf-pneumatic-counterbalance-valves.pdf


    OR maybe this?...

    Electronic Proportional...
  4. Replies
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    Re: Constant Force Pneumatics?

    Well, the answer from jeffserv doesn't explain how the regulators would work for double acting cylinder. I suppose just leave one open?

    So I hope I can make it clearer what I mean;
    I need to be...
  5. Replies
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    Re: Constant Force Pneumatics?

    Aha! Thank you jeffserv for your help.:banana:

    I just wish you were wrong about the cost. Even on eBay they're expensive. I need 6 of them:(
  6. Replies
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    Constant Force Pneumatics?

    Can anyone help me?

    I have an Airpel double acting pneumatic cylinder.
    Here's what I would like to do;
    Have a mass balanced in any linear position just like a constant force spring.
    Q:
    Is...
  7. Replies
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    8,466

    Headsmess, My post about this supplier and...

    Headsmess,

    My post about this supplier and freight forwarder I used is here; http://www.cnczone.com/forums/calibration_measurement/172881-australians_need_surface_plate_without_ripped.html

    ...
  8. Replies
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    8,466

    FWIW, I completely gave up on all these...

    FWIW, I completely gave up on all these alternatives to making a (large) surface plate. I took the risk and found a Chinese manufacturer and imported it through a freight forwarder. I posted my...
  9. Ian, 3000mm is large alright! I'm now...

    Ian,


    3000mm is large alright!
    I'm now going to say some stuff you don't want to hear;

    Of course it depends on your application but I personally would not recommend countertop Granite at...
  10. Any Australians need Surface Plate without being ripped off?

    Some time ago I required a large surface plate and tried some ideas with Epoxy granite and glass as an alternative. I came to the conclusion there was no way these could be a decent substitute for my...
  11. Replies
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    324

    Trying to make a poor man's HPC based machine...

    Trying to make a poor man's HPC based machine base.
    Plan:
    1. Have some Polypropylene fibres (forced to buy this from UK) to reduce shrinkage and cracking. No rebar required.
    2. Sika Control 40...
  12. Replies
    2
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    324

    Australian Supplier of Superplasticizer

    Aussies Only!

    I've had some dead ends trying to find someone willing to sell me 20lt (smallest?) pails of Concrete superplasticizer.
    Apparently, people aren't interested or expect me to chase...
  13. Replies
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    86,331

    I wouldn't use the patent either! I have thought...

    I wouldn't use the patent either! I have thought about this type of idea but had to dismiss it in the end. Even the low cost C7 Chineese ballscrews would be better than this idea IMHO.

    I think one...
  14. Replies
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    86,331

    Phil, Essentialy this is what you're talking...

    Phil,

    Essentialy this is what you're talking about.

    Patent number: 4272997
    Filing date: Aug 17, 1978
    Issue date: Jun 16, 1981

    Patent US4272997 - Drive mechanism - Google Patents
  15. Replies
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    RomanLini, True, I have no idea how much...

    RomanLini,

    True, I have no idea how much grinding costs. I did assume it would be expensive for rails that are 833mm long and mounted on a 70kg(?) 800x900mm block. Not sure if a lot of grinders...
  16. Replies
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    Come to think of it Ian, you could be right about...

    Come to think of it Ian, you could be right about the blocks I said were "new". They prob got banged up shipped to someone and then returned in that state.
    (chair)

    I will think about a charge...
  17. Replies
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    Hi Lucas, Thanks for the link to your blog. I...

    Hi Lucas,

    Thanks for the link to your blog. I too was thinking of using some of these type of inserts with the laminated wood mold for the sides.
    The problem of getting the two rails flat and...
  18. Replies
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    Ian, Thanks for your comments. The story of...

    Ian,

    Thanks for your comments.
    The story of your purchase is worrying.
    For mine, I think the packing was quite poor but not as bad as yours. My two ballscrews were wrapped up together in some...
  19. Replies
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    640

    Ballscrews from eBay Vendor - Quality??

    I'm posting this so people can judge what to expect in terms of quality from eBay vendors.
    I purchased these very recently from "linearmotionbearings2008" via eBay (but not listed) after reading...
  20. FWIW I have tried Megapoxy H from Vivacity...

    FWIW

    I have tried Megapoxy H from Vivacity Engineering and could not get anywhere near a flat surface with 3 tries although the surface looks nice. I supose I could have made a mistake but I'm...
  21. Replies
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    Bob, Thanks for the stock link in Oz. I have...

    Bob,

    Thanks for the stock link in Oz.
    I have seen the post and have considered flat stock but I thought it was too hard to scrape it like iron or bright mild steel for seating rails. Is that not...
  22. Replies
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    Inserts cast against Surface Plate?

    Love the idea of E/G homebuild but I can only see one method I'm going to get flat surfaces for my THK rails. The self-leveling Epoxy method does not yield a flat surface by any means. At least not...
  23. Replies
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    Aha! I think now I found it again, "IC-Haus"...

    Aha!

    I think now I found it again, "IC-Haus"
    Encoder products here;
    iC-Haus Homepage - keyword: Encoder iCs

    Still nothing to interface 1vpp to 20vpp but intersting ics here.
    ;)
  24. Replies
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    Thanks Al. The Kanalog also has analog inputs...

    Thanks Al.

    The Kanalog also has analog inputs with ADCs that can be used with encoders.
    It's just that the voltage range is -+ 10v not -+0.5v. I will lose too much resolution IMHO.
    The Deva...
  25. Replies
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    Analog Encoders 1Vpp to 20Vpp?

    Hi people,

    I have some Renishaw analog encoders ( RGH22A15L00 ) that have 1Vpp differential output and need to interface it with my Dynomotion KFlop+Kanalog controller board with 20Vpp...
  26. Replies
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    Guys, I'm in a similar situation to the OP. ...

    Guys,

    I'm in a similar situation to the OP.
    If anyone can help, please PM me!

    Thanks.:cool:
  27. Epoxy layer on aggregate ... useful paper?

    Cameron,

    I was just thinking about the thin epoxy layer problem of a few pages ago you talked about and came (Googling) across this related paper. I'm sure you don't have enough to read right?;)...
  28. Brian, I can't undo these bolts now to put on...

    Brian,

    I can't undo these bolts now to put on a washer. I want to prevent them from moving lose but also not permanent. No one is going to be touching them but me I hope.
    So maybe there isn't a...
  29. This time with picture..

    Brian

    Thanks but nope. Good grief I forgot to add the picture .... sorry!!:o

    Besides, I need to bolt another larger diameter plate/flange on the bearing face.

    Out of focus pic as well.........
  30. Correct Loctite for locking bolt head not thread?

    Hi guys,

    I've tried to search for the right Loctite to prevent some Hex-Head bolts from losening but have had no luck on the Loctite site(s).
    They all seem to be the Anaerobic type which is...
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