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  1. #46
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    Quote Originally Posted by Stustoys View Post

    "bolts" can be used in sheer but becomes a designed joint. With the threaded section removed from the sheer interface. So it really becomes a pin with a thread on the end.
    Is this where the term "fitted bolt" comes from or is this a different animal all together?

    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.

  2. #47
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    Shoulder bolt looks like what I'm thinking of.(couldn't find many pictures of fitted bolts, but the ones I found were pretty much the same).
    The problem is by making useful in sheer they aren't going to be nearly as good in tension.

    Stuart

  3. #48
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    The cylinders of steam locomotives are held on with fitted bolts.
    The thread is machined with the normal clearance and the shank is machined to tolerance for the reamed holes in the cylinder and the side frames of the locomotive.
    The bolts are quite often still shiney when they are removed years later indicating the closeness of the fit.

    Phil

  4. #49
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    Quote Originally Posted by Steamwhisperer View Post
    The cylinders of steam locomotives are held on with fitted bolts.
    The thread is machined with the normal clearance and the shank is machined to tolerance for the reamed holes in the cylinder and the side frames of the locomotive.
    The bolts are quite often still shiney when they are removed years later indicating the closeness of the fit.

    Phil
    Hi Phil,

    That would take quite a bit of lining up to achieve that without them seizing or binding. I'm going to "cheat" when it comes to drilling, tapping and boring the dowel pin holes. I'll do it with both the parts clamped on top of each other!

    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.

  5. #50
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    Quote Originally Posted by simonl View Post
    I'm going to "cheat" when it comes to drilling, tapping and boring the dowel pin holes. I'll do it with both the parts clamped on top of each other.
    Actually Simon, that's how it it is sometimes done with dowels if you are looking for a fit that will hold an exact location - bolt the parts up and drill through. (Sometimes one side is predrilled to make it easier to drill in-situ.). If you are spot on accurate you could drill both sides of your dowel holes and then assemble but the degree of difficulty goes up considerably if you have more than one dowel and/ or only a little clearance on the bolts.

    Michael

  6. #51
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    The plates that will ultimately be doweled and bolted to the end plates will be positioned first, without the bottom beam attached. I'm hoping that it will then be a matter of sitting the top plate in place and lining it up, clamping, tacking and then removal for stitch welding. I'll make up a leaf hinge pin that is turned to a point and one end, then mill 3/4 off it. This will leave a flat in both dimensions of the axis to line up the edge of the beam.

    Thats the grand plan anyway.

    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
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    Just had a think about what I said above. It does not make sense! I don't need to turn a point, just mill it half way so it's half round for about 15mm. I can then place it in the hinge, turn the flat so it's facing the rear. This will set the front/back position of the beam. Then rotate so the flat faces upwards, then this will set the height of the beam. Clamp and tac in place. That should get me to within the required tolerance (say 5 - 10 thou) for such a part.

    What could possibly go wrong!?

    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.

  8. #53
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    Unmentioned in another thread, Simon and I have now acquired all the materials to go ahead with our two builds. Picked up the last required steel plates from the guy who cut them for us. All looking good.



    Cheers,
    Joe
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  9. #54
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    Hey Joe, that's very nicely cut. I had no idea you could oxy that cleanly.

    I better pull my finger out, finish my poor man's DRO and get back into!
    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.

  10. #55
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    Quote Originally Posted by simonl View Post
    Hey Joe, that's very nicely cut. I had no idea you could oxy that cleanly.

    I better pull my finger out, finish my poor man's DRO and get back into!
    You can see what I was saying earlier. Oxy can be a very surgical process and Once you start talking 20mm thicknesses it rivals and actually surpasses plasma.
    Glad you got it all sorted in the end.

  11. #56
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    Quote Originally Posted by simonl View Post
    Hey Joe, that's very nicely cut. I had no idea you could oxy that cleanly.
    Just to clarify the oxy cutting process a bit- The photo shown is that of a mechanically guided oxy cut as per a straight line cutter or profile machine.

    I can hand cut as straight but not as smooth as the surface finish as produced by a machine.

    Grahame

  12. #57
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    Hi all, progress on my sheet metal folder has been slow but steady. I should be ready for some updated photos soon. One question that I have been meaning to ask, wrt the lubrication, I will need to create several lubrication points for all the bushes in the pivoting sections. I am yet to do any of these, as I figure it will be one of the last jobs but I wondering whether they should be oil or grease lubricated. With the infrequent use and the small range of movement, I figure ANY lubrication will do the job. I notice that most folders these days seem to have grease nipples. I Was hoping that a small hole for an oil point, along with either a countersink or a larger drill bit for maybe 5mm deep to produce a reservoir for oil. Will this do the job? Cheers, 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.

  13. #58
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    Mine has oil holes - around 4 or 5mm from memory. Like you I've seen them with grease nipples. Grease will hang around longer but as you have observed, any is better than none.

    Michael

  14. #59
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    Simon from memory (14 yrs ago) I remember that oil holes was all that mine had, countersunk and 4mm holes.
    Are you making it with a solid blade or with fingers (pan folder). As a suggestion, while you are still in the fabrication stage you might want to put a couple of pivot points ready for hydraulics at a later stage, it's easier to do now rather than later.
    Kryn

  15. #60
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    Quote Originally Posted by KBs PensNmore View Post
    As a suggestion, while you are still in the fabrication stage you might want to put a couple of pivot points ready for hydraulics at a later stage, it's easier to do now rather than later.
    Kryn
    Mate, you're killing me!

    Seriously though, it's only a 1230mm sheet folder so I don't really see a future for it with hydraulics. I figure if I don't have the physical strength to lift the leaf by hand, then I'm probably asking too much from it anyway. I will however, have fingers. Mostly they will be 75mm wide but I may make some 25mm wide as well. I think I only have enough material to make about 1000mm of fingers but I can make more as required if I need the width. They are pretty easy to make.

    Thanks Michael & Kryn, I'm thinking oil will be fine too.

    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.

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