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Thread: Clamp setup
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13th Dec 2021, 04:02 PM #1Senior Member
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13th Dec 2021, 05:05 PM #2Most Valued Member
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The clamp on the right has more down force than the one on the left, which looks almost parallel, pretty dodgy.TTP.
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13th Dec 2021, 06:30 PM #3Member
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For a one off it worked and that is all that matters.
Robert
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13th Dec 2021, 09:16 PM #4China
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Not being a metal machining expert, why is it dodgy
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13th Dec 2021, 09:29 PM #5
Hi Bob,
Its only a line contact across the bottom of the tube and vise base and the same inside the tube ! Plus any squash from the vise jaws.Best Regards:
Baron J.
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13th Dec 2021, 09:46 PM #6
My read is that user is drilling multiple holes, doesn't want the vise jaws deforming the tube so has it set to confine the tube rather than grip it tightly, and uses the bar and clamps as a holddown so the tube does not climb the bit during drilling or grab and pull out of the vice when extracting the drill from the tube.
Overall would be slower to setup and position perfectly for each part, but for a one off or short run, could be practical when time taken to correct tube and redo surface finish from other approaches is taken into account. I've used more 'dodgy' approaches in the past for short runs where the the surface finish and shape of a cross section are equally as important as the placement of the holes.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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14th Dec 2021, 07:26 AM #7Philomath in training
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It's perhaps not ideal but does the job - I would not regard it as dodgy. It's hard to say without seeing how tight every thing is, but all the clamping + vice has to do is stop the part rotating (no side forces involved). It does that.
For that drilling operation, the vice probably would have been sufficient. If the idea was to avoid tube squash then I would have clamped direct to the T slots (that is, use the T slot as a locating groove for the tube) using the pipe through the middle.
Michael
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14th Dec 2021, 10:47 PM #8Senior Member
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I'm making one of these : https://www.hobby-machinist.com/thre...-prints.33616/
Most use brass I think but not so easy to get and too expensive in Australia so aluminium will do. Then the damn drawing is in inches so have to convert a lot of it to what ever I have in the shed for bits to make it. Whatever spring I've got, whatever O-ring I've got etc.. hmmm lot of fun, sort of.
The setup is to drill the 2 holes and face slightly larger from one hole to the other so that the nuts can seal against a flat area.
The vice clamps with light pressure only just to confine the tube as malb said. But then to hold it down I used a piece of 32mm solid bar (heavy) under those clamps.
The clamps are not tight either, just nipped up so to speak as I didn't want to mark the aluminium. I just made sure they both had around the same amount of pressure on each and that they were level so they pulled straight down.
The holes were drilled with an end mill so hopefully it wouldn't pull up when it breaks through.
I took it really slowly but the job turned out fine, anything could have happened and often does but I got away with it this time. Lol
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14th Dec 2021, 10:57 PM #9Senior Member
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Basically because the clamping is only a single point contact. A round item like this should be mounted in something like a V block (2 point contact).
Also because it's a tube it can flex a lot too, which might allow the drill to bite and rip the tube out of the vice and throw it straight at my head and then there would be blood and guts all over my mill table.
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16th Dec 2021, 09:35 PM #10I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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17th Dec 2021, 09:22 PM #11Senior Member
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17th Dec 2021, 11:01 PM #12Most Valued Member
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And the verdict?
Was it worth the effort of making?
Steve
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19th Dec 2021, 12:20 AM #13Senior Member
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Well .......... I don't know really. Probably not, considering you can buy something similar. Then again it was worth it just for having a project to work on, and it's a very good project.
It works really well. Pumps a small quantity so it's good as a precision oiler sort of.
I filled it with Mobil 1 in case I want to make something really slippery.
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19th Dec 2021, 09:55 AM #14Most Valued Member
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IMO If it’s a good project and it works really well it’s worth making!!
Steve
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