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| Titivating a Warco Mechanical hacksaw! |
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| mattinker:
--- Quote from: Biggles on February 10, 2017, 12:09:01 PM ---Well done Matthew, but i want the mobility scooter. :drool: :lol: --- End quote --- Thanks Biggles, for the mobility scooter, you'll have to contact AdeV for that |
| awemawson:
Matthew, I vaguely looked into this about 15 !years ago - I saw a very similar Taiwanese saw in a used tool dealer, and there was a knurled knob on the end of a shaft emerging from the hole in the top plate that you used as a jig for drilling I suspect that there was a ball valve similar to yours, but with something pressing on the ball to give a controlled leak. If you think about it, if your ball valve is perfect, the blade will never descend ! The little cylinder just transfers enough oil into the bigger one to lift the blade off the cut on the return stroke, but re-admits in on the forward stroke controlled by the timing of the cam. Happy experimenting |
| awemawson:
Here you are Matthew, a picture is worth a 1000 words :lol: |
| mattinker:
--- Quote from: awemawson on February 10, 2017, 12:50:30 PM ---Matthew, I vaguely looked into this about 15 !years ago - I saw a very similar Taiwanese saw in a used tool dealer, and there was a knurled knob on the end of a shaft emerging from the hole in the top plate that you used as a jig for drilling I suspect that there was a ball valve similar to yours, but with something pressing on the ball to give a controlled leak. If you think about it, if your ball valve is perfect, the blade will never descend ! The little cylinder just transfers enough oil into the bigger one to lift the blade off the cut on the return stroke, but re-admits in on the forward stroke controlled by the timing of the cam. Happy experimenting --- End quote --- That is what I'd thought, but, there were no traces of anything in and around the hole, no threads, no signs of anything! The one thing that is certain, a ball valve is required to allow the oil in. The small piston rises and falls, pressurising the large chamber raising the blade. The cam then allows the blade to lower, by venting partially the large cylinder through the port in the small cylinder. that much is clear, the thing that is not clear for me, which may have to do with the nob is lowering the blade down to the working position! The photo is not very clear! I just found this! Regards, Matthew |
| mattinker:
Andrew, I've also found a thread on an older structurally the same saw that appears on a thread here http://madmodder.net/index.php?topic=3483.msg37356#msg37356 I've sent him an email, so I hope that the person is using the same email adress now! Regards, Matthew |
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