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| ParCan:
Hi All Bit of an update. (sory no pics). Yestarday I made the crank webs. They are not easy, far from it. I started 6, 1 parting off failure. Got 5 completed. Of the 5, 3 are perfic. 2 the Screw hole was off center. All in all I think I have 4 usable, time will tell. Assembled the crank and it turns quite freely in my origonal bearing blocks. Maybe they will actually work so I Turned the Boss on those. Today I made the pillars, the lengths are slightly wayward at the moment all to long. I Bolted the crank and block together and the whole thing locked up solid. A few washers and bits of shim and things are better on the crank but both Crossheads are very unhappy. Lostened the Rods and made some improvements but they are still far from good enough. Made the Con rods from 6.5mm (well a tad under) hex Brass, had real fun centering those to drill the holes. I put a 6.5 mm drill in the Lathe chuck and raised the Milling vice until the jaws just touched. Center drilled and then reamed to 4 mm. Measuring 28.5 mm then became an issue. I have a Metric Screw in the Cross feed. 14 1/4 turns /should/ give me 28.5 mm yes ????? It was closer to 30 mm I checked lash and that was fine. Barely any. Tried again - measued it this time and 14 1/4 turns on my metric screw = 29.8 mm Makes no sense whatsoever to me I have to say...... 3rd attempt I got 2 Usable Con rods. Went to make the Pins and destroyed all 3 points on a carbide insert. Gave up for the day at that point...... There must be a trick with silver steel. I just have yet to find it. Couple of Q's. How do I line up the flywheel to drill the Screw hole? How do I turn something accurately (such as the pillars) to length ? What is the secret to turning silver Steel without chipping your carbide Inserts ? I'll get some pictures for you tomorrow. Alex. |
| ParCan:
Silver Steel Q solved Slow down and use Cutting oil :) |
| mzt:
--- Quote --- [1] How do I line up the flywheel to drill the Screw hole? [2] How do I turn something accurately (such as the pillars) to length ? --- End quote --- 1) Chuck in a pointed rod ot tool and place a ruler over the workpiece, bring them into contact and move the workpiece till the ruler is square to the tool. 2) I use a spindle backstop or a micrometer stop for the saddle, often together. A word of caution about the item in the first picture: it must NOT be used when protruding from the back of the spindle more than a little: it would bend and hit You. That handy knurled wheel on the far end will increase the risk. Replacing that long threaded bar with a shorter one would be quick, easy and safer. ..and a word of caution about the second: running the carriage into the micrometer stop under power does no good to your lathe. Do not ask why... Marcello |
| ParCan:
Hi. At long last some pictures ...... The engine turns but there are issues with the Con Rods and Cross Heads. I may need to remake the Top Plate. the Con Rods i can dress dowm a little. Started this am on the Spool valves. I think the pictures tell their own story :( It's been costly. 2 Totally destroyed Tips. 1 partially desrtoyed. 1 Broken M2.5 tap. I started with 300 mm of 6mm rod, 50 or so mm left. It's taken me all day to get 2 Spool Valves. |
| spuddevans:
We all get days like that Alex, in my paddleduck build, in total I ended up making 4 spool valves (2 had far too much leakage in the bore of the valve) I too had problems getting it to turn over smoothly, the best advice I can give you is to just take your time and work methodically through where it is sticking. On mine it was only slightly binding up, but it was binding up in quite a few places and so all that "slight binding up" added up :Doh: I ended up slimming the con-rods down using a bit of emery held on my surface plate, that along with fiddling with the crosshead bars after enlarging their mounting holes in the top plate, got me to the point where there was much less resistance. Then I left the fiddling until I had it ready to run on air and did any last fine-tuning while running it in. Stick at it, it's coming together nicely. We're starting to see an engine appear :thumbup: :thumbup: Tim |
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