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| NickG:
Plan for tonight is to get this frame finished and possibly do the bearing! But you've seen my outlandish claims before and by now probably realise I'll only get the frame done! :poke: Nick |
| NickG:
Hi, Didn't get the bearing done. Had a busy night. Badminton, then England game which I forgot about - what a result by the way, then 3 hours in the shop! I got the frame finished but it was 1am by that time so was too tired for the write up! Will have to be a double installment tonight! No more milling left on this project except for the wooden base, got the bearing, crankshaft, flyhweel, piston, inlet nozzle, & two pedestals to do along with the base. At least I have a bit of an assembly to show now, starting to look like an engine of sorts! Nick |
| NickG:
Hi, Bit more progress tonight, I’ve done the bearing. Starting to look like something now. Here are some pics from last night doing the frame and tonight the bearing. Set up in mill for drilling holes. Tried marking out with the blue this time, worked well I thought. After holes were centre drilled I cut the radius on the corner, opened out the bearing hole and tapped 5/16 x 32 TPI. I actually did this under power. Never tried that before, the mill has a 1000W DC motor and even at just a few rpm I couldn’t stop the spindle with my hand. I didn’t go mad tightening the tap in the collet incase it jammed, this way the tap would just slip inside the collet. It was fine though, tapped a nice thread which surprised me in this soft aluminium. Then I opened the two bolting holes to tapping size. You’ll see why later. Holes were drilled and tapped in bottom for pedestal support thingies! I made the mistake of trying to tap these under power too, big no no, was much smaller 4ba thread and I managed to mess up the top of the thread on one hole, luckily I stopped in time and there are enough good threads underneath. This is why I only drilled the bolt holes tapping size, so I could accurately transfer to the other half of the frame. Once this was done I could open them to 4 ba clearance size. That was the frame finished then. Tonight’s exercise was to make the bearing. I faffed around for ages trying to find a bit of brass, at one point I thought I was going to have to turn down some square, but then I found a big length of about ½” or 5/8” brass hex that I was allowed to take home from work! Turning down to size Cut 5/16” x 32 tpi thread, I just used a die for this applying light pressure with the tailstock to keep it straight. Drill the hole for the crankshaft with no 12 drill. The size is not mega critical since I will turn the crankshaft to suit. Part off to length under power after making an undercut on thread. The bearing: Tightening bearing into frame in chuck so I can drill oil hole in correct place. Oil hole drilled, csk and all completed components test assembled. Sorry about the quality of these pictures. Really need a better camera or learn how to use existing one better! Note I didn’t tighten the bearing back in since it all needs to come to bits to be cleaned, so the oil hole looks wonky! Quite pleased so far, if I can keep this standard of finish and fit up I’ll be chuffed, if of course it works! (Touch wood) Nick |
| sbwhart:
Looking good Nick Stew |
| spuddevans:
That's looking really good, you'll have a runner there before long :thumbup: Tim |
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