Nick Jones Posted June 30, 2018 Share Posted June 30, 2018 Got to admire your clamp collection! It is quite hard to believe you need another! Serious bodywork nearly done now Nick Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 3, 2018 Author Share Posted July 3, 2018 Yep, getting close. Link to comment Share on other sites More sharing options...
Nick Jones Posted July 3, 2018 Share Posted July 3, 2018 Impressive attention to detail as always Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 6, 2018 Author Share Posted July 6, 2018 Link to comment Share on other sites More sharing options...
Nick Jones Posted July 6, 2018 Share Posted July 6, 2018 Unwanted hole (OE though?) now gone. Oven to pre-heat casting. Not quite sure what honking great finger crusher for...... Nick Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 7, 2018 Author Share Posted July 7, 2018 Very unwanted hole - not oe - it blew through during hydroblasting, a result of trying to maximise case volume by expanding the crank void to the maximum possible, might have overdone it. Hopefully filled now. Oven cost me a sold 10 bucks on ebay! Neededto cut out and bend a 25mm by 270mm piece of 1.5mm sheet to fill the rear base of the legshield. Was planning on cutting it out with an angle grinder, and bending it in a vise, but Mat laughed and used his toys to good effect. Nice to have friends, Hope you're improving, C. Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 9, 2018 Author Share Posted July 9, 2018 Had a good day in the garage building up a buddy’s motor that’s the fraternal twin to Buffy’s he’s pretty chuffed... the inside of the crank housing weld cleaned up ok Sunday I milled down the massive pimples left after building up the ports for machining and this arvo the base of the leg shield got sealed up Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 13, 2018 Author Share Posted July 13, 2018 Went to Alan's headquarters today, and did some measuring. We put up the first engine, with the piston at TDC (re-measured with a dial indicator). We touched off the face of the cylinder, and established a plane there as a base. Next we touched around outside wall of the protruding piston to give us a reference circle to work within. Finally, we touched off four points as close to the outer edge of the face of the cylinder as possible, two in line with the gudgeon pin and two perpendicular to it. We may have got some minuscule piston rock on the across touches, so we'll trust the "along" numbers. Here they all are... Basically, they show that along the gudgeon pin, the piston edges protrude 1.6251mm (averaged), and across it, 1.6118mm. So lets call it 1.63mm for our purposes. Next the second engiine (Mine!) went up After the TDC procedure, we measured again Across the pin we'll call mine 1.94mm Next we measured the cylinder itself, including some numbers for future reference in case we want to mill replacements later (Outer holes, combustion chamber sphere etc) . The squish area of the cylinder head is a sloped ramp, which then meets a short outer cylindrical wall, which then in turn meets the outer mating face. We need to know the height of the cylinder wall, s (a) it will allow us to set our squish, and (b) it will form the hard limit of how far the piston can protrude from the cylinder, lest it mash into the head, rapidly, with great and expensive force... Because the wall meets a sloping face, accurate measurement required some maths and calculation. First, we touched off points on the upper face, and made that a reference plane. Next we carefully touched off points on the inner wall of the cylinder, all at the same height. (with the software, if you tell it your're measuring the inside of a circle, and touch three points, it can extrapolate the circle. Touch more points, and you have more accuracy). Once we had the circle, we then had the software expand it into a cylinder, perpendicular to the original top reference plane. To measure the squish ramp, we told the software we were measuring a cone. By touching off points up, down, and around the ramp, we were able to calculate the ramp. then find (a), where it intersected with our wall cylinder, and (b), how far down from the top reference plane that intersection was. Abracadabra, the built in squish headroom for the cylinder is 0.9252mm. Lets call it .93. So as they stand, we're going to make expensive noises with our 1.63 and 1.94 popups. On to the cylinders. We measured these with a 90 degree probe, trying to get about 0.8mm into the port to beat the roundoff on the edges. Because we have the current popup numbers referenced to the top face of the cylinders, we were able to take these off the engines and measure them stand alone. Results for #1 and mine. Mains on #1 are 38.87 39.01 38.64 and 38.78. (Average of 38.83) Exhaust is 27.46. So 130.12 and 185.29 with 27.58 and zero deck, and 132.87/187.51/27.32 with 0.5mm popup. Mains on mine are 38.65 39.09 38.58 and 39.23. (Average of 38.89) Exhaust is 27.97 So 129.79 and 183.02 with 26.62 at zero deck, and 132.54/185.25/26.36 with 0.5mm popup. Now I'm off to consult guru's and do maths... Link to comment Share on other sites More sharing options...
Nick Jones Posted July 13, 2018 Share Posted July 13, 2018 Wah......., heavy man! Glad you know what you're doing! Nick Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 14, 2018 Author Share Posted July 14, 2018 Yep - the maths is starting to blow my tiny brain. Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 19, 2018 Author Share Posted July 19, 2018 A trip to Alan's shed tonight for some programming. My buddy Michael had provided this as the basis for the cylinder spacer. That let me build up this in a mere 24 steps. But I needed to step the ports out 3mm horizontally over the 10mm thickness. Each arc for example has 13 adjustable variables to be set, with 3 check results. Then there's lines, blends, depths, and repeats. Which meant lots of maths, educated assumptions, (and a buttload of scientific wild arse guesswork). Till I had this It was 4 degrees in the shed, and almost 10pm, so I saved it and naffed off home for a hot toddy. I'll cut it tomorrow. Link to comment Share on other sites More sharing options...
yorkshire_spam Posted July 19, 2018 Share Posted July 19, 2018 Awesome stuff! Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 20, 2018 Author Share Posted July 20, 2018 Clamp Cut Think and program Cut more and more And parts magically appear Oh, and re-re-re-cut the top surface... Link to comment Share on other sites More sharing options...
Nick Jones Posted July 22, 2018 Share Posted July 22, 2018 Nice toys.......... I like my mill but it doesn't do clever stuff like that. Link to comment Share on other sites More sharing options...
GT6MK3 Posted July 22, 2018 Author Share Posted July 22, 2018 Yep, it's an awesome toy. wish I had the garage big enough to house one, and the budget to buy one. Luckily, Alan lets me use his! More work I the garage Saturday. Sadly, I overdid it pressing a bearing holder into a 50 year old engine case and cracked it, which was cause for a large amount of swearing, and will require the opening of my wallet to fix. Dammit. My buddy Michael was able to continue his build though, and more port grinding ensued. And, with the arrival a third set of hands and experience, the stuffing of oversize parts into an undersize case began Link to comment Share on other sites More sharing options...
GT6MK3 Posted August 15, 2018 Author Share Posted August 15, 2018 Buffy hasn't been forgotten, but her powerplant has been taking much longer than I anticipated to put together. Everything almost fits, and everything that doesn't quite needs careful thought and precise fettling to make right if she's going to be capable of the rev's she'll need. And then of course, there's my idiot/rookie mistakes. Today's task was to put together the clutch cover. Should be simple, but there's aftermarket bits, which precicely almost fit, and I needed to waste hours filing, sanding, twisting, heating, cooling, clamping, swearing and pondering. Eventually, without breaking too many parts, this simple assembly was together. Easy. I should have left it there. Instead, I decided to fit it. And dropped a clutch cover bolt (actually a high tensile M6 socket head screw), into the open clutch case. Sod's law dictated that it (of course), immediately rolled through a tiny gap, into the gearbox. Fair to say I was displeased. Genius that I am, I gently rolled the case over, and tried to gently shake it back out. Which resulted in a click, a clunk, and then silence. Yep, I'd got it jammed in the gearbox. A machine screw floating in the gearbox is not ideal. After a short, blue coloured hiatus, more shaking and swearing (if it was a baby, I'd have been arrested), and some general poking around, I remembered I impulse bought an inspection camera at Aldi a while back. Oil filler bolt out, camera in, a bit of wiggling, and the little bugger came into view. Half an hours prodding and probing with a bit of bent mig wire, some more rolling of the case, and I'd got it loose of where it had wedged, and worked it up towards the front of the gearbox. Now to get it out. So I glued a rare earth button magnet to a thin screwdriver and went in on an angle past the clutch I felt like Jack Swigert trying to capture the LEM in Apollo 13, I really didn't want to have to split my pressure tested cases, so it was a delicate operation done juggling the mag stick, the camera probe, and the screen, but before too long I had "Capture", as the bolt jumped onto the magnet. From there it was a twisting and turning in and out see saw to gently twist the bolt out of the gearbox, through the slot, and under the clutch. Finally though, Success It reappeared. Good tools, Are their own reward. Craig Link to comment Share on other sites More sharing options...
thebrookster Posted August 15, 2018 Share Posted August 15, 2018 Thats a damn good quality picture on the camera!! I occasionally have to use a ridiculously expensive FLIR one of those on the ship's, and to say it is awful is an understatement. Several thousand dollars of waste. Phil Link to comment Share on other sites More sharing options...
Nick Jones Posted August 15, 2018 Share Posted August 15, 2018 These things are sent to try you. And do. "Blue coloured hiatus" Yeah. Maybe some small tools ricochetting of the walls too. Can relate. Nick Link to comment Share on other sites More sharing options...
GT6MK3 Posted August 22, 2018 Author Share Posted August 22, 2018 After a long road, I headed out to the garage last night to prepare Buffy's powerplant for it's first fireup. Today I headed back to Mat's factory after a work induced hiatus. Clamped up the first of the underfloor bracing ready for welding (You cant use too many clamps!) And made a start on glueing them in Link to comment Share on other sites More sharing options...
Nick Jones Posted August 22, 2018 Share Posted August 22, 2018 Hah! It runs....... Did it really start first kick........ or was there some undocumented cussing........ my 2 stroke experiences all involve much cussing! Frame must be nearly done now? Nick Link to comment Share on other sites More sharing options...
triumphlux Posted August 22, 2018 Share Posted August 22, 2018 You really seem to have to much spare time to produce such COOL videos Well done, sounds pretty agressive for a Vespa engine ! JC Link to comment Share on other sites More sharing options...
GT6MK3 Posted November 2, 2018 Author Share Posted November 2, 2018 Time to get back to work. Need to let the horncast into the legshield So mark it out Start cutting the top layer gently Keep cutting Get aggressive and you have yourself a hole Link to comment Share on other sites More sharing options...
GT6MK3 Posted November 13, 2018 Author Share Posted November 13, 2018 With the hole cut, I traced then cut a paper template Then created a centerline That was transferred to the horncast pressing, and I rough cut it, then filed it back for fit up and filed and filed Which went well, except a slight bodge at the top, and a gaping hole at the base... That will get interesting later... Meanwhile, Mat got tacking. We worked everything to keep the but joints flush as we tacked down the curve of the legshield and used the clamps to keep the curve smooth There's a lot of grinding and sanding in my future (again), and I need to fettle the horn piece before I fit it, but the worst is over. Link to comment Share on other sites More sharing options...
Nick Jones Posted November 16, 2018 Share Posted November 16, 2018 Would those normally just be spotted on top of the leg shield? Or is it after market panels being done differently for pressing simplicity? N Link to comment Share on other sites More sharing options...
GT6MK3 Posted December 13, 2018 Author Share Posted December 13, 2018 They're integral to the original panels, but somehow missing from the replacements. The actual horn holding part of the horn cast is normally spotted on. I can't seem to find a spot welder that will work through weld through primer, so it was more drill and puddle weld. But... Look who made it home after a mere 245 days on the surgeons table Link to comment Share on other sites More sharing options...
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