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| 'Poppin' Flame Licker |
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| NickG:
Well, it's been almost a year but I'm finally going to get back onto this project tonight! Lets see if I can get these working, if they do, my Dad will get one for his Birthday in March instead of ebay getting it to make up for the non-working Tiny Stirling he got for Christmas! Right better get out there armed with the camera, I think when they get looking more like engines I'll become more motivated! Nick |
| NickG:
I felt sure this morning that I was going to go into the workshop tonight but after a week at work I was considering having a rest and going in tomorrow - glad I forced myself to get in there. Only made a little bit of progress but better than nothing. When I left this project I was milling the frame which is from solid alloy bar and my vice broke. A while back when I started the 7 1/4" loco I managed to do a bodge repair to the vice which seems to be holding up (touch wood). I then got about 1/2 way through the loco build and got bored, then got :proj: and decided to make a tiny stirling - that didn't work, so back onto the two poppin flame lickers I started almost a year ago. 2010 proved not to be a very productive year in the workshop, lets hope 2011 can be! The frame went back into the vice to mill out the middle leaving the radii, roughed it out first: Other side and getting through it now, I wasn't really enjoying this and contemplated handsawing most of it out - but that was taking even longer with an abrafile! Taking the finishing cuts and climb milled with no extra cut on which gave a decent finish: That's the profile milled out and de-burred: Now I had to flip it in the vice so it was upright and mill to size before milling the slot for the crankshaft. I had a bit to cut off the top of the bearing supports and a bit off the over all thing so marked that out. I hacksawed a bit off the top of the bearing supports to save me milling loads off. :doh: Nearly hacksawed on the wrong line at first, the lower one is for the bearing bore - that could have been a disaster! Back into the milling machine but upright as I said to mill to height: This is about where I left it tonight as am a bit tired, I've de-burred it and have it clear in my head what to do next thanks to Jim's build notes. I need to drill and tap the holes for the bearing pinch bolts, mill the slot for the crankshaft. Saw off parent stock, invert in vice and finish the cylinder face. Bore cylinder face and transfer bolt pattern from cylinder cover. Flip in vice and mill slots in bearing supports. Finally flip upside down to drill and tap some mounting holes. I don't think I'm going to bother with the thin metal base, don't see the point really, it can go straight onto the wood. Thus far I've made 2 of each component but now I'm deliberating whether to drop onto one engine and progress more quickly to keep me interested. Or just battle on and make another frame. hmm .... Nick |
| jim:
looking forward to the next instalment |
| NickG:
Cheers Jim, thanks again for those bearings by the way. Got a bit more done tonight. Wow, this frame is possibly the most complicated component I've made, it's not been difficult (so far - :lol: tempting fate here) but a lot of work in it and still not finished. First job was to drill holes for pinch bolts, these are - can't remember size but my equivalent is 10ba, so drilled down with No 54 then opened top out for clearance to No 50. Haven't tapped yet, will do that by hand later: Then start milling away the middle to leave the 2 uprights. Here I just got it some where near the right width then took some small finishing cuts after: Finished milling - took a while, actually I had a cup of tea in between as I thought I was going to get impatient and mess it up! Also thought I'd leave the machine to cool a bit. Back in the mill on its side to drill holes for bearings, I centre drilled, drilled through 1, then picked a sturdy ish drill to go through to the other using first as a guide. Then opened up. That's it drilled to final size - tried the bearings they are a sliding fit so should be perfect for screw just to pinch. Marked out position of valve pivot. While it was on its side I drilled the hole for the valve pivot. That is about as far as I got, just de-burred it. Still a bit of work here! * Saw it off the parent stock Mill flat Bore large hole Transfer cylinder bolt pattern Drill valve rod hole Mill slots for crank to pass through Drill & Tap mounting holes Tap Pinch bolt holes * Don't know, maybe it sounds more than it is but I'd say at least another night on it. I need to think of how I can bore it to 11/16" Don't think I've got a drill that big, have a 5/8" end mill. Might have a look at drawings to see if it's necessary to go the same size as the cylinder bore. Nick |
| madjackghengis:
Hi Nick, if you don't have a boring head, you can use a straight boring bar in a collet with a HS cutter sticking out, ground to appropriate angles, and adjust the tool out with a dial indicator or even just a stop and feeler gauge to get that bore. That frame is looking good, ought to get the second one out while you're feeling good about the first one looking so nice :poke: glad to see you back on the "poppin", I'm looking forward to seeing and hearing it running, in tandem I hope. mad jack |
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