DaytonaTim Posted June 6, 2007 Share Posted June 6, 2007 Hello, this is my first post here. I have been coming to this site quite often over the past few months and I am amazed at the work that is shown here. I wish I could model like you guys do, but I am afraid I will never have the pateints (sp?) and skills like you have. Instead I model in 3D in the computer but I have decided to try and take it one step further.......and try and get my models actually "in hand" instead of on disk! So to make a long story short, I made a computer model of an Allison V-12 engine, built a CNC 3 axis router, and now I am slowly turning out the parts for it. I want a 1/6 scale model of the engine to go with the other 1/6 scale models I have collected, but I am also going to turn out a 1/8 scale model too. I have not figured out how to post pics on this forum yet, so here is a link to a website where I will be chronicaling the birth of this engine. http://public.fotki.com/gkulchock/allison-v12--18-and/ Quote Link to comment Share on other sites More sharing options...
Harry P. Posted June 6, 2007 Share Posted June 6, 2007 Cool project! Those 3D renderings are amazing! Quote Link to comment Share on other sites More sharing options...
Jairus Posted June 6, 2007 Share Posted June 6, 2007 Wecome Tim! Love the pictures of my fav WWII aircraft engine. Now do a Junkers!!!! Ok, kidding. But I'm not kidding about names.... we need your first and last name posted in the Signature Text Box found in the Profile section of this board. Other than that, you will fit in here beautifully! Have fun... 8) Quote Link to comment Share on other sites More sharing options...
Smart-Resins Posted June 6, 2007 Share Posted June 6, 2007 Again welcome aboard. I hope to see this project through and may be interested in a copy?? Quote Link to comment Share on other sites More sharing options...
Jairus Posted June 7, 2007 Share Posted June 7, 2007 I have been staring at your computer-modeled illustrations. Something seems slightly off. I noticed this as well on the AMT parts pac Allison. That is that the reduction gearbox is mounted too low on the engine. I think this is a mistake made at AMT. I would hope you wouldn’t make the same mistake with your fantastic and industrious project. Note the photo shown below. See how the crankshaft is lined up with the lower portion of the gearbox? The upper shaft should be lined up with the valley between the cylinders. Allison V-1710 Photo courtesy of CAF West Houston Squadron Photo courtesy of warbirdalley.com I would have posted one of the many pictures I took of this historic WWII powerplant but after an hour searching my hard drive … figure I lost it or named it something crazy like P0342346.jpg or so such rot. Quote Link to comment Share on other sites More sharing options...
Modelmartin Posted June 7, 2007 Share Posted June 7, 2007 Very cool project, DaytonaTim! Is the AMT Allison output meant for a shaft drive (automotive) application rather than a prop drive? begging forgiveness beforehand for momentarily hi-jacking but here is my Allison application. Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted June 7, 2007 Author Share Posted June 7, 2007 I have studied a lot of photos of variouse configurations of the Allison. Jairus, the photo you have is for an airplane application. and there is no doubt that the output shaft is much higher. For an automotive application, which is what I was going for, you definately would not want the output that high. It is kind of hard to line up the output shaft with a differential. Also since the max rpm on an Allison was 3000 and the "normal" rpm for automotive applications is about 6000 the rotational speed of the Allison needed to be doubled inorder for it to function with standard performance automotive components. The place on my model that you thought was the location of the output shaft (the upper cylindrical section) is actually the location of the crankshaft of the engine. The output for the engine is located at the lower cylindrical section. This arangement would make the unit not a gear reduction unit, but one that increased the speed and lowers the location of the output relative to the ground, more inline with what is necessary for automotive application. I have plans on working on the unit in your picture in the near future but for now I have way too much on my plate. Quote Link to comment Share on other sites More sharing options...
Olle F Posted June 7, 2007 Share Posted June 7, 2007 That looks like a very serious project! 8) And that home made CNC-machine makes me very curious... How did you build that? Quote Link to comment Share on other sites More sharing options...
Jairus Posted June 7, 2007 Share Posted June 7, 2007 Detroit made an automotive application for that engine? :shock: :shock: :shock: More likely it was a Marine application (PT boats or something like that) and that I can understand. Never seen that sort of gear housing. But here is another gear housing that is set lower. It is for the XP2H-1 Flying boat. Photo courtesy of oldengine.org At any rate, I would love to see progress on your project. Thank you for joining and posting. 8) Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted June 8, 2007 Author Share Posted June 8, 2007 Yes, that drive configuration appears to be a direct drive unit because it's output shaft is lined up directly with the centerline of the crankshaft. But who knows for certain. Certainly not me. Just and educated guess on mypart. Quote Link to comment Share on other sites More sharing options...
Jairus Posted June 8, 2007 Share Posted June 8, 2007 Hey Mark, you had better wait to see the price tag.... :shock: Quote Link to comment Share on other sites More sharing options...
Jairus Posted June 9, 2007 Share Posted June 9, 2007 Wellllll, truth be known.... I would love a copy myself. Something to place on a scale engine stand. Be very cool! However, I will wait to see what the final result and see what the bottom line is! :wink: Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted June 18, 2007 Author Share Posted June 18, 2007 Got some new updates posted for the Allison. Here's the link http://public.fotki.com/gkulchock/allison-v12--18-and/ Been spending my time on the 1/6 scale version. Man... is this thing getting heavy. The block is about 3.5 inches thick by 7 inches long and made in 4 separate section. Everything is glued together with temporary glue that dissolves in water I got my new tooling in and it is helping me up the level of detail. I'm learning something new with every new part. I am done with the very large parts now (block, cylinders and valvecovers) now I will be starting the intricately detailed parts. I will have to experiment with different tooling to try and pick up the finer details. Jairus, I am working on a gear reduction unit, like the one shown for the P-51. I will plan on including it in the 1/8 version I make. I figured I might as well try and keep the airplane modelers happy too. Quote Link to comment Share on other sites More sharing options...
Ettore Posted June 27, 2007 Share Posted June 27, 2007 Very nice work. What kind of cnc router did you build? I'm now working on one from the rockcliff plans. Cutting volume 12" X 12" X 5' - plenty large enough for 1/24th scale. Ettore Quote Link to comment Share on other sites More sharing options...
stbear Posted July 3, 2007 Share Posted July 3, 2007 I have three of the AMT V-12 engines and have been trying to detail them for a future project. Your site has really helped me. Can hardly wait to see the finished project. ST Bear Richard Constable Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted July 16, 2007 Author Share Posted July 16, 2007 Hey everyone. Been doing the family vacation thing for the past couple of weeks, but I have made some progress. Here is a link to the hosting site http://public.fotki.com/gkulchock/allison-v12--18-and/ Now that the machining is complete for most of the large pieces, I think I am going to concentrate on finishing out the parts I have to the primer coat level. This will give me a chance to fabricate a better dust collection system..... and cleanup my garage I am actually using the same Rockcliff plans you have, Ettore. I did take mine up to 19x19x7 so I could do the larger scale models and plan on incorporating a 4th axis as soon as I can find all the parts I need. I am also using the Xylotex stepper motors and controler with the Mach3 software. Stbear, here is a link to some Allison pics that show a lot of detail http://www.missthriftway.com/Photos/Engine.htm Quote Link to comment Share on other sites More sharing options...
Ettore Posted July 19, 2007 Share Posted July 19, 2007 4th axis??? I've given that a bit of thought. Maybe we should talk. Will you be at the Southern Nationals this November in Atlanta? Ettore Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted July 19, 2007 Author Share Posted July 19, 2007 No, don't figure I will be in Atlanta for the show. My friend, who's web site is hosting my pics, wants to show the allison at a show in October in Ohio. I think he said it was in Cleveland, I could be wrong though. I will just have to see how things shake out. My router went together pretty good with the excetion of the mounting of the oil-lite bushings. The way they describe it in their plans is cr*p and very prone to binding. How far are you on the fab of your router? Quote Link to comment Share on other sites More sharing options...
Ettore Posted July 19, 2007 Share Posted July 19, 2007 All parts cut, base and frame put together. I put Y table on frame but found that the Y table was wrapped because I used water based primer to prime it so that threw the parallelism of the rods off. Remade the Y table-oil based primer this time on the MDF -and am about to mount it again. Those rods have to be really parallel or they will bind. I epoxyed the oilite bearings in. Thought about a 4th axis to make 1/24th scale masters. Without a 4th axis to make a master, it would have to be a 2 piece master; not such a big problem but with a 4th axis, a bit easier. Ettore Quote Link to comment Share on other sites More sharing options...
Len Woodruff Posted July 20, 2007 Share Posted July 20, 2007 All parts cut, base and frame put together. I put Y table on frame but found that the Y table was wrapped because I used water based primer to prime it so that threw the parallelism of the rods off. Remade the Y table-oil based primer this time on the MDF -and am about to mount it again. Those rods have to be really parallel or they will bind. I epoxyed the oilite bearings in. Thought about a 4th axis to make 1/24th scale masters. Without a 4th axis to make a master, it would have to be a 2 piece master; not such a big problem but with a 4th axis, a bit easier. Ettore I am really facinated buy the equipment your are building. Can you post pictures of this machine equipment? Quote Link to comment Share on other sites More sharing options...
Ettore Posted July 20, 2007 Share Posted July 20, 2007 I'm on dialup connection now so too slow to upload images. Go to: www.rockcliffmachine.com for info and pictures. Also go to cnczone.com and register; then search for the rockcliff discussion thread. Plenty of info there. I have high hopes for this machine. and there are several others interested, too. I've spent too many days carving out masters and filling and recarving again and again. Ettore Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted July 20, 2007 Author Share Posted July 20, 2007 Those rods have to be really parallel or they will bind. I epoxyed the oilite bearings in. That is exactly what I did. I first cut a single saw cut down the centerline of the components for each bearing pair. Put both bearings on the rod. Put the epoxy on the wood surface. Then layed the rod/bearing assembly in the groove. The rod lined up the bearings relative to each other and the grooves kept the two rods parrallel to each other. It worked like a champ! I have been toying with the idea of carving out a 1/18 scale body of an Aston Martin DBR1 I modeled a while back. http://www.turbosquid.com/FullPreview/Index.cfm/ID/331931 I think I can do it with a two sided machining process (ie machine from the top down, flip the part over and machine from the bottom down). I have yet to do any 2 sided machining and I think I am going to hold off on the body until I can experiment on some smaller parts. The estimated time to carve the body is about 20 hours, that is waaaaayyyyy too much time to invest in my first 2 sided part. Ettore, do you do 3D computer modeling? Quote Link to comment Share on other sites More sharing options...
Ettore Posted July 20, 2007 Share Posted July 20, 2007 Not yet. My interest would only to be to model the cars in computer to mill the bodies, not do the "virtual models". I hang out at www.smcars.net. Thousands of plans there and many very good modelers (virtual modelers). I have a 19 year old German virtual modeler wiz interested in modeling some of the cars i would like to mill out and build. Ettore Quote Link to comment Share on other sites More sharing options...
DaytonaTim Posted August 22, 2007 Author Share Posted August 22, 2007 Work continues on the Allison. I started painting it..... I had to get rid of that "rock" look. Nothing fancy, just some rattle can paint http://public.fotki.com/gkulchock/allison-v12--18-and/ Quote Link to comment Share on other sites More sharing options...
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