Peter 'Ivanna Crashalot' Savage Posted February 27, 2009 Share Posted February 27, 2009 I just got a free license for Autodesk inventor and i have drawn up an engine from some engineering sketches I have been doing for the last week. I am saving up for the same lathe that Alex Whittaker got as he seems to think it is quite good! Comments! Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted February 28, 2009 Share Posted February 28, 2009 It'll never run - its got no carby Quote Link to comment Share on other sites More sharing options...
Stephen Grigg Posted February 28, 2009 Share Posted February 28, 2009 Im amazed with what you can do with a computer if you have the know how program and ability,Im very impressed with what you have produced Peter,myself I go for the ARTF engines,frowned upon by the old school though Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 1, 2009 Author Share Posted March 1, 2009 Or exhaust and fuel ports timbo!!! this is just a basic drawing animation and i hope to be able to make one some time. It would be a great thing to say on my university interview to say i have made and internal combustion engine, that and it will be cheaper than buying it and it is taking the scratch building a model that one step further! next i could make my own spektrum receiver and servos!!! I am annoyed that it will probably take me a few years to earn the money to get the lathe, unless anyone wants to donate :D my current balance is £40 with £29 in the bank account :D Before i did this i always thought Cad and animation was hard, though this took me less than a day to create and animate using AutoDesk Inventor Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 1, 2009 Share Posted March 1, 2009 I could just about flog you a spare 3 jaw chuck for that money Peter...keep saving mate! Seriously though, do try and go for it, having a lathe opens up all sorts of interesting projects - I have never done anything as complex as an engine it self, but have lost count of the number of little widget thingies that I have done. Having the skill in CAD as you also possess is a bonus - my technical drawings are still donr on the back of the cornflakes box There is something strangely satisfying about the whole turning , drilling /milling process. Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 1, 2009 Author Share Posted March 1, 2009 yeah i have just finished doing workshop at my college, e.g messing around with lathes, mills and acetelyn torches!(we were doing case hardening a drill drift and hardening and tempering a screwdriver) and that screw driver is perfect for adjusting carbs! My grandad said i could have his massive one but there is absolutely no room for it in our house Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 1, 2009 Author Share Posted March 1, 2009 Heres some Engineering sketches I did Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 1, 2009 Share Posted March 1, 2009 Theres room in mine Quote Link to comment Share on other sites More sharing options...
Phil Claridge Posted March 1, 2009 Share Posted March 1, 2009 for spearing sticky buns or toasting them Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 1, 2009 Author Share Posted March 1, 2009 huh? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted March 1, 2009 Share Posted March 1, 2009 old joke Peter..... theres a filthy rumour that I like me sticky buns ( I do ) Quote Link to comment Share on other sites More sharing options...
Chris C Posted March 2, 2009 Share Posted March 2, 2009 O.o Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted March 2, 2009 Share Posted March 2, 2009 Peter Drawing an IC engine is one thing but actually building it requires a pretty high level of workshop skills. A long time ago "building you own" was not unknown but usually with the help of a crankcase casting, then all the machining required could just about be done on a lathe, but nevertheless all the more power to your elbow and have a go! If you can design and build your own engine - and get it to work - you will be joining a pretty select band! Good luck. Quote Link to comment Share on other sites More sharing options...
Chris C Posted March 3, 2009 Share Posted March 3, 2009 do you have any dimeshions yet?? Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 3, 2009 Author Share Posted March 3, 2009 I have cleverly designed it so far so that it can be mainly produced out of one dimention of square bar stock for both the crank case and the cylinder. I have designed the crank case so that it can be produced solely on a lathe and for just £60 extra on this lathe you can get a Y axis attachment to effectively turn it into a mill. Chris C: No i do not have any specific dimensions at the moment but i intend to be able to make possibly a .40, but to begin with i would like to try making a .25 as i already have a .40 that can be used in any other model. The most time consuming thing for development may be getting the fuel and exhaust ports in the correct place. According to a YouTube video animation as the piston goes down on the power stroke it opens the exhaust then a split second after that it opens the fuel port. I am really getting excited now! I drew out a BS8888 Engineering drawing sheet for my college work and dad took it into work and photocopied it onto A3 for me, i may draw out some rough dimensions but i assume the size will compare to other commercially available engines (i sound like i work for an engineering company doing market research :P) I do have some workshop experience, i made some kind of handle in college and i milled and grinded a parallel and i have always been a quick learner for things relating to engineering! heck, i made my first steady hand game in year 5! My Grandad has a large lathe and he gets all the jobs to do from his flying club. I come from a long line of engineers. My Grandad maintained Blenheims in WW2! Anything i need to know, i am guessing my dad or grandad will know it! Who knows maybe after i build this one i may go onto build 4 strokes of all sizes, ok maybe i am getting a bit ahead of myself! Peter Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted March 3, 2009 Share Posted March 3, 2009 go-on peter--the enthusiasm of youth----put some in a bottle and sell it............ ken anderson................. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted March 3, 2009 Share Posted March 3, 2009 Have you considered using a commercial piston, liner and crankshaft for your first attempt? That way, you can practice making the outer components to the required tolerances and have confidence that the engine should run. Such things as piston taper, port timing, crankshaft grinding et. which will make a lot of difference to the finished article will be simplified and once you've got a running engine you can start substituting and experimenting with your own designs of the critical parts. Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted March 3, 2009 Share Posted March 3, 2009 Personally Peter though I admire what you are doing, if it were me I might go for producing an established design first. Old Model Engineer magazines used to be full of the designs, including the tolerances to work to. Martin has also provided a realistic proposition in using ready made components. I would not endeavour to do what you are doing from scratch as a first project. I was using a lathe when I was 6 years old, My father was a model engineer, I grew up to be an aerospace engineer, but I sure wouldn't hope to be able to do what you are attempting with basic workshop equipment without completing several established designs first to get a feel of what was involved. Still, best of luck with it. Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 3, 2009 Author Share Posted March 3, 2009 i had the idea of mounting a rotary tool with a grinding wheel onto the cross slide so that i do not a cylindrical grinder, shouldn't be too hard to work out some sort of mount. Is the taper in the cylinder mandatory? P.S what is your avatar Gemma? i can't work out what it is Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted March 3, 2009 Share Posted March 3, 2009 Is this clearer Peter Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 3, 2009 Author Share Posted March 3, 2009 ah yes it looked kinda like someone sleeping on a pillow on a black sofa! Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 4, 2009 Author Share Posted March 4, 2009 oops double posting Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted March 4, 2009 Share Posted March 4, 2009 I guess because I knew what it was I didn't see it like that, I'll have to upload it again, it was lost when the platform changed and seems to have got a bit corrupted when I uploaded it again. It isn't Cylinder Taper it is Piston Taper - it is generally used to keep the correct clearance Peter and it is going to be very important indeed. The top part of the piston is going to be hotter in use than the bottom, it is going to expand more. One needs to consider this in the design and the usual way is to make the crown of the piston a smaller diameter than the skirt so as it heats up it can expand to the correct clearance Try page 7 of this link, it shows a diagram which probably explains it better than I can in words clicky Not a bad PDF that one for some guidance of general principles Quote Link to comment Share on other sites More sharing options...
Peter 'Ivanna Crashalot' Savage Posted March 4, 2009 Author Share Posted March 4, 2009 could you not heat the end up to operating temperature then drill it out? I am looking forward to see when Alex Whittaker releases how he did his! Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted March 4, 2009 Share Posted March 4, 2009 Not with you Peter, drill what out? Quote Link to comment Share on other sites More sharing options...
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