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| Autonamous Nitro RC Car Thingy |
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| djh82uk:
Hi All Im not sure why I started this project, I was given the car in exchange for an RC helicopter (im not an outside kind if guy so I just have a small indoor size one now) I realised as the car was also an outdoor thing, and that they were not going for much on ebay due to all the cheapo ones you can get from china etc, I thought I would do something with it. Im doing it in 2 stages, first I will make all the upgrades that I feel it needs, and then work on the automation part last. Here is the car: The big thing on top is the exhaust that I am working on as the original one was broken, it has a cone inside to help keep up the back-pressure as the engine has no valves it needs the back-pressure to keep the fuel in the engine until it has burnt, Also the exhaust tip is threaded so I can try different ones until I get the right pressure. Today I thought I would make some headlights, I had some cheap chinese 0.75W luxeon led torches lying around, so i cut them up and machined a pair of blocks to hold them: I really did not think the the workholding through on the mill, as you can see I wasted a lot of material and while I normally use one of the holes to hold it down with a washer/bolt, the holes did not correspond to the T-slots on the bed, so I had to only cut so far and clean them up by hand, of which I did not do a good job as I drew them to be a sort of rounded square. Any tips on how I should have held these down? If I did not stop short on the milling they would have got caught by the endmill and ruined the part, aswell as which part of me they hit. |
| djh82uk:
Next i think i will work on the Camera mount, finish off the exhaust & start in the electronics, I also need to find a 12v Fish tank pump to prime the engine with fuel so that the car can start itself (originally you had a pipe from the exhaust to the sealed fuel tank, put a finger over the exhaust and the pressure build up would push fuel into the engine).. DJH |
| sbwhart:
Hi DJH Interesting car that :thumbup: I take it you used your CNC mill to shape the lamps, hmmmm interesting, as for clamping it down the easy way would be to use a sacrificial plate. :- Drill the holes in the job first, where you put the bulbs. Clamp the sacrifice plate to the table then clamp the job to it, with a bolt through the bulb holes, do your milling cutting into the sacrifice plate, job done. Hope this helps Stew |
| djh82uk:
Hi Stew Thats normally exactly as I do it (I get through a lot of plate :( ), but I messed up my calculations and so the headlamp holes were not in line with the t-slot, and by then it was too late as the mill had already done holes and I am useless at trying to set a job back up as it was, I need to learn how to center/edge fine better me thinks. I did everything the wrong way on these lamps, im suprised it even worked out, I didn't clamp them down properly, I did not start from home so I had an unknown offset and could not start again very easily. Think I am just going to use some angle brackets to hold them on, more pics to bore everyone later :) DJH |
| Divided he ad:
--- Quote ---more pics to bore everyone later :) --- End quote --- Erm..... Not wanting to sound like uncle Ralph.... but :worthless: .... That's why we're all here D :thumbup: :proj: needs visual feeding or it can get right out of control :nrocks: :lol: I'm liking where this beastie is going :borg: Keep it up :thumbup: Ralph. Oh, and I'm not following the T slots issue very well...... I'm going to have a think of how I would do it.... Pretty sure it's like Stew said.... I might try a C-o-C to show it too.... (others will probably correct me) and see if with the help of others we can pin a good method down :thumbup: |
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