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Yeah those tight radius splines make things less easy, but there are probably people out there better at this than me. Not exactly what I pictured when I read sprocket. Maybe this is the job for a live tooling lathe or a setup on an indexer? Or get one of those joints who laser sinters metal to take a peek 
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Mar 12, 2015 19:02
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Okay now this is properly brilliant: 3D Printed, Working miniature manual transmission: https://www.youtube.com/watch?v=SB34I33Bqrg Found here: http://3dprint.com/50265/3d-printed-toyota-transmission/ By way of: http://www.thetruthaboutcars.com/2015/03/make-toyota-transmission-home-kind/
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Mar 12, 2015 22:40
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I want that so bad
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Mar 12, 2015 22:57
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slidebite posted:I want that so bad Oh you mean you went "I wanna play with it tooooo!" also?
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Mar 12, 2015 23:14
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cursedshitbox posted:I use Alibre which I think its called Geomagic now. CommieGIR posted:123D Design by AutoDesk, includes tools for 3D printing. Thanks for the suggestions. I stopped by my university last weekend to see some friends and check out their current Supermileage vehicle. Going from all carbon fiber to mostly aluminum was an improvement.    
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Mar 13, 2015 14:58
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This might be a bit boring but could someone smart do a good writeup on 02 sensors and fuel trims. Specifically what numbers (mv) to look for when doing a diag on convertors, emissions and 02 sensors? Or at least point me in the right direction. Thanks in advance.
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Mar 21, 2015 21:25
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Party Alarm posted:The next step in this process was to remove the stock e30 hubs and do a LOT of measuring. I wanted to be sure this idea was viable before I reached the point of no return and pressed the hubs on, so I mocked up both the front and rear assemblies in Solidworks. Could you please email me at SA<My name>@gmail.com? I've got a similar, but different brake project in mind, and I'd love to be able to use your models to save some time.
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Mar 22, 2015 20:39
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I have a very very custom brakes issue that I need some help in visualizing. This is on my 6x6. Would this be the thread to ask in ? I need to redesign the plumbing as the brake system is 2 separate systems. System 1 drives the steer axle, System 2 drives the rear two axles. Both systems are actuated from a single brake pedal that drives 2 master cylinders which each drive two seperate vacuum assisted slave cylinders. The problem is System 2 is driving double the brake cylinders and so requires double the volume change to make the brakes work. I'm running out of volume before the rear axles brakes engage. I think. All 6 brakes are rockwell military 15" drum brakes driven by a single brake cylinder for each wheel.
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Mar 26, 2015 18:11
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jonathan posted:I have a very very custom brakes issue that I need some help in visualizing. This is on my 6x6. Would this be the thread to ask in ? I need to redesign the plumbing as the brake system is 2 separate systems. System 1 drives the steer axle, System 2 drives the rear two axles. Both systems are actuated from a single brake pedal that drives 2 master cylinders which each drive two seperate vacuum assisted slave cylinders. Dumb question, are the read drums adjustable and have they been adjusted?
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Mar 26, 2015 18:21
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So all the wheel cylinders are the same size? Having double the area for the rear master cylinder will give you the same displacement for each end, which you want to get them all to engage simultaneously, but only half the force at each rear wheel. So if you plumbed a bias valve into the front system you could reduce the line pressure if there is too much front brake.
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Mar 26, 2015 18:28
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Also see: brake balance bars e: Shouldn't the volume change be a smaller concern than the force at each brake drum? I imagine properly adjusted only a small amount of pedal travel is for take up, most goes to pressure -> force at the brake pad right? Party Alarm fucked around with this message at 19:00 on Mar 26, 2015 |
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Mar 26, 2015 18:57
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Sorry I posted the brake issue and then got sent to work on a 20 hour shift. I'll clarify and answer questions in the morning.
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Mar 28, 2015 06:45
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Preoptopus posted:This might be a bit boring but could someone smart do a good writeup on That's a pretty generic question and different OEMs employ different methods, and the nitty gritty may be proprietary information that people can't divulge. (Obviously beyond what you can find through google.) It would help if you had more specific questions.
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Mar 31, 2015 04:21
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Forgive me for posting another PDF, but this is quite good, Motor Gas Technical Review: http://www.chevron.com/documents/pdf/MotorGasTechReview.pdf quote:The development of the electric light and the astonishing popularity of the automobile in Preoptopus posted:This might be a bit boring but could someone smart do a good writeup on Try these: http://www.4x4wire.com/toyota/4Runner/tech/OBDII_ECU/ https://www.linnbenton.edu/auto/scope/o2.htm The term you are looking for is oxygen sensor switching voltage, I think. That and closed loop fuel control. From a PDF that I have that I can't find online anymore:  For everything except the newer wideband sensors, I think the switching across 0.45 volts thing is pretty much universal. Edit: http://www.mr2.com/TEXT/O2_Sensor.html Vanagoon fucked around with this message at 08:01 on Mar 31, 2015 |
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Mar 31, 2015 07:40
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Party Alarm posted:
Did you try printing this model yet? I just picked up a 10" makerfarm kit and am looking for things to print, any chance you could upload the model file?
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Mar 31, 2015 07:52
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SFH1989 posted:Is there a reasonably priced non Inventor has a 3 year free trial student edition, all you need is a .edu email http://www.autodesk.com/education/free-software/all
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Mar 31, 2015 19:57
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way to get a solid modeling program? I haven't done any since I graduated and I need practice.
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Party Alarm posted:e: Found another way Party Alarm Would you be willing to help me clean up a model for 3D printer? I lack the skills.
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Mar 31, 2015 20:33
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I'm a bit overwhelmed right now, I can possibly help if you can wait a few weeks
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Mar 31, 2015 22:56
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Party Alarm posted:I'm a bit overwhelmed right now, I can possibly help if you can wait a few weeks Gladly, I doubt I'll perfect my AutoCAD skills within that timeframe
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Apr 1, 2015 02:14
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Proud to say I am posting in this thread as a Mechanical Engineer now. Paging CommieGIR - I should have time to help ya!
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May 31, 2015 04:56
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Party Alarm posted:Proud to say I am posting in this thread as a Mechanical Engineer now. Congratulations and welcome to the party. We don't rally dance here though, we mostly just stand awkwardly around the edges of the room not sure what to do with our hands.
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May 31, 2015 08:10
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torpedan posted:Congratulations and welcome to the party. We don't rally dance here though, we mostly just stand awkwardly around the edges of the room not sure what to do with our hands. You went to the party? Party Alarm congratulations, welcome to the
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May 31, 2015 08:20
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Congrats. Look forward to working with weirdos and thinking you're not one of them. (you are)
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May 31, 2015 23:09
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torpedan posted:Congratulations and welcome to the party. We don't rally dance here though, we mostly just stand awkwardly around the edges of the room not sure what to do with our hands. Im actually p good at dancing. SO SPEAK FOR YOURSELF
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Jun 3, 2015 00:20
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I can make a car dance 
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Jun 3, 2015 01:51
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Party Alarm posted:Paging CommieGIR - I should have time to help ya! Ack, cool! I have a couple .stl files I've been working over, sorry, been really busy doing phone system cutovers and listening to people bitch about how much they hate the new phone systek (Asterisk)
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Jun 3, 2015 01:55
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CommieGIR posted:Ack, cool! I have a couple .stl files I've been working over, sorry, been really busy doing phone system cutovers and listening to people bitch about how much they hate the new phone systek (Asterisk) NOPE Party Alarm fucked around with this message at 05:31 on Jun 3, 2015 |
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Jun 3, 2015 02:13
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Witchcraft happens, and you go faster, and you really didn't want to: the 2005 Toyota Camry's electronic throttle had terrible software. http://www.safetyresearch.net/Library/BarrSlides_FINAL_SCRUBBED.pdfquote:Toyota failed to exercise a safe standard of care for software
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Jun 3, 2015 02:53
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Cocoa Crispies posted:Witchcraft happens, and you go faster, and you really didn't want to: the 2005 Toyota Camry's electronic throttle had terrible software. http://www.safetyresearch.net/Library/BarrSlides_FINAL_SCRUBBED.pdf Let's be honest here: whose safety critical embedded code doesn't have over 10,000 global variables and rely on uncontrolled, untested recursion to handle closed-loop DBW gas pedal operation?
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Jun 3, 2015 05:04
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But Toyota's software haven't actually killed or injured anyone, have they? All the casualties reported were due to floormats? Unlike the ignition switches of a certain other company?
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Jun 3, 2015 05:13
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The thing that really fucks me up about that is that none of these people who experienced unintended acceleration, whatever the cause may be, thought to take the gorram transmission out of gear. Do people really know that little about their vehicles? Its important to know how to operate a thing that could kill you in many interesting ways correctly. Someone else here said that people use park, reverse, and drive and have no clue about the rest. N is for Neutral, Fuckers! If it won't quit going smack the fucker out of gear and let the engine spin itself into shrapnel. Definitely preferable to hauling rear end into a wall. It's not doing what you want then  until it does! FFS!
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Jun 3, 2015 08:54
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Slam it into reverse to stop even faster It always worked in GTA
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Jun 3, 2015 09:27
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Vanagoon posted:The thing that really fucks me up about that is that none of these people who experienced unintended acceleration, whatever the cause may be, thought to take the gorram transmission out of gear. n is for that gear between back up and go that never seems to work
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Jun 3, 2015 10:35
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atomicthumbs posted:n is for that gear between back up and go that never seems to work Put it in H! http://www.dula.tv/watch.php?file=homer-buys-car-from-crazy-vaclavs.flv
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Jun 3, 2015 10:49
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Vanagoon posted:The thing that really fucks me up about that is that none of these people who experienced unintended acceleration, whatever the cause may be, thought to take the gorram transmission out of gear. That was the other dumb piece of software, the driver I read about was hitting the engine start/stop button over and over and over, but it was programmed to only stop the engine if you hold it down for 3 seconds. In a panic situation who has the patience to do ANYTHING for 3 seconds? But yeah, neutral.
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Jun 3, 2015 18:09
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freelop posted:Slam it into reverse to stop even faster As a piece of technical advice: if you slam your car into P from D at highway speed, you now have two settings for N.
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Jun 3, 2015 18:37
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Has anyone ever tried to tune a gas motor like a turbo diesel ? 18:1 compression, 30lb boost, 3000rpm rev limit, valve timing to match...
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Jun 7, 2015 06:36
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jonathan posted:Has anyone ever tried to tune a gas motor like a turbo diesel ? Not with boost as you'd need an insane octane rating even with direct injection, but NASCAR engines among other have run diesel-like compression ratios in the 18:1 region. Pre-ignition is the issue with the high compression ratio, regardless of boost/rev limit/etc.
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Jun 7, 2015 07:14
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Yeah pro stock motors are up there in compression. So can gasolene just not be kept from preignition under those conditions ?
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Jun 7, 2015 07:19
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jonathan posted:Has anyone ever tried to tune a gas motor like a turbo diesel ? They clearly aren't going quite that far, but isn't that the line of thought behind the Mazda Skyactiv engines - especially the high-octane-requiring versions they use outside the US?
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Jun 7, 2015 07:31
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