Functional Differential Gear System
Description
For more info see auto.howstuffworks.com/differential1.htm
Instructions
2)Assemble Casing
3)Attach Input Pinion to Stand
4)Attach Casing to Stand
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Would you please post the hardware needed again? The thingiverse website update did away with your part list and screw size.
thanks
Has anyone had problems with the side plate hole being too small?
How have you guys printed the Shaft?
Also Thing-O-Fun, if you're going to do any updates to this, could you maybe give the stand rounded ends instead of corners to reduce warp for those of us not using HBP?
I added Stand3.stl which is a copy of Stand.stl with mouse ears at the corners to help with warp. The current ears are set at 6mm diameter with a thickness of 1mm.
The shaft should be printed in the orientation I have shown. If you do not have a HBP you might want to print this component with a raft to ensure that it does not move during printing.
Any suggestion how to set GCode to print the shaft with correct cylinder inside ?I always get an oval :( - TOM MK7, 0.4mm nozzle, fill 1.75mm, GEN4, firmware 3.0 - SF 35 Thingomatic-ABP-MK7.
It sounds to me like you may need to review your bots axis calibrations, belt tension and speed settings. One of your two axis could be traveling further than the other which would cause an oval pattern to be printed rather than a circular pattern. Also, if your belt tension is not optimal you could end up with excess slop in one direction or the other when switching directions. The speed used could also influence this. There are many good tutorials (as well as schools of thought on doing it correctly) available online and in the makerbot forums.
I verified the file to be correct and should result in a circular pattern. Hopefully this helps.
I give up... I have tried and tried to print the small gears and have had no luck. What is the trick to stop them from curling up and looking like crap. I have tried teeth up and teeth down. No luck... slow fast hot cold... help! The large Casing gear came out perfect. :'(
Uploaded gears without back cut. Haven't printed these myself but there look to be no interference issues on the assembly. Hopefully these help.
Looks like RonG has you covered. Check out his version and maybe it will help. I'll see if I can put up some files that don't have an angled back cut.
Has anyone successfully printed this on a Cupcake (Gen3/mk6, specifically)? Wondering if I should attempt it.
Bill
Yes, definitely it can be printed with CupCake just fine. I printed it with CupCake Gen3
&
amp; MK5 (DC) and it works great ! More photos from http://www.flickr.com/photos/y...
I printed it in Glow In The Dark - it's quite industrial looking thing when in the dark :)
It's on my list. Should be able to start with it this week now that I have RobG's new ugly cable hack in place on my Gen3 board. I'll post back and let you know how it goes (if you don't start before I get done :) )
Just printed it. Thanks for uploading the design.
Just a few notes on possible improvements.
Tolerances are rather loose and the shafts need a busing/ washers for it to run nicely, as the spider gears wont mesh fully without washers pushing the two axle gears in.
The main shaft gear needs to be better supported if you plan to run it at speed (i
did with a cordless drill) as it is currently unbalanced, a flange would work.
An additional spider gear is needed in the schematics. Although most depictions of the differential only has one spider gear, in production differentials, there's 2 to spread the load.
Thanks for printing and posting :)
I think you will find the tolerances loose if you have a higher tuned bot than I do. I based the clearances and tolerances off of the results I got from printing various elements (columns, holes, gear teeth, etc) that all relate back to how repeatable and precise the printer is. Unfortunately I am a little bit impatient so I also run my bot a bit faster than I probably should which doesn't help things. ;)
I found the tolerances to be very good on my print. I used two spider gears rather than just one as is shown. The mesh is very good on all gears. I did have to do some sanding to enable them to move freely.
Hmm, openscad does not want to import them.
Can you put them in the correct direction for printing? ie facing down
This works well. The handles were a very tight fit, and didn't need bolts! Thanks.
Am I missing something or are most of these upside down or on their side?
can you post an stl of the Differential fully assembled?
thank you!
It's almost perfect!!, you only need to share the source code, and then it will be really perfect! :-P
I'm not having success generating Gcode for the stand. RepG gives tons of errors. Tried many times, ran through NetFabb, edited in SketchUp, rebooted, and still I cannot get it to work. Aside from redrawing it, I am out of ideas.
Is it just me?
From what I can tell, this is a warning more than an error. I have gotten these errors before on other items I have designed. Being the originator and having more faith in the native modeling software (SolidWorks) than I do in RepG I was willing to push on through it. I totally understand not wanting to start a multi-hour print from a file with warnings in it, I will watch more closely for this in the future. I tired exporting again with some different settings and RepG still threw some errors. I found that RepG doesn't like the rib features so I uploaded a file with them removed. The original file worked for me but it did throw up warnings. This new file generated for me in RepG without issues.
Hope this helps.
will it fit in the turtle shell racer?
I am not sure, the casing is currently 81mm in diameter so it is quite large. During my experimentation, getting correctly formed teeth on a bevel gear with a metric module less than 2mm was difficult for my printer and having fewer teeth than 13 on a pinion would start to result in binding due to undercut issues. Long story short, its big. :)
Beautiful. This is going on my desk, and may be even more played with by visitors than the corner cubes.
Three very impressive designs, in double quick time and nicely printed too! I look forward to the next... :)
License
More from Thing-O-Fun
where does the m3x12 go? Cant seem to find the location on the exploded view
I built one. The TWO m3x12's (or you could use m3x10's) are used on the two spider gears.
Wish I could help, but I was wondering the same thing. Also, I only count 15 screws used in the drawing, but the part list shows 16 - m3x16mm. Now we have two unaccounted for. lol
I'm still going to print this thing. I'm sure it will become obvious if a shorter screw is needed.