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pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
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Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
Nice Inventor work! A+ for the gears and sprocket if you made them yourself?
Looks familar! ;) I would be interested in the drawings and would check them out for you. Coming from an experienced Ball Lock transmission team; this type of transmission is a winner! Shift any transmission once your hooked; shift a Ball Lock twice and you will never turn back! Any idea how your side plates are going to look and what tooth count are your gears? Now that you have the hard work done, get those machines running! One thing that could shed some wieght would be to get hubless gears or machine those hubs off. |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
looks great! congrats. I was curious from both you and anyone from 222 that reads this.
1) how do you cut the grooves for the balls? do you just use an end mill or do you get them wire EDMed. 2) What kind of tolerance do you need to hold on the shafts and gear cuts to make the system sloppy (reduced torque transmission)? |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
The designs for the transmission can be found at http://www.nrg948.org/pr/2 Speed Ball Gearbox_0.2.zip, feel free to download them and look them over. They were made in Inventor 6, but I believe the newer versions shouldn't have too much of a problem opening the files...
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-Jake |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
that looks awesome!
we've been discussing the idea of a ball-lock shifting transmission, and everything is just so great about it. |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
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Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
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So your saying dogs don't wear on the gears either? Milling the four slots into the gears with a mill bit is easy. Slap the bored out gear on the mill vise, dial indicate it on center, move the table to each slot, and your done. (If you have a digital readout lucky you!) We do not have access to this wire EDM you speak of! These transmission can be built with a mill and lathe. The tolerance is usually about 4-5 thousands. In other words, if your shaft was 1.000'' you would bore the gear diameter out to 1.004'' I do believe we have made that gap as much as .01'' |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
I never would have thought of having a 2-speed for shooting. That is very creative!!! Great job on the inventor there! I am new to inventor myself... learning quite quickly... hopefully I can something that kool one day haha. But I am very impressed!!!
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Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
This looks good. Keep up the good work.
I have to agree with the weight issue. Also once you have the hubs off you could put them a lot closer together making the box thiner. I do not think there is more friction on ball bearing shifters than there is on a dog shifter. Also a ball bearing shifter can be made oil filled inside the shaft. I also designed a Ball Bearing Shifter that is currently being manufactured. Once is done I will post pics along with a white paper. Thanks to Team 222 for the idea. |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
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Who said this was for the shooter? :confused: |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
Be wary, you must machine everything perfectly, otherwise it will shred itself. 114 built one of these last year, and had far too much fun with it, until we realized we had no weight for the pneumatics. However, during the offseason, this is a great shifting system. I encourage you to keep playing with the design.
Another tip is on the shifting plunger, you may want to mount springs on the part that forces the balls out, to reduce wear on the part. This is due to the fact that it needs to be able to lag until the balls line up with the grooves in the gear. Good luck, and I highly reccomend this type of drive system! |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
I was looking at the Inventor files and it shows the shaft that is connected to the piston and the piece that pushes the bearings as two separate pieces. However it shows that the shaft that goes to the piston has a recessed and the piece that pushes the bearings has an ID equal to the diameter of the recessed. I hope that is understandable.
Anyway my question is how are you going to insert one in the other? |
Re: pic: Team 948 2-Speed Ball-Shifting Gearbox CAD Drawing
So, just to make sure I understand the concept--the piston moves the larger piece inside the output shaft, which forces the balls out into the gears, engaging the gear?
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