Was gone for most of the day today after posting this last night and was very shocked to see how popular this was. I am first going to 3D printing, all of that discussion was all for not because my team does not even have access to 3D printing and would be cheaper to mill one in house then to pay to have one printed. Now to asid61's questions
Quote:
1. What is the final weight of this gearbox without motors?
2. What is your reasoning for going with a bevel gear setup?
3. What advantages does this design hold over 192's gearbox design from 2014? I still haven't seen a shifting gearbox design that beats theirs in terms of weight or size.
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1. I currently do not know how to calculate weight in Inventor but I am sure after a quick google search I will figure it out and get back to you on that one. The plates are 0.25" alum if that helps.
2. We mount our electronics on the belly pan of our robot and constantly ran into issues because the motors were in the way. Also I started this team last year and a vast majority of the team is graduating this year including me. We are working to get a permanent workspace, machinery, etc. so we can establish a program that continues after the founding members leave. We want to create a robot this year that will set a standard for members that follow us that we strive for creativity (bevel drive) and quality custom. I know this can be done in an off season project, too much risk, etc but in the end it is our team and this is what the team wanted to do and that is what it comes down too. I know there are many reasons not to do it but think of what we will learn doing this! In the end it is not about a robot but what has been learned during the process of building the robot.
TL
R Nicer form factor and it is what the team wants to do
3. It does not, that is a BEAUTIFUL gearbox but it is not ours and this is the design fits much nicer in a drive base and works for us.
As for our issues with gear ratios what really stopped us from gearing it further down was I thought that 9fps was way to slow already but after being told that is pretty fast and we will have breaker trip issues I will play with the ratios more. I will shoot for 16fps High and 5fps Low. Also here is a link to a better picture of the bevel gear setup should answer some of your questions. The bevel on the CIM is bored and keyed for the CIM then just slides on but a retaining ring will be added but no thrust bearing. The other bevel has a bearing on its 0.75" hub but also has a 3/8" hex shaft that goes through its bore to the rest of the gears. Both don't have thrust bearings. Hope that all makes sense
http://i.imgur.com/Vbxs3Sb.jpg
There was a lot of questions and comments and I tried to cover them all but what I really want to hit on again is that this is what the team decided as best and we will be making one during the off season using in house CNC equipment. Please let me know if you have any more questions or comments.
EDIT:
The bevel gears are also lined up exactly to the manufacturer's specifications so they should mesh perfectly and are made of steel.