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Originally Posted by Jonathanb
Thanks for the tips everyone!  |
BTW the Inventor Van Door model in the FIRST CAD Library does NOT match the motor we were given this year perfectly. The bolt holes and output shaft are correct but many of the other exterior details are not.
In many cases, what is there is "good enough". But if you are planning for a tight fit (like I am) you should be aware there is a difference. A manual check with the real motor is in order.
It looks like the FIRST CAD Library drawing (01/24/04 version) is recycled from a previous year's motor. That's fine most of the time and 90% of people probably won't notice the difference. Personally, I'm using the FIRST CAD 2003 model and making allowances for known differences. The biggest one for me is the flange around where the motor meets the gearbox that is not in the model. None of the other differences are likely to cause an interference issue for me so I can ignore them.
I am VERY apreciative of having ANY sort of model ready made, at least as a starting point. Especially on something as complex to draw as the Van Door motor. But we got burned big time last year when I didn't notice an interference in the CAD model of our robot.(I didn't even spot it until this year!, and here I spent all year thinking there was an inaccuracy in the model. My apologies Ed!). So I'm a little paranoid about checking the conformance between the CAD model and real life.
FIRST CAD Library is a valuable resource and would be greatly missed if it wasn't there. But nothing made by man is ever perfect and this is one of those minor imperfections.
ChrisH