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MattC9 18-05-2011 23:23

pic: A little CAD practice
 

Hawiian Cadder 18-05-2011 23:24

Re: pic: A little CAD practice
 
why make the wheel base so short?

steelerborn 18-05-2011 23:27

Re: pic: A little CAD practice
 
Do you have any tensioning plans on the outside wheels? I can't really tell, but that is important. It looks very nice, everyone always gets better after the season is over, keep it up.

MattC9 19-05-2011 00:14

Re: pic: A little CAD practice
 
Quote:

Originally Posted by Hawiian Cadder (Post 1062395)
why make the wheel base so short?

It's 37in?

MattC9 19-05-2011 00:15

Re: pic: A little CAD practice
 
Quote:

Originally Posted by steelerborn (Post 1062398)
Do you have any tensioning plans on the outside wheels? I can't really tell, but that is important. It looks very nice, everyone always gets better after the season is over, keep it up.

Yes but I donut know how I should go about it, have any ideas?

Akash Rastogi 19-05-2011 00:24

Re: pic: A little CAD practice
 
Quote:

Originally Posted by MattC9 (Post 1062409)
It's 37in?

With smaller wheels, you can distance your wheels more, giving you a longer wheelbase. Note: wheelbase in this case is distance between wheels, not overall length of the drive.

MattC9 19-05-2011 00:30

Re: pic: A little CAD practice
 
Quote:

Originally Posted by Akash Rastogi (Post 1062411)
With smaller wheels, you can distance your wheels more, giving you a longer wheelbase. Note: wheelbase is distance between wheels, not overall length of the drive.

Ahhhh ok, Sorry i was a little confused at first, but ill put it on my todo list.

PAR_WIG1350 19-05-2011 00:41

Re: pic: A little CAD practice
 
Quote:

Originally Posted by MattC9 (Post 1062410)
Yes but I donut know how I should go about it, have any ideas?

Floating tensioner (2 lexan strips + 2 bolts+ 2 nylon spacer/rollers)

Al Skierkiewicz 19-05-2011 07:53

Re: pic: A little CAD practice
 
Matt,
Nice drawing. Now time to add some holes for mounting bumpers and add bumper supports between the wheels.

Joey P 19-05-2011 08:11

Re: pic: A little CAD practice
 
Nice Chassis drawing. I am also the leader of CAD on my team. I have seen an improvement on my skills from start of the season to the end. Now, just add more to it. the wheel size is interesting. I have hardly seen small wheels like that on the past robots, but it seems to be a good idea. Keep going.

Jared Russell 19-05-2011 08:12

Re: pic: A little CAD practice
 
Since you are already making bearing plates, it wouldn't be too difficult to slot their mounts in the frame rails and make a true "West Coast Drive" tensioner. Loosen mounting hardware, slide bearing block until chain/belt is tight, re-tighten (works even better with cam bolts or some sort of lead-screw to help keep the block in place once tensioned).

akoscielski3 19-05-2011 11:32

Re: pic: A little CAD practice
 
My team has never made a chassis that has the wheels on the other side of the frame. I was wondering how you do this? Is it using a hex shaft or what? Could you possibly explain all of this or maybe put up a CAD design to download or even a close up picture. That way i could see how it works and maybe use a drivetrain like this in the future.

Thanks :)

steelerborn 20-05-2011 01:33

Re: pic: A little CAD practice
 
There are a lot of great tensioning systems you could use. Obviously the easiest set-up would be just adding the kop tensioning system. But interesting systems are also around you could look at cam tension systems for the outside wheels. Making the center wheel direct driven would allow only the outside wheels that would need tensioning. I came up with a lot of crazy systems that would all yield the same result. My favorite one used surgical tubing to move the outside wheels farther out. In the end there is no true answer but a endless supply of them. You have all summer, I would say to experiment a little and find a unique solution that is your design. Keep it up.

MattC9 20-05-2011 15:23

Re: pic: A little CAD practice
 
Quote:

Originally Posted by steelerborn (Post 1062652)
There are a lot of great tensioning systems you could use. Obviously the easiest set-up would be just adding the kop tensioning system. But interesting systems are also around you could look at cam tension systems for the outside wheels. Making the center wheel direct driven would allow only the outside wheels that would need tensioning. I came up with a lot of crazy systems that would all yield the same result. My favorite one used surgical tubing to move the outside wheels farther out. In the end there is no true answer but a endless supply of them. You have all summer, I would say to experiment a little and find a unique solution that is your design. Keep it up.

Stupid question, Theres a KoP tensioning system? because if there is, I would be a very happy man.

Quote:

Originally Posted by akoscielski3 (Post 1062492)
My team has never made a chassis that has the wheels on the other side of the frame. I was wondering how you do this? Is it using a hex shaft or what? Could you possibly explain all of this or maybe put up a CAD design to download or even a close up picture. That way i could see how it works and maybe use a drivetrain like this in the future.

Thanks

I used a 1/8keyed shaft in the picture and I put an E-clip on the end of the wheel to keep it in place.

Do you still want up close pictures?

akoscielski3 20-05-2011 16:25

Re: pic: A little CAD practice
 
Quote:

Originally Posted by MattC9 (Post 1062757)

I used a 1/8 keyed shaft in the picture and I put an E-clip on the end of the wheel to keep it in place.

Do you still want up close pictures?

I actually was thinking of it while sleeping... and noticed that u can use the key slots. Is everything key slot or no. Also how do you make the slot for the E-clip, is it just done on the lathe?

And is the only thing holding the shaft straight the brace on the side of the tubing + the tube?


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