Team 2062 Teaser #1

[Sunshine]

Team 2062 Teaser #1

We entered the world of CNC milling this year
We are proud of what the students learned by designing and fabricating these parts that will be used on our robot.

Can you guess what 2 of them will be used for?

[nighterfighter]

Looks nice. Was it a 3 axis mill or more?

Also did the kids do the gcode by hand or use a CAD program?

[NorviewsVeteran]

It looks like you got yourself some chassis rails with integrated gearboxes, and two for a secondary bot.

Unless you're going to have a flippable robot with 4 wheels on top and 4 on the bottom.

[2611.Shooter]

Or just a chassis with walls on both sides of the wheels, as we have done for the last 3 years. Makes for a much more durable (and impact-friendly) chassis, but makes swapping the wheels a major pain. Good for a very solid robot.

[mike_dbdesigns]

Looks nice, must have been fun to deburr

[Alex Cormier]

Hmm. Possible using mecanum this year. and the others are for a practice bot?

[Sunshine]

WOW!

You guys are amazing (but I should not be surprised)
You nailed it collectively in less than 2 hours

Yes, they are chassis rails with integrated gearboxes.

No fancy CNC machining. Exported student Inventor files as stp. files to Master Cam and used a Techno CNC router as the mill. I was amazed in the accuracy and my only concern was how slow the process was. But the kids hung in there and learned a great deal.

And yes we are:
Using mecanum this year (how did you ever get that from the picture?)
…… and 2 rails are for a practice bot (another first for us)
……. and a big yes to having fun at all of the deburring

[Dr Theta]

Are you cantilevering the mecanums?

[Brandon Holley]

Originally Posted by Sunshine

And yes we are:
Using mecanum this year (how did you ever get that from the picture?)

I only see spots for a total of 4 wheels, so either your going with a 4 wheel long orientation setup (which is usually problematic with turning issues etc.) or you are going with mecanum, which has been a hot trend the past few seasons.

Looks good! Keep it up.

-Brando

[Sunshine]

Originally Posted by Dr Theta

Are you cantilevering the mecanums?

What you see will be the inner rail system. We will be using ITEM as an outside support system for various things

[Bruceb]

What kind of router bit did you use. What was your RPM? What was your depth of cut? What was your travel speed? Did you use a ramp entry?
Thanks
Bruce

[Dr Theta]

Ah, I really didn't expect you to. Anyway it looks good I hope I can get a good look at it at 10000 lakes. (Hopefully we won't see it that often on the opposing side of the field ) In all seriousness we enjoy competing with you guys no matter which side of the field you're on, C.O.R.E. 2062 is just an all around awesome FIRST team.

[Sunshine]

Originally Posted by Bruceb

What kind of router bit did you use. What was your RPM? What was your depth of cut? What was your travel speed? Did you use a ramp entry?
Thanks
Bruce

We discovered that a 1/4"- 4 flute flat mill bit worked best for the larger cutouts. And a 1/8"-2 flute for smaller cutouts.

The slowest we could get the router down to was 10,000 rpm. This was not a problem for the 1/8" bit (we calculated 9600 rpm as best) but it did cause us to slow down the feed rates while using the 1/4" bit (went through a couple of bits while we used trial and error)

We always used a plunge rate (z axis) ½ the Feed rate
We played with feed rates between 6-20" per minute. We concluded that a feed rate of 10 was about right for the 1/4" bit. We will continue to play with 1/8" bits to determine optimum speed. I'd say start at 10 and work your way up listening for chatter and aluminum loading up on bit.

We made 4 depth of cuts to get through the aluminum with finish cut at .010. The finish cut was not really cutting any depth but helped with burrs.

Not sure what you mean by ramp entry?

Hope this helps

[Sunshine]

Thanks for the compliment Derek. It is greatly appreciated. I'll pass it on to the students.