Chief Delphi - Minibot magnets ?

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Re: Minibot magnets ?

Quote:

Originally Posted by Ether (Post 1054194)

Here's a curve of K&J's 44 pound BY0X04-N52 magnet. At 1/16" (0.0625") it's only 2 pounds.

Could you post a part number for your magnet please.

You've read the chart incorrectly. At 0.6" it's 2 lbs, it's considerably stronger at 0.0625".

K&J offers a calculator online as well to help determine pull force based on magnet size and distance from the pole.

-Brando

Re: Minibot magnets ?

Quote:

Originally Posted by Ether (Post 1054194)

Here's a curve of K&J's 44 pound BY0X04-N52 magnet. At 1/16" (0.0625") it's only 2 pounds.

Could you post a part number for your magnet please.

McMaster-Carr Part Number: 7061T11

The magnet was spaced approximately .0625" away from the pole and was more than strong enough to hold our 2.3lb minibot on the pole, though I'd suggest decreasing the spacing to approximately .04" to make the attachment to the pole a little stronger, our minibot liked to fall off on it's way down - sure was fast though.

Re: Minibot magnets ?

Quote:

Originally Posted by Brandon Holley (Post 1054203)

You've read the chart incorrectly. At 0.6" it's 2 lbs, it's considerably stronger at 0.0625"

Yup, you're right. That's what I get for multitasking.

Re: Minibot magnets ?

Quote:

Originally Posted by jvriezen (Post 1053212)

Be careful about using hard drive magnets. If they are encased in some other material designed to mount it to the drive that isn't a legal mini-bot part, you might have trouble.

I believe I also read somewhere here early on in the season that technically using a hard drive magnet means you are using a COTS component (the entire hard drive or the device it came from) and then modifying it (stripping it down to just the magnets) and that technically is not allowed, because Hard Drives are not permitted on the mini-bot. I know it sounds weird, but if you want to be uber-safe, buy a magnet alone, rather than scavenging one out of something else. I doubt a nickel coating or other similar coating that comes with a COTS magnet would be an issue, just because its not entirely a magnet.

There is a chance approaching 1 in 4 that I'll be inspecting your mini bot in St. Louis. I'll be asking deferring to my LRI about questionable minibots, however, (especially if you ask me to!)

John Vriezen
Team 2530 "Inconceivable"
Mentor, Drive coach, Inspector

John,

The rules do not specify where the magnet comes from. Also, the GDC ruled on hard drive magnets specifically here.

Regards,

Mike