View Full Version : Magnetic Minibots and How You Can Do it Too
Akash Rastogi
29-03-2011, 15:25
Hi CD,
So the company that we bought our magnets from for 3553 was gracious enough to post some valuable information about the use of magnets on minibots.
This thread is for those of you concerned about teaching students the physics behind these minibots. Well, here ya go. Enjoy and I hope the students learn something from this. :)
http://www.kjmagnetics.com/blog.asp?p=pole-climbing-robot
This is a great Philadelphia company, and we thank them for their cooperation and guidance during our testing/experiment process.
Thank you again K&J Magnetics!
billbo911
29-03-2011, 15:42
Nice article. What a great way for a vendor to work directly with us on a very specific application!
Brandon Holley
29-03-2011, 16:06
I saw this article a couple of days ago on their site, but forgot to post it up on delphi.
We ordered our magnets from here. They are a great company.
-Brando
Akash Rastogi
29-03-2011, 16:42
I saw this article a couple of days ago on their site, but forgot to post it up on delphi.
We ordered our magnets from here. They are a great company.
-Brando
Brandon,
Which ones did you end up purchasing? Just curious.
Yes, they were very responsive to our needs. We ended up using these.
http://www.kjmagnetics.com/proddetail.asp?prod=BX088DCS&cat=173
After experimenting with them we ended up not needing magnets in our minimalist final design.
Justin Montois
29-03-2011, 18:13
That is a great article. That's where we got our magnets from as well. Great company.
Patrick Seeney
29-03-2011, 18:48
Excellent article...we are using magnets from this company as well, but not the same as everyone else. This company has excellent turn around for shipping the magnets.
We didn't actually order our parts from the company but that site just helped us finish our minibot!
Any of you going to the MI Troy competition will see, like the Las Guerrillas.
nlknauss
29-03-2011, 21:06
Great article! Thanks for sharing this resource. I'm looking forward to seeing 3553's robot in action at Philadelphia.
Nate
We ordered from this company too.
We at first ordered 4 magnets. they came all together in one giant bundle with 1/8in plastic spacers in between them. One of our mentors wasn't careful when trying to pry them apart and immediately snapped one into three pieces as they smacked into each other. Woops.
I made the same mistake about 5 minutes after. So, we had two complete magnets to work with.
They do their job very well for our minibot.
We placed an order for another 6 the other day and asked for each magnet to be individually packaged and wrapped. They obliged (for no extra fee, I think). Each magnet came wrapped with some sort of packing wrap (?) and could not attract each other through the wraps. Which is a very good thing.
TL;DR: When handling neodymium magnets, be very careful, and don't let them accelerate into each other. Ask them to individually package your magnets too!
This year many teams have focused on KJM magnetics to stick the mini bot on the pole. Magnets can have other uses on our robots. Some times teams have a device that can lock up, jam, or bind resulting in a broken gear train or smoked motor. Take some KJM magnets, add some design creativity and you can have a very cheap and effective magnetic slip clutch. Why would a magnetic slip clutch be better than a classic friction clutch? Keep this thought in your back pocket for future years.
Brandon Holley
30-03-2011, 09:09
Brandon,
Which ones did you end up purchasing? Just curious.
Just saw this, sorry for the delay.
I'll PM you the link.
-Brando
I thought I would let the folks at K&J know they were getting kudos from the CD community, here is there response....
Excellent! We've had a lot of fun answering questions for students and mentors alike, and putting together that post. The only thing I'm sorry about is not building one of our own! I might have to look into mentoring next year myself.
It's especially fun to be emailing about concepts that I've seen professional engineers still working on. Describe the problem theoretically first, prototype fast, quicker iterations mean more chances for improvement, design in flexibility for adjustment, especially in the face of tight deadlines. Whether or not these kids get into engineering, what a great, hands-on lesson in critical thinking.
Best Regards,
Michael Colalillo
K&J Magnetics, Inc.
www.kjmagnetics.com
Based on their area code, I think they are near Philadelphia, so I invited them to the Philly regional next week. So keep an eye out for some folks looking closely at the magnets on your minibots :)
Akash Rastogi
30-03-2011, 11:01
I thought I would let the folks at K&J know they were getting kudos from the CD community, here is there response....
Based on their area code, I think they are near Philadelphia, so I invited them to the Philly regional next week. So keep an eye out for some folks looking closely at the magnets on your minibots :)
Wow what an awesome response! I will make sure I stay in touch with Michael and see if he would like to work with 3553! Thank you Richard.
Sovietmagician
06-04-2011, 11:34
Team 694 also decided to go with magnets from KJM to make their Minibot. A team at the New York city regional told me about K&J and I immediately checked them out and ordered magnets. I wish had seen this article earlier, its got loads of really helpful information. I always love it when companies get into the FRC spirit.
-Ariel
Tristan Lall
06-04-2011, 12:23
Just to add another vote of confidence: I used several magnets from K&J in 2006 for an industrial application, and enjoyed good service from them.
It's good to see them collaborating with FIRST teams in this way.
Steven Donow
06-04-2011, 13:38
223 is using these on our minibot(I believe they were also used on our minibot at NJ too...) and they work great. Hope to see them at PHilly these weekend, I know one of our mentors emailed them about it.
Did anyone browse through the different magnets they have? I noticed the 4"x4"x2" block that has over 1200 pounds of pull. How the heck do they ship that thing? If it gets anywhere close to the side of the ups truck it's never coming off!:yikes:
Did anyone browse through the different magnets they have? I noticed the 4"x4"x2" block that has over 1200 pounds of pull. How the heck do they ship that thing? If it gets anywhere close to the side of the ups truck it's never coming off!:yikes:
The home delivery UPS truck bodies and shelves are made of Aluminum, so no worries there. Now walking it out of the truck the door latch is steel. Not to mention the sorting equipment, fork lifts ect along the way.
Chris is me
07-04-2011, 11:47
Did anyone browse through the different magnets they have? I noticed the 4"x4"x2" block that has over 1200 pounds of pull. How the heck do they ship that thing? If it gets anywhere close to the side of the ups truck it's never coming off!:yikes:
1200 pound magnetic pull is a safety hazard and no one should seriously consider ordering it. Imagine if your hand was in between the magnet and some metal. Yeah...
Did anyone browse through the different magnets they have? I noticed the 4"x4"x2" block that has over 1200 pounds of pull. How the heck do they ship that thing? If it gets anywhere close to the side of the ups truck it's never coming off!:yikes:
I would imagine they just put it in the center of a big box (http://www.kjmagnetics.com/prodimages/BZX0ZX0Y0-N52L.jpg).
Magnetic force drops off very rapidly with distance (http://www.kjmagnetics.com/largergraph.asp?CI=1&pName=BZX0ZX0Y0-N52).
vBulletin® v3.6.4, Copyright ©2000-2017, Jelsoft Enterprises Ltd.