Roll on the 20th June

[Rusty_Springs]

Hi Graham,

thanks for the info, I will check it out and see if I can find the test on u tube.
You seem to have a strong knowledge of magnets, so from what you are saying, if i take two 10lb pull force magnets, and put them together, it should take 20lbs to pull them apart. correct?
then if i try the same test with repel, I should find that it takes 20lbs to push them together. correct?

take care Graham
Dirt

Yes dirt I do know magnets remember as far as I know I'm the only person to show two working permanent magnetic gates, the only person I have seen that has made one is Johnson and he had to shape his magnets to do it.
Your test is flawed for one reason a thing called a magnetic bond which you only get with attracting magnets, the test I said shows there about the same because the reason a piece of paper will part the attracting magnet is they do not have that magnetic bond and they do not have that bond because the repel on the other side is strong enoth to stop the bond happening.
If the bond is there yes its hard to pull the magnets apart but if its not there then they can be parted with the force of a piece of paper or a feather as Butch shows.
Take Care Dirt
Graham

[exxcomm0n]

@ Exx.

i went with Brass rods instead of 'All-Thread',  i decided it was best to keep the magnetic attraction to a minumum. im not sure yet how far the magnets on the rods will sit from the bearings.
But i didnt want that to be an issue. 

@ Smoky

Depending on sizes, you might have gotten away with using nylon too.

But good call on the reactivity.

Careful of how close they are to mags though as I hear tell that they (copper, brass, bronze, aluminum, etc.) can warp your field too.

If you're now going w/ the split rod design (this means double the linear bearing assemblies), I'd place the mounts at the end of rod travel on either side for the best compromise between support and strength.

How are you going to keep them (rods) in the bearing run?

Bell-type flange?

Like:

                                       ________
                                       |  mag  |
                                       |           |
                                       -------------
                                            |  |
                                  _______|_|_______
                                     -     Bell     -
                                       `-   |  |  -`
                                          `-|  |-`
                                             |  |
                Rod   ------------>     |  |



Just curious.........................................

EDIT
You could probably mill it out of some nylon really quick.

Cutting boards are WONDERFUL materials!

[ramset]

JOHN you need to chill with the coolaid   pure power this isn't about you     I don't know if any of you have been in a place where you had to hire a man on a big prodject     to do some thing important to that prodject    I have    on the biggest prodjects in the world    and ARCHER rings true   Chet

[dirt diggler]

Yes dirt I do know magnets remember as far as I know I'm the only person to show two working permanent magnetic gates, the only person I have seen that has made one is Johnson and he had to shape his magnets to do it.
Your test is flawed for one reason a thing called a magnetic bond which you only get with attracting magnets, the test I said shows there about the same because the reason a piece of paper will part the attracting magnet is they do not have that magnetic bond and they do not have that bond because the repel on the other side is strong enoth to stop the bond happening.
If the bond is there yes its hard to pull the magnets apart but if its not there then they can be parted with the force of a piece of paper or a feather as Butch shows.
Take Care Dirt
Graham

Graham,

Thanks for sticking with me and helping me understand.  I understand now what you are saying, yes that makes perfect sense.

ciao,  Dirt

[Rusty_Springs]

Graham,

Thanks for sticking with me and helping me understand.  I understand now what you are saying, yes that makes perfect sense.

ciao,  Dirt

Hi Dirt
No worries mate I'm glade your like me and willing to listen to someone you feel may know more about the subject then you like I did with the planes, you showed me something I didn't know there and I appreciated it.
Take Care Dirt
Graham