hey i got a rare earth magnet from radio shack the 1/8 " one-what size hole do i drill and how do you lock it in .My guess was to use a smaller drill bit and hand file it till it just barely fits in then use lock tite bearing and sleeve formula to secure it.I wanted to see what everyone thinks about doing it this way.The only problem i see is that the magnet is really thin-does anybody have a favorite way to do this? than x

Make sure the polarity is right...use a compass...drill the hole with a kinda worn drill...in an out real quick. Use loctite and tap magnet in hole. There are more ways if you do not like that one....

now now captn be serious that sounds like it wont do-worn drill bit?

A worn out drill bit won't drill a clean hole. Use a sharp one, but a small amount under the diameter of the magnet, eg, .003 under since the drill will probably drill a little oversize in metal. Remember, you can always make the hole larger in diameter, but it is impossible to shrink it. Try drilling a test hole all the way thru a flat plate to see if it is the right diameter to hold the magnet. If you don't drill it all the way thru, you won't be able to push the magnet out again.

Nearly all Hall-effect switches are configured to switch on with a positive magnetic field. The positive field is associated with a magnetic south pole.

thank you i have some flat aluminum i can "practice" on-and the locktite will do?

Drill first with a smaller size.... then actual hole size. If you not carefull you will oversize ...(aluminum drills very easy) ...use a micrometer and measure the drill (not worn out...just a little undersize one). Or just do it you own way P.S. all 1/8 inch drills are not .125 some are bigger....some are smaller....mike them and see. NOTE...This is for a tight fit, like a press fit and using locktite. If you want to use JB weld...you need more room for it.

I usually drill the hole a touch larger than the magnet by a few thousandths, to allow room for the glue. Then I clean the hole and the magnet with acetone, and JB Weld the magnet in place. Never had one come out yet....

AV8TOR

Hey Mark
I have a .001 undersized reamer I will loan you if you need it
Ivy McNeil

OK magnet is in - like i thought it would be ok from everyones help here.I even started the echo 1.3 fpe clone i am converting-DANG now i gotta start a new thread!!!LOL

now that the magnet is in, make three or four punch marks around the circumference to lock the magnet in place. "belts and braces" system, so you will not loose the magnet when the collar gets hot.

By the way...what brand of ignition are you did you use? Is this engine for a airplane or a boat? Best Regards, Capt,n

It is for airplane use-have'nt desided what to put it in-any sugestions?-and the ignition is a crrc pro 26 stock ignition and sensor.Works real good i must say.