subsearobot
Mechanical
- Jan 19, 2007
- 217
Howdy folks
I have a simple (but not so) problem. We are in production with a solution that is not ideal. We need to attach a small magnet (diam.100"+/- .002, cylindrical) to the end of a stainless rod (.050"+/-.000005, seriously).
the solution that the previous engineer went with was to machine a brass socket, where the rod presses in one end, and the magnet is glued into the other end. problem being the magnets are highly polished and dont adhere well, and that gluing in production is not ideal for several other reasons.
we want to press fit the magnets also, using plastic for the socket. the difficulty is that with the magnets tolerance, I am having trouble finding a plastic that will not yield at the worst case tolerances. we are not doing volumes that would justify molding these parts. of course, creep is also a concern.
so the question is: is there a machinable plastic I should look at that could handle ~.005" diametrical press fit at .100" while maintaining a hold on the magnet over time? UHMW looks good on paper, but I cant find any info on creep resistance, and knowing how "unstable" it is, I do not have warm fuzzies spec'ing it.
thanks!
I have a simple (but not so) problem. We are in production with a solution that is not ideal. We need to attach a small magnet (diam.100"+/- .002, cylindrical) to the end of a stainless rod (.050"+/-.000005, seriously).
the solution that the previous engineer went with was to machine a brass socket, where the rod presses in one end, and the magnet is glued into the other end. problem being the magnets are highly polished and dont adhere well, and that gluing in production is not ideal for several other reasons.
we want to press fit the magnets also, using plastic for the socket. the difficulty is that with the magnets tolerance, I am having trouble finding a plastic that will not yield at the worst case tolerances. we are not doing volumes that would justify molding these parts. of course, creep is also a concern.
so the question is: is there a machinable plastic I should look at that could handle ~.005" diametrical press fit at .100" while maintaining a hold on the magnet over time? UHMW looks good on paper, but I cant find any info on creep resistance, and knowing how "unstable" it is, I do not have warm fuzzies spec'ing it.
thanks!
