11-03-2014, 12:47 PM
I was just thinking about the Acme screw and nut set we made. Do you need to schedule a friend to come help with the installation of the knee onto the base? Does the new nut fit snugly into it's nesting place on the base?
It's going to be a delicate operation trying to get the thread started without damaging the thread start, given the size and weight of the components. I would advise putting a guide mark between the knee and the base as a "limit" when you get at least 1/2 the length of the nut engaged with the screw. That way you could avoid the kind of damage there was to the original by observing the marks if you ever needed to raise the knee very high. You could even put a steel block on each the base and knee that would act as a "mechanical limit" which would only be removed if it had to be disassembled again. (Though I'd hope you never have to do that.)
It's going to be a delicate operation trying to get the thread started without damaging the thread start, given the size and weight of the components. I would advise putting a guide mark between the knee and the base as a "limit" when you get at least 1/2 the length of the nut engaged with the screw. That way you could avoid the kind of damage there was to the original by observing the marks if you ever needed to raise the knee very high. You could even put a steel block on each the base and knee that would act as a "mechanical limit" which would only be removed if it had to be disassembled again. (Though I'd hope you never have to do that.)