Hi,
I want to draw a steel ring along on two leadscrews, traveling linearly in the direction of a diameter (not in the direction of the axis). The ring is 6.625" OD and 6.065" ID. Given limits of space in the part, I've decided to use two 3/8"-12 acme coupling nuts, which seem only to come as hex nuts. I will mount the ring on the mill, and bore two "shelves" for the nuts to rest in, so that they will be parallel on opposing sides of the diameter of the ring.
So, I will have a steel ring with two little semicircular-bottomed pockets drilled into opposite sides, oriented just like the tapped hole drilled in a shaft collar. I need to secure the coupling nuts into these pockets, and pretty close to parallel or the leadscrews, turned in sync, will bind.
WILL humble epoxy hold well enough? The forces on this should not be so very great.
If not, can I weld it? If I lay the hex coupling nut into the circular pocket and use a mig welder, will it stay pretty neat, or will the heat harm the acme threads inside the nut or significantly affect the tolerance of the ring itself? Granted-- the ring CAN become eccentric, just no more so than ~1/32" at very worst.
Will mig welding likely affect the threads much or the concentricity of the ring beyond the above tolerance? If so, can brazing be used to fill gaps (because of the hex nut and circular pocket issue) and would it, with its much lower temperatures, affect the threads and ring much less? Or would even epoxy hold, given over 1.5 X 3/8" gripping surface area?
thanks! -Bernard Arnest