Originally Posted by widgitmaster If I make the nut out of Titanium, and use Inconel screws, then you will be able to put the enormas force on the 1/2-10 Acme thread you are refferring to! But because this desaign is for the DIY home built router which according to my polls, is being used for light cuts in aluminum, plastics, foam, and wood, I do not think the bronze will wear as excessivily as you described!
Also, because 50% of the nut is solid, the most it could move is the total sum of the origonal backlash! Usually .003-.007" This entire problem could be resolved by including a threaded ring which would screw into the body of the nut, giving 360 deg. of contact, But I still do not see the necessity!
Eric |
You miss my point; it is not wear that I predict it is plastic deformation and it is not the thread that is going to deform it is the material directly under the head of the 10-32 SHCS. The area in contact under the head of this screw is a very tiny fraction of the area of contact in the acme screw. Also it is not the average cutting load that is important it is the maximum load that occurs when the stepper steps; this will be much higher than the average load.
You are quite correct that a threaded ring would solve the problem; actually it does not need to be a ring just thread the adjustable part of the acme nut into the body of the other part and have a locking screw.