Originally Posted by mjarus I assume that you are talking about a delrin slide for the rails here. If so, how is that mounted in the aluminum blocks? The aluminum blocks look solid from the underside. Is it hogged out on top? If so, can you post a pic when you get it off? I am curious to see the current set up.
Also, why are you going to use your delrin nut? I thought you had a new brass a/b nut you were working on.
BTW, I purchased some of your delrin nuts and so far with preliminary messing around with them they seem pretty darn good! I was going to use 2 per screw to combat backlash, but I don't think that will be necessary.
Oh yeah, also is the current delrin block on the screw threaded the whole way through? How long is it? Do you use a tap to cut the threads or do you use a single point tool on the lathe?
mjarus. |
MJARUS,
The bronze nut is a completely different project!
I used a tap to make the Acme threads!
This "Mini-Router" project has been on going for many months, everything was tight and smooth sliding except the X-Axis, so I ordered some closed linear ball bushings to try to tighten it up! The bushings did not come with any information, so I had to do some research to figure out what bore diameter was required. Then I made a large solid block and bored two close tollerance holes straight through it, and the bushings went in really precice!
I had to do a little calculation to get the specific number for the bore, as the bearing documentation was based on a .50000" diameter rail; consequently, my rails are .49925, so I shrunk the bore accordingly!
The exsisting slide was made from two pieces of aluminum, with a delrin nut, and teflon bushings. They were sliding nicely, but the teflon was too soft and the bore elongated! So The Ball bushing assembly is much better now!
Next, I have to make an internal square groove cutting tool to put in the boring head, so that I can cut a groove for an expanding spring ring. That will keep the ball bushings from sliding out! Then I will make a little plastic spacer that will go between the two ball bushings.
In order to make the groove tool, I have to order a 1/4" x 7" grinding wheel for my surface grinder. The wheels I have are too coarce and too wide!
While I'm waiting for the grinding wheels, I will drill & tap the end holes, and hog out the middle of the aluminum block to hold the delrin nut!
Eric