Cant get threaded rod straight.

[Rance]

Fodder,

Using a bigger stepper is NOT the solution to a binding problem. Take the time/effort to fix the alignment problem. You'll be glad you did.

[There was a post here that went on about using a long bit of HPDE (50mm) and thread it. Search for "cheap lead screw".]
http://www.cnczone.com/forums/showpo...3&postcount=88

More on whipping... http://www.cnczone.com/forums/showpo...62&postcount=9

Excerpt from another thread [A while back I spoke to a garage door/ opener installer about acme lead screws used in door openers. They either come in 3 foot 6 inch or the full 7 foot sections. They throw the old openers in the trash. Food for thought.] (From http://www.cnczone.com/forums/showpo...89&postcount=4)

[NC Cams]

Good idea: use NEW acme thread from garage door opener to provide linear motion.

Questionable idea: use a WORN (probably unevenly) acme screw from an old garage door opener that was probably replaced because it was never or hardly ever maintained in the first place.

Understandably, there are cost issues that have to be considered in the DIY hobby BUT don't add to the challenge by using worn/tired stuff just because it's free. Sometimes, its not worth the price/hassle...

[Fodder1]

Hi all,

RANCE, thanks for that. The garage door opener screw is a great idea, if I could get one..... and like NC CAMS said you can get into more trouble by using crappy componets. At the same time for what I am doing it might work if I can find a good one.

As for the motor size, I was never going to replace them, just the power supply. (12v to 36v) But what you said goes the same for both.

Since the last post I have pulled off the Z axsis carrage and removed the lead screw. I laided it on a bench and its out by stuff all.(3-5mm) So there must be another problem. I started to look around and actually when out and brought a decent square. It seem the Z axsis carrage is out of square by about 5 mm. I think I found the problem it must have moved when I glued & screwed

I have started to cut a new one, this time I am going to use the router to make sure the bearing mounts stay straight.

RANCE,
I did see that HPDE bock thing you talked about, but that stuff is very pricy over here in AUS. As I said above I am in the prosess of rebuilding the z Axsis. While doing that I dropped into the local bolt shop. It seem the "Joiners" for the threaded rod are about 25 mm long. cant tell yet about how much backlash they will have.
But since I have to rebuild the Z axsis anyway.........

THanks for your time guys.

CH

[Rance]

If HPDE is expensive, try getting a cutting board for the kitchen. Most of them are the same thing. However, these are sometimes too thin. No, don't use crappy components, but if you get 5 rods from door openers for FREE (my favorite word), then one (or two) might be usable. I wish you well with your build.

[Fodder1]

Thnaks RANCE,

Yea i agree. I am shore that at some stage i will come across a person that installs them or something. And you never know, one of those mightbe in good condition for what we want to use it for.

I will reprot back on how the "joiner"nut for the threaded rod goes.

CH