Looks like a 1/2-8 8 start.
Count the threads at the end of the screw, where they end. It looks like there are 8.
I'm working on restoring an old, hand-built CNC machine at my local hackerspace, and specifically have started focusing on building a new electronic control system for it. Unfortunately the machine was built custom by someone many years ago (maybe ~10) and comes with no documentation whatsoever, so I'm having to reverse engineer a few things.
From the measurements and observations I've made so far, it seems to me that all axes are using 1/2" x 10 ACME leadscrews - does anyone think I might be mistaken about that?
The last critical parameter I've been trying to figure out is the number of starts of these leadscrews. When I look down the end of the screw (attached) it looks like each thread is separate, which would mean this is a 10 start leadscrew. However, it doesn't seem like those are very common. Does anyone have some tips (or can see from the photos) to figure out how many starts my leadscrews have?
Similar Threads:
Looks like a 1/2-8 8 start.
Count the threads at the end of the screw, where they end. It looks like there are 8.
Last edited by ger21; 07-06-2017 at 09:06 PM.
Gerry
UCCNC 2017 Screenset
[URL]http://www.thecncwoodworker.com/2017.html[/URL]
Mach3 2010 Screenset
[URL]http://www.thecncwoodworker.com/2010.html[/URL]
JointCAM - CNC Dovetails & Box Joints
[URL]http://www.g-forcecnc.com/jointcam.html[/URL]
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Gerry's right... I have those same type screws on my DIY machine... 1" lead...
A-ha! I think you're right! My brain got stuck on the idea of 10 threads per inch for whatever reason, so whenever I looked at the end I just kept seeing 10 threads, haha. Now that you say 8 I totally see it. And I feel like I've seen / heard of 1/2" x 8 ACME leadscrews before.
Thanks!