tim, my reference was not to the nut turning sideways...it is that the nut is just wearing out due to so many travels up and down the X axis...the wear is not "into" the threads of the nut, but rather to each side of the thread...in the worn photo, you can see that the thread is now a centered "V", where originally it was square...I am following up with this comment as I thought I did not explain it very well, but I think we are on the same page...joe
On Thursday, August 3, 2017 at 11:31:39 AM UTC-4, Tim wrote: > > If your nut is turning sideways, there is too much friction in the > system. Now I don't know if this applies to the early machines, but the > top hat bushings in the new machines are notorious for this problem. There > was a final update to the split nut that had shoulders that prevented the > split nut from twisting, but without solving the friction issue it lead to > stripping the nut instead of just twisting the nut out of the holder. I > don't have a picture of this, but there is a conversation in the group that > had a photo. > > Knowing what I know now, I would make a tap from a piece of existing > acme. I do own a 5/8-4 acme tap that I imported from England via a eBay > seller. There is nobody in the states that would even entertain the idea > of one. If I recall, they were old stock and never made again by the > supplier. If anyone has a source, it would be good to know about. > > > On Aug 3, 2017, at 7:00 AM, 'joe biunno' via Legacy Ornamental Mills < > legacy-orna...@googlegroups.com <javascript:>> wrote: >> >> i'll offer an opinion here, as this could have been a problem for me on >> my recently acquired 1500...the problem is, due to the action/movement of >> the lead screw, the threads in the split nut wear sideways, especially when >> using a drive motor...think of each cross section of thread as a square(see >> photo)...I measured the cross section of the thread(in a new nut) to be >> .140" wide...in the photo of the worn nut, that same dimension is down to >> .065...so you could say the thread went from 1/8" full(new) to 1/16"...and >> sanding the nut down is not going to improve the function of the nut, in my >> opinion...maybe early on you can sand the nut to get a bit more life out of >> it, but that's it...the key to solving this problem is finding the 5/8-4 >> acme thread tap...once you have the tap, to make a new split nut is >> somewhat simple...and anyone who has that "hinged" split nut, I would swap >> that out and set up a sliding split nut...much more problematic to make >> that hinged split nut...so, if any member knows where to get that tap, here >> or overseas, please let the group know...I certainly would like to purchase >> one...barring that, I would also attempt to make a tap from some acme, >> threaded rod, if I had to...and the casting idea is also an excellent >> idea...joe b. >> >> >>>>> -- You received this message because you are subscribed to the Google Groups "Legacy Ornamental Mills" group. To unsubscribe from this group and stop receiving emails from it, send an email to legacy-ornamental-mills+unsubscr...@googlegroups.com. To post to this group, send email to legacy-ornamental-mills@googlegroups.com. Visit this group at https://groups.google.com/group/legacy-ornamental-mills. For more options, visit https://groups.google.com/d/optout.
