Re: Make a "Split Nut"

[MWF]

Thank you, Tim.

Mac

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-----Original Message-----
From: Tim Ziegler
Sent: Feb 2, 2019 8:05 AM
To: Legacy Ornamental Mills
Subject: Re: Make a "Split Nut"

I have a buddy up here in Minnesota that has a CNC and I shot him an email to see if this something he can create. Hopefully I hear something back from him this morning. 

kind regards,

Tim of ZWW&S

On Thursday, August 3, 2017 at 11:23:26 AM UTC-5, Va Oak wrote:

Hello all,
I am not sure how well a split nut made from HDPE will hold up - but here is my 2-cents' worth:
HDPE (Look on bottom of plastic jugs, bottles, etc for the Recycle symbol w/the #2) is the only plastic that I know of that we can "re-purpose" at home.
Do an Internet/BING search for this - you'll be amazed.

I find that the plastic Folgers and Maxwell House coffee canisters are labeled #2 - as are most milk jugs.  The two coffee brands yield red and blue plastic respectively.
My thought is that you embed a matching Acme rod into the mold you melt the #2 plastic in. Once cooled, you should be able to "unscrew" the rod from the plastic billet.  You then cut/machine the billet to the exterior measurements you need and then split it down the center line.  "Machining" can be done with your router, bandsaw, etc.

Does anyone have an idea of how well the #2 plastic (HDPE) will hold up?  Even if it wears down after 6 months of use - you will be able to reuse that worn out piece, with some added #2 plastic, and melt/mold a new piece.  If your mold & billet is long enough, you can produce a year's-worth in one mold.

If anyone tries this - or something similar, please share pictures and results.

Mac

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-----Original Message-----
From: 'joe biunno' via Legacy Ornamental Mills
Sent: Aug 3, 2017 10:00 AM
To: Legacy Ornamental Mills
Subject: Re: Wood Chuck Tour by Mike Pung

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.

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