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 Look at this on eBay
Here is the link to the brass half nuts that I installed in my lathe yesterday. Steve Haskell Troy, MI
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Thanks Steve,
I'll hang onto this seller for future half nut swap. Jody
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-------- Original message -------- From: "Steven H via Groups.Io" <stevesmachining@...> Date: 2/4/19 8:04 PM (GMT-06:00) To: [email protected] Subject: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut Look at this on eBay
Here is the link to the brass half nuts that I installed in my lathe yesterday. Steve Haskell Troy, MI
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I put a brass set in two years ago and posted the pics.? Some here thought it was OK and others stated that the Zmac was a good set and the standard to maintain.? As I remember, there is an adjustment that was to be made if you use the brass set.? I would have to go the shop (miles away) to find the paper.? Did you get this paper with the half nuts??
On Mon, Feb 4, 2019 at 8:39 PM Jody < jp4lsu@...> wrote: Thanks Steve,
I'll hang onto this seller for future half nut swap. Jody -------- Original message -------- From: "Steven H via Groups.Io" <stevesmachining= [email protected]> Date: 2/4/19 8:04 PM (GMT-06:00) To: [email protected] Subject: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut Look at this on eBay
Here is the link to the brass half nuts that I installed in my lathe yesterday. Steve Haskell Troy, MI
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Yes, there was a copy of the Atlas half nut installation instructions included with the new nuts. No adjustment needed other than moving the tailstock to the far RH end of the bed, lock down the taikstock, then move the saddle down to the far RH end of the bed as far as the tailstock will allow. Then use a 7/16” wrench to loosen the hex head screw on the underside of the leadscrew bearing bracket. Then engage the half nut lever to clamp the half nuts onto the leadscrew. This sets the leadscrew bearing bracket front/rear position. Finally tighten the hex head screw on the bottom of the leadscrew bearing bracket.
This was an install on a Model 3996 12” Atlas (aka “Craftsman Commercial”). The “Adjusting Lead Screw Alignment” instructions are shown in the Model 3996 Operating Instructions and Parts List in the Group files section.
On an Atlas 10F lathe, the 10F-16 leadscrew bearing bracket is solid with no forward/rear adjustment. I guess if any adjustment was necessary one could shim behind the bracket or remove a slight amount of material from the mounting face of the bracket.
Steve Haskell
Troy, MI
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The only adjustment I know of for the brass split nut is the same as for new ZAMAK from Clausing; Gently file a chamfer on the leading edge of each of the threads. Atlas published a tech note on this and included it with each new set shipped. I have attached a somewhat fuzzy jpeg copy.
Raymond
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BTW: I am not certain brass is the best choice of material. I think the E-Bay sellers are machining them from brass because it is a common material, easy to machine, and is much softer than the leadscrew and will be kind to it. I would prefer C932 Bearing Bronze (aka SAE 660 bronze). I asked one of the sellers who was making them in his shop if he could do it in bronze but he declined. Bearing bronze is about 30-40% more costly than C360 brass. Alas, I do not have the machinery nor have I yet acquired the skill set to make them myself.? Meanwhile, the ZAMAK split nuts for a 3/4" leadscrew are still available from Clausing.
Raymond
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There is also a PDF of the same document in the Group’s Files section in ? ·? Files ·? 23 Maintenance, Repairs and Tech Bulletins ? Robert Downs ?
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From: [email protected] [mailto:[email protected]] On Behalf Of mondosmetals
Sent: Tuesday, February 5, 2019 07:54
To: [email protected]
Subject: Re: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut? The only adjustment I know of for the brass split nut is the same as for new ZAMAK from Clausing; Gently file a chamfer on the leading edge of each of the threads. Atlas published a tech note on this and included it with each new set shipped. I have attached a somewhat fuzzy jpeg copy. Raymond
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No filing of the corners was necessary, the brass half nuts had generous chamfers already machined by the maker.
Steve Haskell
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I am at a loss for why one would pay double for an item from E-bay when an OEM part is available new direct from Clausing.? Not interested in zamak bashing.? Evidence does not support it.?
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Steve I agree, I did not have to file any edges.? I am including two pics about the spacer washer that I mentioned earlier.
On Tue, Feb 5, 2019 at 3:43 PM Steven H via Groups.Io <stevesmachining= [email protected]> wrote: No filing of the corners was necessary, the brass half nuts had generous chamfers already machined by the maker.
Steve Haskell
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Other than the obvious, what is the purpose of the spacer?? Or when would you need to use it? ? Robert Downs ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Larry Hoelscher
Sent: Tuesday, February 5, 2019 19:16
To: [email protected]
Subject: Re: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut? ...? I am including two pics about the spacer washer that I mentioned earlier. ?
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I used a spacer to make the lines on the thread dial assembly line up correctly after installing new half nuts from Clausing.
On Tue, Feb 5, 2019 at 9:58 PM Robert Downs via Groups.Io <wa5cab= [email protected]> wrote: Other than the obvious, what is the purpose of the spacer?? Or when would you need to use it? ? Robert Downs ? ? ...? I am including two pics about the spacer washer that I mentioned earlier. ?
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Hi Bill, ? Not taking sides on this one , but in my personal experience the Zamak parts do seem to vary in terms of longevity .
Some years ago I imported the slotted shaft which operates the half nuts from the OEM . . . it arrived in a sealed packet , with what looked like a bit of talc powder to stop it oxidising ?
Last year when I wanted to use it , it had disintegrated – still in its sealed packet . . .
Keep well, ? Carvel ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Bill Pendergrass
Sent: 06 February 2019 02:47 AM
To: [email protected]
Subject: Re: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut ? I am at a loss for why one would pay double for an item from E-bay when an OEM part is available new direct from Clausing.? Not interested in zamak bashing.? Evidence does not support it.?
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??? ??? I have heard/read about that happenin with Zamak
??? animal
On 2/5/2019 11:42 PM, cwlathes wrote:
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Hi Bill,
?
Not taking sides on this one
, but in my personal experience the Zamak parts do seem to
vary in terms of longevity .
Some years ago I imported the slotted shaft which operates
the half nuts from the OEM . . . it arrived in a sealed
packet , with what looked like a bit of talc powder to stop
it oxidising ?
Last year when I wanted to use it , it had disintegrated –
still in its sealed packet . . .
Keep well,
?
Carvel
?
From: [email protected]
[mailto:[email protected]] On Behalf Of Bill
Pendergrass
Sent: 06 February 2019 02:47 AM
To: [email protected]
Subject: Re: [atlas-craftsman IO] Atlas / Craftsman
10F-12 10" & 12" Lathe Half Nuts / Split Nut
?
I am at a loss for why one would pay double
for an item from E-bay when an OEM part is available new
direct from Clausing.? Not interested in zamak bashing.?
Evidence does not support it.?
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Spacer is to line up the marks on the threading dial, most often marks get out of alignment when parts are mixed from different machines..
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This is called “zinc pest” and is the result of the casting alloy (primarily zinc) having lead as an impurity. ’Tain’t s’posed to be any lead in there, but has been known to happen. In other words, this is an anomaly not something endemic to Zamak or other zinc-based alloys. The Zamak alloy used in our lathe parts is quite a strong & durable alloy. Check it out. BUT some few parts have fallen to zinc pest.? There is no way to induce this problem in existing parts, nor to remedy it (except replacing the parts).
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On Feb 6, 2019, at 12:39 PM, seb fontana via Groups.Io < speedoo51@...> wrote:
Spacer is to line up the marks on the threading dial, most often marks get out of alignment when parts are mixed from different machines..
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Speedoo51: I had considered that the actual threads in the brass were not accurate to the size of the half nuts.? Yes, when I was reworking my lathe I replaced my lead screw with less worn acme threads, so all these parts can vary the accuracy? of the threads.? Only the? half nuts and the position of the thread dial can tell you when to start your threads.? All good info.
On Wed, Feb 6, 2019 at 1:51 PM Jim Irwin < jimirwin@...> wrote: This is called “zinc pest” and is the result of the casting alloy (primarily zinc) having lead as an impurity. ’Tain’t s’posed to be any lead in there, but has been known to happen. In other words, this is an anomaly not something endemic to Zamak or other zinc-based alloys. The Zamak alloy used in our lathe parts is quite a strong & durable alloy. Check it out. BUT some few parts have fallen to zinc pest.? There is no way to induce this problem in existing parts, nor to remedy it (except replacing the parts).
Jim Irwin On Feb 6, 2019, at 12:39 PM, seb fontana via Groups.Io < speedoo51@...> wrote:
Spacer is to line up the marks on the threading dial, most often marks get out of alignment when parts are mixed from different machines..
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OK.? That does save time and hassle to remove, rotate and press back on the gear. ? Robert Downs ?
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From: [email protected] [mailto:[email protected]] On Behalf Of seb fontana via Groups.Io
Sent: Wednesday, February 6, 2019 12:39
To: [email protected]
Subject: Re: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut? Spacer is to line up the marks on the threading dial, most often marks get out of alignment when parts are mixed from different machines..
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Did you request a replacement part?
Sent from my Boost Mobile Phone.
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-------- Original message -------- From: Jim Irwin <jimirwin@...> Date: 2/6/19 2:51 PM (GMT-05:00) Subject: Re: [atlas-craftsman IO] Atlas / Craftsman 10F-12 10" & 12" Lathe Half Nuts / Split Nut
This is called “zinc pest” and is the result of the casting alloy (primarily zinc) having lead as an impurity. ’Tain’t s’posed to be any lead in there, but has been known to happen. In other words, this is an anomaly not something endemic to Zamak or other zinc-based alloys. The Zamak alloy used in our lathe parts is quite a strong & durable alloy. Check it out. BUT some few parts have fallen to zinc pest.? There is no way to induce this problem in existing parts, nor to remedy it (except replacing the parts).
Jim Irwin On Feb 6, 2019, at 12:39 PM, seb fontana via Groups.Io < speedoo51@...> wrote:
Spacer is to line up the marks on the threading dial, most often marks get out of alignment when parts are mixed from different machines..
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Rexarino Feb 5 #102601
I used a spacer to make the lines on the thread dial assembly line up correctly after installing new half nuts from Clausing.
Regards,
Rex
Just for future reference, how do you know or what is the indication, that the dial is not in sink with the half nuts and would require a spacer?
Thanks, Ken H in AZ
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Steven H
Bill Pendergrass
Ken H