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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Follow rest
I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter
of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? |
#2
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Follow rest
On 2008-02-03, oldjag wrote:
I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I've seen someone post an article about a tool holder which included a steady rest as part of it. I forget whether it was a commercial device, or someone's homebrew. You might be able to make something which will clamp with the last two setscrews in the holder and use a fairly sort tool under the first two setscrews. In my case, the traveling steady for my Clausing bolts to the saddle extensions to the left of the carriage, and I can offset the BXA sized toolpost with a combination of sliding the T-nut to one side and using the compound to offset it enough. But for the ones which bolt to the underside of the carriage, like the South Bend ones, I'm not sure what you could do. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Yes -- with lots of care to protect the ways with that long a travel of the carriage. My carriage won't even *go* 26". It is a 12x24" machine. :-) Good Luck, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#3
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Follow rest
oldjag wrote:
I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Here's one: http://www.followerrest.com/followersite_001.htm there is also a commercial product similar except all steel and more compact, but I can't find it right now. |
#5
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Follow rest
Rex wrote:
Here's one: http://www.followerrest.com/followersite_001.htm ... Whenever I see something like that, my first thought is "Could I build something like that? Could I build it better?" I think that I could. One of the first things I thought could be changed is the capacity. That looks like it could handle very large stock. But how large do you need a follower for? My lathe is 10 x 24. What is the minimum diameter of a 24" piece that I can turn between centers without a follower? 1.5"? If so, the follower would only have to handle up to 1.5". Much less than the one shown and easier to build. Oh, wait ... I guess that one might use a follower for stock in a chuck where the stick out is too long. I.e., not between centers. Where the diameter might be larger than 1.5. I dunno, but I think that one that would handle 1.5" stock would be useful and easy to build. I'll think about it. Bob |
#6
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Follow rest
On Feb 4, 5:46 pm, (Doug White) wrote:
Keywords: In article , wrote: oldjag wrote: I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Here's one: http://www.followerrest.com/followersite_001.htm Looks interesting, but the page is several years old & several of the photo links are messed up. I sent an email to see if he still exists. Doug White Yeah I saw that one, but didn't like the lack of apparent rigidity, and not having rollerized work followers. |
#7
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Follow rest
Doug White wrote:
Keywords: In article , wrote: oldjag wrote: I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Here's one: http://www.followerrest.com/followersite_001.htm Looks interesting, but the page is several years old & several of the photo links are messed up. I sent an email to see if he still exists. There is a better commercial version of similar design, all steel and more compact. I just couldn't locate it yesterday. I have seen it it in more than one of the big tool vendors catalogs. |
#8
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Follow rest
Keywords:
In article , wrote: Doug White wrote: Keywords: In article , wrote: oldjag wrote: I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Here's one: http://www.followerrest.com/followersite_001.htm Looks interesting, but the page is several years old & several of the photo links are messed up. I sent an email to see if he still exists. There is a better commercial version of similar design, all steel and more compact. I just couldn't locate it yesterday. I have seen it it in more than one of the big tool vendors catalogs. For the curious: I got an email back from the guy. He said he stopped making them, but if he could find the parts, an AXA sized one would be $150. Doug White |
#9
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Follow rest
Keywords:
In article , oldjag wrote: On Feb 4, 5:46 pm, (Doug White) wrote: Keywords: In article , wrote: oldjag wrote: I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Here's one: http://www.followerrest.com/followersite_001.htm Looks interesting, but the page is several years old & several of the photo links are messed up. I sent an email to see if he still exists. Doug White Yeah I saw that one, but didn't like the lack of apparent rigidity, and not having rollerized work followers. Here's a home made one that may not be rigid, but has rollers: http://www.frets. com/FretsPages/Machining/Tooling/MiniFollower/minifollower.html The rigidity could presumably be improved. Doug White |
#10
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Follow rest
"oldjag" wrote in message ... I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Just another possibility---- A 3 ft chunk of 17mm oil hardening drill rod is less that $20. If it would work, that eliminates the turning part of the job and maybe even the grinding part, depending on what you need. |
#11
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Follow rest
On Feb 5, 7:23 pm, "BillM" wrote:
"oldjag" wrote in ... I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Just another possibility---- A 3 ft chunk of 17mm oil hardening drill rod is less that $20. If it would work, that eliminates the turning part of the job and maybe even the grinding part, depending on what you need. This is a swing arm shaft, and the 4140 provides a little more of a safety factor than the drill rod. The shaft will be threaded on each end after cutting it to size. So far I have not been able to locate 4140 shafting or ground stock in metric diameters. If all else fails, I may try to find somewhere to have it centerless ground to size. |
#12
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Follow rest
On Tue, 5 Feb 2008 21:24:47 -0800 (PST), oldjag
wrote: If all else fails, I may try to find somewhere to have it centerless ground to size. http://www.bostoncenterless.com/materials.htm My connection is as a satisfied customer. -- Ned Simmons |
#13
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Follow rest
Many times I have called MSC when I need something that isn't in the
catalog, but is close to something that is. The almost always contact the vnedor and usually are able to quote it right there. A 3 foot 17mm piece of drill rod sounds like a good candidate. Pete Stanaitis ---------------- oldjag wrote: On Feb 5, 7:23 pm, "BillM" wrote: "oldjag" wrote in ... I'm trying to turn down a 3/4" x 26" long 4140 shaft to a diameter of 0.669" +/- 0.0005" (17mm). Does anyone have a design or source for a follow rest that attaches to or near an Aloris CXA tool post? The normal follow rest that came with the lathe would be hopeless due to the offset relative to the tool point. I'm hoping to get within a 2-4 thou and then grind to the final diameter with a Dumore tool post grinder. Does this seem like a possible scenario? Just another possibility---- A 3 ft chunk of 17mm oil hardening drill rod is less that $20. If it would work, that eliminates the turning part of the job and maybe even the grinding part, depending on what you need. This is a swing arm shaft, and the 4140 provides a little more of a safety factor than the drill rod. The shaft will be threaded on each end after cutting it to size. So far I have not been able to locate 4140 shafting or ground stock in metric diameters. If all else fails, I may try to find somewhere to have it centerless ground to size. |
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