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Thread: ARM compound screw
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19th Aug 2019, 11:05 PM #16Gear expert in training
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21st Aug 2019, 04:20 PM #17Intermediate Member
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I got a bit of quality shed time in last night and managed to knock up a copy of the feed screw for threading. Had to sharpen the cold chisel a couple of times. I'll probably try a test run on another shaft before I tackle this one.
Anyone know the thread size on the handle end? I don't think it's metric according to my thread gauges.
I am in Melbourne too, and thanks for the offer. I think I'll wing and see how I go.
For some reason I'm getting signed in on this forum with the details from another tapatalk forum, so I've lost my history and location details....
Martin
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22nd Aug 2019, 09:59 PM #18Member
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22nd Aug 2019, 10:09 PM #19Intermediate Member
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I haven't cut the threads yet, just turned a blank. Hopefully I'll get some time this weekend.
I'll single point it, light cuts to sneak up on final size, using the feed nut to test. I have an acme hss tool so I'll check that in the 'old' screw and hone it to a decent fit.
Martin
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22nd Aug 2019, 10:15 PM #20Intermediate Member
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Oh, and I'm using 1214 free machining steel.
Martin
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23rd Aug 2019, 09:26 AM #21Most Valued Member
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Hi Martin
in your pic, is the thread on the right side of your machined blank the one you are copying?
It looks (from the pic) to be a square thread.
Phil
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23rd Aug 2019, 09:40 AM #22australian metalworking hobbyist
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Hi Martin,
It is definitely 2mm pitch acme thread on an imperial shaft. Turn the threaded section dia to an undersized 3/8 at .371". Pretty much every metric drive screw in a Hercus is acme thread form. You can take this as Gospel as it comes from original Hercus drawings.
Mal
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23rd Aug 2019, 10:38 AM #23Intermediate Member
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Thanks Mal.
I had a suspicion that there was something NQR about the threads on these metric Hercus 9s. I probably read it in one of your threads somewhere.
Can you confirm what the thread is on the other end? Grateful for your assistance.
Martin
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23rd Aug 2019, 01:06 PM #24australian metalworking hobbyist
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23rd Aug 2019, 02:34 PM #25Intermediate Member
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Okay, I might make a new nut in metric. I don't have any whitworth dies.
Martin
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23rd Aug 2019, 05:51 PM #26
Hi M.J,
Single point it on the lathe !Best Regards:
Baron J.
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23rd Aug 2019, 08:19 PM #27Senior Member
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I'll lend you one if you're in Melbourne.
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23rd Aug 2019, 10:09 PM #28Philomath in training
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When repairing old machines, do your best not to mix fastener types - it really creates headaches later on, either because it degrades the machine (I once had a 1/2" UNC thread fitted where it should have been 1/2" BSW - pity about the tpi being different...) or will cause confusion for the next person that has to repair/ replace something.
Taps and dies can usually be borrowed if you don't want to buy them (although that too is part of the rabbit hole experience)
Michael
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24th Aug 2019, 02:06 AM #29
Hi Guys,
I've got to agree with Michael, the Taiwanese bandsaw that I've recently acquired, has a mix of metric, BSF and Whit screws and bolts.Best Regards:
Baron J.
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24th Aug 2019, 09:46 AM #30Intermediate Member
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I get where you're coming from. My view is that firstly the lathe is a tool, and I want it to work. If that means making changes so that it works for me and I can fix it, then I will.
That said, the original screw and nut will be kept with the lathe and if I sell it, the new owner will be able to return it to original condition if they want.
Plus I'm talking about a nut that has a slot head. It won't require a different tool from stock to remove.
I did actually inherit some English dies from my uncle. I'll look through them to see what I've got. How do I identify a whitworth die?
Martin
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