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Thread: Metric threaded rod - pitches
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13th August 2015, 03:33 PM #1GOLD MEMBER
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Metric threaded rod - pitches
For a table saw fence project I'm embarking on, I need a 2 metre length of 16 - 20mm threaded rod.
No problems in getting this but at that size, the pitch that most all seems to be metric coarse i.e. 2.0 or 2.5
Is threaded rod of that diameter made in a metric fine pitch? A 1mm pitch would be ideal butt 2mm would be OK.Geoff
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13th August 2015, 03:49 PM #2SENIOR MEMBER
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It has to be one continuous 2 metre lenght? That will cut down your options. Not sure you will find it longer than 1 metre.
All fasteners in Tullamarine list an M20 x 1.5, but 1 metre long only.
http://www.allfasteners.com.au/threa...unplated-black
Regards Phil.
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13th August 2015, 03:54 PM #3GOLD MEMBER
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Hi, in 16 mm you have a choice of 1.5 or 2 mm pitch and 20 mm has 1.5 and 2.5 mm pitch, according to my little black book.
Fasteners Australia have it in a 3 metre length price M 16 $35.88 and M 20 $57.75 Zinc Finished
Kryn
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13th August 2015, 04:10 PM #4GOLD MEMBER
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For the application, it needs to be either 1mm or 2mm pitch, not 1/2mm.
According to one table I found, 18mm and 20mm metric fine comes in 1mm and 2mm pitches.
For accuracy, it really needs to be a continuous length.Geoff
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13th August 2015, 05:46 PM #5GOLD MEMBER
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13th August 2015, 07:21 PM #6Senior Member
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T.E.A Transmissions in Queensland have threaded rod and nuts designed for accurate linear positioning.
Their stock 16 and 20 mm sizes are 4 mm pitch with a 0.1 mm per 300 mm accumulating error in lengths to 2 m.
Other sizes available by request.
https://www.tea.net.au/Portals/0/uploads/PAGE%2034.pdf
John.
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13th August 2015, 07:34 PM #7GOLD MEMBER
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13th August 2015, 11:46 PM #8GOLD MEMBER
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Anyone out there got a 2.4 m BC lathe, and can cut a 1mm pitch thread in 20mm bar, to help this poor man out of his misery
Kryn
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14th August 2015, 12:26 AM #9
Bolt do M16x2 in 3m lengths. Not exactly what you want though. https://www.bolt.com.au/mild-steel-r...1818_1819.html
1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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14th August 2015, 12:32 AM #10GOLD MEMBER
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2mm would be OK.On the table saw fence, this would allow a minimum increment of 2mm which is probably enough. The original design allows for 1/16"
https://www.youtube.com/channel/UC0T...tparOZw/videosGeoff
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14th August 2015, 02:04 AM #11GOLD MEMBER
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You could mount an electric motor on the end of the shaft, hook it up to a computer and have a CNC fence guide Or put a handle on the end and have infinite adjustment for the fence. Just a couple of different thoughts.
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14th August 2015, 08:02 AM #12Philomath in training
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As an alternative, how about using a solid rod (clamp the fence to the rod) and on the end have a threaded section 200mm long say that can provide the fine adjustment. Even with a 2mm pitch, adjusting your fence from say 1m to 1.5m is going to get awfully old awfully quick. (BTDT)
Michael
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14th August 2015, 09:16 AM #13SENIOR MEMBER
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14th August 2015, 09:38 AM #14GOLD MEMBER
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The threaded rod isn't turned to locate the fence, it's fixed in position and is used to lock the fence to within 1/16" of where you want it (imperial measurement used in the linked design)
Actually the rod can be turned half a rotation if you need 1/32" accuracy. This is why a 2mm pitch is OK as half a turn adjustment gives you a 1mm accuracy.
If I use a thread pitch of 1.5 (or 2.5) then I'm (theoretically) within 1.5mm or 2.5mm whereas I'd prefer this to be a whole number. Hope this makes sense to anyone who hasn't viewed the video.Geoff
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14th August 2015, 10:55 AM #15SENIOR MEMBER
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I just watched the video and was wondering if you need the whole length threaded or just the area where the third nuts (half nuts) clamp.
It would be easier to screwcut a shorter section in the middle or wherever out of solid bar than purchase that length of running thread.
Probably cheaper as well. I know I can screwcut at least 700mm comfortably out of any size bar or pipe.
Phil
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