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17th March 2019, 06:50 PM #16
OK, so it looks like 1x10 to me. The scale on the top edge of the ruler is 1/20ths, so if you put that over your thread, every second line should line up with each thread pitch exactly for 10 tpi.
I really don’t think it’s a tapered thread, but you can check with your calipers, take a reading at each end of the thread and see if it is the same or not.
Were you saying you tried a 1x10 nut, and it wouldn’t screw on ?Brad.
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17th March 2019 06:50 PM # ADSGoogle Adsense Advertisement
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17th March 2019, 07:00 PM #17GOLD MEMBER
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Mine is a 1 inch x 10 thread. However I have bought 1 inch by 10 nuts for it before to make special chucks and they do not quite fit. If you want to borrow a face plate to settle the matter you are welcome to lend it. I'm about 1/2 hour south of Hobart.
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17th March 2019, 08:46 PM #18
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17th March 2019, 09:17 PM #19Senior Member
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Agree with Jim. I have the same lathe. Standard 1"x 10 tpi. It is not tapered.
You should have a left hand thread on the other end of the spindle to take a face plate for turning stuff that is too big for the bed gap.
John.
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17th March 2019, 09:27 PM #20China
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I have owned three of that model lathe over the years, all 1" 10 tpi none of them had a tapered thread, the guy at the bolt shop needs to get a new job
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17th March 2019, 09:47 PM #21Novice
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No, 1” 10 tpi nut would not thread on. I checked with the rule and yes every second 20th lays on the peak of a thread.
so it’s a 1” 10 tpi. It must be..... I’ll get another nut from work and check again. Headstock thread doesn’t look damaged...
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17th March 2019, 09:50 PM #22Novice
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Thanks! If things get much more frustrating I might take you up on it. Kingston?
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17th March 2019, 10:42 PM #23GOLD MEMBER
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18th March 2019, 07:01 AM #24
Ahhh, if it’s a BSF thread, the thread angle will be 55 degrees. Most modern threads use 60 degrees. So if that’s the case, you will specifically need to get a 1” BSF nut to screw on there.
I don’t have my thread charts handy , but will get them and check this afternoon.Brad.
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18th March 2019, 08:34 AM #25GOLD MEMBER
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[QUOTE=88rob88;2131095]Thanks! If things get much more frustrating I might take you up on it. Kingston?[/QUOT
Kaoota. I do venture up to town most weeks and would be happy to bring a face plate and chuck to see they fit. Judging by all the replies it is a pretty certain thing.
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18th March 2019, 12:17 PM #26GOLD MEMBER
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88rob88,
I think it is settled that you have a 1 X 10 spindle thread. I expect you are going to buy a chuck. You might go to where you will be buying the chuck and get a 1 X 10 adapter to fit the proposed chuck. There are several classes of fit for nuts and bolts, spindle threads are made to tighter tolerances, as are the parts that screw on to them.
Before trying the adapter on the spindle, lightly oil and scrub the threads, the unthreaded part behind the threads, and the flat at the back with a wire brush. Wipe off and lightly oil and try the adapter. If it catches or is hard to thread, look for any raised divots on the thread and file off. You could also use 120 grit paper wrapped around a table knife.
The threads only hold the chuck or faceplate on the spindle. The unthreaded part behind the threads and the flat behind that are what make the chuck or faceplate run true, and return to the same place when screwed on. These areas are called the register. Check those for any bumps and smooth. I like to run the lathe at the slowest speed and do the unthreaded part by lightly holding a strip of 120 grit on it under tension until it is shiny. The flat I do by running and holding a flat stick wrapped with 120 grit against it.
Any dirt or bump on the back flat will make the faceplate or chuck wobble.So much timber, so little time.
Paul
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18th March 2019, 06:13 PM #27Novice
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Better pic
More light
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18th March 2019, 06:17 PM #28Novice
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18th March 2019, 09:55 PM #29
So can we assume that is a 1" BSF nut?
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18th March 2019, 10:17 PM #30
Going by the damage to the start of the thread, I’m not surprised that you haven’t been successful in getting a nut to fit.
The bit I’ve highlighted in yellow inside the red outline needs to be gently filed back and you’ll also need to file the edge of the nicks out from the other bit I’ve circled as well.
47E2F17B-E66B-489D-9181-4B45833548C1.jpgCheers
DJ
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