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Thread: Where's the pivot point?
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22nd Sep 2021, 12:25 PM #1Diamond Member
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Where's the pivot point?
Hi,
I want to make one of these sooner or later:
https://www.ebay.com.au/itm/14420524...r=443500729869
I'm think the pivot point is at the top of the tool (near the handle) but not sure. The more I look at it, the more I'm not sure it'll work. What does everyone think?
Ben.
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22nd Sep 2021, 12:37 PM #2Most Valued Member
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The pivot point seems to be at the lower horizontal bar where you see the pins.
Actually, the pivot it at the top of the tool where those pins are.
The threaded screw pulls the bottom horizontal bar upwards and forces the bottom pincers together.
Simon
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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22nd Sep 2021, 03:17 PM #3Most Valued Member
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Where's the pivot point?
I agree Simon - pivot at the top pins.
For $20 delivered I’m assuming you either already have all the materials and plenty of time, or are just doing it because you want a project.
Steve
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22nd Sep 2021, 07:43 PM #4Diamond Member
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22nd Sep 2021, 08:12 PM #5Most Valued Member
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Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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22nd Sep 2021, 08:20 PM #6Diamond Member
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Totally agree, and the pins in the lower bar from what I can tell are only there as stoppers to stop the arms spreading out to far. So those pins touch, but don't go through the arms at all. I wish I had one of those 30 odd years ago when I used to ride motorbikes, would've saved a bit of grief at times.
All The Best steran50 Stewart
The shortest way to do many things is to do only one thing at once.
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22nd Sep 2021, 08:32 PM #7
The pictures of the tool shows the lower bar is movable and can even over centre the crest in the legs so depends on where the bar is on if screwing in or out closes the legs.
Pivots at the top.
pic.jpg
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22nd Sep 2021, 10:24 PM #8
Hi Guys,
The tool relies on the threaded rod to keep the bars parallel to each other. Turning the screw clock wise pushes the bar away pulling the ends of the chain together. Often a very similar tool can be seen pulling the ends of traction engine chain links together ! And those can be very heavy !Best Regards:
Baron J.
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22nd Sep 2021, 10:58 PM #9Diamond Member
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Here links to two videos on YouTube showing how the device works https://www.youtube.com/watch?v=AQkdS9o-y_o and this one shows an actual chain How to connect Tsubaki Roller Chain that is not on a sprocket - YouTube . I looked at the videos and the internal thread is only in the top beam which means the bottom beam is only a follower so to speak.
All The Best steran50 Stewart
The shortest way to do many things is to do only one thing at once.
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22nd Sep 2021, 11:26 PM #10Most Valued Member
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Isn't it set up incorrectly in the large picture and correctly in the lower three?
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23rd Sep 2021, 08:03 AM #11Most Valued Member
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Good question.
I guess it ultimately depends on whether the threaded bolt is designed to work in compression or tension.
The top photo the threaded rod works in tension, turning anticlockwise. The bottom photos shows it set up to work in compression by turning clockwise.
Simon
Sent from my SM-G970F using TapatalkGirl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.
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23rd Sep 2021, 03:48 PM #12Diamond Member
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Thanks for the replies.
It would be cheaper and easier (and will what I probably end up doing) just buying one from ebay. The tool looks simple and easy to use. I thought it might be a good little project to make at work if I ever get back there. After watching the youtube video I feel stupid for not understanding how it worked.
Here's some video's of what it will be used on:
https://www.youtube.com/watch?v=xlg4M7o-UUM
and
https://www.youtube.com/watch?v=iD_cHDjGNJc
At least once a year we take off chains etc. and it's the same fun time trying to re-fit super tight chains with pliers or screwdrivers and saying we have to come up with a better way.
Regards
Ben.
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