Disassembling Motor problem with clip/u-nut
#1
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Thread Starter
Join Date: Apr 2016
Location: Boston, MA
Posts: 26
Disassembling Motor problem with clip/u-nut
I am in the process of rewiring the original motor for my Pfaff 130-6. But, I've run into a problem. on one side of the motor there is a bolt that goes into a clip nut/u-nut and I can't get the threads to catch and there can't remove the bolt to completely disassemble the motor.
[ATTACH=CONFIG]619493[/ATTACH]
Any suggestions?
Thanks,
Tammy
[ATTACH=CONFIG]619493[/ATTACH]
Any suggestions?
Thanks,
Tammy
#2
Super Member
Join Date: Jan 2011
Posts: 1,079
Maybe you can try chasing the threads with a die nut....
Here is a youtube video that shows what I mean.
https://www.youtube.com/watch?v=qPk6HBvnhK0
this link shows pictures of die nuts...they come in different sizes.
https://duckduckgo.com/?q=die+nut&t=...ages&ia=images
Here is a youtube video that shows what I mean.
https://www.youtube.com/watch?v=qPk6HBvnhK0
this link shows pictures of die nuts...they come in different sizes.
https://duckduckgo.com/?q=die+nut&t=...ages&ia=images
#3
Member
Thread Starter
Join Date: Apr 2016
Location: Boston, MA
Posts: 26
I think, it is likely that I can't get the double ended threaded rod out because of thread damage. But, if I can't the rod out, there is not way to chase the threads. I do have a set of die nuts.
So my problem at the moment is that I haven't figured out how to remove the rod. After I get the rod out then I can see if the threads can be repaired or come up with a replacement.
I've tried pulling up and pushing up on the rod as I turn but I can't get the threads to catch. I guess I might be able to cut the u-nut off but the space is so tight I'm not sure I can do that.
Any thoughts on how I could remove the threaded rod would be greatly appreciated.
Tammy
So my problem at the moment is that I haven't figured out how to remove the rod. After I get the rod out then I can see if the threads can be repaired or come up with a replacement.
I've tried pulling up and pushing up on the rod as I turn but I can't get the threads to catch. I guess I might be able to cut the u-nut off but the space is so tight I'm not sure I can do that.
Any thoughts on how I could remove the threaded rod would be greatly appreciated.
Tammy
#4
Member
Join Date: Sep 2018
Location: River City, Orygun
Posts: 86
It's gonna take more force than just "pulling up" on the bolt. If you can get a pin punch through from the other side (nut end) give it a good whack to distort the clip/nut. If not wedge under the square of the bolt to engage the nut. Those nuts (also called tinnerman nuts) are stamped steel and distort when the fastener is tightened. They don't require "good" threads on the bolt for engagement, but the edges of the nut do need to engage a thread- which is why they must be forced into shape.
#7
Junior Member
Join Date: Dec 2018
Location: Havelock NC
Posts: 187
I am in the process of rewiring the original motor for my Pfaff 130-6. But, I've run into a problem. on one side of the motor there is a bolt that goes into a clip nut/u-nut and I can't get the threads to catch and there can't remove the bolt to completely disassemble the motor.
[ATTACH=CONFIG]619493[/ATTACH]
Any suggestions?
Thanks,
Tammy
[ATTACH=CONFIG]619493[/ATTACH]
Any suggestions?
Thanks,
Tammy
#8
Member
Thread Starter
Join Date: Apr 2016
Location: Boston, MA
Posts: 26
Thanks for the information about the Tinnerman nuts (learned something new). I got the motor apart. There was no way to give the bolt a good wack from the nut end, and I broke the Tinnerman nut trying to pry the prongs up. But I was able to get the motor apart, so now I can take care of the wiring and clean up the motor.
There is a fairly wide and deep grove in the existing double threaded rod, so I might have to replace it (maybe with a threaded rod).
Your response was very helpful, Thanks.
Tammy
There is a fairly wide and deep grove in the existing double threaded rod, so I might have to replace it (maybe with a threaded rod).
Your response was very helpful, Thanks.
Tammy
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