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11/21/2020 6:48 PM  #1


Self tapping leadscrew we’ll sort of

I made a post earlier https://fyi.boardhost.com/viewtopic.php?id=11231 about the leadscrew on my lathe being standard ACME threads on a 20mm shaft. Anyway I needed a new brass nut so I purchased a 3/4-10 lh acme nut and modified the end of my leadscrew by tapering the end and cutting 8 groves in its threads kind of like a tap. I cut the nut in half and then spent 3 hours total working both donuts back and forth on the leadscrew. It was a pain but worked and I know have nuts with the correct thread.


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11/21/2020 7:14 PM  #2


Re: Self tapping leadscrew we’ll sort of

Ain't ingin-nuity grand.  Good for you....again....Day.

BB1


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

11/21/2020 7:35 PM  #3


Re: Self tapping leadscrew we’ll sort of

Bullet Bob wrote:

Ain't ingin-nuity grand.  Good for you....again....Day.

BB1

 Thanks. I love problem solving!!!


If it isn't broken...modify it anyway! http://www.DazeCars.com https://galaxieforum.boardhost.com
     Thread Starter
 

11/21/2020 7:53 PM  #4


Re: Self tapping leadscrew we’ll sort of

Just so I understand correctly, for me.  I’m not a machinist.

You made your existing leadscrew into a tap for your brass nuts?

 

11/21/2020 8:10 PM  #5


Re: Self tapping leadscrew we’ll sort of

Nos681 wrote:

Just so I understand correctly, for me.  I’m not a machinist.

You made your existing leadscrew into a tap for your brass nuts?

That’s exactly what I did it was just the tip that never drives the carriage. I use the word “tap” loosely as I was not able to create new threads in a piece of aluminum but it did the job of enlarging the original threads. The nut was .030” to small and now it’s a perfect fit for the leadscrew.
 


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     Thread Starter
 

11/21/2020 9:58 PM  #6


Re: Self tapping leadscrew we’ll sort of

Nice thread chaser.

One of my valued tools...is a cheap thread chaser for spark plugs that I bought years ago.

I’ve made makeshift chasers with bolts and a grinder at work.
The first time I did it the guys were trying to figure out what i was making.

 

Board footera


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