Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Machining

SFT Search:   
Reply
 
Thread Tools Display Modes
  #1  
Old 05-14-2019, 05:03 PM
DENedbalek DENedbalek is offline
Newbie
 
Join Date: Dec 2009
Location: Houston, TX
Posts: 8
Default Threading challenge

Folks, I am new to the forum, well not new, but seldom if ever have posted anything. But now I'm stuck and need your advice. I have a bench grinder that came to me in a deal, but it had shaft extensions and buffing wheels on it. The original washers and nuts that you would use with a stone wheel or wire wheel are long gone.

Not a big deal I thought, just buy or make a couple of nuts. Right handed threads on the right and left handed threads on the left. I got my trusty thread gages out and lo and behold, these are 1/2 inch 12 TPI threads on the motor shaft. Again, may be easier to just buy the nuts. They are not not be found. So, I thought ok, I have a lathe why not just make the nuts. 1st problem I ran into is I don't have any 1/2" 12 TPI taps, right or left handed. So, I thought I'd single point the threads on the lathe, but I don't have any boring bars that will fit in a 27/64 inch hole (the minor dimension of the threads in the nut).

By now, this simple operation is driving me nuts. And I need the grinder if I'm to grind my own HSS bit to single point thread these nuts.

Any other ideas?

Dwayne
Reply With Quote
  #2  
Old 05-14-2019, 06:06 PM
Scotts's Avatar
Scotts Scotts is offline
Stuff, Just stuff
 
Join Date: Dec 2004
Location: Wichita Kansas
Posts: 5,086
Default

Could it be a 9/16-12 or it might be metric.

Just a thought.

Scott
Reply With Quote
  #3  
Old 05-14-2019, 06:47 PM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 7,936
Default

If I was in your shoes I would buy two 7/16 "heavy" nuts and find a friend with a grinder and make your boring and threading bits, I have made both out of hss square bits. If need be cover your ways and chuck up a grinding wheel in your lathe.
__________________
Drawing by Smartdraw
Reply With Quote
  #4  
Old 05-14-2019, 06:53 PM
milomilo's Avatar
milomilo milomilo is offline
Auction Addict
 
Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 14,744
Default

What is the brand and model of the grinder?
__________________
Chris

We are losing sight of civility in government and politics. Debate and dialogue is taking a back seat to the politics of destruction and anger and control. Dogma has replaced thoughtful discussion between people of differing views.
Reply With Quote
  #5  
Old 05-14-2019, 07:04 PM
DENedbalek DENedbalek is offline
Newbie
 
Join Date: Dec 2009
Location: Houston, TX
Posts: 8
Default

Black & Decker Cat. No. 9403 Type 1.
Reply With Quote
  #6  
Old 05-14-2019, 07:05 PM
DENedbalek DENedbalek is offline
Newbie
 
Join Date: Dec 2009
Location: Houston, TX
Posts: 8
Default

Quote:
Originally Posted by digr View Post
If I was in your shoes I would buy two 7/16 "heavy" nuts and find a friend with a grinder and make your boring and threading bits, I have made both out of hss square bits. If need be cover your ways and chuck up a grinding wheel in your lathe.
I understand the making of thread cutting bits out of HSS, but I don't understand the 7/16 Heavy Nuts application.
Reply With Quote
  #7  
Old 05-14-2019, 07:25 PM
digr's Avatar
digr digr is offline
The Real Deal
 
Join Date: Apr 2005
Location: Duluth MN
Posts: 7,936
Default

Quote:
Originally Posted by DENedbalek View Post
I understand the making of thread cutting bits out of HSS, but I don't understand the 7/16 Heavy Nuts application.
They can be bored too size for 1/2 12 single point threading and take a 3/4" wrench.
__________________
Drawing by Smartdraw
Reply With Quote
  #8  
Old 05-14-2019, 07:36 PM
DENedbalek DENedbalek is offline
Newbie
 
Join Date: Dec 2009
Location: Houston, TX
Posts: 8
Default

Quote:
Originally Posted by digr View Post
They can be bored too size for 1/2 12 single point threading and take a 3/4" wrench.
Ah, ok. I have some some 3/4" hex stock on hand so I wasn't thinking along those lines. Thanks for the feedback though.
Reply With Quote
  #9  
Old 05-14-2019, 07:52 PM
cutter's Avatar
cutter cutter is offline
Curmudgeon
 
Join Date: Jun 2004
Location: Lubbock,Texas
Posts: 32,681
Default

Or you could just order them.
I'm assuming you meant they're not available locally because there seems to be no shortage online.

possibly here

or here
__________________
cutter
Housekeeping Staff: the Gatekeeper
Director of Policy, Syntax and Grammar (by appointment)

"Dr. Chandran, will I dream?"

Just Keep Walking

"Passionate hatred can give meaning and purpose to an empty life. Thus people haunted by the purposelessness of their lives try to find a new content not only by dedicating themselves to a holy cause but also by nursing a fanatical grievance. A mass movement offers them unlimited opportunities for both."
Eric Hoffer The True Believer 1951
Reply With Quote
  #10  
Old 05-14-2019, 07:52 PM
greywynd's Avatar
greywynd greywynd is offline
I can dig it
 
Join Date: Dec 2005
Location: Wainwright, Alberta
Posts: 4,649
Default

1/2 12? Seems strange....are you sure it’s not metric?


Sent from my iPhone using ShopFloorTalk mobile app
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 06:32 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.