×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

helicoil tap

helicoil tap

helicoil tap

(OP)
For some reason i'm having trouble on tapping for helicoil inserts. I have a 1/2-13 insert and putting it into 304SS as far as i can see online I need to drill a 0.53" hole and use a 1/2-13 STI tap. (first of all am I correct so far?)

I ruined a tap already, it appears the hole is a little too small.

RE: helicoil tap

Interesting that my Heli-Coil manual recommends a 0.531 drill for steel, but specifies the minor diameter after tapping as 0.5166/0.5273

Is it possible that you have a form tap?  The minor before tapping would be 0.557 for a theoretical 75% thread.
 

Software For Metalworking
http://closetolerancesoftware.com
 

RE: helicoil tap

(OP)
It's a straght fluted tap and I'm thinking were having problems evacuating the chips causing it to break. Trying a spiral flute next

RE: helicoil tap

304 can be gummy.  Raise coolant concentration to 10% or use dedicated fluid, and peck tap if you are going more than 1.5xD.  Lube can be a MAJOR issue.  If you are doing a blind hole with straight flute, good luck.  I think most problems there can be solved with a good designed tap and better lube.  

 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources