G oog le BadWeB | Login/out | Topics | Search | Custodians | Register | Edit Profile


Buell Forum » Quick Board » Archives » Archive through August 08, 2011 » How do you get a broken tap out of a hole? « Previous Next »

  Thread Last Poster Posts Pages Last Post
Archive through July 27, 2011No_rice30 07-27-11  11:52 am
         

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Crashcourse411
Posted on Thursday, July 28, 2011 - 09:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

dremel brand makes diamond bits that work well, better than the burr style. Just cut right along the flutes. Then go up one size on the stud with the extra long heli coil, not the short ones, that the hardware store has, they usually have 3mm-5mm more threads.

Also lots of MagicTap, keep that trap from wobbling out the hole. Stud should go in snug, and not have any end play.

EDM is the other option, but that means taking off the head. Some machine shops can do this.

I'd be curious if Harley used, a roll tap to form the threads, the are much stronger in aluminum heads.
Top of pagePrevious messageNext messageBottom of page Link to this message

Reepicheep
Posted on Thursday, July 28, 2011 - 10:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The dremel diamond bits wouldn't do much more than make divots before they were toast. The tungsten carbide was what I needed to get through.
Top of pagePrevious messageNext messageBottom of page Link to this message

Aesquire
Posted on Thursday, July 28, 2011 - 10:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The timesert looks good, I've done a lot of helicoils, ( Nortons...brit butter aluminum ) and the Timesert looks better for drain plugs and other fluid tight applications.
yes, get the long helicoil. All the advice above that sounds good, is. ( shmart bunch of guys here )

Manual tapping is an arcane art. Modern machines torque limit the taps, or they'd shatter all the time. Taps are Very hard & brittle material. ( as you know all too well )
Depending on tap and material, I use maximum zen, gentle power, reverse often to break the chips, focus on straight.
Top of pagePrevious messageNext messageBottom of page Link to this message

Reepicheep
Posted on Friday, July 29, 2011 - 08:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

+1 Aesquire. The slower I go trying to tap a hole, the faster the job ends up finishing. Anything other than absurdly slow and I end up with a 4 to 8 hour detour of tap-ectomy headaches.
Top of pagePrevious messageNext messageBottom of page Link to this message

Etennuly
Posted on Friday, July 29, 2011 - 08:15 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Re-reading the title of this thread, I would suggest that you not put a broken tap into a hole.
« Previous Next »

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Post as "Anonymous" (Valid reason required. Abusers will be exposed. If unsure, ask.)
Enable HTML code in message
Automatically activate URLs in message
Action:

Topics | Last Day | Tree View | Search | User List | Help/Instructions | Rules | Program Credits Administration