Broken tap

mirage100

mirage100

Active User
H-M Lifetime Diamond Member
I got a broken tap in a 5 hp mini bike engine. It is inside of the crank where the clutch bolts on. I have had luck with a carbide drill bit drilling it. It is a mess down in there. I have ordered a solid carbide 3/8 2 flute Endmill. How fast should I turn the Endmill? I looked all over the black book but I can’t find any info on speed for this end mill. PS does anyone else find it hard to find the info you want in the black book? Guess I need to take a class on how to read the black book.
 

Engineers Black Book: Machinist and Manufacturing Reference Book

The Engineers Black Book is a Pocket Sized Reference Guide for Machinist's, Engineers, Designers and Makers. It contains 172 Full colour, Tear Resistant Pages.
www.engineersblackbook.com www.engineersblackbook.com

Did you try a diamond bit?
I have had good success using diamond bits in a dremel and lubricant to cool it. Takes time but cheaper than a new engine.
Pierre
 
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I'm guessing at about 400 RPM, I did one with a 1/4 solid carbide endmill, was turning about 600 RPM.
 
A black book is a quick reference guide for engineers and machinist.Got all kinds of good info you need to know about a lot of stuff we do.
 
I use carbide ball end mills for broken taps and do it very often . The BEMs hold up much better than regular end mills . You better have a very rigid set-up or consider the end mill toast . Keep it oiled as much as possible also and get the HSS " dust" out of the hole as best as possible .
 
This problem was inherited. The tap is broken way down in the shaft. Really can't even see in there while you are machining it
 
mmcmdl said:
I use carbide ball end mills for broken taps and do it very often . The BEMs hold up much better than regular end mills . You better have a very rigid set-up or consider the end mill toast . Keep it oiled as much as possible also and get the HSS " dust" out of the hole as best as possible .
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Thank you I will.
 
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