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Topics - Petromax

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#1
General Tormek Questions / How to grind a HSS toolbit for a metal lathe
January 01, 2016, 03:39:48 PM
Hello guys,

I was wondering how to grind/sharpen HSS toolbits for my metal lathe. These bits are quite complicated to grind because there are many important angles. Has anyone find out a technique for this job?

https://youtu.be/Mn9jpqI8rao


Regards
#2
Drill Bit Sharpening / Drill sharpening: What am I doing wrong?
December 27, 2015, 05:36:55 PM
I tried to grind several drills. The result seems to be okay, but after drilling just one hole in mildsteel, the point of the drill is getting blue. My conclusion is that the drill is overheated at the very top of the drill. The cutting performance is not very bad, but I expected more.

What am I doing wrong?

(HSS drills 8..10mm, 118° top angle, 11° cutting angle)

https://www.dropbox.com/s/q63r507ob287x51/20151227_141004.jpg?dl=0
https://www.dropbox.com/s/41g87wfkezm6ktr/20151227_141122.jpg?dl=0
https://www.dropbox.com/s/y0ld6ohofocj9dl/20151227_141424.jpg?dl=0

I took this picture after drilling one hole.

https://www.dropbox.com/s/w4i98xklp3jha2k/20151227_142217.jpg?dl=0
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