The Shop > Tools
How are four facet drills shapened on a tool and cutter grinder?
sparky961:
There's not much more to say than the title/question itself. I'm asking in relation to what I believe is a "Deckel" style grinder, of which there are now many clones available. I suppose the question extends to other machines as well, if the method differs.
The main concept I'm not getting is how you get the point centered in a reliable, repeatable way. I've seen some videos of four facet grinding where they just sneak up on it for the secondary facet, but I'm looking for something faster and more accurate than this.
Metalman:
sparky
You may find some useful information within the video for which I have just added a thread.
Also from my website page here http://www.homews.co.uk/page360.html
Harold
sparky961:
Thanks, Harold. I watched your video in the hope of just that, but I found that you've only added to the confirmation thar current DIY methods could be improved upon.
Your results look very good but I'm still not comfortable with the idea of sneaking up on the point to make it meet in the centre. For a small HSS drill, the time spent getting it right is just too great. Being honest with me, and yourself, how long does your method take to resharpen a 3/8 drill that isn't completely trashed?
b4dyc:
Hi
Not sure if you have seen Johns web page http://www.gadgetbuilder.com/DrillSharp.html
That drill grinder will grind around a central pivot point and achieve fairly quick results
sparky961:
--- Quote from: b4dyc on March 12, 2017, 07:40:17 PM ---Hi
Not sure if you have seen Johns web page http://www.gadgetbuilder.com/DrillSharp.html
That drill grinder will grind around a central pivot point and achieve fairly quick results
--- End quote ---
Yes, I've seen it. I was a bit confused as to how the pictures and descriptions matched up. There's a lot of information on that page and not very well organized.
If you can narrow it down for me which one you're referring to and how it works I'd be grateful.
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