drill sharpening

[david lockwoodParticipant @davidlockwood10028]

[david lockwoodParticipant @davidlockwood10028]

Hi there all i am in the process of making a drill grinding jig for my cutter grinder to grind drills by the 4 or 6 facet method as i was shown at the Harrogate show last year. the problem is i have no idea what the clearance angles should be. any advice?   thanks in advance for any help

 

David

[VersabossParticipant @versaboss]

Hi David,

on my Meteor drill grinding machine (for small drills,  from 3 mm down) I use a primary angle between 4 and 7 deg. (4 for hard materials, 7 for soft stuff). The secondary angle is given by an end stop around 24 deg. Istr that I have seen similar values somewhere in ME (Chaddock article about drill grinding on the Quorn perhaps?), and think that a third angle would be over 40 deg. Take this with a grain of salt, maybe my memory ain’t what it once was 

Hansrudolf

[TerrydParticipant @terryd72465]

I don’t know if this is any use but it may be worth a look:

 

Quorn 

 

as may this place:

 

Colin Binnie 

 

Regards

 

terry

Edited By David Clark 1 on 12/05/2010 12:14:11

[CirclipParticipant @circlip]

Luv it Terry, wish DC1 would stop modding your long

 

 links and get the web design whiz  kids to sort it

 

 properly.

 

  Regards  Ian

 

  7th Jan & 4th Feb 94

 

 16th Aug & 20th Sept 96

 

 2 sets of articles in ME by D.A.G. Brown on 4 & 6 Facet grinding

 

  You got a PM David Lockwood

Edited By Circlip on 12/05/2010 12:15:55

Edited By Circlip on 12/05/2010 12:20:55

[David Clark 13Participant @davidclark13]

Hi There

Links carefully modified.

regards David

 

[david lockwoodParticipant @davidlockwood10028]

Thanks for the posts everyone. Terryd the links were very interesting

[Old RaftParticipant @oldraft]

Try http://www.gadgetbuilder.com/DrillSharp.html for "some" information.

If you find actual plans for any of the jigs mentioned please let me know.

[Author]

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