Author Topic: Squealing and judder  (Read 958 times)

Offline Prisoner#6

  • Newbie
  • *
  • Posts: 6
  • I'm a sharp craftsman!
    • View Profile
Squealing and judder
« on: November 12, 2017, 10:15:03 am »
Hello,
I am sometimes getting a squealing and slight juddering when grinding drill bits.
I assume this is due to the drill bit rubbing instead of cutting, but not sure why this should be happening.

Thanks for any help.

Offline cbwx34

  • Hero Member
  • *****
  • Posts: 1065
    • View Profile
Re: Squealing and judder
« Reply #1 on: November 12, 2017, 03:20:24 pm »
Hello,
I am sometimes getting a squealing and slight juddering when grinding drill bits.
I assume this is due to the drill bit rubbing instead of cutting, but not sure why this should be happening.

Thanks for any help.

I don't sharpen drill bits... but providing a bit more info may get you a better answer.  For example...
  • Are you using the drill bit jig?
  • Sharpening from the horizontal or vertical USB?
  • Stone graded coarse or fine?
  • Stone been trued?
  • Type of bit?

If you do a search for chatter (which is what I think you mean by judder?)... you'll find a few threads that might help.  (It seems to be more common with scissors).  (Do the search from the main forum page).

Offline Prisoner#6

  • Newbie
  • *
  • Posts: 6
  • I'm a sharp craftsman!
    • View Profile
Re: Squealing and judder
« Reply #2 on: November 12, 2017, 09:00:16 pm »
Hello and thanks for the reply.
I am using the DBS-22 jig.
Sharpening from the horizontal.
Black stone SB-250.
The stone is true.
HSS drill bits of various sizes.
118 point angle and 11 lip clearance angle.
I have also just noticed the drill bit holder slightly rocks when sharpening one side of the drill bit which maybe tells me the jig might not be 100% flat.

Thanks.



Online Ken S

  • Moderator
  • Hero Member
  • *****
  • Posts: 5206
    • View Profile
Re: Squealing and judder
« Reply #3 on: November 14, 2017, 11:41:14 am »
Welcome to the forum, Prisoner.

My experience with the DBS-22 is limited. I have not experienced the squealing. I tend to approach any new sharpening operation slowly and with light pressure. Also, I have only sharpened bits in the 3/8” to 1/2” (10 to 12mm) range.

I am concerned about the jig rocking.

I suggest, if you have not already done so, watching Alan Holrham's videos on the DBS-22. He has done two. I prefer the earlier, longer version. It goes into more depth. The shorter version is also good.

Keep us posted.

Ken

Offline RickKrung

  • Hero Member
  • *****
  • Posts: 518
  • Maker
    • View Profile
Re: Squealing and judder
« Reply #4 on: November 15, 2017, 03:46:33 am »
Welcome to the forum, Prisoner.

I suggest, if you have not already done so, watching Alan Holrham's videos on the DBS-22. He has done two. I prefer the earlier, longer version. It goes into more depth. The shorter version is also good.

Keep us posted.

Ken

The longer one:
https://www.youtube.com/watch?v=fSUa1iFUzkM

The shorter one:
https://www.youtube.com/watch?v=KqcMTxrIoPY

If you want nice clean, fresh oats, you must pay a fair price. However, if you can be satisfied with oats that have already been through the horse, that comes at a lower price.

Offline Prisoner#6

  • Newbie
  • *
  • Posts: 6
  • I'm a sharp craftsman!
    • View Profile
Re: Squealing and judder
« Reply #5 on: November 17, 2017, 08:53:26 pm »
Hello everyone,
I think I have solved the problem..........I was pressing too hard against the stone.
You were right Ken in your reply.

I have another problem though, but I'll ask that in a new post.

Online Ken S

  • Moderator
  • Hero Member
  • *****
  • Posts: 5206
    • View Profile
Re: Squealing and judder
« Reply #6 on: November 18, 2017, 03:56:39 am »
I think the forum is a valuable resource, almost as valuable as working through a problem yourself. It is important to combine the two. Others may have worked through the same problem. Or, your solution may help others. A win/win situation.

Bring on your next problem! (in its own topic)

Ken