2.05mm or #45?

2.05mm or #45?

This topic has 26 replies, 17 voices, and was last updated 16 December 2018 at 17:12 by mechman48.

Viewing 2 posts - 26 through 27 (of 27 total)

Author

Posts
16 December 2018 at 09:53 #385897
colin hawes
Participant
@colinhawes85982
Normally a 2.1 drill would be used for M2.5 thread as there is likely to be slight deformation of most materials as well as the cutting action and that extra 0.05 mm allows for that. Colin
Advert

16 December 2018 at 17:12 #385990
mechman48
Participant
@mechman48
Posted by Hopper on 16/12/2018 05:34:46:

Posted by Vic on 15/12/2018 18:39:16:…

…so I’m reasonably confident of shank size. …

No point in measuring shank size. The shank, and first parts of the flutes, are made to be smaller diameter than the tip, for clearance. Maybe more meaningful to measure the tip diameter. But the size of hole depends also on how the tip is sharpened. If it's a bit off-centre, the resulting hole will be slightly larger than the tip diameter, as is usually the case.

+1 … Also take note that often the drill bit can run eccentric on many of these small bits … bent! … I tend to use one size less for small drills like these… 2.1 etc.

George.
Author

Posts

Viewing 2 posts - 26 through 27 (of 27 total)

Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

Code of Conduct

Latest Replies

Viewing 25 topics - 1 through 25 (of 25 total)

- Topic
- Voices
- Posts
- Last Post
- Parting off on a mini lathe 1 2
  Started by: Andy Brocklehurst in: Beginners questions
- 19
- 26
- 4 September 2025 at 08:34
  Dell
- Arc’s 25mm indexable end mills…
  Started by: gerry madden in: General Questions
- 6
- 7
- 4 September 2025 at 07:31
  JasonB
- Bridgeport Series 1, table power feed.
  Started by: Daedalus in: Manual machine tools
- 2
- 2
- 4 September 2025 at 05:06
  Barry Smith 4
- Alternatives for a DRO display change
  Started by: John Hinkley in: General Questions
- 9
- 25
- 4 September 2025 at 04:40
  Barry Smith 4
- Chimney turning
  Started by: dave22 in: Beginners questions
- 2
- 4
- 3 September 2025 at 22:39
  noel shelley
- Swing over bed limitation for flywheels
  Started by: Steve Huckins in: General Questions
- 15
- 22
- 3 September 2025 at 21:25
  Engine Builder
- An Unexpected Message
  Started by: Michael Gilligan in: The Tea Room
- 6
- 8
- 3 September 2025 at 21:12
  Michael Gilligan
- Play on warco mini lathe saddle
  Started by: Michael Callaghan in: Manual machine tools
- 4
- 9
- 3 September 2025 at 17:50
  Howard Lewis
- Safe and secure way to suspend a 5″G Tender
  Started by: Greensands in: Locomotives
- 6
- 7
- 3 September 2025 at 14:51
  Nealeb
- Denford Orac refit
  Started by: Richard Evans 2 in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 5
- 19
- 3 September 2025 at 14:30
  Stuart Smith 5
- design and use of cutting tools
  Started by: john mostyn in: Books
- 8
- 9
- 3 September 2025 at 14:25
  cogdobbler
- What Did You Do Today 2025 1 2 … 9 10
  Started by: JasonB in: The Tea Room
- 38
- 244
- 3 September 2025 at 13:05
  Vic
- Vallder CNC
  Started by: Michael Gilligan in: CNC machines, Home builds, Conversions, ELS, automation, software, etc tools
- 1
- 1
- 3 September 2025 at 08:38
  Michael Gilligan
- Big Vise, go big or go home
  Started by: conrod in: Workshop Tools and Tooling
- 6
- 6
- 2 September 2025 at 20:00
  old mart
- St Albans Big Show 27 & 28 Sept 25
  Started by: Bazyle in: Exhibitions, Shows and Club Events
- 2
- 3
- 2 September 2025 at 16:25
  Bazyle
- Exeter & District Model Engineers Show – 7 Sept
  Started by: Bazyle in: Exhibitions, Shows and Club Events
- 1
- 1
- 2 September 2025 at 16:22
  Bazyle
- Task Light
  Started by: Vic in: Work In Progress and completed items
- 2
- 3
- 2 September 2025 at 15:15
  Vic
- alchin transfers
  Started by: joseph tatler in: Traction engines
- 4
- 4
- 2 September 2025 at 13:19
  Clive Brown 1
- Watercress Queen
  Started by: Diogenes in: Locomotives
- 3
- 3
- 2 September 2025 at 12:38
  JA
- NU tool milling machine
  Started by: joseph tatler in: Manual machine tools
- 8
- 13
- 2 September 2025 at 10:31
  joseph tatler
- Newbie
  Started by: seanieboy in: Introduce Yourself – New members start here!
- 4
- 4
- 2 September 2025 at 10:25
  Howard Lewis
- Feed Water 1 2
  Started by: Richard Simpson in: General Questions
- 16
- 31
- 2 September 2025 at 09:44
  noel shelley
- Looking for a quality pencil sharpener
  Started by: Greensands in: The Tea Room
- 11
- 13
- 2 September 2025 at 08:56
  Richard Simpson
- Softening epoxy 1 2
  Started by: John Haine in: General Questions
- 23
- 42
- 2 September 2025 at 04:23
  John Haine
- Thread form of medical ‘screws’.
  Started by: JimmieS in: The Tea Room
- 7
- 11
- 1 September 2025 at 20:45
  JimmieS

Viewing 25 topics - 1 through 25 (of 25 total)

View full reply list.

Latest Issue

September 2025

Buy Latest/Back Issues

Newsletter Sign-up

Latest Replies