Watchcase back

This topic has 2 replies, 2 voices, and was last updated 8 October 2025 at 08:51 by Dave S.

Viewing 3 posts - 1 through 3 (of 3 total)

Author

Posts
6 October 2025 at 20:38 #819104
Dave S
Participant
@daves59043
Used my CNC to make the back of the case for my brass watch (see here)

Titanium, started out as 2.8mm thick.

Finish is super, shame that it doesn’t quite fit…

I need to measure it to figure out why, but that’s a tomorrow thing.

Suspect its a combination of things, mostly starting with me making the model from the CAD hole and forgetting that in the real world there is a need for clearance and tolerance on 2 parts which mate.

Dave
Advert

7 October 2025 at 18:21 #819245
old mart
Participant
@oldmart
In the video, it looks like the outside is concave, the edges seem to be thicker towards the corners. Making a joint size for size also makes it a press fit, and even more difficult when the shape is rectangular and not round.
8 October 2025 at 08:51 #819306
Dave S
Participant
@daves59043
It’s concave in in direction, so it wraps the wrist more nicely.

Size for size is a CAD mistake – I just didn’t think about it properly.

However the hole it goes in is ~0.1mm per side to small (0.2mm overall). That’s suspiciously like a finish pass missing in the gcode.

The Ti is ~0.05mm oversized, which might be needing a spring pass I guess.

Not done much Ti machining.
Author

Posts

Viewing 3 posts - 1 through 3 (of 3 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.

Advert

Latest Replies

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

- Topic
- Voices
- Posts
- Last Post
- Fusion CAD / CAM Problem
  Started by: Shaun Churchill in: CAD – Technical drawing & design
- 2
- 2
- 8 June 2026 at 20:10
  JasonB
- Cheap digital spirit level accuracy 1 2
  Started by: Mick Bailey in: Workshop Tools and Tooling
- 18
- 38
- 8 June 2026 at 18:49
  duncan webster 1
- S,O,D 1 2
  Started by: larry phelan 1 in: The Tea Room
- 27
- 30
- 8 June 2026 at 18:14
  Roderick Jenkins
- Improving a 30 taper fit
  Started by: Andrew Skinner in: Manual machine tools
- 11
- 18
- 8 June 2026 at 17:11
  bernard towers
- where to find locomotive / train plans ?
  Started by: zuji miko in: Beginners questions
- 5
- 7
- 8 June 2026 at 16:32
  JA
- 4 cylinder rotary valve
  Started by: AStroud in: Work In Progress and completed items
- 5
- 13
- 8 June 2026 at 16:15
  AStroud
- Breaking gears in a Myford ML7
  Started by: drnewcomb in: Manual machine tools
- 13
- 19
- 8 June 2026 at 15:20
  old mart
- What Did You Do Today 2026 1 2 … 4 5
  Started by: JasonB in: The Tea Room
- 34
- 112
- 8 June 2026 at 12:58
  renardiere7
- PVC joints
  Started by: Speedy Builder5 in: Workshop Techniques
- 6
- 10
- 8 June 2026 at 12:44
  blowlamp
- Lightning
  Started by: duncan webster 1 in: Electronics in the Workshop
- 12
- 25
- 8 June 2026 at 12:40
  duncan webster 1
- Myford VMC Spindle Advice Please.
  Started by: Nigel Graham 2 in: Manual machine tools
- 7
- 14
- 8 June 2026 at 10:19
  Bazyle
- digital microscope for poor eyesight
  Started by: bernard towers in: Electronics in the Workshop
- 9
- 13
- 8 June 2026 at 08:13
  Dell
- Replacement Allbrit Draftmaster Protractor Rulers
  Started by: wigan2026 in: Workshop Tools and Tooling
- 6
- 10
- 7 June 2026 at 19:51
  Grindstone Cowboy
- New to me Denbigh Power Hacksaw
  Started by: southernchap in: Manual machine tools
- 4
- 4
- 7 June 2026 at 12:14
  peak4
- ChatGPT … getting close to passing the Turing Test 1 2
  Started by: Michael Gilligan in: The Tea Room
- 15
- 35
- 7 June 2026 at 10:34
  alecs
- ML7: top slide feed screw washers?
  Started by: drnewcomb in: Manual machine tools
- 3
- 3
- 7 June 2026 at 10:23
  John Haine
- Taylor Hobson Pantograph Engraver Model D
  Started by: jaCK Hobson in: Workshop Tools and Tooling
- 7
- 18
- 6 June 2026 at 20:51
  Charles Jambon
- Table in the Mk1 Clarkson cutter grinder manual.
  Started by: Andrew Tinsley in: General Questions
- 3
- 6
- 6 June 2026 at 18:12
  Andrew Tinsley
- Band saw 1 2 3
  Started by: Peter Simpson 3 in: Beginners questions
- 23
- 70
- 6 June 2026 at 18:02
  Adam Harris
- Tapping Trick
  Started by: Steve Withnell in: Workshop Techniques
- 10
- 11
- 6 June 2026 at 17:43
  John Purdy
- My week this week! My workshop videos 1 2 … 12 13
  Started by: Phil Whitley in: The Tea Room
- 16
- 321
- 6 June 2026 at 16:15
  Phil Whitley
- Warco GH600 Upgrades (DRO and Bed Protection)
  Started by: Richard Kirkman 1 in: Work In Progress and completed items
- 4
- 12
- 6 June 2026 at 12:41
  Richard Kirkman 1
- Price of A Mk2 Clarkson cutter grinder.
  Started by: Andrew Tinsley in: General Questions
- 5
- 5
- 6 June 2026 at 08:35
  Adrian R2
- Richard B’s Minnie.
  Started by: Richard B in: Traction engines
- 4
- 20
- 4 June 2026 at 21:09
  Richard B
- New member..
  Started by: wigan2026 in: Introduce Yourself – New members start here!
- 5
- 5
- 4 June 2026 at 16:19
  Harry Wilkes

Watchcase back

Watchcase back

Latest Replies

Latest Issue

May 2026

Newsletter Sign-up

Latest Replies