125 mm chuck onto my lathe

125 mm chuck onto my lathe

This topic has 3 replies, 4 voices, and was last updated 28 August 2025 at 16:11 by HOWARDT.

Viewing 4 posts - 1 through 4 (of 4 total)

Author

Posts
28 August 2025 at 15:11 #814239
Steve Huckins
Participant
@stevehuckins53362
My SC4 lathe has a 72mm register on the flange and this allows many 100 mm chucks with that size recess to fit.

Whilst currently making a Kennions Tina stationary engine, I realised the limit of jaws of 100 mm chucks don’t allow for holding anything round which is much over 1.75 inches. So it was difficult to machine the cylinder end caps which were a bigger diameter than this to begin with. ( I did manage it eventually ) Reverse jaws did not close enough to hold the end caps proud for machining.

But I was wondering if anyone has been able to fit a larger chuck onto a flange that only has this 72 mm recess as for instance, 125 mm chucks have a 95 mm recess. Is there an adaptor or alternative option to mount one ?

Advice always welcome thanks

Steve
Advert

28 August 2025 at 15:33 #814246
bernard towers
Participant
@bernardtowers37738
Adaptor płatę?
28 August 2025 at 15:43 #814248
JasonB
Moderator
@jasonb
Piece of 125mm steel or iron bar. Face one side and machine to fit the 72mm spigot, drill and tap for studs.

Mount to the spindle and face the otherside, turn larger spigot to suit a 125mm chuck, Mark position before removing to drill or tap chuck mounting hole sthen it can go back in the same position once the chuck is mounted.

Should have been able to do it with reversed jaws, you may need a bit more tool stickout to get below the outer step. Or better still get some soft jaws for the existing chuck from the likes of Rotagrip
28 August 2025 at 16:11 #814260
HOWARDT
Participant
@howardt
I have an SC3, which I bought about 9 years ago and fitted a 125mm four jaw chuck to it. Bought an adaptor plate to fit the spindle and machined it in situ to fit the chuck. Obviously an independent four jaw requires less accuracy than a non independent chuck.
Author

Posts

Viewing 4 posts - 1 through 4 (of 4 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
- boiler leak
  Started by: Bill Dawes in: Locomotives
- 12
- 24
- 28 August 2025 at 19:07
  Bill Dawes
- Bendy Flexible Plywood
  Started by: Henry Buckeldee in: Related Hobbies including Vehicle Restoration
- 14
- 16
- 28 August 2025 at 18:13
  Henry Buckeldee
- Lathe tool inserts
  Started by: Andy Brocklehurst in: Beginners questions
- 9
- 20
- 28 August 2025 at 18:08
  Diogenes
- Mercer comparator gauge repair help.
  Started by: Graeme Seed in: Workshop Tools and Tooling
- 3
- 4
- 28 August 2025 at 17:47
  Graeme Seed
- Museum donation
  Started by: Stephen Wessel 1 in: Introduce Yourself – New members start here!
- 4
- 6
- 28 August 2025 at 16:18
  Stephen Wessel 1
- 125 mm chuck onto my lathe
  Started by: Steve Huckins in: General Questions
- 4
- 4
- 28 August 2025 at 16:11
  HOWARDT
- interchangeable Myford beds
  Started by: Kundrus in: Manual machine tools
- 1
- 1
- 28 August 2025 at 16:09
  Kundrus
- Painting mating surfaces
  Started by: Martin Cooper in: Beginners questions
- 8
- 15
- 28 August 2025 at 15:17
  Richard Simpson
- Damp engine, Name?
  Started by: sivtek1 in: Stationary engines
- 6
- 14
- 28 August 2025 at 13:58
  cogdobbler
- Warco Super Major Milling Machine – Stripping Gearbox
  Started by: Lee Jones 6 in: Manual machine tools
- 7
- 10
- 28 August 2025 at 08:58
  jacobsmess
- Phone Phreaking
  Started by: Michael Gilligan in: Clocks and Scientific Instruments
- 13
- 17
- 28 August 2025 at 08:13
  Roger Hart
- What Did You Do Today 2025 1 2 … 9 10
  Started by: JasonB in: The Tea Room
- 36
- 231
- 28 August 2025 at 00:07
  howardb
- Granville lathe leadscrew change wheel 1 2
  Started by: JACK SIDEBOTHAM in: Help and Assistance! (Offered or Wanted)
- 13
- 31
- 27 August 2025 at 21:06
  Howard Lewis
- Weird electric actuator action
  Started by: ell81 in: Beginners questions
- 5
- 5
- 27 August 2025 at 17:42
  Robert Atkinson 2
- Marcus Oxen … illustrated notebook
  Started by: Michael Gilligan in: The Tea Room
- 2
- 2
- 27 August 2025 at 16:45
  Harry Wilkes
- Softening epoxy 1 2
  Started by: John Haine in: General Questions
- 21
- 38
- 27 August 2025 at 12:56
  Robert Atkinson 2
- Hereward
  Started by: Richard Simpson in: Model Boats
- 6
- 11
- 27 August 2025 at 11:06
  cogdobbler
- Imperial Bearing Surprise!
  Started by: Peter_H in: General Questions
- 4
- 4
- 27 August 2025 at 10:06
  tonychap
- QCTP for chester lathe 1 2
  Started by: Chris12 in: Beginners questions
- 12
- 32
- 27 August 2025 at 08:17
  Vic
- Bending copper tube?
  Started by: Bo’sun in: Workshop Techniques
- 13
- 16
- 27 August 2025 at 02:05
  cogdobbler
- The skill of the Victorian woodcut engraver
  Started by: vic newey in: The Tea Room
- 5
- 6
- 26 August 2025 at 22:12
  SillyOldDuffer
- Smart & Brown Model L lathe help required
  Started by: AJAX in: Manual machine tools
- 4
- 11
- 26 August 2025 at 21:40
  AJAX
- Myford VMB mill, head lift.
  Started by: lctikka61 in: Manual machine tools
- 3
- 3
- 26 August 2025 at 20:41
  Alan Wood 4
- Raab Style Heibluftmotor
  Started by: JasonB in: Miscellaneous models
- 3
- 7
- 26 August 2025 at 18:53
  JasonB
- 3.5″ Derby 4F – First Loco Build
  Started by: mattleicester in: Locomotives
- 5
- 5
- 26 August 2025 at 17:51
  paul rushmer

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