Does size matter

Does size matter

This topic has 5 replies, 4 voices, and was last updated 26 April 2021 at 21:12 by Ian Skeldon 2.

Viewing 6 posts - 1 through 6 (of 6 total)

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26 April 2021 at 17:52 #36377
Ian Skeldon 2
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@ianskeldon2
Using a lathe
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26 April 2021 at 17:53 #541712
Ian Skeldon 2
Participant
@ianskeldon2
I very recently sold my Boxford lathe to make way for a larger unit. The buyer who collected the lathe only this Saturday just gone has kindly sent me a photograph showing the lathe in use. I would never have thought it possible to turn such a large item on this machine but the operator is very happy with the results.
26 April 2021 at 18:41 #541721
Mick B1
Participant
@mickb1
He might only be turning part of the shaft close to the chuck? Dunno if the crossslide would quite pass under the main barrel of the assembly.
26 April 2021 at 18:46 #541724
Jon Lawes
Participant
@jonlawes51698
It looks like he is skimming a commutator or slip ring without removing it!
26 April 2021 at 18:48 #541725
Howard Lewis
Participant
@howardlewis46836
Looks like the job is held in a three jaw chuck, so will not be as concentric as being set up in a four jaw.

If looking for that level of accuracy, the far end, in the steady could be clocked and set to run concentric within close limits.

Being the rotor from an electric motor, there will be a comparatively large air gap between the rotor and the pole pieces, so maybe a three jaw is sufficiently accurate, particularly when working close up as inn the photo.

If concentricity is not good enough, the risks are friction from non aligned bearings and out of balance forces.

Howard

Edited By Howard Lewis on 26/04/2021 18:50:17
26 April 2021 at 21:12 #541760
Ian Skeldon 2
Participant
@ianskeldon2
I did wonder what the part was, all I know is that he is very satisfied with the lathe so I guess it is cutting accurately enough for whatever it is he is doing, thanks for the info chaps.
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