NewtonTesla systems

This topic has 53 replies, 22 voices, and was last updated 16 November 2017 at 16:37 by martin ranson 2.

Viewing 4 posts - 51 through 54 (of 54 total)

← 1 2 3

Author

Posts
15 November 2017 at 10:06 #327269
Stephen Follows
Participant
@stephenfollows82099
Martin,

What lathe did you fit it to? The question for me is Myford bearings, whether they will stand up to 2000rpm. Seems not according to most replies. Upgrading to Bronze costs around £330. Silly Money! I can buy a mini lathe for approx. £500, less than bearings and inverter system.
Advert

16 November 2017 at 07:48 #327418
martin ranson 2
Participant
@martinranson2
Stephen … I fitted the unit onto a Proxxon PD 400 lathe … lovely item but not a huge machine … the headstock bearings are 2 opposed taper roller bearings … I tried to find out what their maximum speed should be but it is not listed anywhere … maybe it is quoted in the literature for some of the new machines.

martin
16 November 2017 at 08:27 #327421
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Stephen Follows on 15/11/2017 10:06:23:

The question for me is Myford bearings, whether they will stand up to 2000rpm.

.

I doubt if it really answers your specific question, but this is worthy of note:

[quote]

JOURNAL BEARING DESIGN

The simplest form of journal bearing is a plain circular bushing with an ID that is slightly larger than the shaft OD. Early bearings were often made by pouring the babbitt or white metal directly into a sleeve containing the actual shaft or a same-size mandrel. Then, the surface of the babbitt was scraped to provide the desired clearance. This success of this procedure was highly dependent upon the skill of the mechanic.

[/quote]

Taken from this excellent paper: **LINK**

http://edge.rit.edu/edge/P14453/public/Research/2-_LEADER_-_Understanding_Journal_Bearings.pdf

Frankly; I think your question is unanswerable … simply because there are so many variables:

Myford bearings, in top condition and suitably lubricated, should take the speed if lightly and evenly loaded, BUT if you subject the bearings to heavy and/or intermittent loading then all bets are off.

MichaelG.
16 November 2017 at 16:37 #327497
martin ranson 2
Participant
@martinranson2
Stephen … I was trying to find the fastest speeds for the Proxxon … in one section with the original motor fitted it does quote 1400 RPM … if I remember rightly this produced a lot of vibration at speed … I was looking through the arc euro trade catalogue ( http://www.arceurotrade.co.uk ) at the taper roller bearings they sell … they do not list the maximum speed the bearings will stand but it may be quite a bit higher than 2000 RPM … possibly a call to them would yield the information you want … that does assume that you want to cannibalise your lathe to fit roller bearings ????

martin
Author

Posts