Sieg SC-3 Lathe, Taper Bearing Fitment

[Ghosty]

Hi All,
Started with the replacement of the OEM bearings with taper bearings.
Removed the feed screw drive cover and the drive gearing.

 

[Ghosty]

Checked positioning of drive gear.

 

[Ghosty]

Removed chuck after indexing shaft to aid in reassembly

 

[Ghosty]

Removed shield screw, so shield could be moved out of way of dust cover.

 

[Ghosty]

Removed the dust cover, loosened motor mounts, removed belt, gears, spacer's and key, spacer's are plastic, will make new alloy ones

 

[Ghosty]

Removed shaft and bearings. Had to go to a friends place to remove the bearing from the shaft in a press.

 

[Ghosty]

Fitted the new outer bearing shells.

 

[Ghosty]

Fitted bearing to shaft and refitted shaft.(Make shore that the dust cover is fitted to the shaft before fitting bearing) Only tighten just enough to seat the bearings. Re-fit front dust cover.

 

[Ghosty]

Re-check position of the driven pulley.

 

[Ghosty]

Re-assembled the shaft gears so I could make up the new spacers

 

[Ghosty]

Machined the new spacers. The lathe is already running smother than with the old bearings, still have to re-centre the chuck.

 

[Ghosty]

Re-assembled the drive with the new spacers, first spacer is only .5mm smaller dia than the dust cover. Set the preload and checked the machine operation. Very happy with it.

 

[Ghosty]

Finished assembly of the feed screw gear system, I very seldom us this feature.

 

[Ghosty]

Will spend tomorrow re-centring the chuck, and then testing it out as I have some brass bushes to make.

Cheers

 

[oldboy]

Great write up. Good job. I done this ages ago, I have a Real Bull 7 X 14, the new bearings will make a big difference.

Barry.

 

[Blogwitch]

G,

Very nicely done.

If you really want to improve your lathe, then have a look at fitting tapered gibs.

I brought back a mini lathe from the edge by uprating it and one of those mods was tapered gibs. It turned it from being bent like a banana to a very accurate precision lathe.

[ame]https://www.youtube.com/watch?v=YoxxeJ2aI2U[/ame]

[ame]https://www.youtube.com/watch?v=GnL3ipa7JO8[/ame]

Unfortunately, the site I refer you to has the same problem with some of my posts on here, the pictures are missing from when Photoshop lost all mine.


John

 

[oldboy]

Hi John,

I have seen the article, "Fixing Darrens Lathe". It is a very a very good write up for the mini lathe's. Am disappointed that the photos have disappeared. Would it be possible to get a copy of them, as I know they are very informative? My email is [email protected]. Scrollsawer61 is also my Skype name.

Thankyou,
Barry

 

[oldboy]

Hi John,
Sorry for the second post. I forgot to add that I am about to try and fit tapered gibs that why I was looking up you article. I have only had my lathe and mill since retiring, so still learning everything.

Thanks again
Barry.

 

[Blogwitch]

Barry,

Email with 125 pictures sent. I do hope that you manage to get the job done, it really does make a massive difference to the lathe.
I have tapered gibs on both my lathe and mill, and once set correctly, they shouldn't need doing again unless you have to disturb them for some reason.

Chuck Fellows also did an article on fitting tapered gibs, I don't know if it was on here or on Madmodders, it was such a long time ago and as far as I can remember it was only a basic type of fitting not requiring as much machining, as I was putting the WHOLE lathe right at the time, so I was machining all sorts to get things square and level, putting things right as I went along.

John

 

[Ghosty]

First test run, just to check finish

[ame]https://www.youtube.com/watch?v=Itbo4kEkvz0[/ame]