Acquired a SB 9 Junior recently. It is model # 722-AC (4' bed), made in 1928. It has the a self contained motor drive unit. Don't have a bench for it yet. However, I did temporarily mount it on a pallet and some wood, and it appears to run very well and strong. No attempts to cut anything until I get it mounted on a proper bench. Beefy little lathe. Here are some photos.
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SB 9 Junior
- Thread starter ShagDog
- Start date
- Joined
- Dec 6, 2015
- Messages
- 809
Any questions, post them. There used to be a yahoo group for junior lathes, but yahoo passed those out. We have enough people here to help out. I will be subscribing here, just in case. The junior was the best thing that happened to me... it opened up a different world.
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Nice Lathe! You will be wanting one of these: https://www.ebay.com/itm/2713900535...1291&msclkid=d1f21c0f462112a059cc78a99f0bb925
Thanks, OTmachine. I do have a tool post set-up for my SB 9a that I could use interchangeably but with different tool holders; but, that one in the link appears to be a nice set at a reasonable price. Do you have one?
Thanks, silverhawk. I was hoping you would respond. My research on this site has shown you as having a Junior for a while now. I certainly have questions now, particularly with regard to the spindle bearings. On my SB9a, you have to press the spindle on and off; On the Junior, will it just lift out with the whole gear and pulley assembly by removing the bearing caps? There are new machine shop made bearings in it now; but, per the seller, there are no flanges, so he used washers on the front bearing between the spindle flange and the headstock casting. Seems to run well in this configuration as there was no heating of the bearing areas when run for a while. Have not checked the bearing adjustment yet.
However, I do have the old bearings that I was considering using; but it appears that someone put some oil paths in it which may or may not have been a good thing. Also wondering if the old bearings are maybe worn thin; but, they look to be in good condition. Also, are there shims that go where the bearing caps mount to the headstock, like on the SB 9a?
I need to get it up off the ground (my old back and legs won't take too much more bending and stooping). Looking for a bench. In the meantime, here are some photos of the old bearings as well as the washers, one of which is a thrust washer.
Thanks, silverhawk. I was hoping you would respond. My research on this site has shown you as having a Junior for a while now. I certainly have questions now, particularly with regard to the spindle bearings. On my SB9a, you have to press the spindle on and off; On the Junior, will it just lift out with the whole gear and pulley assembly by removing the bearing caps? There are new machine shop made bearings in it now; but, per the seller, there are no flanges, so he used washers on the front bearing between the spindle flange and the headstock casting. Seems to run well in this configuration as there was no heating of the bearing areas when run for a while. Have not checked the bearing adjustment yet.
However, I do have the old bearings that I was considering using; but it appears that someone put some oil paths in it which may or may not have been a good thing. Also wondering if the old bearings are maybe worn thin; but, they look to be in good condition. Also, are there shims that go where the bearing caps mount to the headstock, like on the SB 9a?
I need to get it up off the ground (my old back and legs won't take too much more bending and stooping). Looking for a bench. In the meantime, here are some photos of the old bearings as well as the washers, one of which is a thrust washer.
Attachments
Yes, I have one of the ones that I listed. Bought it about 10 years ago for the same price. Quality on mine is good. I like the wedge lock over the piston type. I have Aloris, Bostar, Enco, and some other QCTP’s. For the money, the Bostar works good And the Accu-size tool holders on Amazon fit good. There is a lot of deviations on tool holder dimensions amongst brands.
I would prefer to have the thrust washers integral / one piece with the bearing shells. The only problem that I see with the old bearings with the added oil paths is that it looks like the paths extend out to the edges, possibly leaking oil out too soon. Perhaps if you added some wicks in the grooves? I have some drip oilers that I was going to put on my JR. My big Hamilton, 16 x 96”, has drip oilers, and they work good. My SB9A UMD has Gitz oilers and seem to work. HTH, Keith
I would prefer to have the thrust washers integral / one piece with the bearing shells. The only problem that I see with the old bearings with the added oil paths is that it looks like the paths extend out to the edges, possibly leaking oil out too soon. Perhaps if you added some wicks in the grooves? I have some drip oilers that I was going to put on my JR. My big Hamilton, 16 x 96”, has drip oilers, and they work good. My SB9A UMD has Gitz oilers and seem to work. HTH, Keith
- Joined
- Feb 28, 2019
- Messages
- 499
That's a nice lathe! Cute little thing. looks a lot like the standard 9. I'm assuming that "junior" just means smaller/lighter.
Note: You will more than likely have to modify the T-nut to fit.
Actually, the "Junior" designation is before the standard 9a, b and c. And it is a misnomer as to size in comparison. It is also known as a "Wide Bed". The ways are further apart and it is more beefy than my 9A. Weights a little more too.
No problem. Just ordered it by the way.