Setting up s.b.9"

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steelshot
Posts: 2
Joined: Sun May 14, 2017 7:16 am

Setting up s.b.9"

Post by steelshot »

Need pic or description of how the motor mount plate faces,its a 1943 model c with a 3 hole flat plate with ears for bolt hinge.shape looks like a profile of a slice of meatloaf,or pound cake,ha ha,best description I can come up with.does curved end face lathe or away?
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Comstock-Friend
Posts: 157
Joined: Fri Apr 23, 2010 9:05 am
Location: Sun Valley, California

Re: Setting up s.b.9"

Post by Comstock-Friend »

Here's mine, rounded part to the back...
100_9407s.jpg
steelshot
Posts: 2
Joined: Sun May 14, 2017 7:16 am

Re: Setting up s.b.9"

Post by steelshot »

Thank you.I still have the leather belt,how do you think the link belt compares?
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wlw-19958
Posts: 1072
Joined: Fri Dec 22, 2006 5:41 pm
Location: Lewes, DE

Re: Setting up s.b.9"

Post by wlw-19958 »

Hi There,

If you look closely at the picture, this SBL 9" lathe
has the relatively rare V-belt drive. One wouldn't
use leather belts with this kind of drive.

If yours is the 3-step cone pulley (instead of the 4-step
V-belt drive), using a link belt wouldn't be a good idea.
There isn't enough surface area on a link belt to drive
the crowned pulleys efficiently.

There are leather belts, composite belts, automotive
serpentine belts, etc. that would be better IMHO. It
just depend on what you want. If this is your first lathe
and you don't have experience running a lathe, a leather
belt can save you if you should have a "crash." It will slip
off the pulley when that happens. You can change it later
after you gain experience.

Good Luck!
-Blue Chips-
Webb
SteveM
Posts: 7763
Joined: Mon Jun 27, 2005 6:18 pm
Location: Wisconsin

Re: Setting up s.b.9"

Post by SteveM »

wlw-19958 wrote:There are leather belts, composite belts, automotive
serpentine belts, etc. that would be better IMHO. It
just depend on what you want. If this is your first lathe
and you don't have experience running a lathe, a leather
belt can save you if you should have a "crash." It will slip
off the pulley when that happens. You can change it later
after you gain experience.
Good advice from Webb.

I would add that for some of the belts, notably the automotive serpentine belts, you have to take EVERYTHING apart to get them on, as there is no break in them, as there is on your leather belt.

Some composite belts are made with tapered ends that you glue together in place on the lathe, and some can even be had with the "clipper" lacing that allows you to pull the pin and take them off, just like your leather belt.

South Bend claimed 3/8" off the diameter stock removal in steel in one of their old catalogs, and that was using leather belts, so it's not like they can't work.

Steve
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wlw-19958
Posts: 1072
Joined: Fri Dec 22, 2006 5:41 pm
Location: Lewes, DE

Re: Setting up s.b.9"

Post by wlw-19958 »

Hi There,

There are some that cut and lace serpentine belts
so they don't have to disassemble everything. Personally,
I like leather belts. I skive them and glue them
together in place. If you keep them clean, they
do a credible job of power transmission. Composite
belts would be better and one can use "Clipper" type
joints to put them together (I guess serpentine belts
could be attached this way too).

Just some more food for thought.

Good Luck!
-Blue Chips-
Webb
Glenn Brooks
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Joined: Mon Nov 10, 2014 1:39 pm
Location: Woodinville, Washington

Re: Setting up s.b.9"

Post by Glenn Brooks »

IMG_1295.JPG
IMG_1296.JPG
IMG_1297.JPG
Here is how I mounted my SB 9" back gear to a 1919 Dalton Lathe. Same principle as if it were your SB lathe, except you probably have a threaded hole on the backside of the ways, near the headstock to attach the tensioning rod and handle. The last photo above shows a stand alone post I made to anchor the tensioning assembly to the backplate.

I use an automotive serpentine belt and am very happy with it. If I overload the cut, it just slips and sometimes comes off the cone pulley - no problem.

BTW. I used a not so cheap HF link belt on my grizzly mill drill for a while. Needed an emergency replacement and had this hanging on my tool board. It worked surprising well, even twisted and distorted into a hideous half upside down position. Finally replaced it with a proper large industrial thickness v belt. But, learned these things are impressive in V shaped pulleys. Very durable material and easy to install.

Good luck,
Glenn
Moderator - Grand Scale Forum

Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge

Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
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