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Does anybody have a 9" SB with a similar configuration? My 1941(?)
"Precision Model A" headstock has Timken roller bearings and no back gear
(as seen from the attached photo). Nothing hangs off of the two ears on the
headstock casting. With the headstock 3-step cone-pulley along with another
4-step jack-shaft on the floor-mount pedestal I get 12 speeds. The
jack-shaft and motor were cobbled together from pillow blocks and a
non-reversing repulsion motor. I'd like to re-engineer the power train
starting with a TEFC 1 HP induction motor and possibly add a two-step pulley
setup off the motor shaft in order to get the equivalent of a back-gear.
Spindle speeds? I'd like to end up with 25-2100 RPM. I would imagine the
roller bearings could handle the high speed safely. Flat belt? has anybody
purchased a belt and cement from SBL? Others? Cost? Is it worth machining
v-belt pulleys and getting rid of all that flat belt stuff? I read/heard
that flat belt slip is a good safety factor if you should crash your cutter
into the chuck (or whatever).

BTW, surfing the SBL web site I found more history/documentation on the 9"
series at:


Paul R. Hvidston
Upland, CA

Paul
I put one of those on my machine in 1977 when the leather belt went
south. As I remember the cost then was about $50, I do not know what
it would cost now. That belt is still working fine with no problems
except the saftey slip today. Sure saves the machine on crashes. For
another option I would use the same belts from McMaster-Carr that I
am using on the Burke mill, but you will have to take the head apart
to fit it.
JWE


--- In southbendlathe@..., "Paul R. Hvidston"
<p.hvidston@i...> wrote:

Does anybody have a 9" SB with a similar configuration? My 1941(?)
"Precision Model A" headstock has Timken roller bearings and no

back gear

(as seen from the attached photo). Nothing hangs off of the two

ears on the

headstock casting. With the headstock 3-step cone-pulley along with

another

4-step jack-shaft on the floor-mount pedestal I get 12 speeds. The
jack-shaft and motor were cobbled together from pillow blocks and a
non-reversing repulsion motor. I'd like to re-engineer the power

train

starting with a TEFC 1 HP induction motor and possibly add a two-

step pulley

setup off the motor shaft in order to get the equivalent of a back-

gear.

Spindle speeds? I'd like to end up with 25-2100 RPM. I would

imagine the

roller bearings could handle the high speed safely. Flat belt? has

anybody

purchased a belt and cement from SBL? Others? Cost? Is it worth

machining

v-belt pulleys and getting rid of all that flat belt stuff? I

read/heard

that flat belt slip is a good safety factor if you should crash

your cutter

into the chuck (or whatever).

BTW, surfing the SBL web site I found more history/documentation on

the 9"

series at:


Paul R. Hvidston
Upland, CA

Paul,

I checked with a local electrical supplier and there are a number of
nice little AC frequency drive which will give you a variable speed
control with any 110/220V AC motor. It will also give you reversing
capablities and they are about $200- 300 dollars.

You can do away with all those counter shafts and jsut still with one
speed.

Here is a list of some of the Brand name drives.

Allen-Bradley
Mitsubishi
Toshiba
Sumitomo
Westinghouse
GE
Reliance
T.B. Woods
Asea Brown Boveri (ABB)
Siemens





--- In southbendlathe@..., "Paul R. Hvidston"
<p.hvidston@i...> wrote:

Does anybody have a 9" SB with a similar configuration? My 1941(?)
"Precision Model A" headstock has Timken roller bearings and no back

gear

(as seen from the attached photo). Nothing hangs off of the two ears

on the

headstock casting. With the headstock 3-step cone-pulley along with

another

4-step jack-shaft on the floor-mount pedestal I get 12 speeds. The
jack-shaft and motor were cobbled together from pillow blocks and a
non-reversing repulsion motor. I'd like to re-engineer the power

train

starting with a TEFC 1 HP induction motor and possibly add a

two-step pulley

setup off the motor shaft in order to get the equivalent of a

back-gear.

Spindle speeds? I'd like to end up with 25-2100 RPM. I would imagine

the

roller bearings could handle the high speed safely. Flat belt? has

anybody

purchased a belt and cement from SBL? Others? Cost? Is it worth

machining

v-belt pulleys and getting rid of all that flat belt stuff? I

read/heard

that flat belt slip is a good safety factor if you should crash your

cutter

into the chuck (or whatever).

BTW, surfing the SBL web site I found more history/documentation on

the 9"

series at:


Paul R. Hvidston
Upland, CA

jwtaylor,

Interesting idea, and I was considering using a 3-phase motor and vari-drive
I could get for under $100. The problems are torque and price. At lower
spindle speeds I'm not convinced that there will be enough torque to machine
large workpieces using a vari-drive. Gear reductions should provide more
torque than the flat belt can transmit w/o slip.

BTW, who is using flat belts (leather or other) on their lathe? James Early
recommended (I believe) High-Speed Rubber Belts from McMaster-Carr, page 827
for $0.26/inch pre-made. Any thoughts from anybody about that? I called SBL
and they want over $100.00 for a 3/4" x 53" belt and cement kit. Yikes!

Cheers!

Paul R. Hvidston
Upland, CA

I have been told that using a AC Drive, you will not loose any torque
at the high or low end of the scale.

I will get some detailed information on this and post it after
christmas.

Jim

--- In southbendlathe@..., "Paul R. Hvidston"
<p.hvidston@i...> wrote:

jwtaylor,

Interesting idea, and I was considering using a 3-phase motor and

vari-drive

I could get for under $100. The problems are torque and price. At

lower

spindle speeds I'm not convinced that there will be enough torque to

machine

large workpieces using a vari-drive. Gear reductions should provide

more

torque than the flat belt can transmit w/o slip.

BTW, who is using flat belts (leather or other) on their lathe?

James Early

recommended (I believe) High-Speed Rubber Belts from McMaster-Carr,

page 827

for $0.26/inch pre-made. Any thoughts from anybody about that? I

called SBL

and they want over $100.00 for a 3/4" x 53" belt and cement kit.

Yikes!

Cheers!

Paul R. Hvidston
Upland, CA

----- Original Message -----
From: <jwtaylor61@h...>
To: <southbendlathe@...>
Sent: Tuesday, December 19, 2000 3:02 PM
Subject: [southbendlathe] Re: Headstock configuration and speed

range

discussion

Paul,

I checked with a local electrical supplier and there are a number

of

nice little AC frequency drive which will give you a variable

speed

control with any 110/220V AC motor. It will also give you

reversing

capablities and they are about $200- 300 dollars.

You can do away with all those counter shafts and jsut still with

one

speed.

I'll be looking forward to it! Thanks, Jim

Paul R. Hvidston, N6MGN@...
ACKSYS Engineering
Upland, CA
p.hvidston@...