Thost truck transmission mods were pretty popular back in the day
as the kids say . I always wondered if there was a article in a
old,old Popular Mechanics or like mag showing the mod .
animal
On 10/13/24 3:19 PM, Rick Swineford
wrote:
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Just
to throw another thought in the discussion.? I inherited a
1922 15¡±.? It came converted to top mounted 4 spd truck
transmission driven by the original motor.? It has twin
v-belts from the motor to the transmission input and twin
v-belts to the step pulley, 2nd from the
headstock.? Under very heavy loads the belts will walk off
the step pulley (working on a collar to stop that) but it
also adds a little safety.? I mounted a magnetic pickup on
the change gear end of the headstock shaft and connected a
digital tach.? Top rpm is 988.? I am attaching the speed
chart and photo of setup.
Rick
Swineford
?
?
??? I think the top speed for my 9A was 1000 RPM . Pretty
sure ya can set limits on the VFD .
animal
On 10/13/24 11:24 AM, Rick wrote:
On Sun, Oct 13, 2024 at 01:16 PM, Ron
Goodger wrote:
Well, I have decided against
eliminating the step pulleys.? It would be much
more complicated than just replacing the motor and
installing the VFD.? Then I will have full options
available as to power.? With the VFD and three
phase motor I will easily be able to overspeed the
lathe.? Does anyone know what the physical speed
limits of the lathe mechanism is?? At his point, I
see no reason to ever do so.? Just wondering.
?
?
My concern is the plain bearings in the
headstock. I don't run either my SB9A or my SB13 much
above the listed top speed of either lathe.
