Re: Lathe horizontal drive motor and pulleys

glenn brooks <brooks.glenn@...>

I have a couple of lathes with these three speed countershaft pulley’s: a SB 9x48” and and an old 1919 7x36” Dalton.  If you run grooved automotive flat belts on the pulley’s you won’t have any trouble. The countershaft pulley’s are all made with a slight crown that aides in self centering.  The only v belt I use connects the drive motor pulley with the large counter shaft drive pulley.

Glenn B.

On Dec 10, 2020, at 9:37 PM, Milan Trcka <milan.v.trcka@...> wrote:

I confirm (on my 9A) that the flat countershaft pulley makes changing speeds much easier (almost pleasant). I also find that the V belt needs to be quite accurate and straight otherwise it wanders side to side and tends to rub on one side. This happens especially when the belt is cold. I had to "file" the belt sides to straighten its tracking. Countershaft alignment is also important.

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