Delta 6x48 Sander Motors and Pulleys

Modified on 2025/01/27 14:48 by Jeff Joslin Categorized as Delta Pulley Sizes (partial), Electrical, Restoration Topics, Sanders

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==Motor Sizing==
From the 1936 "Delta 6" Belt Sander" publication [^http://vintagemachinery.org/pubs/detail.aspx?id=1873|Delta 6 inch Belt Sander]: ''"It is inadvisable to install less than a 1/2 h.p. motor in a unit of this size, and a 3/4 h.p. motor with double V-belt drive should be employed if very heavy sanding is to be done. Only a constant speed, repulsion-induction motor should be used.''" With the quality of modern V-belts, a single belt drive should be sufficient. Earlier motor horsepower ratings were more conservative than today, especially for repulsion-induction motors. Late model sanders were supplied with a 1.5 hp induction motor.[^http://owwm.org/viewtopic.php?t=16336|Delta 6x48 belt sander motor size]

See also updated & considerably-revised 1944 publication:<br>
[^http://vintagemachinery.org/pubs/detail.aspx?id=18098|PM-1514. 6 inch Abrasive Belt Finishing Machine Operating and Maintenance Instructions]



==Pulley Sizing==
From the 1936 "Delta 6" Belt Sander" publication [^http://vintagemachinery.org/pubs/detail.aspx?id=1873|Delta 6 inch Belt Sander]: "''With a 1725 r.p.m. motor, the pulley recommendations are 5 in. for the motor and 4 in. for the sander, giving a belt speed on 3100 feet per minute. This is a good all-around average for general work, and is as fast as the belt can be operated for woodworking without glazing or burning.''" For a 3450 rpm motor, simple math suggests a 2-1/2" pulley however the 1985 parts list calls for a 2-3/4" pulley. [^http://owwm.org/viewtopic.php?t=27788|6x48 sander gearing? Quick question!] Alternatively, the [http://vintagemachinery.org/math/sfpm.aspx|band saw calculator] may be used with Band Wheel Dia. set to 5.5 in. You are looking for a SFPM of 3,100. Any SFPM calculations must include the circumference (diameter*3.1417) of the drive drum. See attached spreadsheet.

See also updated & considerably-revised 1944 publication:<br>
[^http://vintagemachinery.org/pubs/detail.aspx?id=18098|PM-1514. 6 inch Abrasive Belt Finishing Machine Operating and Maintenance Instructions]



==Links==
* [http://vintagemachinery.org/math/sfpm.aspx|Band saw calculator]

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