Oscillating Spindle Sanders

Can someone please tell me how the Oscillating mechanism in a vertical axis Spindle Sander works ? < Example >

... is it some sort of Swash-Plate arrangement ?

I have a useful-looking motor, removed from a Garden Shredder.

Thanks

MichaelG.

Here is one answer

Edited By Michael Gilligan on 13/08/2012 06:40:09

Michael

Just had a quick look at the exploded diagram in the manual you linked to. The reciprocating drive for the spindle is, I think, fairly straightforward (if I am correct that is   ) and is derived by use of a worm gear on the motor shaft driving a reciprocating crank which moves a keyed sleeved up and down on the motor shaft to which the sanding drum is connected.

I more detail;

The motor shaft has a worm gear (15) fitted which drives gear (30), this gear is fixed on shaft (35) which drives the connecting spindle (28) via the connecting rod (18). This reciprocating motion is coupled to the spindle seat (22) which houses the spindle (60) and couples to the sanding drum . The drive from the motor to the spindle is made by use of a long key (12) held by a set screw (13) over which the spindle seat (22) and spindle are free to slide, a fairly crude spline.

The only thing which is not clear from the diagram is the coupling of the reciprocating motion to the spindle seat. This could easily be acieved using a couple of links coupled between the connecting rod ends and the spindle seat.

Cheers

Martin

Edited By Martin W on 13/08/2012 10:29:39

Edited By Martin W on 13/08/2012 10:37:15

Edited By Martin W on 13/08/2012 10:42:23

Martin,

Thanks for the very useful reply.

I must confess, I hadn't really looked at that manual when I made my original posting. ... I just linked to it instead of the catalogue picture.   [06:27 is a bit early in the morning for me these days]

MichaelG.

Edited By Michael Gilligan on 13/08/2012 13:22:24