If no-one comes up with measurements for you, do you have a manual for it?

There is one here:

http://www.lkctraining.co.uk/S2-CentreLathe/M300%20manual.pdf

and the same one here:

http://vintagemachinery.org/pubs/detail.aspx?id=13849

Print out the exploded isometric drawing of the TT attachment and scale off the size of the parts you do not have using one of the parts you do have as a reference.

There is a good photo of one here that you can use for scaling:

https://www.traceymachinery.co.uk/product-page/harrison-m300-taper-turning-attachment

Edited By DC31k on 19/04/2021 20:10:41

Len

I'm not sure that the lock bar and bed clamp can be made sufficiently accurately for proper functioning by scaling from drawings or photographs.

Easy, shake free, movement of the dovetail slides is essential if this type of taper turning attachment is to work well. Any misalignment of the lock bar will interfere with free movement. It doesn't take much to make results somewhat unpredictable.

SouthBend used to assemble their version on the machine by fitting the lock bar to the attachment first and passing the free end though and oversize hole in the bed bracket. The hole was then filled in situ with white metal or babbit to cast the bar in place ensuring perfect alignment once everything had cooled down.

Not exactly practical in the home workshop but you will need to make provision for similarly precise, fine adjustment on your version. Small shifts in offset and rotation in both horizontal and vertical axes will need to be handled. Perhaps a shake free ball joint on a bracket with clamp adjustment both ways?

Yet another example of something relatively simple when you have everything worked out on original drawings turning into a total PIA when you have to get things just so with only the host machine to work from.

Clive

Len

The bar on my machine is 19mm diameter x 320mm long.

Hope that helps.

Pete