Smart and brown model M mk2 belt tension question

[julianf]

Eventually got around to getting the spindle back on my lathe today. Its this model -

Inside the left hand door is the motor. I cant work out the belt tensioner. This is a photo of the tensioner on my unit -

...at least i think thats it!

The handle tilts back the motor to take the tension off the belt for fitting, and the thing at the top of that contraption, i think, sets how far the motor goes back.

The paperwork says something like "single bolt" for tensioning, but has no diagram of exactly what bolt.

Ive tried slackening off that one pointing to about 10 oclock in the photo, and then turning the larger hear at 90 degrees to it, but that does not seem to do much, so i feel like im entirely not understanding it at all!

Could someone please advise?

Thank you.

 

[Agroshield]

The part going from the clock centre to about 1 on the clock face looks like it slides in the casting. The middle of it is relieved and you can see dimples on it from the bolt at 10 o'clock pressing on it.

I think that part should be lower in the casting and maybe is in compression rather than tension*. The face of the nut contacts the casting, rotate the nut to alter the projection of the threaded bit above and then tighten the 10 o'clock bolt to stop any vibration altering the setting.

* If it were in tension, the only thing stopping it popping upwards is the 10 o'clock bolt and that is not a very positive retaining mechanism in that application.

Apropos nothing, I wonder if anyone has every painted an actual lathe in the way shown in the line art at the top - all white with black pinstripes and highlights.

 

[julianf]

...still not got this sorted, if anyone has any other suggestions?

 

[julianf]

...still not got this sorted, if anyone has any other suggestions?

Scrap that, I've just been out there again, and it was as @Agroshield said, i just couldn't get it clear without looking again at it!

The large "cylinder" with the hex on the top of it passes through the cast iron, and will spin in it, pushing more or less thread out of the top.
The small bolt should locate in the recess that's was, in the photo, way too high (you shouldn't be able to see it as it should be in the casting)