Guessing Game Mk III : What Engineering Marvel is this.?

I will post another photo in the morning showing what it could be more clearly when I get to work and take some happy snaps of some of Grandads made from scratch stuff.
This mob usually figure it out in two minutes.
Ron

Complete guess - is it a valve spring compressor tool of some description?

No
Nothing to do with valves.

Is it part of a bearing puller or ball joint splitter?

a bearing puller/pusher?

Some sort of panel beaters tool ?

Nothing to do with pushing or pulling bearings.
Nothing to do with panel beating.
This other picture should make it a lot easier.
https://www.aulro.com/afvb/images/im...017/07/537.jpgDSCN0354 by john smith, on Flickr

There are some other small bits and pieces that goes with it.
The main part of it is there.

With most missing bits.
https://www.aulro.com/afvb/images/im...017/07/536.jpgDSCN0368 by john smith, on Flickr

Gran dads machines
The radial arm drill is in daily use.
Work safe made me place guards over the workings and gear box.
It is Two speed( plus multi vee belt pulley speeds) with a long quill stroke and can be swung around out wards and drill stuff straight from the floor.
I have seen this machine successfully bore out engine blocks using a fly cutter with the arms all locked up.
I have drilled 1 1/2 inch holes with it using tapered shank drill bits.
The wooden cabinet it sits on was also made by grandad.....remember he made the patterns for the castings.....so a cabinet would have been easy.
Be side it is a bench drill press(also in daily use), again patterns and casting, machining , metal hardening all done in house in the 1930s.
Most of the screws and bolts used were made in a turret lathe.

https://www.aulro.com/afvb/images/im...017/07/538.jpgDSCN0359 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/539.jpgDSCN0360 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/540.jpgDSCN0361 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/541.jpgDSCN0362 by john smith, on Flickr

The Yellow pedestal drill is another creation......not in use now....I have plenty of drill presses.
the Two pics of the smaller green drill press was a bench top one designed to do fine and small work.
The bearings work straight in the casting.......cast iron is suppose to be a better bearing than bronze.
That little machine has had much use over the years and the platform for it has many drill holes in it showing that, but the bearings are still wear free.
It was unusual in that the second Vee belt used in the drive of it was twisted though 90 degrees........it worked well...........I think some of this stuff was originally designed to work with overhead flat belts.
The vertical mill used the stand casting from his knitting machines.
It was set up to cut key ways........this machine is wear free and still gets used about twice a year.
https://www.aulro.com/afvb/images/im...017/07/542.jpgDSCN0363 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/543.jpgDSCN0364 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/544.jpgDSCN0365 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/545.jpgDSCN0366 by john smith, on Flickr
https://www.aulro.com/afvb/images/im...017/07/546.jpgDSCN0367 by john smith, on Flickr