what are these tools please ?

[richard]

years ago i bought a large collection of mainly 1950's German tools and some of them i have never even worked out what they are . can someone tell me what they are i presume it will be obvious - but not to me     

[Jonathan Poll]

years ago i bought a large collection of mainly 1950's German tools and some of them i have never even worked out what they are . can someone tell me what they are i presume it will be obvious - but not to me     

Look like some sort of kickstart tools. Probably not from a micro.

JP

[richard]

no jonathon the're not micro tools at all they are tools to be used in a power drill - but what do they do ?

[AndrewG]

Is that a stone on the central shaft?  Does the outer shell move separately?

I'm leading up to asking if they are valve seat regrinding tools for very small valves.  Though what the outer shell with the dog gear is doing, I've no idea.

Then again, they could be spurgetting tools.  Now does anyone know what spurgetting is?

[Rusty Chrome (Malcolm Parker)]

I think they're more general than valve seat regrinding tools but along the same lines, they look like they're probably some kind of internal burnishing tool. Presuming the internal part rotates seperately from the outer. The outer being a guide piece to allow you to line up accurately. Either that or off-sided spurgetting modules for broaching willets. 

[Chris Thomas]

Dear Richard

It is difficult to get a feel for what sixe they are in the photograph, They could be huge or small. But I think they are for grinding out spot welds.

The central pin is located in the centre of the spot weld and the out cutting piece rotates and cuts through the spot weld

I am probably totally off beam.

Chris Thomas

[richard]

now theres a thought - will look at this tomorrow chris . they vary between roughly 1/2 " AND 1"