Banged up Jungner US-2305 table

[pertooth]

I've become the owner of an old abused Jungner US 2305.

It came originally from a place where it seems the operators liked adjusting the swivel table with a sledge hammer.
It also seems like they used incorrect t-nuts for fixturing as well as overtightened these.







The abuse seems to beyond the raised areas have resulted in a bow in the table. I measure 0.1mm convex in the long direction.

I assume this us from the hammering and general abuse in the t-slot.

I have proceeded to file and stone the dings but there are still raised areas.

Considering if I should rescrape the bottom and regrind the table in situ on the machine.

Stroke is not long enough but i think I can reposition to reach all of it.

Another option is to drag it to work and surface grind it there.

This is probably the better idea.

The questions is what will happen with the bow when re-grinding the top.

If stress us released with grinding then maybe that should be operation one.


The area under the swivel table seems rather undamaged and appears to be paralell with x and y.

Any considerations and recommendations or tips would be welcome.

 

[Richard King]

Many times grinder table top get work hardened. Did you by chance stone and check the bottom before scraping the top? If not I suspect if you checked it now the bottom will swivel in the middle. if it does, while on you granite plate use a height gage with a 0.1 mm indicator on the top of the extreme end and then press down on the other end. a PM member who lives in Oslo Norway has taken several of my classes I taught in Scandinavia, Jan Sverre Haugjord and (I forgot his name fellow in southern Sweden can tell you where you can get it ground. You can set the scraped side on the magnetic chuck, kiss the bottom, and then flip it over and grind the top, so it looks original.

 

[Richard King]

 

[Richard King]

I didn't know it was going on You tube and I was being silly at first..lol

 

[Richard King]

https://www.youtube.com/@jansverrehaugjord9934

 

[pertooth]

I have not scraped on it yet. Hoping the bow will be lessened after grinding the abused side. Took 30um off today. Still possible to see some marks but all the high points are gone.

Managed to get some grind burns but will have a go at it tomorrow again.