Using a metal cutting burr with a router...?

[Clive S]

I really am sorry that you found my replies in the build log dismissive and impolite. I can assure you I did not mean to come over that way. Sometimes my mode of discussion is a little, shall we say challenging! But it's meant in good humour and despite what you may think I have taken on board everything that has been said.

Ok seeing that you are not so abrasive.

I cut a slot in my table about 4mm deep


and the table twisted by about 2mm with the stress being relieved then I had to take it to engineering place to have it trued up and the top skimmed.

So beware as I did not expect that to happen.

[noyloj]

I cut a slot in my table about 4mm deep

and the table twisted by about 2mm with the stress being relieved then I had to take it to engineering place to have it trued up and the top skimmed.

So beware as I did not expect that to happen.

Yes 3-4mm was about what I'd imagined, I would have though that would be safe!.. bugger for your table what a pain!

It's a crazy thought probably but what if I was to try and relieve the stress before milling out the groove?

[noyloj]

Ok seeing that you are not so abrasive.

I cut a slot in my table about 4mm deep


and the table twisted by about 2mm with the stress being relieved then I had to take it to engineering place to have it trued up and the top skimmed.

So beware as I did not expect that to happen.

Perhaps this resource could be useful...

STRESS RELIEF OF GRAY CAST IRON


dtic.mil/cgi-bin/GetTRDoc?AD=AD0620556 · PDF file


I don't know how to insert links so go easy on me....

[mekanik]

http://www.dtic.mil/dtic/tr/fulltext/u2/620556.pdf

[noyloj]

Yes that's the kiddy!

Probably not the right place to ask but...

1. is that the same link?

2. how did you post it?

3. how do I add attachments and photos?

[John S]

Warco WM14 you can usually get away without having to machine the underside of the table.

Warco WM16 is borderline some clear, some don't.

Warco WM18 you always have to machine the table.

The problem comes about from droop when casting as they are cast top up.
The longer the table, the slower it cools and gives rise to the middle dropping down under the weight of the metal.

There are ways when casting to prevent this but seeing as it's not their remit to make sure they can convert to CNC then they don't bother.
There is enough standard clearance for the manual ACME screws.

[noyloj]

Warco WM14 you can usually get away without having to machine the underside of the table.

Warco WM16 is borderline some clear, some don't.

So maybe no machining needed...

....wouldn't it be simpler/safer if necessary to mill the groove in the saddle and drop the x axis screw supports by slotting the mounting holes to get upwards/ downwards clearance? Or is this not possible for some reason I can't see. (I'm working off a plan at the moment my mill should be here next week according to Warco.)

Perhaps simpler to remake the x axis ballscrew supports with lowered bearing housings and at the same time incorporate motor mounts or standoffs...

[noyloj]

And thinking about the metal de stressing it is probably quite as likely to give rise to deformation as cutting unless some way could be figured to hold the casting in shape whilst heating/cooling... beyond my home scope I think...

[mekanik]

Just went to the web page copied the address and pasted it,not put many attachments into posts but think it's in the tools menu .
Mike