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Milling Table "fault"

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Nick Hulme04/08/2018 17:22:35
750 forum posts
37 photos
Posted by anthony smith 4 on 04/08/2018 09:53:35:

HI ROGER LOOKING AT YOUR PHOTO OF MILL THE HEAD IS TILTING TO FRONT OF THE MACHINE I WOULD SHIM THE FRONT OF THE COLUMN WITH A FOUR THOU SHIM MOUNT THE DTI IN THE CHUCK

AND CHECK AGAIN THIS WILL TELL YOU IF YOU HAVE TO INCREASE THE SHIM OR SHIM THE REAR OF THE COLUMN CASTING

Unless the head lifts as the Y traverses this will make

NO DIFFERENCE AT ALL!

:D

Roger Williams 204/08/2018 17:41:23
340 forum posts
1 photos

Hello all, Im taking it to pieces tomorrow. The reason Ive come across this error now is because Ive always assumed every thing tobe correct, until I measured a piece I had machined for accuracy and was shocked. The DTI base is clamped under the head, rigidly too. Ive reasoned that if the column, which is bolted up solid, were at 45 degrees to the vertical, it wouldnt make any difference. Unlikely I know !.

The mill is in supeb condition, and not really over used. I did most of my machining using a Jones and Shipman vice (stupidly sold!!!) which is probably why I havent noticed anything . All the later work ona vice machined from castings by me, which is out on it sliding surface by this 10 thou .

Anyway , everybodys advice is much appreciated. Thanks.

SillyOldDuffer04/08/2018 19:56:48
Moderator
7897 forum posts
1725 photos
Posted by Nick Hulme on 04/08/2018 17:22:35:
Posted by anthony smith 4 on 04/08/2018 09:53:35:
...

Unless the head lifts as the Y traverses this will make

NO DIFFERENCE AT ALL!

...

Nice one Nick, I've been educated.

My earlier point was about the risk of misunderstanding measurements. How ironic that it was me who was confused. (Again)

blush

Dave

Ian Hewson04/08/2018 21:32:03
314 forum posts
25 photos

Reground the surface of my magnetic table by mounting the head of my quorn in the spindle of the mill and taking small cuts, came out ok.

I.M. OUTAHERE05/08/2018 00:48:11
1468 forum posts
3 photos

Also check that the table surface is ground flat , sit your parallel on it and shine a light behind to see if there any gaps

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