centering ect on mill

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timeone:
Its not a circle eg tube im doing so lathe is not possible

im cutting both id and od the id is a complete circle where as the outer will have a lug sticling out ill saw cut through this as it will the bit i put a bolt through to clamp it

abit like this but one piece
http://www.allproducts.com/metal/daizan/02-l.jpg

BillTodd:
Centre the rotary table and spindle first: If you don't need any super precision you can just do it with a cone shaped something in the chuck, else fix the DTI to the rotary table (ro-tab) and indicate the round part of a end mill in the chuck while rotating the ro-tab. Zero your dials. (see: http://madmodder.net/index.php?topic=3776.msg41242#msg41242)

Without moving the X,Y or the head, centre the work-piece on the table using a pointy thing (parallel lathe centre) in the chuck, or a DTI mounted on a bar hanging off of the chuck rotating by hand around a reference on the work-piece.

I would fix the work-piece so you can do most of the work on the outside of the piece first - you will probably have to clamp around the outside so will have to move at least one clamp during the process (always keep the piece clamped by at least two clamps, while you move one of the other clamps - will will soon find out your ro-tab is not big enough - they never are)

Before you start cutting the inside, recheck that the piece is centred by moving your X & Y back to zero, with the afore mentioned pointy thing in the chuck. Then rotating the ro-tab to check it remains under the point.

Cut or bore the inside as required.

Bill

DaveH:
Jason,

Ok I understand. First align the centre of rotation of your RT to the Zaxis (do you know how to do that)? Using X and Y axis.

After the RT is aligned you will then need to lign up the centre of the 50 and 55 circles to the Z axis (which is allready aligned to your RT). Don't touch the X and Y handles.

Move your work piece untill the centre is aligned with the Z axis then clamp the work piece in place.

You may to check whilst clamping.

Have you followed this. Come back and ask Jason if it is not very clear.

:beer:
DaveH

timeone:
Thanks Guys
I think ive got that ok
Not to bad off space wise as my rotary table is 8inch so the part only takes a small part of it but ill do as you say and make sure its bolted down well.
I need to pay more attention to centering things up as i now realise there is a lot of it in milling work
the mill ive got is an oldy but still pretty good and works well. and will do most things i need it for. im not that jenned up on milling infact im only just getting the hang of a lathe again, after more than 35 years still its good fun

andyf:
What a nice looking mill!
I see it has a barcode on the base. Was it a cheapo from Aldi or a posh one from Waitrose? :)

Andy

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