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deltaenterprizes
01-23-2009, 01:49 PM
What procedure would you use for truing a cube in a mill ? I have read it before but can't remember it.

dp
01-23-2009, 01:54 PM
Here's a nice writeup on making a turner's cube:

http://www.cnccookbook.com/CCTurnersCube.html

Mcgyver
01-23-2009, 06:01 PM
Here's a nice writeup on making a turner's cube:

http://www.cnccookbook.com/CCTurnersCube.html

delta, do you mean a turners cube, or just how to square something up?

imo that shown in the link isn't a turners cube; may be cube made by a turner or even someone named Turner, but a turners cube has the cube(s) inside detached, quite a bit trickier to make and a lot trickier to figure out how if you haven't been shown the trick (or read lautards book)

nheng
01-23-2009, 07:20 PM
Here's one of several very nice MIT videos on milling. This one squares a block. Couple of things to remember, always put the clean cut face against the fixed jaw and if the piece has a rough face against the moving jaw, put a short piece of mild steel or aluminum round that has the ends tapered somewhat to concentrate the grip on the center of the part so it does not tilt in when the vise is closed.

That and tap the part down with a lead or other soft mallet each time you close the vise to reseat it after the jaws lift it a little. Den

http://techtv.mit.edu/videos/143-machine-shop-6

Spin Doctor
01-23-2009, 07:37 PM
When squaring blocks in the mill I much rather prefer to use one hold down between the movable jaw and the stock. It forces the stock up tight to the back jaw and down at the same

timehttp://catalog.starrett.com/catalog/catalog/groupf.asp?GroupID=3In reality they are pretty simple to make so there is no need to enrich the gnomes of Athol. As to getting the ends squre to all four sides after facing the last side take a side mill cut on one of the ends and use that as you register surface. Another option is to clamp the block into an angle plate in two directions.

Teenage_Machinist
01-23-2009, 10:45 PM
Squaring all sides of a block is a bit of a problem. A Versa-Lock style vise or a screwless vise could help if turned on it's side.

deltaenterprizes
01-23-2009, 10:59 PM
Thanks nheng! That is what I was looking for!

dp
01-23-2009, 11:18 PM
delta, do you mean a turners cube, or just how to square something up?

imo that shown in the link isn't a turners cube; may be cube made by a turner or even someone named Turner, but a turners cube has the cube(s) inside detached, quite a bit trickier to make and a lot trickier to figure out how if you haven't been shown the trick (or read lautards book)

I agree - it's just squaring up the initial cube which was the original request. Let's yell at Bob to get one finished! :)

Teenage_Machinist
01-24-2009, 02:52 PM
It's called a Turners cube I think because it is turned (bored) on a lathe, with the 4 jaw chuck. Traditionally.

Today impressive non-round versions can be CNCd.

Frankly I think a versalock style or large screwless vise would be a useful tool, though not a tough heavy milling workholder. They can do operations difficult with the more common type.