Boring Out Jaws

[zanellan]

Hi, this is my first post and i would like some help. Could someone please go through the basic steps of boring out soft jaws on a CNC machine please. All help will be gladly welcomed!

[Geof]

Did you try searching using your title as a search string? This has been discussed a few times. Briefly it is a case of have your jaws held at the approximate mid point of their travel in a manner that loads the jaws in the same way they will be loaded in use. One way to do this is put tight fitting pins in the counterbore on the outer bolts and have a ring that is gripped by these pins acting as jaws. The ring has to be of the correct diameter so that the jaws are midway in their travel as I mentioned. It is possible to buy adjustable rings, actually they are more like a three lobed cam, to get the correct size.

Then bore the jaws to a thou or two smaller than the stock you will be gripping (inches of course, I guess for metric it would be a hundredth of so smaller).

[LeeWay]

Here is an image of the type ring Geof described.
http://cgi.ebay.com/12-BORING-RING-C...QQcmdZViewItem