View Full Version : How to hold soft jaws when boring

07-13-2007, 05:44 PM
Saw this in a flyer. A bit pricey. What do you clamp the jaws on when boring soft jaws?


07-13-2007, 05:55 PM
Find a bit in the scrap box about the right size, hold at the back of the jaws. A lot less expensive & does the job, does for a 'cut & fit' machinist like me !

07-13-2007, 08:22 PM
I use what I have called a spider for years, my grandfather and father showed it to me about 30+ years ago. Take a nut and drill and tap holes in it on 3 different flats, screw in a bolt. You can adjust the bolts in or out or remove any number you want to make it fit virtually anysize you need. I have 3 of them that will take me from about 1/2" to about 3" in diameter, they can be made bigger or smaller depending on your use.

07-13-2007, 09:24 PM
To do soft jaws you can 2 step them. Grab a bearing race at the back of the jaws and then move the race and bore the last little bit through the hole.

I am way too cheap to buy that thing.

07-14-2007, 12:15 AM
I use one of these: http://www.jawsandchucks.com/catalog/accessories_topjaw_forming_device.cfm

But then I paid $.99 for it on eBay (and $10 shipping).