Using Jacobs style chuck for workholding
Is it considered acceptable to hold work
with a Jacobs style chuck. Specifically, is it ok to put a piece of drill rod stock in the chuck, mount the chuck in a rotary table and then make cuts on the stock with my mill? |
Jim Stewart wrote:
Is it considered acceptable to hold work with a Jacobs style chuck. Specifically, is it ok to put a piece of drill rod stock in the chuck, mount the chuck in a rotary table and then make cuts on the stock with my mill? Usually not a good idea. The taper does not take side loads well and can come loose. I saw one if my bosses try to mill a part with and endmill in a drill chuck once, got about 1/4" before it fell off :-) If you have some other way to hold the chuck other than by the tapers, it might work. If its a thread-on chuck you have to watch which direction you are milling or you could wind the chuck off of the arbor. There are some inexpensive collet chucks available for 5-c collets. They work horizontally or vertically and are easilly attached to a rotary table. http://busybeetools.ca/cgi-bin/pictu...6&NTITEM=B1963 |
On Fri, 14 Jan 2005 23:56:37 GMT, machineman
wrote: Jim Stewart wrote: Is it considered acceptable to hold work with a Jacobs style chuck. Specifically, is it ok to put a piece of drill rod stock in the chuck, mount the chuck in a rotary table and then make cuts on the stock with my mill? Usually not a good idea. The taper does not take side loads well and can come loose. I saw one if my bosses try to mill a part with and endmill in a drill chuck once, got about 1/4" before it fell off :-) If you have some other way to hold the chuck other than by the tapers, it might work. If its a thread-on chuck you have to watch which direction you are milling or you could wind the chuck off of the arbor. There are some inexpensive collet chucks available for 5-c collets. They work horizontally or vertically and are easilly attached to a rotary table. http://busybeetools.ca/cgi-bin/pictu...6&NTITEM=B1963 The only sort of work holding a Jacobs chuck is good for, it to hold various socket head capscrews, set screws, rod stock and HSS lathe tooling when using a grinder or belt sander for variously shortening or grinding so you dont burn your fingers. I do this regularly with an old chinese 5/8 drill chuck that has a buggered up taper. Keeps from burning your fingers nicely Gunner "At the core of liberalism is the spoiled child - miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke |
All times are GMT +1. The time now is 11:06 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 DIYbanter