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Black Forest
12-02-2010, 10:50 AM
I need to build a small vice that will center the workpiece when tightened.

The maximum opening just over 2".

I cannot figure out how to do it simply. I have figured out ways to do it but it becomes to bulky.

This will be used as part of an attachment for my belt grinder to round the ends of material. The vice will sit on a cross slide type of mechanism in order to feed the workpiece to the belt as the rounding process progresses.

The reason is so I don't have to drill a hole in every piece I want to round the end. The pivot will be under the workpiece.

Robin R
12-02-2010, 10:59 AM
I have a self centering bar vice, so what you are looking for is made. I don't think it would be all that straightforward to make, so you might be better off just buying one. You should perhaps try a search on ebay, you might well be able to pick one up at a decent pice.

Black_Moons
12-02-2010, 11:00 AM
Make a threaded rod thats half left hand and half right hand threads

aboard_epsilon
12-02-2010, 11:14 AM
Self centreing

here is a recently completed project ..Well... part of it .

from looking at it , it should tell you how i got this door drilling jig to be self centreing ..and may give you an idea how to make a unique vise .

http://img.photobucket.com/albums/v190/aboard_epsilon/P1010163.jpg

http://img.photobucket.com/albums/v190/aboard_epsilon/P1010164.jpg

anyone finding photobucket very clunky ..its gone to pot .

all the best.markj

Toolguy
12-02-2010, 11:15 AM
You make a groove in the middle of the right and left threaded rod and a stationary U section in the base or hold the rod from moving at the ends. Once you get it all together, get the closed jaws centered on the pivot point and dowel pin the base with jaws centered.

Robin R
12-02-2010, 11:28 AM
Here's an example of a commercial one, I would think you could pick up a used one for a lot less if you are patient. http://www.shars.com/products/view/52/quotSelfCenteringquot_Milling_Machine_Vise

Davidhcnc
12-02-2010, 11:53 AM
Another possibility for a self centering vice is a 4 jaw scroll chuck with two jaws removed....although that is absolutely no use for your job!

jep24601
12-02-2010, 12:06 PM
Here's an example of a commercial one, I would think you could pick up a used one for a lot less if you are patient. http://www.shars.com/products/view/52/quotSelfCenteringquot_Milling_Machine_Vise
That seems to be a pretty reasonable price.

HAP
12-02-2010, 12:17 PM
BF,
I went throught the same drill wanting/looking to build my own centering vise. After much frustration, I found this one and made the purchase. It's quite a nice little vise, much better than what I was trying to make.

http://www.grizzly.com/products/Precision-Self-Centering-Vise/H7576
Regards,
HAP

Black Forest
12-02-2010, 12:59 PM
I made a PDF of what I want to build......but I can not upload a pdf to Photobucket. Any ideas how I can let you all see this PDF?

Black Forest
12-02-2010, 01:02 PM
That vise from Grizzly might work!

maweis
12-02-2010, 01:05 PM
wood working folks use a small self centering vise for
drilling pen blanks before turning. search for Penn State Industies
or any of the stores that sell pen turning kits and supplies

Mark

macona
12-02-2010, 01:51 PM
Self centreing

here is a recently completed project ..Well... part of it .

from looking at it , it should tell you how i got this door drilling jig to be self centreing ..and may give you an idea how to make a unique vise .

http://img.photobucket.com/albums/v190/aboard_epsilon/P1010163.jpg

http://img.photobucket.com/albums/v190/aboard_epsilon/P1010164.jpg

anyone finding photobucket very clunky ..its gone to pot .

all the best.markj

Thats why I switched to flickr. It creates BB code for the size of pic you want to post.

GKman
12-02-2010, 04:44 PM
A brace and bit type drill uses one up to 1/2" but I never paid any attention to how it worked.

oldtiffie
12-02-2010, 05:25 PM
I made a PDF of what I want to build......but I can not upload a pdf to Photobucket. Any ideas how I can let you all see this PDF?

Either out-put the original file to *.jpg or scan the hard-copy of the *.Pdf file and out-put that as a *.jpg file.

Then up-load the jpg file to Photo-Bucket as usual.

Black Forest
12-03-2010, 01:46 AM
Thanks Tiffe, but I made an animated PDF to show you all what I wanted to build.

darryl
12-03-2010, 03:04 AM
A Jorgensen clamp uses two threaded rods, each with both left and right hand threads. One clamp gives you two right hand nuts and two left hand nuts, plus the 'leadscrews'. Maybe not enough clamping power, but the option exists to build a vise with two screws, geared together at one end, or coupled with a toothed belt. That would free up the center portion so you could drill right through without hitting the screw.

The Jorgensen clamps I've seen lately sure look like crap, though.

Ian B
12-03-2010, 06:22 AM
How about something like this:

http://cgi.ebay.co.uk/HBM-100MM-SUPER-PRECISION-SELF-CENTERING-VICE-/290451747743?pt=LH_DefaultDomain_3&hash=item43a045f39f

Left & right hand threads, one set of vise ways, 2 moving jaws.

Ian