I use either one of these (80mm) mostly on the SX2.7 and KX3CNC or this K4 on the X3 though mine came from Chronos . The ARC one has no measurable lift, a small amount on the K4 so needs knocking down.

1mm does sound rather excessive can you post a picture of your setup as there may be something obvious that is not right such as the piece of rod should be against the moving jaw.

It looks the right setup.

But 0.1mm lean on a fixed jaw that is say 30mm high should only result in 0.2- 0.3mm over the 3″ workpiece not 1mm?

What is the moving jaw like? may be worth just swapping them round if it is OK and see what sort of cut you get then you would know it is just the jaw and not the surface the jaw fixes to adding to the problem.

is it possible to check the jaw and also it’s mounting face with your square resting on the mill table? may need to swing the vice round length ways to do it

You need to get a DTI involved and do some readings to see if the fixed jaw/work is square to the table. What error do you get running a clock up and down the actual work rear face?

Tony

With the tilt to the jaw that your square is showing I would expect the first picture to be showing light under the square at the front of the machine as the angle (if the cut is horizontal) will be less than 90deg.

As Tony says if you have a dti mount it on the head and raise that up and down to read difference between top & bottom of the jaw. Then front to back across a freshly flycut surface. That way the angles an dgas can be confirmed with a bit of trig.

I assume you are moving the table side to side to make the cut.

Greetings, I recently purchased from Warco a DH2 vice, which is very versatile, wide jaw opening, and beautify made. Have a look at the specification.  It is also very accurate.  Although expensive, I think it is well worth having, and there is 15% off at the moment.

Just a thought.

regards

Brian B

Hi David, looks to be the same one that I bought from RDG, some while ago. The base may not be square to the jaws, and the best way I find to check it. is with a piece of flat plate in the jaws, long enough to extend past the vice, and then use a square off the table, I’ve used a piece of gauge plate in the photo below, and mine seems to be OK, and I’ve not had any issues with with it when used, but if yours is bad, I would suggest you contact RDG for a replacement or a refund.

Regards Nick.

You have a large mass of iron overhanging the front of the mill table. If there is any slack in the dovetails it may lift the far side of the table. Try rotating the vice 90° on the table and see what happens. Try putting a dti on the near edge of the table and see if you can lift it with the vice hanging off it. Look at the back of the table to see if there is a gap between the table and the saddle or between the saddle and the base.

Martin C