Blocks, or a bar that fits in a table slot is good for getting
alignment/setup close.. but table slots will wear with repeated
(dis)mountings.

Hold-downs should be adequately strong and well tightened to absolutely
insure that the workholding device won't move untentionally.. not just held
in place from the "that looks secure" perspective.

The clamps shown appear to be fabricated from angle iron, which is generally
thin for the overall size of commonly available sizes. Thicker cross
sections can be found in angle with large dimensions, not so much with
smaller dimensions.

It appears that the items which were referred to could be suitable/reliable
for only light duty milling.. anything larger would very likely require much
more subtantial thicknesses in material.. and more material relative to the
size of the slot.

It's the width of the slot size that makes those suggested clamps (look)
weak, IMO.. removing 1/2 of the material seems very counterintuitive to me.

I try to keep the hold-down bolts (with a heavy washer under the nut) close
to the side of the workholding device, whether the bar/clamp have a slot, or
just a hole.. this is generally easier when blocks are placed on the
other/outer side of the bolt.

--
WB
..........


"Bob La Londe" wrote in message
...
Seems simple... How do you think It will work out?

http://www.instructables.com/image/F...The-design.jpg

or here if the picture won't show by itself.

http://www.instructables.com/id/maki...lling-machine/

Obviously adjust the dimensions to match your application. Is there
something better that might make it easier to square and repeat alignment
upon removal and remounting of the vise? The only think I can think of is
to mount an alignment bar on the bottom of the vise that will drop in the
table t-slots.