Re: [CAD_CAM_EDM_DRO] part holding

On Thu Sep 2 20:50:35 2004 skykotech wrote:

>The hardest part about cnc is not the electronics, the servos, the
>ballscrews. The hardest part is holding down the friggen part! I
>just ruined yet another brand new 1/2" made-in-usa endmill when my
>program had a rapid that went .010 too close to a holddown clamp at
>120IPM. Doh! I wouldn't have had things so close to the clamps if
>it were not for the fact that I wanted to machine everything at once
>without remounting the part. How do you guys hold down a part when
>you want to machine 5 surfaces on it? Vacuum table? Glue? :-)
>
>Good thing Enco still has that free shipping going on...sigh

You could try old fashioned, "turners cement". Take 3 parts common resin, and
one part beeswax, heat slowly, stir well, and pour into stick molds. For use on
a mill, i'd use a flat piece of metal for clamping, rub the stick on it, heat
it, and press your work piece down on it till cool. To release it, hold a piece
of wood against the side, and give it a rap with a hammer. Holding power is
about 200 pounds per sq. inch.

For lathe work, say you wanted to turn some washers to exact thickness, you'd
want to rub a stick against the face plate, and hold the washers against it
until warm, and then just let go. Make a very gentle facing cut across the
washers, pop them loose, reverse, and reapply them to the face plate, and then
start facing them to thickness.

Bill

--
********************************************************************************
* *
RKBA! * Blessings on thee, oh Israel!!! * 4-19!
* *
********************************************************************************

An _EFFECTIVE_ | Insured by | All Matter is vibration. | Let he who hath no
weapon in every | by Colt; | --Max Planck | weapon, sell his
hand = Freedom | Dial | In the beginning was the | garment, and buy a
on every side!! | 1-911-A1 | Word. --The Holy Bible | sword. --Jesus Christ

********************************************************************************

Constitutional Government is dead! LONG LIVE THE CONSTITUTION!!!!!!

********************************************************************************