Posted by John Griessen on May 14, 1999 at 18:02:10:

In Reply to: vibrating table posted by M. Markham on May 08, 1999 at 11:40:32:

Thinking laterally, vibrating is essential, the table is not....

So, consider using a method borrowed from concrete

poured foundations for buildings. They use a

vibrating eccentric weight to send shock waves into

the liquid slurry to make it more liquid, and dislodge

bubbles by cavitation or at least compressing/expanding

them some. If their scale is right for you, just buy one.

I made one the right scale for investment casting debubbling

from a Weedeater crossed with a Waring Blendor, (of course,

this has absolutely nothing to do with my style of art).

The end of the flex

shaft of the weedeater had a hole in it that I tapped to

receive the threaded end of the Waring motor shaft. The

weedeater business end I modified with a welded on

eccentric weight small enough

to stay within the aluminum bearing housing, then covered

all with a PVC hose and copper end cap with inner tube

and band clamp for good measure.

I drive this motor vibrator combo with about 50 Volts

DC for the right speed to shake bubbles while working

it down between burnoutables and mold

cannister. The fluidizing effect of the vibration allows

much easier motion than without, so my burnoutables

float out of the investment--you need your

other hand free to guide them as you guide the

vibratool. That means a foot switch. So far, I have

found the constant 50 Volt speed seems enough--I use an

on/off foot switch. A variable speed might have value.

I use a Molex connector and a special cable I made to

plug into my 50 Volt DC kiln area power(I use that

voltage for safety reasons to drive all motors in

the area of the kiln, furnace, and crucible tongs).

• VIBRATOOL

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