When using vibration, be sure to use a sturdy (e.g, motor casing stock
and liner tube) to support the casting tube, if you're using liner and
casting tubes. Casting tubes may split along the seam under vibration.
DAMHIKT. :-(
I don't know whether sedimentation is significant if one vibrates for a
fairly short time---a few minutes. There does occur a layer of cured
"rubber" on the top of the tube.
Best -- terry
On 1/29/2020 12:04 PM, William Claybaugh wrote:
Anthony:--
Thanks.
I’m thinking of a shaker table on to which the mixing bowl would be placed during post-mixing vacuum processing. It seems likely it would need to be nailed down for use but otherwise portable; a cart mount with heavy duty tie downs seems possible for field processing.
I am familiar w/ the concrete “snake” vibrators (building reinforced concrete water wells in North Africa) which also seem possible but strike me as likely too messy and possibly too dangerous.
How does dual frequency work? On in each direction on a table?
Understand about gradients, that’s why I would do this before casting.
Bill
On Wed, Jan 29, 2020 at 10:43 AM Anthony Cesaroni <anthony@xxxxxxxxxxx <mailto:anthony@xxxxxxxxxxx>> wrote:
A combined magnetostrictive/piezo electric driver using 2
frequencies works well for this as well mixing BTW. Wilcoxin makes
those drivers for dynamic shakers and I have one setup in the lab.
A large shaker table works really well but they are heavy and
expensive to move around. I’ve never seen one with explosion proof
electrics either so a barrier would be required.
My guess is you don’t have access to equipment like that but they
do make some relatively inexpensive air driven, ball or piston
type vibrators that you can attach to a container directly. They
also make tables that have them integrated. The tables float on
air cushions. You can change the pressure to the motor and
cushions to achieve the frequency and displacement you desire. An
accelerometer and a scope to read it is nice to have as well.
That being said, it’s easy to end up with solid loading gradients
if you don’t characterize the process right.
Good luck.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>> *On Behalf Of *William
Claybaugh
*Sent:* Wednesday, January 29, 2020 12:26 PM
*To:* arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
*Subject:* [AR] Vibratory compaction
Anyone have experience w/ vibratory compaction if solid rocket
propellant, with or without vacuum?
Initial search did not turn up anything specific....
Bill
