RE: [hobbicast] Was:So, anyone CAST anything lately Now TV Suggestion
- A friend had a low cost hydraulic press and a low cost air over
hydraulic jack that he was going to marry up so he could make the
press work a bit quicker with less work. I've thought that this set
up might be a good substitute for a jolt squeeze machine for smaller
flasks that could serve double duty as a press.
At 05:23 PM 3/4/2009, you wrote:
>I put a steel bar on top of the molds to prevent cope floating and pouredDick Morris
>the metal. No flask needed during pouring! Good castings, and NO SAND
- A hydraulic press would probably be even better then my arbor press. Less
work, which is my objective.
How hard to pack the sand seems to be a quantitative value in industry, but
a qualitative factor in hobby casting. Sand hardness is measured by how far
a steel ball is pressed into sand by a a spring with the amount of
depression measured by a dial indicator. It would be interesting to see a
home shop designed hardness tester that could be correlated to industrial
standards. From pictures, I have seen, that the amount of pressure is
reasonable. But I don't know what that amount is.
Two interesting points I observed was first, the jolt step was
really important. Industry uses a sand delivery system that delivers
'fluffed' sand. I used window screen to run the sand through to be sure
there were no clumps. The jolt step really leveled the sand in the flask.
Second point is the lack of need for flasks while pouring the metal.
There was a minor amount of flash, but no more then I normally get. I have
always been under the impression that each mold needed a flask when pouring.
There is the process of using jumping flasks where a tapered flask is move
from mold to mold when pouring. However, if the mold is weighted, then no
flask may be needed. Interesting possibilities for experimenting.
Dennis in Houston
> -----Original Message-----
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> Sent: Wednesday, March 04, 2009 9:48 PM
> To: email@example.com
> Subject: RE: [hobbicast] Was:So, anyone CAST anything lately Now TV
> A friend had a low cost hydraulic press and a low cost air over
> hydraulic jack that he was going to marry up so he could make the
> press work a bit quicker with less work. I've thought that this set
> up might be a good substitute for a jolt squeeze machine for smaller
> flasks that could serve double duty as a press.
> At 05:23 PM 3/4/2009, you wrote:
> >I put a steel bar on top of the molds to prevent cope floating and poured
> >the metal. No flask needed during pouring! Good castings, and NO SAND
> Dick Morris
> Anchorage, Alaska
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- I a gauge were fitted to the hydraulic side of the jack, it would be
easy to get repeatable, and hopefully predictable results.
Here is a bench top press that might work, although the stroke is a
bit short at 6-1/2".
At 07:17 PM 3/4/2009, you wrote:
>A hydraulic press would probably be even better then my arbor press. LessDick Morris
>work, which is my objective.
>How hard to pack the sand seems to be a quantitative value in industry, but
>a qualitative factor in hobby casting.
I saw that very same episode & marvelled at how fast the employee (which showed Mike how to make up the mold) was. Of course, when you are paid by the piece, you do become very fast at what you do over time - but this guy FLEW through the process!
I have been giving some thought to trying this myself - but I've had two bad habits to support get in the way - namely, eating and sleeping under a roof. LOL
Seriously, how many tries did it take before you arrived at a consistent method/feel for the pressure confidence? Does this method perform well enough to consider giving up "normal" pounding of the cope & drag (for small parts anyway)?
Thanks for the info!
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