Kuzma Stabi

[_Scotty_]

Here are some pictures of the Gast pump and the pulsation dampers as well as TT.
I can't get the images from my gallery to the thread.
Gast Pump http://www.audionervosa.com/MGalleryItem.php?id=930
Pulsation dampers http://www.audionervosa.com/MGalleryItem.php?id=931
Maplenoll TT http://www.audionervosa.com/MGalleryItem.php?id=934

See my gallery http://www.audionervosa.com/index.php?action=mgallery;sa=album;id=99
Maplenoll TT
Scotty

[richidoo]

Neeto! Thanks Scotty. I learn something everytime you post. The accumulators are awesome, like giant pneumatic capacitors

I was just reading about that Gast pump DAA series, their biggest diaphragm pump.
http://www.gastmfg.com/pdf/diaphragm/specsht/daa.pdf
It can make 60+psi at the small flow you need. What is the operating pressure of your arm?

btw, To post pics in the thread you have to use the "Direct Link"
on this page http://www.audionervosa.com/index.php?action=mgallery;sa=item;id=934

[tmazz]

Here are some pictures of the Gast pump and the pulsation dampers as well as TT.
I can't get the images from my gallery to the thread.
Gast Pump http://www.audionervosa.com/MGalleryItem.php?id=930
Pulsation dampers http://www.audionervosa.com/MGalleryItem.php?id=931
Maplenoll TT http://www.audionervosa.com/MGalleryItem.php?id=934

See my gallery http://www.audionervosa.com/index.php?action=mgallery;sa=album;id=99
Maplenoll TT
Scotty

Nice job Scotty. I was just about to make a post describing how a friend of mine built an air system for his ET2 arm that used a storage tank to smooth out the micro flexes in pressure caused by running the air pump while you are playing the table, but I see not only have you already done it, you used a much nicer grade of equipment than he did.

[_Scotty_]

I admit to going for the badass approach on this project. Exactamundo, Rich.
They are the air equivalent of capacitors.
I run the arm at 22psi and the platter at 4psi.
If the air pressure is too high on the platter bearing the platter will wobble on the air cushion because escaping air volume is too high and the film between the bearing surfaces is too thick.
 Essentially your air bearing on the platter is only stable within a narrow range of pressures + or - about 1psi.
The GAST is overkill but I didn't want to leave anything on the table to regret not doing in the future. The diaphragms are also rated to last 20 years. That's what I call a durable good.
I bought this particular beast based on my experience with a single diaphragm version that I used in a lab configured as a vacuum pump.
Scotty

[richidoo]

So you must be regulating the pressure to each load after the accumulators?

Where did you buy your pump? I want a model 15D1150-102-101 for my diy RCM, thanks

edit: I think Grainger has them

[_Scotty_]

The pressure is regulated at the pump before the accumulators and the filter. In order to use a regulator you have to allow somewhere for the excess pressure to go which means you must have an adjustable blow off valve ahead of the regulator. The pump puts out over 60 psi and it has been regulated down to 25psi..
If the regulators were after the accumulators then the accumulators would see +60psi which would exceed the pressure rating of the flat bottoms and top caps and would require domed covers which meet schedule 40 pressure specs like pipe the body of the accumulators are made from.
The regulator is set for about 26psi. These things are not very precise mechanisms,(ie,they are not laboratory grade).
 Pressure is monitored via in-line low pressure gauges which give a more accurate reading of the pressure supplied to the arm and platter than the regulator. These are the parts I am using to construct an air dryer for the system. The dryer is consists of an under-sink water filter housing that will hold over a quart of reusable color indicating desiccant.
 I purchased my pump from Isaacs Fluid Power Equipment
Westerville OH. Ph. 614-895-8540
This may not be the place to find lowest price on the pump you want. I would beat the bushes for sure to find the best price.
I don't know how to re-size the image will web-site do this.
Scotty

[richidoo]

Thanks Scotty.