fuller davey FTD125 Ideal Pressure

Hi! I have a fuller davey FTD125. The blades of the rotor were bad, we made the replacemnt of aluminum bars. The pressure raise fast until 50 psi and gets stuck. Could you tell me what i'm doing wrong? Thanks

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Jul 19, 2017
Re: number 4
by: Doug in s.d.ca.

I'm not sure that any of those blades are actually for your unit, so maybe the thickness should have been left as-was. On the length, does the 9 inch extend the full length of the rotor? And is that what the originals were?

Anyway, I think I'd try making a set with the original dimensions of the old blades, plus that extra 1/16 for the bore-out. And yes, maybe a tenth on the length as well - that's gotta be some leakage there.

I think that's about as good as it'll get.

Jul 18, 2017
Summary
by: Chris

1.- When the compressor starts is a little bit noisy, but in around 10 sec later the sound got smoother. I think this is ok.

2.- Using your info, the blades were set at 0.183".

3.- Yes, we got the oil and change the diaphragm.

4.- In this point, the lenght of the baldes was 9" long. I don't know if that 0.112 affects the operation of the compressor.

5.- All the gaskets were replaced and we pay extra atention in case that a leak of oil appears but never happens.

The thing is that before the compressor go down, the fill rate of the tank was around 6-7 minutes at 120 psi. But now the fill rate is 10 min at 100 psi. I mean the compressor works fine, no noise at all but it's not as efficient as it used to be.

Jul 18, 2017
Summary
by: Doug in s.d.ca.

So, now it's running quiet? And is the thickness of your blades the same as the originals? And you now have the correct oil and the diaphragm fixed?

How about the length of the blades? Are your gaskets such that the ends are reasonably tight and not dragging on the ends?

Jul 16, 2017
Old blades
by: Chris

When we bought it the compressor was making a lot of noise. So we change the rotor bearings, air and oil filter also the oil. But the diaphragm wasn't good. When the compressor reach the pressure, a fountain of oil happens through the air filter. We add the oil that was throw it away. We don't check that wasn't the same type of oil and when we realize, the blades were deteriorated along the chamber of the cylinder. After that moment we decided to turn the cylinder to have a clean chamber without the scratches that was made by the oil and the blades.

Jul 16, 2017
Well, this doesn't look promising
by: Doug in s.d.ca.

Here's an extract of the part descriptions I found


BLADE,ROTOR,COMPRESSOR,0.183X1.25X9.112

BLADE,ROTOR,COMPRESSOR,0.246X1.812X10.48

BLADE,ROTOR,COMPRESSOR,0.1835X1.25X7.987

BLADE,ROTOR,COMPRESSOR,0.246X1.812X6.987

BLADE,ROTOR,COMPRESSOR,0.308X2.190X5.730

BLADE,ROTOR,COMPRESSOR,0.308X2.190X8.480

BLADE,ROTOR,COMPRESSOR,0.183X1.25X10.987

BLADE,ROTOR,COMPRESSOR,0.308X2.190X6.320

BLADE,ROTOR,COMPRESSOR,0.183X1.25X10.987

BLADE,ROTOR,COMPRESSOR,0.308X2.190X6.320

There appear to be dupes, but I suppose they are different materials.

What is wrong with the old blades? Can they be turned over, or have they already been?

Jul 15, 2017
Blade thickness
by: Chris

The original blades have 0.1875" of thick.

Jul 15, 2017
vane thickness
by: Doug in s.d.ca.

I've come across a parts list that covers several models - if you give the width of the slots in yours, I may be able to match that up with a vane thickness for the stock part. Although the thickness of the old vanes would probably be pretty close...along the the other two dimensions.

It's by part numbers only, so don't know which vane belongs to which model.

Jul 13, 2017
chamber
by: Doug in s.d.ca.

Are you saying that you didn't get to 100 psi until after you had the chamber turned?

If that's the case, maybe your blades are scored or notched from the previous attempt(s). Maybe just run it a while and see if it wears in.

Jul 12, 2017
fuller davey FTD125 Ideal Pressure
by: Chris

Also I remember that the cylinder was scratched inside, so we take it to a machine shop to turn the chamber. The diameter of the chamber was like 1/16" bigger. This affects to the loading time? Do I need to make the rotor 1/16" bigger? Thanks

Jul 12, 2017
Thickness
by: Doug in s.d.ca.

Hard to say.

It should be less than a press fit, and the thermal expansion of the blade needs to be accounted for.


Jul 11, 2017
Compressors
by: Chris

Finally we were able to have the tank at 100 psi. It takes around 10 minutes to load. We exchange all the gaskets in the compressor too but we believe that should load faster. How loose need to be the thickness from blade to fit in the rotor? Thanks

Jun 22, 2017
Blades
by: Doug in s.d.ca.

Not really, because I don't know what you did, exactly.

They may be a bit too small, in any dimension.

With a pressure load, they may be sticking in the rotor, losing contact.

And probably some other stuff, but those would be the main things, aside from leaky gaskets.

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