From: David (SEETHESUNRISE) [#1]
2 Aug
To: ALL
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Hi everyone!
After speaking with a couple of reps at Epilog and reviewing some threads on here I know I am looking for a compressor with about 30psi for the air assist.
I asked about CFM and they suggested about 2 CFM, but they don't feel the CFM is really that important for the engraver. I was looking at various air brush compressors and most compressors I have seen have less than 1 CFM. If you are using an airbrush compressor have a low CFM and still work fine?
A couple of other things I am looking at...I want to also use this at swapmeets. So the compressor needs to be quiet.
Do you have any suggestions for the specs I would be looking for in a compressor that could run at times for 5-10 minutes with little break in between and still be quiet?
Thank you for any assistance.
David
From: scroller (JEFF) [#2]
2 Aug
To: David (SEETHESUNRISE) [#1] 2 Aug
Hi David,
I use a small Gast oiless compressor which runs continuously and it is very quiet. I have seen them on eBay used fairly inexpensive.
From: David (SEETHESUNRISE) [#3]
2 Aug
To: scroller (JEFF) [#2] 2 Aug
Thanks Jeff. What is the model you are using so I can take a look?
From: scroller (JEFF) [#4]
2 Aug
To: David (SEETHESUNRISE) [#3] 2 Aug
Hi David,Mine says it is a DOA-P709-AA and that it is 4.2 amps. It is probably discontinued now. It is simular to the one here:and here is a product page:Hope this helps, Jeff.
EDITED: 2 Aug by JEFF
From: Pedaler (ROYBREWER) [#5]
2 Aug
To: David (SEETHESUNRISE) [#1] 3 Aug
David,
CFM is typically a measure of vacuum and therefore not really relevant for our purposes.
PSI is more applicable. If you try to run much more than about 40psi, you might damage the "plumbing" in your laser. 20-30 PSI gives the desired effect using the small hose through which it is vented.
Any of the Gast (probably other brand names too, but Gast I know) diaphragm pumps should be quiet enough for a kiosk.
From: bluepaw [#6]
2 Aug
To: ALL
I got a little air brush compressor from Hobby Lobby. It is a Silentair brand and I think Scorpion is the model.
Rated at 40 psi it seems to work fine. It is fairly quiet and although it gets a bit warm it does not cut off and I have run it for as much as 40 minutes.
The price was about $144.00.
I already had one that I use on my airbrush but the duty cycle on it was about 10 min on and 10 off. That was not acceptable for the laser.
Bill
From: David (SEETHESUNRISE) [#7]
3 Aug
To: Pedaler (ROYBREWER) [#5] 3 Aug
Thanks Roy. That helps alot. I have found plenty of the smaller air compressors that provided the psi, but the cfm wasn't up to par...usually around .6-.7
Since it's not as important my options now open. Now, that I have found out more about when to use the compressor I probably won't need it as often as I thought, but will still need it.
If you are looking for more details, kindly visit kapa.
Thanks,
David
From: David (SEETHESUNRISE) [#8]
3 Aug
To: bluepaw [#6] 3 Aug
Thanks for the info. Do you know the model? They show the Scorpion I and the I-C are 40psi.
Thanks,
David
From: JHayes55 [#9]
3 Aug
To: David (SEETHESUNRISE) [#8] 3 Aug
David
I run an Epilog 32x20 75 watt - the Gast compressor is model #DOA-P172-AA - Gast number is 616-926-
Web site is www.gastmfg.com. They have a web page you click on a map to get a list of dealers in you neck of the woods.
This model Gast is quite and was what was recomended for my laser.
Has been trouble free for years.
Good luck.
From: bluepaw [#10]
3 Aug
To: David (SEETHESUNRISE) [#8] 3 Aug
its the scorpion 1
From: Harvey only (HARVEY-ONLY) [#11]
28 Sep
To: David (SEETHESUNRISE) [#1] 28 Sep
The CFM is quite important. If it is rated at 1 CFM, (Cubic Feet per Minute), and 30 PSI it will not deliver that pressure when attempting to deliver the higher CFM.
If you use a higher PSI compressor or a considerably higher CFM be sure to have a regulator after the compressor so the pressure does not get too high.
If I remember correctly, very long time since I needed it 30 years, the pressure will drop to the cube of the over-volume. That means that if you attempt to draw twice the CFM from the system you will end up with 1/8 the pressure. The ratings on the compressors are the max possible. Be careful that the CFM is at the delivery pressure. Sometimes they give you the maximums for each, but not together. [It can be the same problem with exhaust systems for lasers.]
Simpler words: It may be able to deliver 30 PSI at .1 CFM, OR 5 PSI at 2 CFM, not both. Most manufacturers will state CFM @ PSI, that is what to go by.
From: RALLYGUY (RALLYGUY1) [#12]
29 Sep
To: Harvey only (HARVEY-ONLY) [#11] 29 Sep
Hi Harvey,
The higher the (PSI) pounds per square inch, the more difficult it is for a compressor to show good (CFM) Cubic Feet per Minute performance. Many of the lower cost compressors are rated with high CFM but only at lower operating pressures. One needs to compare both numbers and understand that when the PSI rating drops that it is easier to show higher CFM numbers, giving the illusion of better performance. Granted it all depends on what operating pressure you will be using in your application...and an air assist may not need to be operating at 80-90 PSI.
But for really comparing compressor performance, you should try to check ratings all at the same PSI. This will give you a better view of actual performance by then showing the variable at the CFM numbers, as you mentioned in your example.
Brian G.
EDITED: 29 Sep by RALLYGUY1
I bought this item as it was the correctly specified Air Assist unit for my Creality Falcon CR 10w Laser Engraver. I assumed that as Creality were selling it on Amazon for use in the UK that it would have been ether dual voltage or OK to use i the UK. When it was delivered, I seen that the rating lable on the unit was Max Voltage of 125v. so obviously not intended to be used in the UK so why did they send it.
I had a chat with Amazon customer services and after quite a discussion, I ended up buying a USA to UK adaptor to give it a try just incase it was actually dual voltage.
It actually runs quite well for short runs but I feel it is getting hotter than it should be and on longer run times its cuts out as its obviously overheating so I am assuming its not meant to be used in the UK. Short 15 min runs it still gets hot but it has coped with, just, but I need it to run longer than that at times and it trips out.
Whilst Anazon were happy enough to accept this for return and refund, because it came from USA it was going to be more trouble than it was worth for me to return it. Unlike a normal UK amazon return, returning this to the USA had to be paid for and posted by me and refunded by Amazon when they got it back in the USA.
The other option was to get an Amazon lable printed but I had to drop the parcel of at a UPS drop off point myself and that just wasnt convenient for me being a pensioner to travel and arrange this so I ended up keeping it and using the bits for spares for use with another pump I bought to replace the genuine Creality one.
I still dont think Creality should have sent it over to the UK if it wasnt suitable for use over here.
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