My New Project

[SSpev]

Can you tell what it is? No not the head. Been working on it about 2 weeks. Just thought I would share a picture.

[JIMS409]

Nice Blasting Cabinet/Stand Tom! :clap

[CDNpontiac409guy]

Looks like a flow bench to me, Tom:clap

[jim_ss409]

Nice cylinder head display cabinet!:clap Okay, just kidding. I'm also going to guess that it's a flow bench.:deal

[SSpev]

Flow bench it is. Always wanted one.:D I still have to cut out an adjustable orifice plate, make monometers, and get the blowers. I started out wanting 1000 cfm. My money has dwindled a bit and I think I will have to settle for 400 cfm.

Blast cabnet..... that is in the future. I just can't decide how big to make it:scratch

[fourspeed409]

Tom
Where did you get the vacume motors? I have been thinking about building one also. I have some rather large vane style vacume pumps out of printing equipment but I dont know how to figure the CFM of them.
Shane

[SSpev]

This is the motor I plan to use. Started with 10, now I may be down to 4.

http://www.grainger.com/Grainger/wwg/itemDetailsRender.shtml?xi=xi&ItemId=1611634162&ccitem
I am not a fluid engineer but I can limp along.:dunno I will try to make it as simple as I can. ( I hope):doh
As for figuring flow of an unknown fan or blower. You have to have a flow bench... sorta. The fan has to be in a stucture, say a tube, with an inlet and outlet. Measure the pressure, in and out, at spacific points in the tube. Go here and use this

http://www.efunda.com/formulae/fluids/calc_orifice_flowmeter.cfm

to calculate cfs then convert to cfm. You can then use this formula to find free flow cfm.


vol flow act = vol flow std x 14.7 psia/(Actual Abs Atmo Prs + gage prs) x (Temp + 460deg)/520 deg


To much:scratch :bang I have to do some looking. I'm not sure this works. It's been 12 years sence I have done this.

The easy way is to do a flow bench
http://www.ag.auburn.edu/users/gparmer/articles/flowbench2/