Blower Motor

[Mr Mike Mills]

I am looking at up grading my exhaust on my Versa Laser 6.60

If I use this blower
http://www.pennstateind.com/store/DC250SEMB.html

Which has 6" port on the blowing end.

If Immediately I narrowed that down to 4"

what will that do to the CFM, and Static Pressure.

The other unit i was looking at was
http://www.pennstateind.com/store/DC3XX.html

but I do have to have 2 4" hoses going into the suction end of the blower

Thanks Mike

[Dan Hintz]

It won't do anything to the SP (within reason), but it will kill your CFM (by around half)...

[Greg Bednar]

Why not just get one of these from your local "China Depot" ?
http://www.harborfreight.com/13-gall...tor-31810.html

It's four inch so no stepping down from six, cheaper, and it's pretty quiet.

[Joe Hillmann]

Why not just get one of these from your local "China Depot" ?
http://www.harborfreight.com/13-gall...tor-31810.html

It's four inch so no stepping down from six, cheaper, and it's pretty quiet.

That one is only 660 cfm. The other one he linked to was 1300 or so. Of course harbor freight has a 1350 cfm dust collector for $200 which you could buy and throw away everything but the blower and still come out ahead.

[Greg Bednar]

That one is only 660 cfm. The other one he linked to was 1300 or so.<snip>

Mine passes the poor mans static test very well. Put a piece of 8.5x11 sheet of paper against the slots in the front door and it will stay there. It will also stay there with a piece of 8.5x11 cardboard. In short, it sucks hard; and that's a good thing.

I sometimes question the mfg's stated claims on CFM in either the plus or minus direction. The proof of pudding is ..........

[Doug Novic]

I have the same unit from Harbor Fright. Works great. Heavy cutting and engraving on a piece of junk plywood and the smoke is gone instantly. That's how I tested it (the pudding tastes good too). My only complaint is the noise. After six hours I need to get out. Now I am building a structure outside the window to house the blower... problem solved.

[Mike Chan]

Not sure if this helps, but just for reference, I'm running this http://www.pennstateind.com/store/DC3XX.html, with the blower placed right at the bottom of the Trotec Speedy 300 (80W), then venting straight up through the warehouse ceiling, which is 16' straight up. This is with 4" hard galvanized piping from home depot. Flow is perfect. This is also a good article to read through: http://www.engraversjournal.com/arti...780/index.html

[Mikah Barnett]

Recently referred to me on this forum - I will likely be going this route for the time being. 1550 CFM claimed - who knows what it actually is, but I'm sure it's more than I've got right now.

http://www.harborfreight.com/2-hp-in...tor-97869.html

[Dan Hintz]

Sure, 1550 CFM... what they fail to tell you is that measurement is at 0" H2O. Add in some static pressure that all systems have (say, a measly 6"), and it drops to a more pokey 6-800 CFM (educated guess on that flow rate, but gets the point across).

[Mark Ross]

That blower is the one that came with our Epilog 36EXTS and they told us in no uncertain terms NOT to reduce it. Its powerful enough that when we put a piece of full size material on our vector grid, it sucks it down into place and you have to turn the blower off if you need to remove the material. IMHO, having such a powerful blower also reduces our fire risk from flare ups...that and a good powerful air assist.

[Dave Sheldrake]

having such a powerful blower also reduces our fire risk from flare ups

They do indeed Mark, the flipside is if a fire does catch they make it series very quickly.

Dan's right, efficiency is the game, no amount of power will make up for a poorly designed flow dynamic.A 75 watt Fantronix inline 550 cfm at the machines exhaust will pull more air than a 2HP 1600 cfm dust extractor will 15 feet away via a duct.

Main thing to remember is, fans on Chinese machines operate via cross flow extraction, not down draft , using huge blowers on Chinese machines can end with the top window collapsing if you get even minor amounts into negative cabinet pressure.

cheers

Dave