Needs Pictures: 0
Results 1 to 11 of 11
-
12th May 2020, 01:30 PM #1Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Posts
- 89
3HP Dual-Bag vs 2HP Single-Bag + Cyclone - System Choice
Got some great advice on placement, now working out which model.
It seems that 3HP single bag systems are not common.
Just a weekend woodworker, not particularly concerned with frequency of emptying. Mainly just looking for effectiveness and whether the addition of a cyclone is worth the suction loss.
Will the most effective system for me be a 3HP, dual-bag system or a 2HP single-bag + cyclone?
I would rather not have the footprint of the dual bag + cyclone. Interested to hear whether this is necessary despite the footprint and which of the 2 other options would suit me better.
Shop will include a tablesaw, jointer, planer, bandsaw, belt grinder mostly. 8m x 6m.
Example:
Option 1: W329 - DC-7 Dust Collector | Hare & Forbes Machineryhouse
Option 2: W394 - DC-3 Dust Collector | Hare & Forbes Machineryhouse and W316 - CDS-2/3 Cyclone Dust Separator | Hare & Forbes Machineryhouse
-
12th May 2020 01:30 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
14th May 2020, 11:32 AM #2GOLD MEMBER
- Join Date
- Mar 2018
- Location
- Sydney
- Posts
- 1,166
a bit of reading here in the dust extraction forum will clearly show for fine dust collection, CFM is king. Everyone will suggest you go the DC-7 and expand it to 6" inlets and expand machine ports to 6" as well.
-
14th May 2020, 11:48 AM #3Member
- Join Date
- Jul 2016
- Location
- Melbourne
- Posts
- 89
Thanks for that. Yes that seems a good summary.
Thinking the DC-7 with 1-micron pleated filters is the way to go, to get that 3HP. Think I can fit it
-
14th May 2020, 01:54 PM #4Taking a break
- Join Date
- Aug 2008
- Location
- Melbourne
- Age
- 34
- Posts
- 6,127
More air = more better.
2hp isn't really enough to run a cyclone anyway, too much flow loss.
-
14th May 2020, 04:00 PM #5.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,756
Just a heads up that the impellers on the DC7 and DC3 are the same size and rotate at the same RPM so nominally pull the same amount of air.
Just the 3 V 2 HP doesn't really make a difference to the flow although under load (full flow) the 3HP will be able to work harder and can handle higher currents and so won't slip as much but this is not much of an issue.
The reason the 3HP is used on the bigger machine and why it has a better flow is due to the two usually bigger filter bags. These significantly reduce the back pressure so more air can flow and this requires a bigger motor. If a 2HP is used on a twin 2 bag machine it may draw too much current and overheat and die.
If you add a cyclone to either a DC3 or 7 the cyclone will dominate the back pressure and the two bag factor won't be as significant.
-
26th July 2020, 01:05 PM #6
So is the W316 any value in a system? I used to have a home made Thein baffle in line that I retired to free up space in the workshop a while ago. I noticed the increase in flow taking it out of the system, but conversely the ease of emptying bags side of the scale took a big hit and the dusty impeller has also take a few hits as well since taking out the preseparator. I'm about to move houses and rethinking dust collection. Do you think a W316 would loose more or less airflow than a Thein Baffle?
Franklin
-
26th July 2020, 08:19 PM #7Senior Member
- Join Date
- Nov 2016
- Location
- USA, Indiana, West Lafayette
- Posts
- 188
The cyclone will cause less flow loss than a cyclone. A Super Dust Deputy has about one third the pressure drop of a tophat style (side entry) Thein .5 m diameter with 125mm inlet. The W316 probably has slightly less pressure loss than the SDD. You didn't describe your implementation but Thein baffle pressure loss will vary inversely with the fourth power of scale factor (just like everything else). A top entry has more loss due to the sharp ninety at the entrance.
How much the pressure loss affects flow depends upon the rest of your system, i.e., where you are operating on the pressure vs flow curve.
The DC-7 with a W316 would likely have about the same airflow performance as a DC-3 by itself.Dave
-
26th July 2020, 08:34 PM #8
Here's a link with a pic of my Thein implementation. It would appear then that the W316 could be a substantial upgrade at a commensurate cost.
Franklin
-
26th July 2020, 09:15 PM #9GOLD MEMBER
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 2,621
-
26th July 2020, 09:24 PM #10Senior Member
- Join Date
- Nov 2016
- Location
- USA, Indiana, West Lafayette
- Posts
- 188
It certainly does appear that way. Just be sure you use something bigger than 100 mm hose between the cyclone and fan (and everywhere else).
If you've been following this thread then you know I'm not a big fan of leaving a redundant centrifugal separator in the system. A cyclone should be used as a part of a system, not just an add-on.
Panorama.jpgDave
-
26th July 2020, 11:05 PM #11GOLD MEMBER
- Join Date
- Nov 2007
- Location
- melbourne australia
- Posts
- 2,621
Hey, one of those is mine!
Similar Threads
-
bargin cyclone system
By Gaza in forum DUST EXTRACTIONReplies: 3Last Post: 14th July 2011, 10:36 PM -
A Dyson Dual Cyclone Dust Extractor
By Turbulance in forum DUST EXTRACTIONReplies: 5Last Post: 29th September 2010, 02:13 PM -
How to make my Dual Cyclone - Dust Extractor
By Turbulance in forum DUST EXTRACTIONReplies: 17Last Post: 22nd November 2008, 08:38 AM -
Choice of vacuum to power mini-cyclone
By John G in forum DUST EXTRACTIONReplies: 2Last Post: 6th September 2006, 12:44 PM -
Single vs Dual cyclone dust collector
By BarryBurgess in forum TRITON / GMCReplies: 6Last Post: 1st April 2005, 07:58 AM