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Thread: 2hp DE Build
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15th February 2020, 05:05 PM #76GOLD MEMBER
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OK. Here are the numbers I came up with. If I'm correct the cyclone is more restrictive than the flexi.
power.png
Definitely going to do that. They are very exposed at the moment.
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15th February 2020 05:05 PM # ADSGoogle Adsense Advertisement
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17th February 2020, 04:56 PM #77GOLD MEMBER
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I now need to open up my TS dust port to 125mm. There's insufficient space to enlarge the blade shroud outlet to 125mm due to the lack of clearance between the shroud and the cabinet side when the blade is tilted to 45 degrees. So my plan is to split the 125mm into two 100mm ducts with a Y piece. One 100mm flexi duct will go to the blade shroud and the other to a BMH in the cabinet to grab some of the fine dust the shroud misses.
Ezi-duct want $153 to make a 125-100-100 Y piece. That seems a little excessive. I reckon I can bodge something up with sheetmetal. It won't be pretty, but if I can mount it inside the cabinet that won't matter. I should be able to fit the Y piece inside the cabinet, but it is tight in there thanks to the spindle moulder motor. If it wont fit, I will have to locate the Y piece outside the cabinet and run a second 100mm duct through the wall of the cabinet (probably through the access door).
I'd welcome any feedback or better ideas.
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17th February 2020, 05:36 PM #78.
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The blade shroud looks so constricted it will end up sucking very little anything because the air will find it much easier to go the other route. If that is the case you might consider removing the blade shroud completely.
I'm not sure what to advise with your DC system, but if you had 6" ducting and beefier DC I would just plumb the 6" direct to the cabinet using BMH like this
Improving machine cabinet dust ports
BMHs work better fitted flush to the side of a cabinet rather than hanging out in the breeze like you show with your (not really BMH shape) scoops on the end of the flex
Something like this C or D will work - of course it requires opening up the port in your cabinet AND cutting holes for vents elsewhere in the opposite wall of the cabinet - not everyone is prepared to do this.
Screen Shot 2020-02-17 at 2.25.51 pm.png
Maybe you could leave the blade shroud fitted and remove the flex and then fit a "slide" from the end of the shroud to close to the BMH - anything loose that falls off the end of the slide near the vicinity BMH is gonna be grabbed like a frog tongue grabs a fly.
This is lathe dust collection which is why its hanging out in the breeze.
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17th February 2020, 07:59 PM #79GOLD MEMBER
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I think it's more substantial than it looks. It actually catches a lot of the heavier sawdust. Even with the flexi disconnected from the cabinet the blade throws a lot of sawdust out the 100mm port onto the floor. I reckon it's worth keeping.
Mmmm, well I don't. That setup would probably work well, but but the spindle moulder motor in mine prevents me from fitting a floor in the cabinet to catch the sawdust. A lot would just end up on the floor under the cabinet.
OK. That means fitting the Y piece outside the cabinet. I would have to mount the BMH in the access door. That could work.
I'm not sure if that would work with the blade tilt. Would need to be a large BMH. I'll have a look if that's feasible tomorrow. It would certainly make the plumbing easy.
Thanks for the advice.
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17th February 2020, 08:41 PM #80GOLD MEMBER
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Being lazy, I've been looking for a pre-made BMH. It seems they are also known as 'velocity stacks' when fitted to turbo inlets. What are you thoughts on these Bob?
White Comms Bell Mouth Coupling 100mm from Reece
Orange PVC electrical & comms sweep bends of all sizes and types
Universal 3" /3.5"/ 4" Velocity Stack For Cold Engine Air Intake /Turb – Adlerspeed
Black Aluminium 100mm Bellmouth - Trumpet - End Cap - Air Inlet Funnel | Ramair Filters
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17th February 2020, 09:00 PM #81.
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Well they are all 100 mm and the only one that seems to have close to the correct radius of curvature is the Adler speed but that won't sit flush with the inside of the cabinet.
Given you have 6" ducting unless you're going to use 3 x 100mm ducts in parallel I wouldn't use a BMH <150mm.
If you have a lathe you can make you own - look up bell mouth hoods on the forum
or
Improving machine cabinet dust ports
I seem to recall seeing 150 mm ones for sale somewhere one line - maybe keep looking?
OR for a fee I can make them for you - but unfortunately there is a serious gotcha.
I currently have a broken ankle so can't start making any for 4 weeks
I might have a spare in my shed but my one working foot is so sore I can't even go down the back stairs to look in the shed at the moment.
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17th February 2020, 09:17 PM #82GOLD MEMBER
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17th February 2020, 09:50 PM #83GOLD MEMBER
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17th February 2020, 11:01 PM #84.
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Make sure the 150 is the ID of the duct and not the flared end.
The width of the flared end should be at least 150+150/2 = 225 mm
Anyway if it is a true 150 mm BMH that's much cheaper than I charge
btw BMHs are really effective on most machine cabinets and for any “naked” duct termination like lathes and drill presses, so you will (eventually) many more than one. Bandsaws can use 3 x 100mm BMHs.
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18th February 2020, 02:08 AM #85GOLD MEMBER
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Speaker ports are another source of bell mouth although the 6" ones are harder to find. Might not be as heavy as the conduit ones you found.
Pete
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18th February 2020, 07:13 AM #86GOLD MEMBER
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Will do.
I found a 125-125-125 Y connector at Carbatec for $18. They also have 125-100 reducers for $10. That's a lot cheaper than a $153 metal Y connector from Ezi-duct. So I've come up with version 3 of my design. It keeps the original 100mm duct to the blade shroud and runs a 125mm flexi to a BMH mounted in the cabinet access door. That gives most airflow to the BMH. Do you think it will starve the blade shroud too much?
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18th February 2020, 09:41 AM #87.
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Probably but it’s worth a try.
what will starve the other flex is lack of air inlets in the cabinet.Narrow slots and small hole are still very restrictive. If this is all that is being relied on, those openings should add up in area to about 4x the area of the slots and holes. If a vent is installed it should be ~2x the X area of the flex.
It’s all a bit chicken and egg as venting the cabinet will then pull more air from the cabinet but less air from the shroud. ☹️
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18th February 2020, 12:38 PM #88GOLD MEMBER
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18th February 2020, 01:18 PM #89.
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